13 files changed, 723 insertions, 414 deletions

diff --git a/src/main/java/ftbsc/lll/proxies/AbstractProxy.java b/src/main/java/ftbsc/lll/proxies/AbstractProxy.java
index 4c57e20..ff320f0 100644
--- a/src/main/java/ftbsc/lll/proxies/AbstractProxy.java
+++ b/src/main/java/ftbsc/lll/proxies/AbstractProxy.java
@@ -1,68 +1,71 @@
 package ftbsc.lll.proxies;
 
 import java.lang.reflect.Modifier;
+import org.objectweb.asm.Type;
 
 /**
- * Abstract proxy class, implementing common aspects
- * of {@link MethodProxy} and {@link FieldProxy}.
+ * Abstract proxy class, implementing common aspects.
  * @since 0.3.0
  */
 public abstract class AbstractProxy {
 
 	/**
-	 * The name of the corresponding class member.
+	 * Which type of proxy this is.
 	 */
-	private final String name;
+	public final ProxyType proxyType;
 
 	/**
-	 * The fully qualified name (i.e. java.lang.String) of
-	 * the parent class.
+	 * The name of the corresponding element.
 	 */
-	private final String parent;
+	public final String name;
 
 	/**
-	 * The modifiers of the member, as a packed int.
-	 * @see java.lang.reflect.Modifier
+	 * The descriptor for this element.
 	 */
-	private final int modifiers;
+	public final String descriptor;
 
 	/**
-	 * @return the name of the item
+	 * The fully qualified name (i.e. java.lang.String) of
+	 * the parent class.
 	 */
-	public String getName() {
-		return this.name;
-	}
+	public final QualifiableProxy parent;
 
 	/**
-	 * @return the modifiers of the member, as a packed int
+	 * The modifiers of the member, as a packed int
 	 * @see Modifier
 	 */
-	public int getModifiers() {
-		return this.modifiers;
-	}
-
-	/**
-	 * @return the fully qualified name of the parent class
-	 */
-	public String getParent() {
-		return this.parent;
-	}
-
-	/**
-	 * @return the descriptor of the member
-	 */
-	public abstract String getDescriptor();
+	public final int modifiers;
 
 	/**
 	 * The private constructor, should be called by all classes extending this in theirs.
-	 * @param name the name of the member
+	 * @param name the name of the element
+	 * @param descriptor the descriptor for the element
 	 * @param modifiers the modifiers, as a packed int
 	 * @param parent the FQN of the parent class
+	 * @param proxyType the {@link ProxyType} being represented here
 	 */
-	protected AbstractProxy(String name, int modifiers, String parent) {
+	protected AbstractProxy(String name, String descriptor, int modifiers, QualifiableProxy parent, ProxyType proxyType) {
 		this.name = name;
+		this.descriptor = descriptor;
 		this.modifiers = modifiers;
 		this.parent = parent;
+		this.proxyType = proxyType;
+	}
+
+	/**
+	 * Indicates whether the given object is a proxy for the same element as this.
+	 * @param obj the object to perform
+	 * @return true if it's equal
+	 */
+	@Override
+	public boolean equals(Object obj) {
+		if(obj instanceof AbstractProxy) {
+			AbstractProxy p = (AbstractProxy) obj;
+			return p.parent.equals(this.parent)
+				&& p.name.equals(this.name)
+				&& p.modifiers == this.modifiers
+				&& p.descriptor.equals(this.descriptor);
+		} else return false;
 	}
 
 	/**
@@ -72,23 +75,28 @@ public abstract class AbstractProxy {
 	public abstract static class Builder<T extends AbstractProxy> {
 
 		/**
-		 * The name of the member.
+		 * The name of the element.
 		 */
-		protected final String name;
+		protected String name;
 
 		/**
-		 * The modifiers of the member, as a packed int.
+		 * The modifiers of the element, as a packed int.
 		 */
 		protected int modifiers;
 
 		/**
 		 * The fully qualified name of the parent.
 		 */
-		protected String parent;
+		protected QualifiableProxy parent;
+
+		/**
+		 * The descriptor of the element.
+		 */
+		protected String descriptor;
 
 		/**
 		 * The constructor.
-		 * @param name the name of the member
+		 * @param name the name of the element
 		 */
 		protected Builder(String name) {
 			this.name = name;
@@ -96,33 +104,51 @@ public abstract class AbstractProxy {
 		}
 
 		/**
-		 * @param parentFQN the fully qualified name of the parent
+		 * @param newModifier the modifier to add
 		 * @return the current state of the builder
 		 */
-		public Builder<T> setParent(String parentFQN) {
-			this.parent = parentFQN;
+		public Builder<T> addModifier(int newModifier) {
+			this.modifiers |= newModifier;
 			return this;
 		}
 
 		/**
-		 * @param newModifier the modifier to add
+		 * @param newModifier the new modifier value
 		 * @return the current state of the builder
 		 */
-		public Builder<T> addModifier(int newModifier) {
-			this.modifiers |= newModifier;
+		public Builder<T> setModifiers(int newModifier) {
+			this.modifiers = newModifier;
 			return this;
 		}
 
 		/**
-		 * @param newModifier the new modifier value
+		 * @param parent the {@link QualifiableProxy} representing the parent
 		 * @return the current state of the builder
 		 */
-		public Builder<T> setModifier(int newModifier) {
-			this.modifiers = newModifier;
+		public Builder<T> setParent(QualifiableProxy parent) {
+			this.parent = parent;
 			return this;
 		}
 
 		/**
+		 * Sets {@link Type} for this element from the descriptor, passed as a {@link String}.
+		 * @param descriptor the descriptor passed as a {@link String}
+		 * @return the builder's state after the change
+		 */
+		public Builder<T> setDescriptor(String descriptor) {
+			this.descriptor = descriptor;
+			return this;
+		}
+
+		/**
+		 * @param type the {@link Type} corresponding to the element
+		 * @return the current state of the builder
+		 */
+		public Builder<T> setType(Type type) {
+			return this.setDescriptor(type.getDescriptor());
+		}
+
+		/**
 		 * @return the built proxy object
 		 */
 		public abstract T build();
diff --git a/src/main/java/ftbsc/lll/proxies/FieldProxy.java b/src/main/java/ftbsc/lll/proxies/FieldProxy.java
deleted file mode 100644
index 0edd735..0000000
--- a/src/main/java/ftbsc/lll/proxies/FieldProxy.java
+++ /dev/null
@@ -1,116 +0,0 @@
-package ftbsc.lll.proxies;
-
-import ftbsc.lll.tools.DescriptorBuilder;
-import org.objectweb.asm.Type;
-
-import java.lang.reflect.Field;
-
-/**
- * A container for information about class fields to be used
- * in ASM patching.
- * @since 0.3.0
- */
-public class FieldProxy extends AbstractProxy {
-
-	/**
-	 * The descriptor of the field's type.
-	 */
-	private final String typeDescriptor;
-
-	/**
-	 * A public constructor, builds a proxy from a {@link Field}
-	 * obtained from reflection.
-	 * @param f the {@link Field} object corresponding to this.
-	 */
-	public FieldProxy(Field f) {
-		super(f.getName(), f.getModifiers(), Type.getInternalName(f.getDeclaringClass()));
-		this.typeDescriptor = Type.getDescriptor(f.getType());
-	}
-
-	/**
-	 * A protected constructor, called only from the builder.
-	 * @param name the name of the field
-	 * @param modifiers the modifiers of the field
-	 * @param parent the FQN of the parent class of the field
-	 * @param typeDescriptor the type descriptor of the field
-	 */
-	FieldProxy(String name, int modifiers, String parent, String typeDescriptor) {
-		super(name, modifiers, parent);
-		this.typeDescriptor = typeDescriptor;
-	}
-
-	/**
-	 * @return the field's type descriptor
-	 */
-	@Override
-	public String getDescriptor() {
-		return typeDescriptor;
-	}
-
-	/**
-	 * Returns a new instance of {@link FieldProxy.Builder}.
-	 * @param name the name of the field
-	 * @return the builder object for field proxies
-	 */
-	public static Builder builder(String name) {
-		return new Builder(name);
-	}
-
-	/**
-	 * A builder object for {@link FieldProxy}.
-	 */
-	public static class Builder extends AbstractProxy.Builder<FieldProxy> {
-		/**
-		 * The descriptor of the field's type.
-		 */
-		private String typeDescriptor;
-
-		/**
-		 * The constructor of the builder, used only internally.
-		 * @param name the name of the field
-		 */
-		Builder(String name) {
-			super(name);
-		}
-
-		/**
-		 * Sets the descriptor of the field type to the given {@link String}.
-		 * @param typeDescriptor the descriptor of the field type
-		 * @return the builder's state after the change
-		 */
-		public Builder setDescriptor(String typeDescriptor) {
-			this.typeDescriptor = typeDescriptor;
-			return this;
-		}
-
-		/**
-		 * Sets the descriptor of the field type to match the give {@link Class}.
-		 * @param fqn the fully qualified name of the field type
-		 * @param arrayLevel the array level of the field type
-		 * @return the builder's state after the change
-		 */
-		public Builder setType(String fqn, int arrayLevel) {
-			this.typeDescriptor = DescriptorBuilder.nameToDescriptor(fqn, arrayLevel);
-			return this;
-		}
-
-		/**
-		 * Sets the descriptor of the field type to match the give {@link Class}.
-		 * @param type a {@link Class} object representing the field type
-		 * @return the builder's state after the change
-		 */
-		public Builder setType(Class<?> type) {
-			this.typeDescriptor = Type.getDescriptor(type);
-			return this;
-		}
-
-		/**
-		 * Builds a {@link FieldProxy} of the given kind.
-		 * @return the built {@link FieldProxy}
-		 */
-		@Override
-		public FieldProxy build() {
-			return new FieldProxy(this.name, this.modifiers, this.parent, this.typeDescriptor);
-		}
-	}
-}
diff --git a/src/main/java/ftbsc/lll/proxies/MethodProxy.java b/src/main/java/ftbsc/lll/proxies/MethodProxy.java
deleted file mode 100644
index b9abe84..0000000
--- a/src/main/java/ftbsc/lll/proxies/MethodProxy.java
+++ /dev/null
@@ -1,230 +0,0 @@
-package ftbsc.lll.proxies;
-
-import ftbsc.lll.tools.DescriptorBuilder;
-import org.objectweb.asm.Type;
-
-import java.lang.reflect.Method;
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * A container for information about class methods to be used
- * in ASM patching.
- * @since 0.3.0
- */
-public class MethodProxy extends AbstractProxy {
-
-	/**
-	 * The parameters of the method.
-	 * It holds fully qualified names for objects, and {@link Class}
-	 * objects for primitives.
-	 */
-	private final Object[] parameters;
-
-	/**
-	 * The return type of the method.
-	 * It contains if it's an object, or a {@link Class}
-	 * object for primitives.
-	 */
-	private final Object returnType;
-
-	/**
-	 * Caches the the descriptor after generating it once for
-	 * performance.
-	 */
-	private String descriptorCache;
-
-	/**
-	 * A public constructor, builds a proxy from a {@link Method}
-	 * obtained from reflection.
-	 * @param m the {@link Method} object corresponding to this.
-	 */
-	public MethodProxy(Method m) {
-		super(m.getName(), m.getModifiers(), Type.getInternalName(m.getDeclaringClass()));
-		List<Object> parameters = new ArrayList<>();
-		for(Class<?> p : m.getParameterTypes())
-			parameters.add(p.isPrimitive() ? p	: new TypeContainer(p));
-		this.parameters = parameters.toArray();
-		Class<?> returnType = m.getReturnType();
-		this.returnType = returnType.isPrimitive() ? returnType	: new TypeContainer(returnType);
-	}
-
-	/**
-	 * A protected constructor, called only from the builder.
-	 * @param name the name of the method
-	 * @param modifiers the modifiers of the method
-	 * @param parent the FQN of the parent class of the method
-	 * @param parameters the parameters of the method
-	 * @param returnType the return type of the method
-	 */
-	protected MethodProxy(String name, int modifiers, String parent, Object[] parameters, Object returnType) {
-		super(name, modifiers, parent);
-		this.parameters = parameters;
-		this.returnType = returnType;
-		this.descriptorCache = null;
-	}
-
-	/**
-	 * Builds (or returns from cache if present)
-	 * the method's descriptor.
-	 * @return the method's descriptor
-	 */
-	@Override
-	public String getDescriptor() {
-		if(this.descriptorCache != null)
-			return this.descriptorCache;
-		DescriptorBuilder b = new DescriptorBuilder();
-		for(Object p : this.parameters)
-			addTypeToDescriptorBuilder(b, p, false);
-		addTypeToDescriptorBuilder(b, this.returnType, true);
-		this.descriptorCache = b.build();
-		return this.descriptorCache;
-	}
-
-	/**
-	 * A static method used internally to detect and correctly insert a
-	 * {@link TypeContainer} into a {@link DescriptorBuilder}.
-	 * @param b the {@link DescriptorBuilder}
-	 * @param p the {@link TypeContainer}
-	 * @param isReturnType whether it should be inserted as a return type
-	 */
-	private static void addTypeToDescriptorBuilder(DescriptorBuilder b, Object p, boolean isReturnType) {
-		if(p instanceof TypeContainer) {
-			TypeContainer param = (TypeContainer) p;
-			if(isReturnType)
-				b.setReturnType(param.fqn, param.arrayLevel);
-			else b.addParameter(param.fqn, param.arrayLevel);
-		} else {
-			if(isReturnType)
-				b.setReturnType((Class<?>) p);
-			else b.addParameter((Class<?>) p);
-		}
-	}
-
-	/**
-	 * Returns a new instance of {@link MethodProxy.Builder}.
-	 * @param name the name of the method
-	 * @return the builder object for method proxies
-	 */
-	public static Builder builder(String name) {
-		return new Builder(name);
-	}
-
-	/**
-	 * A builder object for {@link MethodProxy}.
-	 */
-	public static class Builder extends AbstractProxy.Builder<MethodProxy> {
-		/**
-		 * The parameters of the method.
-		 */
-		private final List<Object> parameters;
-
-		/**
-		 * The return type of the method. Defaults to void.
-		 */
-		private Object returnType;
-
-		/**
-		 * The constructor of the builder, used only internally.
-		 * @param name the name of the method
-		 */
-		Builder(String name) {
-			super(name);
-			this.parameters = new ArrayList<>();
-			this.returnType = void.class;
-		}
-
-		/**
-		 * Adds a parameter of a given type.
-		 * @param fqn the fully qualified name of the parameter type
-		 * @param arrayLevel the array level of the parameter type
-		 * @return the builder's state after the change
-		 */
-		public Builder addParameter(String fqn, int arrayLevel) {
-			this.parameters.add(new TypeContainer(fqn, arrayLevel));
-			return this;
-		}
-
-		/**
-		 * Adds a parameter of a given type.
-		 * @param paramType the {@link Class} object corresponding to
-		 *                  the parameter type.
-		 * @return the builder's state after the change
-		 */
-		public Builder addParameter(Class<?> paramType) {
-			this.parameters.add(paramType);
-			return this;
-		}
-
-		/**
-		 * Sets the return type to the given type.
-		 * @param fqn the fully qualified name of the return type
-		 * @param arrayLevel the array level of the return type
-		 * @return the builder's state after the change
-		 */
-		public Builder setReturnType(String fqn, int arrayLevel) {
-			this.returnType = new TypeContainer(fqn, arrayLevel);
-			return this;
-		}
-
-		/**
-		 * Sets the return type to the given type.
-		 * @param returnType the {@link Class} object corresponding to
-		 *                   the return type
-		 * @return the builder's state after the change
-		 */
-		public Builder setReturnType(Class<?> returnType) {
-			this.returnType = returnType;
-			return this;
-		}
-
-		/**
-		 * Builds a {@link MethodProxy} of the given kind.
-		 * @return the built {@link MethodProxy}
-		 */
-		@Override
-		public MethodProxy build() {
-			return new MethodProxy(name, modifiers, parent, parameters.toArray(), returnType);
-		}
-	}
-
-	/**
-	 * A container class, holding information about a given type.
-	 */
-	protected static class TypeContainer {
-		/**
-		 * The fully qualified name of the type.
-		 */
-		public final String fqn;
-
-		/**
-		 * The array level of the type.
-		 */
-		public final int arrayLevel;
-
-		/**
-		 * Public constructor for the class.
-		 * @param fqn the fully qualified name of the type
-		 * @param arrayLevel the array level of the type
-		 */
-		public TypeContainer(String fqn, int arrayLevel) {
-			this.fqn = fqn;
-			this.arrayLevel = arrayLevel;
-		}
-
-		/**
-		 * Public constructor for the class, extracting the
-		 * necessary information from a {@link Class} object.
-		 * @param clazz the class object
-		 */
-		public TypeContainer(Class<?> clazz) {
-			int arrayLevel = 0;
-			while(clazz.isArray()) {
-				arrayLevel++;
-				clazz = clazz.getComponentType();
-			}
-			this.arrayLevel = arrayLevel;
-			this.fqn = clazz.getCanonicalName();
-		}
-	}
-}
diff --git a/src/main/java/ftbsc/lll/proxies/ProxyType.java b/src/main/java/ftbsc/lll/proxies/ProxyType.java
new file mode 100644
index 0000000..1fd8169
--- /dev/null
+++ b/src/main/java/ftbsc/lll/proxies/ProxyType.java
@@ -0,0 +1,11 @@
+package ftbsc.lll.proxies;
+
+/**
+ * An enum listing the various proxies.
+ */
+public enum ProxyType {
+	FIELD,
+	METHOD,
+	TYPE,
+	PACKAGE
+}
diff --git a/src/main/java/ftbsc/lll/proxies/QualifiableProxy.java b/src/main/java/ftbsc/lll/proxies/QualifiableProxy.java
new file mode 100644
index 0000000..d245124
--- /dev/null
+++ b/src/main/java/ftbsc/lll/proxies/QualifiableProxy.java
@@ -0,0 +1,67 @@
+package ftbsc.lll.proxies;
+
+/**
+ * A proxy for elements who have a fully-qualified name.
+ * @since 0.4.0
+ */
+public abstract class QualifiableProxy extends AbstractProxy {
+	/**
+	 * The fully-qualified name of the element represented by this proxy.
+	 */
+	public final String fullyQualifiedName;
+
+	/**
+	 * The "internal name" (fully-qualified with slashes) of the element
+	 * represented by this proxy.
+	 */
+	public final String internalName;
+
+	/**
+	 * The protected constructor, should be called by all classes extending this in theirs.
+	 * @param descriptor the descriptor for the element
+	 * @param modifiers the modifiers, as a packed int
+	 * @param parent the {@link QualifiableProxy} representing the parent of this element
+	 * @param fullyQualifiedName the FQN of the element
+	 * @param proxyType the {@link ProxyType} being represented here
+	 */
+	protected QualifiableProxy(String descriptor, int modifiers, QualifiableProxy parent, String fullyQualifiedName, ProxyType proxyType) {
+		super(extractSimpleNameFromFQN(fullyQualifiedName), descriptor, modifiers, parent, proxyType);
+		this.fullyQualifiedName = fullyQualifiedName;
+		this.internalName = this.fullyQualifiedName.replace('.', '/');
+	}
+
+	/**
+	 * Returns a {@link String} containing the FQN of the parent element
+	 * to this, which may represent a package or class.
+	 * @param fqn the fully qualified name of the element
+	 * @return the parent, or null if the parent was the root element
+	 */
+	protected static String extractParentFromFQN(String fqn) {
+		String lastSeparator = fqn.contains("$") ? "\\$" : "\\.";
+		String[] split = fqn.split(lastSeparator);
+		if(split.length == 1) return null;
+		return fqn.substring(0, split[split.length - 1].length() - 1);
+	}
+
+	/**
+	 * Returns a {@link String} containing the simple name of the element.
+	 * @param fqn the fully qualified name of the element
+	 * @return the simple name
+	 */
+	protected static String extractSimpleNameFromFQN(String fqn) {
+		String lastSeparator = fqn.contains("$") ? "\\$" : "\\.";
+		String[] split = fqn.split(lastSeparator);
+		if(split.length == 1) return fqn;
+		else return split[split.length - 1];
+	}
+
+	/**
+	 * Indicates whether the given object is a proxy for the same element as this.
+	 * @param obj the object to perform
+	 * @return true if it's equal
+	 */
+	@Override
+	public boolean equals(Object obj) {
+		return obj instanceof QualifiableProxy && super.equals(obj) && ((QualifiableProxy) obj).fullyQualifiedName.equals(fullyQualifiedName);
+	}
+}
diff --git a/src/main/java/ftbsc/lll/proxies/impl/FieldProxy.java b/src/main/java/ftbsc/lll/proxies/impl/FieldProxy.java
new file mode 100644
index 0000000..ceb8277
--- /dev/null
+++ b/src/main/java/ftbsc/lll/proxies/impl/FieldProxy.java
@@ -0,0 +1,98 @@
+package ftbsc.lll.proxies.impl;
+
+import ftbsc.lll.proxies.AbstractProxy;
+import ftbsc.lll.proxies.ProxyType;
+import ftbsc.lll.proxies.QualifiableProxy;
+import org.objectweb.asm.Type;
+
+import java.lang.reflect.Field;
+
+/**
+ * A container for information about class fields to be used
+ * in ASM patching.
+ * @since 0.3.0
+ */
+public class FieldProxy extends AbstractProxy {
+	/**
+	 * Protected constructor, called only from the builder.
+	 * @param name the name of the field
+	 * @param descriptor the descriptor of the field
+	 * @param modifiers the modifiers of the field
+	 * @param parent the {@link QualifiableProxy} for the parent
+	 */
+	protected FieldProxy(String name, String descriptor, int modifiers, QualifiableProxy parent) {
+		super(name, descriptor, modifiers, parent, ProxyType.FIELD);
+	}
+
+	/**
+	 * A public constructor, builds a proxy from a {@link Field}
+	 * obtained from reflection.
+	 * @param f the {@link Field} object corresponding to this.
+	 */
+	public FieldProxy(Field f) {
+		this(f.getName(), Type.getDescriptor(f.getType()), f.getModifiers(), TypeProxy.from(f.getDeclaringClass()));
+	}
+
+	/**
+	 * Returns a new instance of {@link FieldProxy.Builder}.
+	 * @param name the name of the field
+	 * @return the builder object for field proxies
+	 */
+	public static Builder builder(String name) {
+		return new Builder(name);
+	}
+
+	/**
+	 * Indicates whether the given object is a proxy for the same element as this.
+	 * @param obj the object to perform
+	 * @return true if it's equal
+	 */
+	@Override
+	public boolean equals(Object obj) {
+		return obj instanceof FieldProxy && super.equals(obj);
+	}
+
+	/**
+	 * A builder object for {@link FieldProxy}.
+	 */
+	public static class Builder extends AbstractProxy.Builder<FieldProxy> {
+		/**
+		 * The constructor of the builder, used only internally.
+		 * @param name the name of the field
+		 */
+		Builder(String name) {
+			super(name);
+		}
+
+		/**
+		 * Sets the parent class of this field to the one described by the
+		 * fully qualified name and with the given modifiers.
+		 * @param parentFQN the fully qualified name of the parent
+		 * @param modifiers the modifiers of the parent
+		 * @return the builder's state after the change
+		 */
+		public Builder setParent(String parentFQN, int modifiers) {
+			super.setParent(TypeProxy.from(parentFQN, 0, modifiers));
+			return this;
+		}
+
+		/**
+		 * Sets the parent class of this field to the one described by the
+		 * fully qualified name.
+		 * @param parentFQN the fully qualified name of the parent
+		 * @return the builder's state after the change
+		 */
+		public Builder setParent(String parentFQN) {
+			return this.setParent(parentFQN, 0);
+		}
+
+		/**
+		 * Builds a {@link FieldProxy} of the given kind.
+		 * @return the built {@link FieldProxy}
+		 */
+		@Override
+		public FieldProxy build() {
+			return new FieldProxy(this.name, this.descriptor, this.modifiers, this.parent);
+		}
+	}
+}
diff --git a/src/main/java/ftbsc/lll/proxies/impl/MethodProxy.java b/src/main/java/ftbsc/lll/proxies/impl/MethodProxy.java
new file mode 100644
index 0000000..3710d36
--- /dev/null
+++ b/src/main/java/ftbsc/lll/proxies/impl/MethodProxy.java
@@ -0,0 +1,188 @@
+package ftbsc.lll.proxies.impl;
+
+import ftbsc.lll.proxies.AbstractProxy;
+import ftbsc.lll.proxies.ProxyType;
+import ftbsc.lll.proxies.QualifiableProxy;
+import org.objectweb.asm.Type;
+
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import static ftbsc.lll.tools.DescriptorBuilder.nameToDescriptor;
+
+/**
+ * A container for information about class methods to be used
+ * in ASM patching.
+ * @since 0.3.0
+ */
+public class MethodProxy extends AbstractProxy {
+
+	/**
+	 * An array of {@link TypeProxy} each representing the parameters of the method.
+	 */
+	public final TypeProxy[] parameters;
+
+	/**
+	 * The {@link TypeProxy} for the return type of the method.
+	 */
+	public final TypeProxy returnType;
+
+	/**
+	 * A protected constructor, called only from the builder.
+	 * @param name the name of the method
+	 * @param modifiers the modifiers of the method
+	 * @param parent the {@link QualifiableProxy} for the parent
+	 * @param parameters the parameters of the method
+	 * @param returnType the return type of the method
+	 */
+	protected MethodProxy(String name, int modifiers, QualifiableProxy parent, Type[] parameters, Type returnType) {
+		super(name, Type.getMethodDescriptor(returnType, parameters), modifiers, parent, ProxyType.METHOD);
+		this.parameters = Arrays.stream(parameters)
+			.map(t -> TypeProxy.from(t, 0))
+			.toArray(TypeProxy[]::new);
+		this.returnType = TypeProxy.from(returnType, 0);
+	}
+
+	/**
+	 * A public constructor, builds a proxy from a {@link Method}
+	 * obtained from reflection.
+	 * @param m the {@link Method} object corresponding to this.
+	 */
+	public MethodProxy(Method m) {
+		this(m.getName(),
+			m.getModifiers(),
+			TypeProxy.from(m.getDeclaringClass()),
+			Type.getArgumentTypes(m),
+			Type.getReturnType(m)
+		);
+	}
+
+	/**
+	 * Returns a new instance of {@link MethodProxy.Builder}.
+	 * @param name the name of the method
+	 * @return the builder object for method proxies
+	 */
+	public static Builder builder(String name) {
+		return new Builder(name);
+	}
+
+	/**
+	 * Indicates whether the given object is a proxy for the same element as this.
+	 * @param obj the object to perform
+	 * @return true if it's equal
+	 */
+	@Override
+	public boolean equals(Object obj) {
+		if(obj instanceof MethodProxy) {
+			MethodProxy m = (MethodProxy) obj;
+			return super.equals(obj) && m.returnType.equals(this.returnType) && Arrays.equals(m.parameters, this.parameters);
+		} else return false;
+	}
+
+	/**
+	 * A builder object for {@link MethodProxy}.
+	 */
+	public static class Builder extends AbstractProxy.Builder<MethodProxy> {
+		/**
+		 * The parameters of the method.
+		 */
+		private final List<Type> parameters;
+
+		/**
+		 * The return type of the method. Defaults to void.
+		 */
+		private Type returnType;
+
+		/**
+		 * The constructor of the builder, used only internally.
+		 * @param name the name of the method
+		 */
+		Builder(String name) {
+			super(name);
+			this.parameters = new ArrayList<>();
+			this.returnType = Type.getType(void.class);
+		}
+
+		/**
+		 * Adds a parameter of a given type.
+		 * @param fqn the fully qualified name of the parameter type
+		 * @param arrayLevel the array level of the parameter type
+		 * @return the builder's state after the change
+		 */
+		public Builder addParameter(String fqn, int arrayLevel) {
+			this.parameters.add(Type.getType(nameToDescriptor(fqn, arrayLevel)));
+			return this;
+		}
+
+		/**
+		 * Adds a parameter of a given type.
+		 * @param paramType the {@link Class} object corresponding to
+		 *                  the parameter type.
+		 * @return the builder's state after the change
+		 */
+		public Builder addParameter(Class<?> paramType) {
+			this.parameters.add(Type.getType(paramType));
+			return this;
+		}
+
+		/**
+		 * Sets the return type to the given type.
+		 * @param fqn the fully qualified name of the return type
+		 * @param arrayLevel the array level of the return type
+		 * @return the builder's state after the change
+		 */
+		public Builder setReturnType(String fqn, int arrayLevel) {
+			this.returnType = Type.getType(nameToDescriptor(fqn, arrayLevel));
+			return this;
+		}
+
+		/**
+		 * Sets the parent class of this method to the one described by the
+		 * fully qualified name and with the given modifiers.
+		 * @param parentFQN the fully qualified name of the parent
+		 * @param modifiers the modifiers of the parent
+		 * @return the builder's state after the change
+		 */
+		public Builder setParent(String parentFQN, int modifiers) {
+			super.setParent(TypeProxy.from(parentFQN, 0, modifiers));
+			return this;
+		}
+
+		/**
+		 * Sets the parent class of this method to the one described by the
+		 * fully qualified name.
+		 * @param parentFQN the fully qualified name of the parent
+		 * @return the builder's state after the change
+		 */
+		public Builder setParent(String parentFQN) {
+			return this.setParent(parentFQN, 0);
+		}
+
+		/**
+		 * Sets the return type to the given type.
+		 * @param returnType the {@link Class} object corresponding to
+		 *                   the return type
+		 * @return the builder's state after the change
+		 */
+		public Builder setReturnType(Class<?> returnType) {
+			this.returnType = Type.getType(returnType);
+			return this;
+		}
+
+		/**
+		 * Builds a {@link MethodProxy} of the given kind.
+		 * @return the built {@link MethodProxy}
+		 */
+		@Override
+		public MethodProxy build() {
+			return new MethodProxy(
+				this.name,
+				this.modifiers,
+				this.parent,
+				this.parameters.toArray(new Type[0]),
+				this.returnType);
+		}
+	}
+}
diff --git a/src/main/java/ftbsc/lll/proxies/impl/PackageProxy.java b/src/main/java/ftbsc/lll/proxies/impl/PackageProxy.java
new file mode 100644
index 0000000..5989da3
--- /dev/null
+++ b/src/main/java/ftbsc/lll/proxies/impl/PackageProxy.java
@@ -0,0 +1,54 @@
+package ftbsc.lll.proxies.impl;
+
+import ftbsc.lll.proxies.ProxyType;
+import ftbsc.lll.proxies.QualifiableProxy;
+
+/**
+ * A container for information about a package.
+ * @since 0.4.0
+ */
+public class PackageProxy extends QualifiableProxy {
+
+	/**
+	 * The {@link PackageProxy} representing the root package.
+	 */
+	public static final PackageProxy ROOT = new PackageProxy(null, "");
+
+	/**
+	 * The protected constructor, called only from {@link PackageProxy#from(String)}.
+	 * @param parent the {@link PackageProxy} representing the parent
+	 * @param fqn the fully-qualified name of this package
+	 */
+	protected PackageProxy(PackageProxy parent, String fqn) {
+		super(null, 0, parent, fqn, ProxyType.PACKAGE);
+	}
+
+	/**
+	 * Builds a {@link PackageProxy} from its fully-qualified name.
+	 * @param fqn the fully-qualified name of the package
+	 * @return the built {@link PackageProxy}
+	 */
+	protected static PackageProxy from(String fqn) {
+		if(fqn == null || fqn.equals("")) return ROOT;
+		return new PackageProxy(from(extractParentFromFQN(fqn)), fqn);
+	}
+
+	/**
+	 * Builds a {@link PackageProxy} from a reflective {@link Package} object.
+	 * @param p the {@link Package} object
+	 * @return the built {@link PackageProxy}
+	 */
+	protected static PackageProxy from(Package p) {
+		return from(extractParentFromFQN(p.getName()));
+	}
+
+	/**
+	 * Indicates whether the given object is a proxy for the same element as this.
+	 * @param obj the object to perform
+	 * @return true if it's equal
+	 */
+	@Override
+	public boolean equals(Object obj) {
+		return obj instanceof PackageProxy && super.equals(obj);
+	}
+}
diff --git a/src/main/java/ftbsc/lll/proxies/impl/TypeProxy.java b/src/main/java/ftbsc/lll/proxies/impl/TypeProxy.java
new file mode 100644
index 0000000..9f613b0
--- /dev/null
+++ b/src/main/java/ftbsc/lll/proxies/impl/TypeProxy.java
@@ -0,0 +1,199 @@
+package ftbsc.lll.proxies.impl;
+
+import ftbsc.lll.proxies.AbstractProxy;
+import ftbsc.lll.proxies.ProxyType;
+import ftbsc.lll.proxies.QualifiableProxy;
+import org.objectweb.asm.Type;
+
+import java.lang.reflect.Modifier;
+
+import static ftbsc.lll.tools.DescriptorBuilder.nameToDescriptor;
+
+/**
+ * A container for information about classes to be used
+ * in ASM patching.
+ * @since 0.4.0
+ */
+public class TypeProxy extends QualifiableProxy {
+	/**
+	 * Whether this proxy represents a primitive.
+	 */
+	public final boolean primitive;
+
+	/**
+	 * Protected constructor, called only from the builder.
+	 * @param name the name of the class
+	 * @param descriptor the descriptor of the class
+	 * @param modifiers the modifiers of the class
+	 * @param parent the package containing this class
+	 * @param primitive whether the proxy is a primitive
+	 */
+	protected TypeProxy(String name, String descriptor, int modifiers, String parent, boolean primitive) {
+		super(descriptor, modifiers, PackageProxy.from(parent), String.format("%s.%s", name, parent), ProxyType.TYPE);
+		this.primitive = primitive;
+	}
+
+	/**
+	 * Protected constructor, called only from the builder.
+	 * @param name the name of the class
+	 * @param descriptor the descriptor of the element
+	 * @param modifiers the modifiers of the class
+	 * @param primitive whether the proxy is a primitive
+	 * @param containerClass the FQN of the parent class of the class
+	 */
+	protected TypeProxy(String name, String descriptor, int modifiers, QualifiableProxy containerClass, boolean primitive) {
+		super(descriptor, modifiers, containerClass, String.format("%s$%s", name, containerClass.fullyQualifiedName), ProxyType.TYPE);
+		this.primitive = primitive;
+	}
+
+	/**
+	 * Builds a {@link TypeProxy} from a {@link Type} and modifiers.
+	 * @param type the {@link Type} representing this Class
+	 * @param modifiers the modifiers of the class
+	 * @return the builty {@link TypeProxy}
+	 */
+	public static TypeProxy from(Type type, int modifiers) {
+		while(type.getSort() == Type.ARRAY)
+			type = type.getElementType();
+		String fqn = type.getInternalName().replace('/', '.');
+		String simpleName = extractSimpleNameFromFQN(fqn);
+		String parent = extractParentFromFQN(fqn);
+		boolean primitive = type.getSort() < Type.ARRAY;
+		if(fqn.contains("$"))
+			return new TypeProxy(simpleName, type.getDescriptor(), modifiers, from(type, Modifier.PUBLIC), primitive);
+		else return new TypeProxy(simpleName, type.getDescriptor(), modifiers, parent, primitive);
+	}
+
+	/**
+	 * Builds a {@link TypeProxy} given only the fully-qualified name and modifiers.
+	 * If present, parent classes will be assumed to have {@code public} as their
+	 * only modifier.
+	 * @param fqn the fully qualified name of the desired class
+	 * @param arrayLevel the array level for this type
+	 * @param modifiers the access modifiers of the desired class
+	 * @return the built {@link TypeProxy}
+	 */
+	protected static TypeProxy from(String fqn, int arrayLevel, int modifiers) {
+		return from(Type.getObjectType(nameToDescriptor(fqn, arrayLevel)), modifiers);
+	}
+
+	/**
+	 * Builds a {@link TypeProxy} from a {@link Class} object.
+	 * @param clazz the {@link Class} object representing the target class
+	 * @return the built {@link TypeProxy}
+	 */
+	public static TypeProxy from(Class<?> clazz) {
+		Class<?> parentClass = clazz.getEnclosingClass();
+		if(parentClass == null)
+			return new TypeProxy(
+				clazz.getSimpleName(),
+				Type.getDescriptor(clazz),
+				clazz.getModifiers(),
+				clazz.getPackage().getName(),
+				clazz.isPrimitive()
+			);
+		else
+			return new TypeProxy(
+				clazz.getSimpleName(),
+				Type.getDescriptor(clazz),
+				clazz.getModifiers(),
+				from(parentClass),
+				clazz.isPrimitive()
+			);
+	}
+
+	/**
+	 * Returns a new instance of {@link TypeProxy.Builder}.
+	 * @param name the name of the class
+	 * @return the builder object for class proxies
+	 */
+	public static Builder builder(String name) {
+		return new Builder(name);
+	}
+
+	/**
+	 * Indicates whether the given object is a proxy for the same element as this.
+	 * @param obj the object to perform
+	 * @return true if it's equal
+	 */
+	@Override
+	public boolean equals(Object obj) {
+		return obj instanceof TypeProxy && super.equals(obj);
+	}
+
+	/**
+	 * A builder object for {@link TypeProxy}.
+	 */
+	public static class Builder extends AbstractProxy.Builder<TypeProxy> {
+
+		/**
+		 * Whether the proxy represents a primitive.
+		 */
+		private boolean primitive;
+
+		/**
+		 * The constructor of the builder, used only internally.
+		 * @param name the "simple name" of the class
+		 */
+		Builder(String name) {
+			super(name);
+			this.primitive = false;
+		}
+
+		/**
+		 * Sets this class as an inner class and sets the containing
+		 * class to the given class object.
+		 * @param containerClass the {@link Class} representing the
+		 *                       container class
+		 * @return the builder's state after the change
+		 */
+		public Builder setParent(Class<?> containerClass) {
+			super.setParent(TypeProxy.from(containerClass));
+			return this;
+		}
+
+		/**
+		 * Sets this class as an inner class and builds a {@link TypeProxy}
+		 * from the given parent and modifiers.
+		 * @param parentFQN the fully qualified name of the parent
+		 * @param modifiers the modifiers of the parent (if it's a class)
+		 * @param isParentPackage whether this parent should be interpreted as a package or class
+		 * @return the builder's state after the change
+		 */
+		public Builder setParent(String parentFQN, int modifiers, boolean isParentPackage) {
+			super.setParent(isParentPackage ? PackageProxy.from(parentFQN) : TypeProxy.from(parentFQN, 0, modifiers));
+			return this;
+		}
+
+		/**
+		 * Sets this class as an inner class and builds a {@link TypeProxy}
+		 * from the given parent.
+		 * @param parentFQN the fully qualified name of the parent
+		 * @param isParentPackage whether this parent should be interpreted as a package or class
+		 * @return the builder's state after the change
+		 */
+		public Builder setParent(String parentFQN, boolean isParentPackage) {
+			return this.setParent(parentFQN, 0, isParentPackage);
+		}
+
+		/**
+		 * Sets the primitive flag to true or false, to signal that the type here specified
+		 * is a primitive.
+		 * @param primitive the new state of the primitive flag
+		 * @return the builder's state after the change
+		 */
+		public Builder setPrimitive(boolean primitive) {
+			this.primitive = primitive;
+			return this;
+		}
+
+		/**
+		 * Builds a {@link TypeProxy} of the given kind.
+		 * @return the built {@link TypeProxy}
+		 */
+		@Override
+		public TypeProxy build() {
+			return new TypeProxy(this.name, this.descriptor, this.modifiers, this.parent, this.primitive);
+		}
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/ftbsc/lll/tools/DescriptorBuilder.java b/src/main/java/ftbsc/lll/tools/DescriptorBuilder.java
index d59f97d..1b33790 100644
--- a/src/main/java/ftbsc/lll/tools/DescriptorBuilder.java
+++ b/src/main/java/ftbsc/lll/tools/DescriptorBuilder.java
@@ -26,16 +26,15 @@ public class DescriptorBuilder {
 	 * Initialises default values.
 	 */
 	public DescriptorBuilder() {
-
 		this.returnType = Type.getDescriptor(void.class);
 		this.params = new ArrayList<>();
 	}
 
 	/**
 	 * Sets the return type to the given type.
-	 * WARNING: will most likely cause problems if used with objects outside the
-	 * Java SDK. Pass the fully qualified name as a String rather than the Class
-	 * object for non-standard types (such as Minecraft classes).
+	 * Passing a {@link Class} may cause problems if used with objects outside the Java
+	 * SDK. Pass the fully qualified name as a {@link String} rather than the {@link Class}
+	 * object for non-standard types.
 	 * @param returnType the Class object corresponding to the return type
 	 * @return the builder's state after the change
 	 */
@@ -72,9 +71,9 @@ public class DescriptorBuilder {
 	/**
 	 * Adds a parameter of the given class type to the method.
 	 * Parameter order matters.
-	 * WARNING: will most likely cause problems if used with objects outside the
-	 * Java SDK. Pass the fully qualified name as a String rather than the Class
-	 * object for non-standard types (such as Minecraft classes).
+	 * Passing a {@link Class} may cause problems if used with objects outside the Java
+	 * SDK. Pass the fully qualified name as a {@link String} rather than the {@link Class}
+	 * object for non-standard types.
 	 * @param param the Class object corresponding to the parameter
 	 * @return the builder's state after the change
 	 */
@@ -113,7 +112,7 @@ public class DescriptorBuilder {
 
 	/**
 	 * Builds the descriptor into a string.
-	 * Example result: int m(Object[] o) -> ([Ljava/lang/Object;)I
+	 * Example result: {@code int m(Object[] o)} becomes {@code ([Ljava/lang/Object;)I}
 	 * @return the resulting descriptor
 	 */
 	public String build() {
diff --git a/src/main/java/ftbsc/lll/tools/nodes/FieldProxyInsnNode.java b/src/main/java/ftbsc/lll/tools/nodes/FieldProxyInsnNode.java
index 896dc42..d1ac595 100644
--- a/src/main/java/ftbsc/lll/tools/nodes/FieldProxyInsnNode.java
+++ b/src/main/java/ftbsc/lll/tools/nodes/FieldProxyInsnNode.java
@@ -1,6 +1,6 @@
 package ftbsc.lll.tools.nodes;
 
-import ftbsc.lll.proxies.FieldProxy;
+import ftbsc.lll.proxies.impl.FieldProxy;
 import org.objectweb.asm.tree.FieldInsnNode;
 
 /**
@@ -17,11 +17,6 @@ public class FieldProxyInsnNode extends FieldInsnNode {
 	 * @param f a {@link FieldProxy} representing the field to call
 	 */
 	public FieldProxyInsnNode(int opcode, FieldProxy f) {
-		super(
-			opcode,
-			f.getParent().replace('.', '/'),
-			f.getName(),
-			f.getDescriptor()
-		);
+		super(opcode, f.parent.internalName, f.name, f.descriptor);
 	}
 }
diff --git a/src/main/java/ftbsc/lll/tools/nodes/MethodProxyInsnNode.java b/src/main/java/ftbsc/lll/tools/nodes/MethodProxyInsnNode.java
index 63196fd..73a26d7 100644
--- a/src/main/java/ftbsc/lll/tools/nodes/MethodProxyInsnNode.java
+++ b/src/main/java/ftbsc/lll/tools/nodes/MethodProxyInsnNode.java
@@ -1,6 +1,6 @@
 package ftbsc.lll.tools.nodes;
 
-import ftbsc.lll.proxies.MethodProxy;
+import ftbsc.lll.proxies.impl.MethodProxy;
 import org.objectweb.asm.tree.MethodInsnNode;
 
 /**
@@ -18,11 +18,6 @@ public class MethodProxyInsnNode extends MethodInsnNode {
 	 * @param m a {@link MethodProxy} representing the method to call
 	 */
 	public MethodProxyInsnNode(int opcode, MethodProxy m) {
-		super(
-			opcode,
-			m.getParent().replace('.', '/'),
-			m.getName(),
-			m.getDescriptor()
-		);
+		super(opcode,	m.parent.internalName, m.name, m.descriptor);
 	}
 }
diff --git a/src/main/java/ftbsc/lll/tools/nodes/TypeProxyInsnNode.java b/src/main/java/ftbsc/lll/tools/nodes/TypeProxyInsnNode.java
new file mode 100644
index 0000000..9e78dc9
--- /dev/null
+++ b/src/main/java/ftbsc/lll/tools/nodes/TypeProxyInsnNode.java
@@ -0,0 +1,23 @@
+package ftbsc.lll.tools.nodes;
+
+import ftbsc.lll.proxies.impl.TypeProxy;
+import org.objectweb.asm.tree.TypeInsnNode;
+
+/**
+ * Overrides the {@link TypeInsnNode} to add a constructor
+ * taking in a {@link TypeProxy}.
+ * @since 0.4.0
+ */
+public class TypeProxyInsnNode extends TypeInsnNode {
+	/**
+	 * Constructs a new {@link TypeInsnNode} starting from a
+	 * {@link TypeProxy}. The user should ensure that the TypeInsnNode
+	 * represents a declared type before calling this.
+	 * @param opcode the opcode, must be one of NEW, ANEWARRAY,
+	 *               CHECKCAST or INSTANCEOF
+	 * @param t a {@link TypeProxy} representing the type to call
+	 */
+	public TypeProxyInsnNode(int opcode, TypeProxy t) {
+		super(opcode, t.internalName);
+	}
+}