1 files changed, 188 insertions, 0 deletions
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);
+		}
+	}
+}