4 files changed, 285 insertions, 0 deletions
diff --git a/src/main/java/ftbsc/lll/mapper/data/ClassData.java b/src/main/java/ftbsc/lll/mapper/data/ClassData.java
new file mode 100644
index 0000000..04592fd
--- /dev/null
+++ b/src/main/java/ftbsc/lll/mapper/data/ClassData.java
@@ -0,0 +1,144 @@
+package ftbsc.lll.mapper.data;
+
+import ftbsc.lll.exceptions.MappingNotFoundException;
+import ftbsc.lll.mapper.utils.Mapper;
+import ftbsc.lll.mapper.utils.MappingUtils;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+/**
+ * Container class used to store information about classes.
+ */
+public class ClassData {
+
+	/**
+	 * The internal (like the fully-qualified name, but with '/' instead
+	 * of '.') of the class.
+	 */
+	public final String name;
+
+	/**
+	 * The mapped internal (like the fully-qualified name, but with '/'
+	 * instead of '.') of the class.
+	 */
+	public final String nameMapped;
+
+	/**
+	 * A {@link Map} tying each method's signature to its data class.
+	 */
+	private final Map<MethodSignature, MethodData> methods;
+
+	/**
+	 * A {@link Map} tying each field's name to its data class.
+	 */
+	private final Map<String, FieldData> fields;
+
+	/**
+	 * The constructor. It takes in the names (plain and mapped) of a class.
+	 * @param name the plain name
+	 * @param nameMapped the mapped name
+	 */
+	public ClassData(String name, String nameMapped) {
+		this.name = name;
+		this.nameMapped = nameMapped;
+		this.methods = new HashMap<>();
+		this.fields = new HashMap<>();
+	}
+
+	/**
+	 * Adds a method to the target class.
+	 * @param name the method name
+	 * @param nameMapped the mapped method name
+	 * @param descriptor the descriptor of the method
+	 */
+	public void addMethod(String name, String nameMapped, String descriptor) {
+		MethodData data = new MethodData(this, name, nameMapped, descriptor);
+		this.methods.put(data.signature, data);
+	}
+
+	/**
+	 * Adds a field to the target class.
+	 * @param plain the name of the field
+	 * @param mapped the mapped name of the field
+	 */
+	public void addField(String plain, String mapped) {
+		this.fields.put(plain, new FieldData(this, plain, mapped));
+	}
+
+	/**
+	 * Adds a field to the target class.
+	 * @param plain the name of the field
+	 * @param mapped the mapped name of the field
+	 * @param descriptor the plain type descriptor of the field
+	 */
+	public void addField(String plain, String mapped, String descriptor) {
+		this.fields.put(plain, new FieldData(this, plain, mapped, descriptor));
+	}
+
+	/**
+	 * Generates the reverse mappings for this class.
+	 * Should always be called only after the given mapper has finished
+	 * processing all classes.
+	 * @param mapper the mapper that generated this data
+	 * @return a ClassData representing the inverted mappings
+	 */
+	public ClassData generateReverseMappings(Mapper mapper) {
+		ClassData reverse = new ClassData(this.nameMapped, this.name);
+		this.methods.forEach((signature, data) -> reverse.addMethod(nameMapped, signature.name,
+			MappingUtils.mapMethodDescriptor(signature.descriptor, mapper, false)));
+		this.fields.forEach((name, data) -> reverse.addField(data.nameMapped, name, data.descriptor));
+		return reverse;
+	}
+
+	/**
+	 * Gets the {@link MethodData} from its name and descriptor, which may be partial
+	 * (i.e. not include the return type).
+	 * @param methodName the method name
+	 * @param methodDescriptor the method descriptor, which may be partial
+	 * @return the requested {@link MethodData}
+	 * @throws MappingNotFoundException if the mapping wasn't found
+	 */
+	public MethodData mapMethod(String methodName, String methodDescriptor) {
+		List<MethodSignature> signatures = this.methods.keySet().stream().filter(
+			s -> s.name.equals(methodName) && s.descriptor.startsWith(methodDescriptor)
+		).collect(Collectors.toList());
+		if(signatures.size() > 1)
+			throw new RuntimeException(); //should never happen unless something goes horribly wrong
+		else if(signatures.isEmpty())
+			throw new MappingNotFoundException("method",
+				String.format("%s::%s%s", this.name, methodName, methodDescriptor));
+		return this.methods.get(signatures.get(0));
+	}
+
+	/**
+	 * Gets the {@link FieldData} its name.
+	 * @param fieldName the field name
+	 * @return the requested {@link FieldData}
+	 * @throws MappingNotFoundException if the mapping wasn't found
+	 */
+	public FieldData mapField(String fieldName) {
+		FieldData data = this.fields.get(fieldName);
+		if(data == null)
+			throw new MappingNotFoundException("field", String.format("%s.%s", this.name, fieldName));
+		else return data;
+	}
+
+	/**
+	 * Gets the underlying {@link Map} for {@link MethodData}.
+	 * @return a {@link Map} tying each {@link MethodSignature} to its {@link MethodData}
+	 */
+	public Map<MethodSignature, MethodData> getMethods() {
+		return this.methods;
+	}
+
+	/**
+	 * Gets the underlying {@link Map} for {@link FieldData}.
+	 * @return a {@link Map} tying each field name to its {@link FieldData}
+	 */
+	public Map<String, FieldData> getFields() {
+		return this.fields;
+	}
+}
diff --git a/src/main/java/ftbsc/lll/mapper/data/FieldData.java b/src/main/java/ftbsc/lll/mapper/data/FieldData.java
new file mode 100644
index 0000000..3e6cf6c
--- /dev/null
+++ b/src/main/java/ftbsc/lll/mapper/data/FieldData.java
@@ -0,0 +1,55 @@
+package ftbsc.lll.mapper.data;
+
+/**
+ * Container class for method data.
+ */
+public class FieldData {
+	/**
+	 * The internal name of the parent class.
+	 */
+	public final ClassData parentClass;
+
+	/**
+	 * The name of the method.
+	 */
+	public final String name;
+
+	/**
+	 * The name mapped.
+	 */
+	public final String nameMapped;
+
+	/**
+	 * The field's type descriptor.
+	 * Some formats may not specify it; if this was created in one such format,
+	 * this is going to be null.
+	 */
+	public final String descriptor;
+
+	/**
+	 * Constructs a new {@link FieldData} with unspecified descriptor.
+	 * @param parentClass the {@link ClassData} representation of the parent class
+	 * @param name the field name
+	 * @param nameMapped the mapped field name
+	 */
+	public FieldData(ClassData parentClass, String name, String nameMapped) {
+		this.parentClass = parentClass;
+		this.name = name;
+		this.nameMapped = nameMapped;
+		this.descriptor = null;
+	}
+
+	/**
+	 * Constructs a new {@link FieldData} with descriptor.
+	 * @param parentClass the {@link ClassData} representation of the parent class
+	 * @param name the field name
+	 * @param nameMapped the mapped field name
+	 * @param descriptor the field's type descriptor
+	 */
+	public FieldData(ClassData parentClass, String name, String nameMapped, String descriptor) {
+		this.parentClass = parentClass;
+		this.name = name;
+		this.nameMapped = nameMapped;
+		this.descriptor = descriptor;
+	}
+}
diff --git a/src/main/java/ftbsc/lll/mapper/data/MethodData.java b/src/main/java/ftbsc/lll/mapper/data/MethodData.java
new file mode 100644
index 0000000..670ecd2
--- /dev/null
+++ b/src/main/java/ftbsc/lll/mapper/data/MethodData.java
@@ -0,0 +1,35 @@
+package ftbsc.lll.mapper.data;
+
+/**
+ * Container class for method data.
+ */
+public class MethodData {
+
+	/**
+	 * The internal name of the parent class.
+	 */
+	public final ClassData parentClass;
+
+	/**
+	 * The signature of the method.
+	 */
+	public final MethodSignature signature;
+
+	/**
+	 * The mapped name of the method.
+	 */
+	public final String nameMapped;
+
+	/**
+	 * Constructs a new {@link MethodData}.
+	 * @param parentClass the {@link ClassData} representation of the parent class
+	 * @param name the method name
+	 * @param nameMapped the mapped method name
+	 * @param descriptor the method's descriptor
+	 */
+	public MethodData(ClassData parentClass, String name, String nameMapped, String descriptor) {
+		this.parentClass = parentClass;
+		this.signature = new MethodSignature(name, descriptor);
+		this.nameMapped = nameMapped;
+	}
+}
diff --git a/src/main/java/ftbsc/lll/mapper/data/MethodSignature.java b/src/main/java/ftbsc/lll/mapper/data/MethodSignature.java
new file mode 100644
index 0000000..d7515a8
--- /dev/null
+++ b/src/main/java/ftbsc/lll/mapper/data/MethodSignature.java
@@ -0,0 +1,51 @@
+package ftbsc.lll.mapper.data;
+
+import java.util.Objects;
+
+/**
+ * Container class for method signature data.
+ */
+public class MethodSignature {
+	/**
+	 * The name of the method.
+	 */
+	public final String name;
+
+	/**
+	 * The descriptor of the method.
+	 */
+	public final String descriptor;
+
+	/**
+	 * Constructs a new {@link MethodSignature}. The parameters should be
+	 * either plain or obfuscated in the same way;
+	 * @param name       the method name
+	 * @param descriptor the method descriptor
+	 */
+	public MethodSignature(String name, String descriptor) {
+		this.name = name;
+		this.descriptor = descriptor;
+	}
+
+	/**
+	 * Checks if two {@link MethodSignature}s represent the same method.
+	 * @param o the other signature
+	 * @return whether they represent the same method
+	 */
+	@Override
+	public boolean equals(Object o) {
+		if(this == o) return true;
+		if(o == null || getClass() != o.getClass()) return false;
+		MethodSignature signature = (MethodSignature) o;
+		return Objects.equals(name, signature.name) && Objects.equals(descriptor, signature.descriptor);
+	}
+
+	/**
+	 * Calculates a hash based on name and descriptor.
+	 * @return the hash code
+	 */
+	@Override
+	public int hashCode() {
+		return Objects.hash(name, descriptor);
+	}
+}