feat: implemented abstraction logic

1 files changed, 117 insertions, 0 deletions

diff --git a/src/main/java/ftbsc/lll/mapper/tools/data/ClassData.java b/src/main/java/ftbsc/lll/mapper/tools/data/ClassData.java
new file mode 100644
index 0000000..5ae4124
--- /dev/null
+++ b/src/main/java/ftbsc/lll/mapper/tools/data/ClassData.java
@@ -0,0 +1,117 @@
+package ftbsc.lll.mapper.tools.data;
+
+import ftbsc.lll.exceptions.MappingNotFoundException;
+import ftbsc.lll.mapper.IMapper;
+import ftbsc.lll.mapper.tools.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));
+	}
+
+	/**
+	 * 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
+	 */
+	public ClassData generateReverseMappings(IMapper mapper) {
+		ClassData reverse = new ClassData(this.nameMapped, this.name);
+		this.methods.forEach((signature, data) -> reverse.addMethod(nameMapped, signature.name,
+			MappingUtils.obfuscateMethodDescriptor(signature.descriptor, mapper)));
+		this.fields.forEach((name, data) -> reverse.addField(data.nameMapped, name));
+		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;
+	}
+}
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