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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/* *******************************************************************
 * Copyright (c) 2004, 2013 IBM, VMware
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * Contributors:
 *     Andy Clement -     initial implementation {date}
 * ******************************************************************/

package org.aspectj.apache.bcel.classfile.annotation;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import org.aspectj.apache.bcel.classfile.ConstantPool;

public abstract class ElementValue {

	public static final int STRING = 's';
	public static final int ENUM_CONSTANT = 'e';
	public static final int CLASS = 'c';
	public static final int ANNOTATION = '@';
	public static final int ARRAY = '[';

	public static final int PRIMITIVE_INT = 'I';
	public static final int PRIMITIVE_BYTE = 'B';
	public static final int PRIMITIVE_CHAR = 'C';
	public static final int PRIMITIVE_DOUBLE = 'D';
	public static final int PRIMITIVE_FLOAT = 'F';
	public static final int PRIMITIVE_LONG = 'J';
	public static final int PRIMITIVE_SHORT = 'S';
	public static final int PRIMITIVE_BOOLEAN = 'Z';

	protected int type;
	protected ConstantPool cpool;

	protected ElementValue(int type, ConstantPool cpool) {
		this.type = type;
		this.cpool = cpool;
	}

	public int getElementValueType() {
		return type;
	}

	public abstract String stringifyValue();

	public abstract void dump(DataOutputStream dos) throws IOException;

	public static ElementValue readElementValue(DataInputStream dis, ConstantPool cpGen) throws IOException {
		int type = dis.readUnsignedByte();
		switch (type) {
		case 'B': // byte
			return new SimpleElementValue(PRIMITIVE_BYTE, dis.readUnsignedShort(), cpGen);
		case 'C': // char
			return new SimpleElementValue(PRIMITIVE_CHAR, dis.readUnsignedShort(), cpGen);
		case 'D': // double
			return new SimpleElementValue(PRIMITIVE_DOUBLE, dis.readUnsignedShort(), cpGen);
		case 'F': // float
			return new SimpleElementValue(PRIMITIVE_FLOAT, dis.readUnsignedShort(), cpGen);
		case 'I': // int
			return new SimpleElementValue(PRIMITIVE_INT, dis.readUnsignedShort(), cpGen);
		case 'J': // long
			return new SimpleElementValue(PRIMITIVE_LONG, dis.readUnsignedShort(), cpGen);
		case 'S': // short
			return new SimpleElementValue(PRIMITIVE_SHORT, dis.readUnsignedShort(), cpGen);
		case 'Z': // boolean
			return new SimpleElementValue(PRIMITIVE_BOOLEAN, dis.readUnsignedShort(), cpGen);
		case 's': // String
			return new SimpleElementValue(STRING, dis.readUnsignedShort(), cpGen);

		case 'e': // Enum constant
			return new EnumElementValue(dis.readUnsignedShort(), dis.readUnsignedShort(), cpGen);

		case 'c': // Class
			return new ClassElementValue(dis.readUnsignedShort(), cpGen);

			// FIXME should this be true here? or should it be the value for the containing annotation?
		case '@': // Annotation
			return new AnnotationElementValue(ANNOTATION, AnnotationGen.read(dis, cpGen, true), cpGen);

		case '[': // Array
			int numArrayVals = dis.readUnsignedShort();
			ElementValue[] evalues = new ElementValue[numArrayVals];
			for (int j = 0; j < numArrayVals; j++) {
				evalues[j] = ElementValue.readElementValue(dis, cpGen);
			}
			return new ArrayElementValue(ARRAY, evalues, cpGen);

		default:
			throw new RuntimeException("Unexpected element value kind in annotation: " + type);
		}
	}

	protected ConstantPool getConstantPool() {
		return cpool;
	}

	/**
	 * Creates an (modifiable) ElementValueGen copy of an (immutable) ElementValue - constant pool is assumed correct.
	 */
	public static ElementValue copy(ElementValue value, ConstantPool cpool, boolean copyPoolEntries) {
		switch (value.getElementValueType()) {
		case 'B': // byte
		case 'C': // char
		case 'D': // double
		case 'F': // float
		case 'I': // int
		case 'J': // long
		case 'S': // short
		case 'Z': // boolean
		case 's': // String
			return new SimpleElementValue((SimpleElementValue) value, cpool, copyPoolEntries);

		case 'e': // Enum constant
			return new EnumElementValue((EnumElementValue) value, cpool, copyPoolEntries);

		case '@': // Annotation
			return new AnnotationElementValue((AnnotationElementValue) value, cpool, copyPoolEntries);

		case '[': // Array
			return new ArrayElementValue((ArrayElementValue) value, cpool, copyPoolEntries);

		case 'c': // Class
			return new ClassElementValue((ClassElementValue) value, cpool, copyPoolEntries);

		default:
			throw new RuntimeException("Not implemented yet! (" + value.getElementValueType() + ")");
		}
	}
}