org.aspectj.apache.bcel.classfile.annotation.AnnotationGen Maven / Gradle / Ivy

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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 Corporation
 *
 * 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
 * ******************************************************************/
package org.aspectj.apache.bcel.classfile.annotation;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.aspectj.apache.bcel.classfile.ConstantPool;
import org.aspectj.apache.bcel.classfile.ConstantUtf8;
import org.aspectj.apache.bcel.classfile.Utility;
import org.aspectj.apache.bcel.generic.ObjectType;

public class AnnotationGen {
	public static final AnnotationGen[] NO_ANNOTATIONS = new AnnotationGen[0];

	private int typeIndex;
	private List pairs = Collections.emptyList();
	private ConstantPool cpool;
	private boolean isRuntimeVisible = false;

	public AnnotationGen(AnnotationGen a, ConstantPool cpool, boolean copyPoolEntries) {
		this.cpool = cpool;
		if (copyPoolEntries) {
			typeIndex = cpool.addUtf8(a.getTypeSignature());
		} else {
			typeIndex = a.getTypeIndex();
		}
		isRuntimeVisible = a.isRuntimeVisible();
		pairs = copyValues(a.getValues(), cpool, copyPoolEntries);
	}

	private List copyValues(List in, ConstantPool cpool, boolean copyPoolEntries) {
		List out = new ArrayList<>();
		for (NameValuePair nvp : in) {
			out.add(new NameValuePair(nvp, cpool, copyPoolEntries));
		}
		return out;
	}

	private AnnotationGen(ConstantPool cpool) {
		this.cpool = cpool;
	}

	/**
	 * Retrieve an immutable version of this AnnotationGen
	 */
	public AnnotationGen(ObjectType type, List pairs, boolean runtimeVisible, ConstantPool cpool) {
		this.cpool = cpool;
		if (type != null) {
			this.typeIndex = cpool.addUtf8(type.getSignature()); // Only null for funky *temporary* FakeAnnotation objects
		}
		this.pairs = pairs;
		isRuntimeVisible = runtimeVisible;
	}

	public static AnnotationGen read(DataInputStream dis, ConstantPool cpool, boolean b) throws IOException {
		AnnotationGen a = new AnnotationGen(cpool);
		a.typeIndex = dis.readUnsignedShort();
		int elemValuePairCount = dis.readUnsignedShort();
		for (int i = 0; i < elemValuePairCount; i++) {
			int nidx = dis.readUnsignedShort();
			a.addElementNameValuePair(new NameValuePair(nidx, ElementValue.readElementValue(dis, cpool), cpool));
		}
		a.isRuntimeVisible(b);
		return a;
	}

	public void dump(DataOutputStream dos) throws IOException {
		dos.writeShort(typeIndex); // u2 index of type name in cpool
		dos.writeShort(pairs.size()); // u2 element_value pair count
		for (NameValuePair envp : pairs) {
			envp.dump(dos);
		}
	}

	public void addElementNameValuePair(NameValuePair evp) {
		if (pairs == Collections.EMPTY_LIST) {
			pairs = new ArrayList<>();
		}
		pairs.add(evp);
	}

	public int getTypeIndex() {
		return typeIndex;
	}

	public String getTypeSignature() {
		ConstantUtf8 utf8 = (ConstantUtf8) cpool.getConstant(typeIndex);
		return utf8.getValue();
	}

	public String getTypeName() {
		return Utility.signatureToString(getTypeSignature());
	}

	public List getValues() {
		return pairs;
	}

	@Override
	public String toString() {
		StringBuilder s = new StringBuilder();
		s.append("AnnotationGen:[" + getTypeName() + " #" + pairs.size() + " {");
		for (int i = 0; i < pairs.size(); i++) {
			s.append(pairs.get(i));
			if (i + 1 < pairs.size())
				s.append(",");
		}
		s.append("}]");
		return s.toString();
	}

	public String toShortString() {
		StringBuilder s = new StringBuilder();
		s.append("@").append(getTypeName());
		if (pairs.size()!=0) {
			s.append("(");
			for (int i = 0; i < pairs.size(); i++) {
				s.append(pairs.get(i));
				if (i + 1 < pairs.size())
					s.append(",");
			}
			s.append(")");
		}
		return s.toString();
	}

	private void isRuntimeVisible(boolean b) {
		isRuntimeVisible = b;
	}

	public boolean isRuntimeVisible() {
		return isRuntimeVisible;
	}

	/**
	 * @return true if the annotation has a value with the specified name and (toString'd) value
	 */
	public boolean hasNameValuePair(String name, String value) {
		for (NameValuePair pair : pairs) {
			if (pair.getNameString().equals(name)) {
				if (pair.getValue().stringifyValue().equals(value)) {
					return true;
				}
			}
		}
		return false;
	}

	/**
	 * @return true if the annotation has a value with the specified name
	 */
	public boolean hasNamedValue(String name) {
		for (NameValuePair pair : pairs) {
			if (pair.getNameString().equals(name)) {
				return true;
			}
		}
		return false;
	}
}