/* * Copyright 2004-2010 Brian S O'Neill * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.cojen.classfile.attribute; import java.io.DataInput; import java.io.DataOutput; import java.io.IOException; import org.cojen.classfile.Attribute; import org.cojen.classfile.ConstantInfo; import org.cojen.classfile.ConstantPool; /** * This class corresponds to the ConstantValue_attribute structure as defined * in section 4.7.3 of <i>The Java Virtual Machine Specification</i>. * * @author Brian S O'Neill */ public class ConstantValueAttr extends Attribute { private final ConstantInfo mConstant; public ConstantValueAttr(ConstantPool cp, ConstantInfo constant) { super(cp, CONSTANT_VALUE); mConstant = constant; } public ConstantValueAttr(ConstantPool cp, String name, ConstantInfo constant) { super(cp, name); mConstant = constant; } public ConstantValueAttr(ConstantPool cp, String name, int length, DataInput din) throws IOException { super(cp, name); int index = din.readUnsignedShort(); if ((length -= 2) > 0) { din.skipBytes(length); } mConstant = cp.getConstant(index); } public ConstantInfo getConstant() { return mConstant; } public int getLength() { return 2; } public void writeDataTo(DataOutput dout) throws IOException { dout.writeShort(mConstant.getIndex()); } }