/* * 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; import java.io.DataOutput; import java.io.IOException; /** * This class corresponds to the cp_info structure as defined in * section 4.4 of <i>The Java Virtual Machine Specification</i>. * Subclasses should override the default hashCode and equals methods so * that the ConstantPool will only contain one instance of this constant. * * @author Brian S O'Neill */ public abstract class ConstantInfo { public static final int TAG_UTF8 = 1; public static final int TAG_INTEGER = 3; public static final int TAG_FLOAT = 4; public static final int TAG_LONG = 5; public static final int TAG_DOUBLE = 6; public static final int TAG_CLASS = 7; public static final int TAG_STRING = 8; public static final int TAG_FIELD = 9; public static final int TAG_METHOD = 10; public static final int TAG_INTERFACE_METHOD = 11; public static final int TAG_NAME_AND_TYPE = 12; // mIndex is manipulated by ConstantPool int mIndex = -1; private int mTag; protected ConstantInfo(int tag) { mTag = tag; } /** * The index of this constant in the constant pool. Is -1 if the * index has not yet been resolved. Constant pool indexes are resolved * when the constant pool is written out. */ public int getIndex() { return mIndex; } protected boolean hasPriority() { return false; } protected int getEntryCount() { return 1; } public void writeTo(DataOutput dout) throws IOException { dout.writeByte(mTag); } }