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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

There is a newer version: 9.1.6

/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * 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 proguard.classfile.constant;

import proguard.classfile.Clazz;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.util.SimpleProcessable;

/**
 * This abstract class represents an entry in the constant pool of a class.
 * Specific types of entries are subclassed from it.
 *
 * @author Eric Lafortune
 */
public abstract class Constant extends SimpleProcessable
{
    public static final int UTF8                = 1;
    public static final int INTEGER             = 3;
    public static final int FLOAT               = 4;
    public static final int LONG                = 5;
    public static final int DOUBLE              = 6;
    public static final int CLASS               = 7;
    public static final int STRING              = 8;
    public static final int FIELDREF            = 9;
    public static final int METHODREF           = 10;
    public static final int INTERFACE_METHODREF = 11;
    public static final int NAME_AND_TYPE       = 12;
    public static final int METHOD_HANDLE       = 15;
    public static final int METHOD_TYPE         = 16;
    public static final int DYNAMIC             = 17;
    public static final int INVOKE_DYNAMIC      = 18;
    public static final int MODULE              = 19;
    public static final int PACKAGE             = 20;

    public static final int PRIMITIVE_ARRAY     = 99;


    //public int  u1tag;
    //public byte info[];

    // Abstract methods to be implemented by extensions.

    /**
     * Returns the constant pool info tag that specifies the entry type.
     */
    public abstract int getTag();


    /**
     * Returns whether the constant is of category 2. This means that it takes
     * up the space of two category 1 types in the constant pool or on the
     * stack, for instance.
     */
    public abstract boolean isCategory2();


    /**
     * Accepts the given visitor.
     */
    public abstract void accept(Clazz clazz, ConstantVisitor constantVisitor);
}