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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);
}