001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.bcel.classfile;
020
021import java.io.DataInput;
022import java.io.DataOutputStream;
023import java.io.IOException;
024
025import org.apache.bcel.Const;
026
027/**
028 * This class is derived from the abstract {@link Constant} and represents a reference to an int object.
029 *
030 * @see Constant
031 */
032public final class ConstantInteger extends Constant implements ConstantObject {
033
034    private int bytes;
035
036    /**
037     * Initialize from another object.
038     *
039     * @param c Source to copy.
040     */
041    public ConstantInteger(final ConstantInteger c) {
042        this(c.getBytes());
043    }
044
045    /**
046     * Initialize instance from file data.
047     *
048     * @param file Input stream
049     * @throws IOException if an I/O error occurs.
050     */
051    ConstantInteger(final DataInput file) throws IOException {
052        this(file.readInt());
053    }
054
055    /**
056     * @param bytes Data
057     */
058    public ConstantInteger(final int bytes) {
059        super(Const.CONSTANT_Integer);
060        this.bytes = bytes;
061    }
062
063    /**
064     * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
065     * I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
066     *
067     * @param v Visitor object
068     */
069    @Override
070    public void accept(final Visitor v) {
071        v.visitConstantInteger(this);
072    }
073
074    /**
075     * Dump constant integer to file stream in binary format.
076     *
077     * @param file Output file stream
078     * @throws IOException if an I/O error occurs.
079     */
080    @Override
081    public void dump(final DataOutputStream file) throws IOException {
082        file.writeByte(super.getTag());
083        file.writeInt(bytes);
084    }
085
086    /**
087     * @return data, i.e., 4 bytes.
088     */
089    public int getBytes() {
090        return bytes;
091    }
092
093    /**
094     * @return Integer object
095     */
096    @Override
097    public Object getConstantValue(final ConstantPool cp) {
098        return Integer.valueOf(bytes);
099    }
100
101    /**
102     * @param bytes the raw bytes that represent this integer
103     */
104    public void setBytes(final int bytes) {
105        this.bytes = bytes;
106    }
107
108    /**
109     * @return String representation.
110     */
111    @Override
112    public String toString() {
113        return super.toString() + "(bytes = " + bytes + ")";
114    }
115}