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