    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     * Constructs a ConstantInteger.
    057     *
    058     * @param bytes Data.
    059     */
    060    public ConstantInteger(final int bytes) {
    061        super(Const.CONSTANT_Integer);
    062        this.bytes = bytes;
    063    }
    064
    065    /**
    066     * Called by objects that are traversing the nodes of the tree implicitly defined by the contents of a Java class.
    067     * I.e., the hierarchy of methods, fields, attributes, etc. spawns a tree of objects.
    068     *
    069     * @param v Visitor object.
    070     */
    071    @Override
    072    public void accept(final Visitor v) {
    073        v.visitConstantInteger(this);
    074    }
    075
    076    /**
    077     * Dumps constant integer to file stream in binary format.
    078     *
    079     * @param file Output file stream.
    080     * @throws IOException if an I/O error occurs.
    081     */
    082    @Override
    083    public void dump(final DataOutputStream file) throws IOException {
    084        file.writeByte(super.getTag());
    085        file.writeInt(bytes);
    086    }
    087
    088    /**
    089     * Gets the data.
    090     *
    091     * @return data, that is, 4 bytes.
    092     */
    093    public int getBytes() {
    094        return bytes;
    095    }
    096
    097    /**
    098     * Gets the Integer object.
    099     *
    100     * @param cp the constant pool (not used).
    101     * @return Integer object.
    102     */
    103    @Override
    104    public Object getConstantValue(final ConstantPool cp) {
    105        return Integer.valueOf(bytes);
    106    }
    107
    108    /**
    109     * Sets the raw bytes that represent the integer value.
    110     *
    111     * @param bytes the raw bytes that represent the integer value.
    112     */
    113    public void setBytes(final int bytes) {
    114        this.bytes = bytes;
    115    }
    116
    117    /**
    118     * @return String representation.
    119     */
    120    @Override
    121    public String toString() {
    122        return super.toString() + "(bytes = " + bytes + ")";
    123    }
    124}