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 */
017
018package org.apache.bcel.classfile;
019
020import java.io.DataInput;
021import java.io.DataOutputStream;
022import java.io.IOException;
023
024import org.apache.bcel.Const;
025
026/**
027 * This class represents a MethodParameters attribute.
028 *
029 * @see <a href="https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.24">
030 * The class File Format : The MethodParameters Attribute</a>
031 * @since 6.0
032 */
033public class MethodParameters extends Attribute {
034
035    private MethodParameter[] parameters = new MethodParameter[0];
036
037    MethodParameters(final int name_index, final int length, final DataInput input, final ConstantPool constant_pool) throws IOException {
038        super(Const.ATTR_METHOD_PARAMETERS, name_index, length, constant_pool);
039
040        final int parameters_count = input.readUnsignedByte();
041        parameters = new MethodParameter[parameters_count];
042        for (int i = 0; i < parameters_count; i++) {
043            parameters[i] = new MethodParameter(input);
044        }
045    }
046
047    public MethodParameter[] getParameters() {
048        return parameters;
049    }
050
051    public void setParameters(final MethodParameter[] parameters) {
052        this.parameters = parameters;
053    }
054
055    @Override
056    public void accept(final Visitor v) {
057        v.visitMethodParameters(this);
058    }
059
060    @Override
061    public Attribute copy(final ConstantPool _constant_pool) {
062        final MethodParameters c = (MethodParameters) clone();
063        c.parameters = new MethodParameter[parameters.length];
064
065        for (int i = 0; i < parameters.length; i++) {
066            c.parameters[i] = parameters[i].copy();
067        }
068        c.setConstantPool(_constant_pool);
069        return c;
070    }
071
072    /**
073     * Dump method parameters attribute to file stream in binary format.
074     *
075     * @param file Output file stream
076     * @throws IOException
077     */
078    @Override
079       public void dump(final DataOutputStream file) throws IOException {
080           super.dump(file);
081           file.writeByte(parameters.length);
082        for (final MethodParameter parameter : parameters) {
083            parameter.dump(file);
084        }
085    }
086}