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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   */
17  
18  package org.apache.bcel.classfile;
19  
20  import java.io.DataInput;
21  import java.io.DataOutputStream;
22  import java.io.IOException;
23  
24  import org.apache.bcel.Const;
25  
26  /**
27   * This class represents a MethodParameters attribute.
28   *
29   * @see <a href="http://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.24">
30   * The class File Format : The MethodParameters Attribute</a>
31   * @since 6.0
32   */
33  public class MethodParameters extends Attribute {
34  
35      private MethodParameter[] parameters = new MethodParameter[0];
36  
37      MethodParameters(final int name_index, final int length, final DataInput input, final ConstantPool constant_pool) throws IOException {
38          super(Const.ATTR_METHOD_PARAMETERS, name_index, length, constant_pool);
39  
40          final int parameters_count = input.readUnsignedByte();
41          parameters = new MethodParameter[parameters_count];
42          for (int i = 0; i < parameters_count; i++) {
43              parameters[i] = new MethodParameter(input);
44          }
45      }
46  
47      public MethodParameter[] getParameters() {
48          return parameters;
49      }
50  
51      public void setParameters(final MethodParameter[] parameters) {
52          this.parameters = parameters;
53      }
54  
55      @Override
56      public void accept(final Visitor v) {
57          v.visitMethodParameters(this);
58      }
59  
60      @Override
61      public Attribute copy(final ConstantPool _constant_pool) {
62          final MethodParameters c = (MethodParameters) clone();
63          c.parameters = new MethodParameter[parameters.length];
64  
65          for (int i = 0; i < parameters.length; i++) {
66              c.parameters[i] = parameters[i].copy();
67          }
68          c.setConstantPool(_constant_pool);
69          return c;
70      }
71  
72      /**
73       * Dump method parameters attribute to file stream in binary format.
74       *
75       * @param file Output file stream
76       * @throws IOException
77       */
78      @Override
79         public void dump(final DataOutputStream file) throws IOException {
80             super.dump(file);
81             file.writeByte(parameters.length);
82          for (final MethodParameter parameter : parameters) {
83              parameter.dump(file);
84          }
85      }
86  }