ParameterAnnotationsAttributeEditor.java revision cfead78069f3dc32998dc118ee08cab3867acea2 
1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2011 Eric Lafortune (eric@graphics.cornell.edu)
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21package proguard.classfile.editor;
22
23import proguard.classfile.attribute.annotation.*;
24
25/**
26 * This class can add annotations to a given parameter annotations attribute.
27 * Annotations to be added must have been filled out beforehand.
28 *
29 * @author Eric Lafortune
30 */
31public class ParameterAnnotationsAttributeEditor
32{
33    private ParameterAnnotationsAttribute targetParameterAnnotationsAttribute;
34
35
36    /**
37     * Creates a new ParameterAnnotationsAttributeEditor that will edit
38     * annotations in the given parameter annotations attribute.
39     */
40    public ParameterAnnotationsAttributeEditor(ParameterAnnotationsAttribute targetParameterAnnotationsAttribute)
41    {
42        this.targetParameterAnnotationsAttribute = targetParameterAnnotationsAttribute;
43    }
44
45
46    /**
47     * Adds a given annotation to the annotations attribute.
48     */
49    public void addAnnotation(int parameterIndex, Annotation annotation)
50    {
51        int          annotationsCount = targetParameterAnnotationsAttribute.u2parameterAnnotationsCount[parameterIndex];
52        Annotation[] annotations      = targetParameterAnnotationsAttribute.parameterAnnotations[parameterIndex];
53
54        // Make sure there is enough space for the new annotation.
55        if (annotations == null ||
56            annotations.length <= annotationsCount)
57        {
58            targetParameterAnnotationsAttribute.parameterAnnotations[parameterIndex] = new Annotation[annotationsCount+1];
59            if (annotations != null)
60            {
61                System.arraycopy(annotations, 0,
62                                 targetParameterAnnotationsAttribute.parameterAnnotations[parameterIndex], 0,
63                                 annotationsCount);
64            }
65            annotations = targetParameterAnnotationsAttribute.parameterAnnotations[parameterIndex];
66        }
67
68        // Add the annotation.
69        annotations[targetParameterAnnotationsAttribute.u2parameterAnnotationsCount[parameterIndex]++] = annotation;
70    }
71}