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annotate graal/com.oracle.max.base/src/com/sun/max/program/ClasspathTraversal.java @ 4138:82af018d61db

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Merge fixes.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 22:03:44 +0100
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.max.program;
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24
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25 import java.io.*;
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26 import java.util.*;
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27 import java.util.zip.*;
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28
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29 import com.sun.max.io.*;
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30 import com.sun.max.program.Classpath.*;
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31
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32 /**
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33 * Provides a facility for processing all the resources reachable on a given {@linkplain Classpath classpath}.
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34 */
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35 public class ClasspathTraversal {
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36
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37 /**
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38 * Handles a standard file resource encountered during the traversal.
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39 *
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40 * @param parent the classpath directory entry under which the resource is located
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41 * @param resource the path of the resource relative to {@code parent}. The
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42 * {@linkplain File#separatorChar platform specific} character is used as the path separator in this
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43 * value.
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44 * @return true if the traversal should continue, false if it should terminate
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45 */
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46 protected boolean visitFile(File parent, String resource) {
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47 return true;
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48 }
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49
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50 /**
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51 * Handles an archive entry resource encountered during the traversal.
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52 *
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53 * @param archive the classpath .zip or .jar entry in which the resource is located
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54 * @param resource the archive entry holding the resource
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55 * @return true if the traversal should continue, false if it should terminate
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56 */
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57 protected boolean visitArchiveEntry(ZipFile archive, ZipEntry resource) {
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58 return true;
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59 }
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60
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61 /**
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62 * Traverses all the resources reachable on a given classpath.
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63 *
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64 * @param classpath the classpath to search
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65 */
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66 public void run(final Classpath classpath) {
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67 run(classpath, null);
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68 }
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69
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70 /**
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71 * Traverses all the resources reachable on a given classpath.
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72 *
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73 * @param classpath the classpath to search
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74 * @param resourcePrefixFilter if non-null, then only resources whose name begins with this value are traversed. The
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75 * '/' character must be used in this value as the path separator regardless of the
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76 * {@linkplain File#separatorChar default} for the underlying platform.
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77 */
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78 public void run(final Classpath classpath, String resourcePrefixFilter) {
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79 for (final Entry entry : classpath.entries()) {
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80 if (entry.isDirectory()) {
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81 final String prefix = entry.path() + File.separator;
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82 final File startFile;
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83 if (resourcePrefixFilter == null) {
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84 startFile = entry.file();
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85 } else {
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86 if (File.separatorChar != '/') {
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87 startFile = new File(entry.file(), resourcePrefixFilter.replace('/', File.separatorChar));
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88 } else {
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89 startFile = new File(entry.file(), resourcePrefixFilter);
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90 }
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91 }
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92
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93 final FileTraversal fileTraversal = new FileTraversal() {
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94 @Override
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95 protected void visitFile(File file) {
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96 final String path = file.getPath();
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97 assert path.startsWith(prefix);
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98 final String resource = path.substring(prefix.length());
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99 if (!ClasspathTraversal.this.visitFile(entry.file(), resource)) {
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100 stop();
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101 }
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102 }
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103 };
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104 fileTraversal.run(startFile);
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105 if (fileTraversal.wasStopped()) {
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106 return;
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107 }
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108 } else if (entry.isArchive()) {
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109 final ZipFile zipFile = entry.zipFile();
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110 if (zipFile != null) {
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111 for (final Enumeration<? extends ZipEntry> e = zipFile.entries(); e.hasMoreElements();) {
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112 final ZipEntry zipEntry = e.nextElement();
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113 if (resourcePrefixFilter == null || zipEntry.getName().startsWith(resourcePrefixFilter)) {
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114 if (!visitArchiveEntry(zipFile, zipEntry)) {
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115 return;
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116 }
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117 }
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118 }
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119 }
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120 }
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121 }
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122 }
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123 }