Mercurial > hg > truffle
diff graal/com.oracle.max.base/src/com/sun/max/program/ClasspathTraversal.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.max.base/src/com/sun/max/program/ClasspathTraversal.java Sat Dec 17 19:59:18 2011 +0100 @@ -0,0 +1,123 @@ +/* + * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ +package com.sun.max.program; + +import java.io.*; +import java.util.*; +import java.util.zip.*; + +import com.sun.max.io.*; +import com.sun.max.program.Classpath.*; + +/** + * Provides a facility for processing all the resources reachable on a given {@linkplain Classpath classpath}. + */ +public class ClasspathTraversal { + + /** + * Handles a standard file resource encountered during the traversal. + * + * @param parent the classpath directory entry under which the resource is located + * @param resource the path of the resource relative to {@code parent}. The + * {@linkplain File#separatorChar platform specific} character is used as the path separator in this + * value. + * @return true if the traversal should continue, false if it should terminate + */ + protected boolean visitFile(File parent, String resource) { + return true; + } + + /** + * Handles an archive entry resource encountered during the traversal. + * + * @param archive the classpath .zip or .jar entry in which the resource is located + * @param resource the archive entry holding the resource + * @return true if the traversal should continue, false if it should terminate + */ + protected boolean visitArchiveEntry(ZipFile archive, ZipEntry resource) { + return true; + } + + /** + * Traverses all the resources reachable on a given classpath. + * + * @param classpath the classpath to search + */ + public void run(final Classpath classpath) { + run(classpath, null); + } + + /** + * Traverses all the resources reachable on a given classpath. + * + * @param classpath the classpath to search + * @param resourcePrefixFilter if non-null, then only resources whose name begins with this value are traversed. The + * '/' character must be used in this value as the path separator regardless of the + * {@linkplain File#separatorChar default} for the underlying platform. + */ + public void run(final Classpath classpath, String resourcePrefixFilter) { + for (final Entry entry : classpath.entries()) { + if (entry.isDirectory()) { + final String prefix = entry.path() + File.separator; + final File startFile; + if (resourcePrefixFilter == null) { + startFile = entry.file(); + } else { + if (File.separatorChar != '/') { + startFile = new File(entry.file(), resourcePrefixFilter.replace('/', File.separatorChar)); + } else { + startFile = new File(entry.file(), resourcePrefixFilter); + } + } + + final FileTraversal fileTraversal = new FileTraversal() { + @Override + protected void visitFile(File file) { + final String path = file.getPath(); + assert path.startsWith(prefix); + final String resource = path.substring(prefix.length()); + if (!ClasspathTraversal.this.visitFile(entry.file(), resource)) { + stop(); + } + } + }; + fileTraversal.run(startFile); + if (fileTraversal.wasStopped()) { + return; + } + } else if (entry.isArchive()) { + final ZipFile zipFile = entry.zipFile(); + if (zipFile != null) { + for (final Enumeration<? extends ZipEntry> e = zipFile.entries(); e.hasMoreElements();) { + final ZipEntry zipEntry = e.nextElement(); + if (resourcePrefixFilter == null || zipEntry.getName().startsWith(resourcePrefixFilter)) { + if (!visitArchiveEntry(zipFile, zipEntry)) { + return; + } + } + } + } + } + } + } +}