134 lines
5.4 KiB
Java
134 lines
5.4 KiB
Java
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/*
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* Janino - An embedded Java[TM] compiler
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*
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* Copyright (c) 2001-2010, Arno Unkrig
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
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* following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
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* following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.codehaus.janino.util.iterator;
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import java.io.File;
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import java.io.FilenameFilter;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import org.codehaus.janino.JaninoRuntimeException;
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import org.codehaus.janino.util.Producer;
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/**
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* An {@link Iterator} that finds the normal {@link File}s who's names are
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* {@link FilenameFilter#accept(java.io.File, java.lang.String) accepted} by the
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* <code>fileNameFilter</code> and
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* <ul>
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* <li>
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* that exist in the given <code>rootDirectory</code>,
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* </li>
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* <li>
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* and those that exist in all subdirectories of the
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* <code>rootDirectory</code> who's names are
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* {@link FilenameFilter#accept(java.io.File, java.lang.String)}ed by the
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* <code>directoryNameFilter</code>
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* </li>
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* </ul>
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*/
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@SuppressWarnings({ "rawtypes", "unchecked" }) public
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class DirectoryIterator extends ProducerIterator<File> {
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public
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DirectoryIterator(
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final File rootDirectory,
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final FilenameFilter directoryNameFilter,
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final FilenameFilter fileNameFilter
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) {
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super(new Producer() {
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private final List<State> stateStack = DirectoryIterator.newArrayList(new State(rootDirectory));
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@Override public Object
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produce() {
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while (!this.stateStack.isEmpty()) {
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State state = (State) this.stateStack.get(this.stateStack.size() - 1);
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if (state.directories.hasNext()) {
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this.stateStack.add(new State((File) state.directories.next()));
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} else
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if (state.files.hasNext()) {
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File file = (File) state.files.next();
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return file;
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} else
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{
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this.stateStack.remove(this.stateStack.size() - 1);
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}
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}
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return null;
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}
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class State {
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State(File dir) {
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File[] entries = dir.listFiles();
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if (entries == null) {
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throw new JaninoRuntimeException("Directory \"" + dir + "\" could not be read");
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}
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List<File> directoryList = new ArrayList();
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List<File> fileList = new ArrayList();
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for (File entry : entries) {
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if (entry.isDirectory()) {
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if (directoryNameFilter.accept(dir, entry.getName())) directoryList.add(entry);
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} else
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if (entry.isFile()) {
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if (fileNameFilter.accept(dir, entry.getName())) fileList.add(entry);
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}
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}
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this.directories = directoryList.iterator();
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this.files = fileList.iterator();
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}
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final Iterator<File> directories;
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final Iterator<File> files;
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}
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});
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}
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/**
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* Create an {@link Iterator} that returns all matching {@link File}s locatable in a <i>set</i> of root
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* directories.
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*
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* @see #DirectoryIterator(File, FilenameFilter, FilenameFilter)
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*/
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public static Iterator<File>
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traverseDirectories(
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File[] rootDirectories,
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FilenameFilter directoryNameFilter,
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FilenameFilter fileNameFilter
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) {
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List<Iterator<File>> result = new ArrayList();
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for (File rootDirectory : rootDirectories) {
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result.add(new DirectoryIterator(rootDirectory, directoryNameFilter, fileNameFilter));
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}
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return new MultiDimensionalIterator(result.iterator(), 2);
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}
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private static ArrayList
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newArrayList(Object initialElement) {
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ArrayList result = new ArrayList();
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result.add(initialElement);
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return result;
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}
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}
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