/*
* Janino - An embedded Java[TM] compiler
*
* Copyright (c) 2001-2010, Arno Unkrig
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
* following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package org.codehaus.janino.util.iterator;
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.codehaus.janino.JaninoRuntimeException;
import org.codehaus.janino.util.Producer;
/**
* An {@link Iterator} that finds the normal {@link File}s who's names are
* {@link FilenameFilter#accept(java.io.File, java.lang.String) accepted} by the
* <code>fileNameFilter</code> and
* <ul>
* <li>
* that exist in the given <code>rootDirectory</code>,
* </li>
* <li>
* and those that exist in all subdirectories of the
* <code>rootDirectory</code> who's names are
* {@link FilenameFilter#accept(java.io.File, java.lang.String)}ed by the
* <code>directoryNameFilter</code>
* </li>
* </ul>
*/
public class DirectoryIterator extends ProducerIterator {
public DirectoryIterator(
final File rootDirectory,
final FilenameFilter directoryNameFilter,
final FilenameFilter fileNameFilter
) {
super(new Producer() {
private final List stateStack = DirectoryIterator.newArrayList(new State(rootDirectory));
public Object produce() {
while (!this.stateStack.isEmpty()) {
State state = (State) this.stateStack.get(this.stateStack.size() - 1);
if (state.directories.hasNext()) {
this.stateStack.add(new State((File) state.directories.next()));
} else
if (state.files.hasNext()) {
return (File) state.files.next();
} else
{
this.stateStack.remove(this.stateStack.size() - 1);
}
}
return null;
}
class State {
State(File dir) {
File[] entries = dir.listFiles();
if (entries == null) {
throw new JaninoRuntimeException("Directory \"" + dir + "\" could not be read");
}
List directoryList = new ArrayList();
List fileList = new ArrayList();
for (int i = 0; i < entries.length; ++i) {
File entry = entries[i];
if (entry.isDirectory()) {
if (directoryNameFilter.accept(dir, entry.getName())) directoryList.add(entry);
} else
if (entry.isFile()) {
if (fileNameFilter.accept(dir, entry.getName())) fileList.add(entry);
}
}
this.directories = directoryList.iterator();
this.files = fileList.iterator();
}
final Iterator directories; // File
final Iterator files; // File
}
});
}
/**
* Create an {@link Iterator} that returns all matching
* {@link File}s locatable in a <i>set</i> of root directories.
*
* @see #DirectoryIterator(File, FilenameFilter, FilenameFilter)
*/
public static Iterator traverseDirectories(
File[] rootDirectories,
FilenameFilter directoryNameFilter,
FilenameFilter fileNameFilter
) {
List result = new ArrayList();
for (int i = 0; i < rootDirectories.length; ++i) {
result.add(new DirectoryIterator(rootDirectories[i], directoryNameFilter, fileNameFilter));
}
return new MultiDimensionalIterator(result.iterator(), 2);
}
private static ArrayList newArrayList(Object initialElement) {
ArrayList result = new ArrayList();
result.add(initialElement);
return result;
}
}