org.codehaus.groovy.ant.FileIterator Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.codehaus.groovy.ant;
import org.apache.tools.ant.DirectoryScanner;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.types.FileSet;
import java.io.File;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* FileIterator is an iterator over a
* number of files from a collection of FileSet instances.
*/
public class FileIterator implements Iterator {
/* The iterator over the FileSet objects */
private final Iterator fileSetIterator;
/* The Ant project */
private final Project project;
/* The directory scanner */
private DirectoryScanner ds;
/* The file names in the current FileSet scan */
private String[] files;
/* The current index into the file name array */
private int fileIndex = -1;
/* The next File object we'll iterate over */
private File nextFile;
/* Have we set a next object? */
private boolean nextObjectSet = false;
/* Return only directories? */
private final boolean iterateDirectories;
public FileIterator(Project project, Iterator fileSetIterator) {
this(project, fileSetIterator, false);
}
public FileIterator(Project project, Iterator fileSetIterator, boolean iterateDirectories) {
this.project = project;
this.fileSetIterator = fileSetIterator;
this.iterateDirectories = iterateDirectories;
}
// Iterator interface
//-------------------------------------------------------------------------
/**
* @return true if there is another object that matches the given predicate
*/
public boolean hasNext() {
if (nextObjectSet) {
return true;
} else {
return setNextObject();
}
}
/**
* @return the next object which matches the given predicate
*/
public Object next() {
if (!nextObjectSet) {
if (!setNextObject()) {
throw new NoSuchElementException();
}
}
nextObjectSet = false;
return nextFile;
}
/**
* throws UnsupportedOperationException
*/
public void remove() {
throw new UnsupportedOperationException();
}
// Implementation methods
//-------------------------------------------------------------------------
/*
* Set nextObject to the next object. If there are no more
* objects then return false. Otherwise, return true.
*/
private boolean setNextObject() {
while (true) {
while (ds == null) {
if (!fileSetIterator.hasNext()) {
return false;
}
FileSet fs = fileSetIterator.next();
ds = fs.getDirectoryScanner(project);
ds.scan();
if (iterateDirectories) {
files = ds.getIncludedDirectories();
} else {
files = ds.getIncludedFiles();
}
if (files.length > 0) {
fileIndex = -1;
break;
} else {
ds = null;
}
}
if (ds != null && files != null) {
if (++fileIndex < files.length) {
nextFile = new File(ds.getBasedir(), files[fileIndex]);
nextObjectSet = true;
return true;
} else {
ds = null;
}
}
}
}
}