Ant example source code file (FileResourceIterator.java)

This example Ant source code file (FileResourceIterator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Ant tags/keywords

file, fileresource, fileresource, fileresourceiterator, fileresourceiterator, io, iterator, nosuchelementexception, object, object, string, string, unsupportedoperationexception, util

The FileResourceIterator.java source code

/*
 *  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.apache.tools.ant.types.resources;

import java.io.File;
import java.util.Iterator;
import java.util.NoSuchElementException;

/**
 * Iterator of FileResources from filenames.
 * @since Ant 1.7
 */
public class FileResourceIterator implements Iterator {
    private File basedir;
    private String[] files;
    private int pos = 0;

    /**
     * Construct a new FileResourceIterator.
     */
    public FileResourceIterator() {
    }

    /**
     * Construct a new FileResourceIterator relative to the specified
     * base directory.
     * @param f the base directory of this instance.
     */
    public FileResourceIterator(File f) {
        basedir = f;
    }

    /**
     * Construct a new FileResourceIterator over the specified filenames,
     * relative to the specified base directory.
     * @param f the base directory of this instance.
     * @param s the String[] of filenames.
     */
    public FileResourceIterator(File f, String[] s) {
        this(f);
        addFiles(s);
    }

    /**
     * Add an array of filenames to this FileResourceIterator.
     * @param s the filenames to add.
     */
    public void addFiles(String[] s) {
        int start = (files == null) ? 0 : files.length;
        String[] newfiles = new String[start + s.length];
        if (start > 0) {
            System.arraycopy(files, 0, newfiles, 0, start);
        }
        files = newfiles;
        System.arraycopy(s, 0, files, start, s.length);
    }

    /**
     * Find out whether this FileResourceIterator has more elements.
     * @return whether there are more Resources to iterate over.
     */
    public boolean hasNext() {
        return pos < files.length;
    }

    /**
     * Get the next element from this FileResourceIterator.
     * @return the next Object.
     */
    public Object next() {
        return nextResource();
    }

    /**
     * Not implemented.
     */
    public void remove() {
        throw new UnsupportedOperationException();
    }

    /**
     * Convenience method to return the next resource.
     * @return the next File.
     */
    public FileResource nextResource() {
        if (!hasNext()) {
            throw new NoSuchElementException();
        }
        return new FileResource(basedir, files[pos++]);
    }

}