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Provides common utility functions

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/*
 * Copyright (c) CQSE GmbH
 *
 * Licensed 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.conqat.lib.commons.filesystem;

import java.io.File;

import org.conqat.lib.commons.string.StringUtils;

/**
 * This is a file filter finding only "normal" files having one of the specified extensions.
 * 
 * @author Benjamin Hummel
 * @author Florian Deissenboeck
 */
public class FileExtensionFilter extends FileOnlyFilter {

	/** The extension to match. */
	private final String[] extensions;

	/**
	 * Creates a new file extension filter.
	 * 
	 * @param extensions
	 *            the extension required by the files (without the dot). Note that using an empty string
	 *            will not find all files without extension, but rather those ending in a single dot.
	 */
	public FileExtensionFilter(String... extensions) {
		this.extensions = new String[extensions.length];
		for (int i = 0; i < extensions.length; i++) {
			this.extensions[i] = "." + extensions[i];
		}
	}

	/** {@inheritDoc} */
	@Override
	public boolean accept(File file) {
		return super.accept(file) && StringUtils.endsWithOneOf(file.getName(), extensions);
	}
}