taverna-credential-manager-ui/src/main/java/org/apache/taverna/workbench/ui/credentialmanager/CryptoFileFilter.java

/*
* 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.taverna.workbench.ui.credentialmanager;

import java.io.File;
import java.util.Arrays;
import java.util.List;

import javax.swing.filechooser.FileFilter;

/**
 * File filter for filtering against various file extensions. Crypto files
 * normally contain a private key (and optionally its certificate chain) or a
 * public key certificate (and optionally its certificate chain).
 * 
 * .p12 or .pfx are PKCS #12 keystore files containing private key and its
 * public key (+cert chain); .pem are ASN.1 PEM-encoded files containing one (or
 * more concatenated) public key certificate(s); .der are ASN.1 DER-encoded
 * files containing one public key certificate; .cer are CER-encoded files
 * containing one ore more DER-encoded certificates; .crt files are either
 * encoded as binary DER or as ASCII PEM. .p7 and .p7c are PKCS #7 certificate
 * chain files (i.e. SignedData structure without data, just certificate(s)).
 */
public class CryptoFileFilter extends FileFilter {
	// Description of the filter
	private String description;

	// Array of file extensions to filter against
	private List<String> exts;

	public CryptoFileFilter(String[] extList, String desc) {
		exts = Arrays.asList(extList);
		this.description = desc;
	}

	@Override
	public boolean accept(File file) {
		if (file.isDirectory())
			return true;
		if (file.isFile())
			for (String ext : exts)
				if (file.getName().toLowerCase().endsWith(ext))
					return true;
		return false;
	}

	public void setDescription(String desc) {
		this.description = desc;
	}

	@Override
	public String getDescription() {
		return this.description;
	}
}