001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.flatfile.util;
018
019import java.io.InputStream;
020import java.lang.reflect.Constructor;
021
022import org.apache.commons.lang3.Validate;
023import org.apache.commons.lang3.reflect.ConstructorUtils;
024
025/**
026 * Basic FilterFactory that creates an instance of a given InputStream subclass with a (InputStream) constructor.
027 * @version $Revision: 1301244 $ $Date: 2012-03-15 17:16:23 -0500 (Thu, 15 Mar 2012) $
028 */
029public class BasicFilterFactory extends FilterFactory {
030    private static final long serialVersionUID = 9080292216759574895L;
031
032    private final Constructor<? extends InputStream> constructor;
033
034    /**
035     * Create a new BasicFilterFactory instance.
036     * @param type (Filter)InputStream type to instantiate.
037     */
038    public BasicFilterFactory(Class<? extends InputStream> type) {
039        Validate.isAssignableFrom(InputStream.class, type);
040        this.constructor =
041            Validate.notNull(ConstructorUtils.getAccessibleConstructor(type,
042                InputStream.class), String.format(
043                "Constructor %s(%s) not found", type.getName(),
044                InputStream.class.getName()));
045    }
046
047    /**
048     * {@inheritDoc}
049     */
050    protected InputStream iGetFilter(InputStream markIsSupported) {
051        try {
052            return constructor.newInstance(markIsSupported);
053        } catch (RuntimeException e) {
054            throw e;
055        } catch (Exception e) {
056            throw new RuntimeException(e);
057        }
058    }
059}