001/** 
002 * Copyright (c) 2009, Regents of the University of Colorado 
003 * All rights reserved.
004 * 
005 * Redistribution and use in source and binary forms, with or without
006 * modification, are permitted provided that the following conditions are met:
007 * 
008 * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 
009 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 
010 * Neither the name of the University of Colorado at Boulder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. 
011 * 
012 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
013 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
014 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
015 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
016 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
017 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
018 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
019 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
020 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
021 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
022 * POSSIBILITY OF SUCH DAMAGE. 
023 */
024package org.cleartk.ml.encoder.features;
025
026import java.util.ArrayList;
027import java.util.List;
028
029import org.cleartk.ml.Feature;
030import org.cleartk.ml.encoder.CleartkEncoderException;
031
032/**
033 * <br>
034 * Copyright (c) 2009, Regents of the University of Colorado <br>
035 * All rights reserved.
036 * 
037 * @author Philipp Wetzler
038 */
039public class FeatureEncoderChain<ENCODED_TYPE> implements FeatureEncoder<ENCODED_TYPE> {
040
041  private static final long serialVersionUID = -3363875258541749972L;
042
043  public void addEncoder(FeatureEncoder<ENCODED_TYPE> encoder) {
044    featureEncoders.add(encoder);
045  }
046
047  public List<ENCODED_TYPE> encode(Feature feature) throws CleartkEncoderException {
048    for (FeatureEncoder<ENCODED_TYPE> featureEncoder : featureEncoders) {
049      if (featureEncoder.encodes(feature))
050        return featureEncoder.encode(feature);
051    }
052
053    throw CleartkEncoderException.noMatchingEncoder(feature, featureEncoders);
054  }
055
056  public boolean encodes(Feature feature) {
057    for (FeatureEncoder<ENCODED_TYPE> encoder : featureEncoders)
058      if (encoder.encodes(feature))
059        return true;
060
061    return false;
062  }
063
064  protected List<FeatureEncoder<ENCODED_TYPE>> featureEncoders = new ArrayList<FeatureEncoder<ENCODED_TYPE>>();
065
066}