opennlp-coref/src/main/java/opennlp/tools/formats/muc/MucCorefSampleStream.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 opennlp.tools.formats.muc;

import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;

import opennlp.tools.tokenize.Tokenizer;
import opennlp.tools.util.FilterObjectStream;
import opennlp.tools.util.ObjectStream;

public class MucCorefSampleStream extends FilterObjectStream<String, RawCorefSample> {

  private final Tokenizer tokenizer;
  
  private List<RawCorefSample> documents = new ArrayList<RawCorefSample>();
  
  public MucCorefSampleStream(Tokenizer tokenizer, ObjectStream<String> documents) {
    super(new DocumentSplitterStream(documents));
    this.tokenizer = tokenizer;
  }

  public RawCorefSample read() throws IOException {
    
    if (documents.isEmpty()) {
      
      String document = samples.read();
      
      if (document != null) {
        new SgmlParser().parse(new StringReader(document),
            new MucCorefContentHandler(tokenizer, documents));
      }
    }
    
    if (documents.size() > 0) {
      return documents.remove(0);
    }
    else {
      return null;
    }
  }
}