org.apache.uima.lucas.indexer.test.util.DummyTokenStream.java Source code

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Here is the source code for org.apache.uima.lucas.indexer.test.util.DummyTokenStream.java

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/*
 * 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.uima.lucas.indexer.test.util;

import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
import org.apache.lucene.analysis.tokenattributes.TermAttribute;

import java.io.IOException;

public class DummyTokenStream extends TokenStream {
    private int count = 0;
    private String tokenValue;
    private int distance;
    private int number;
    private int begin;
    private int end;
    private int offset;
    private boolean firstToken = true;
    private OffsetAttribute offsetAtt;
    private TermAttribute termAtt;

    public DummyTokenStream(String tokenValue, int distance, int number, int offset) {
        this.tokenValue = tokenValue;
        this.distance = distance;
        this.number = number;
        this.offset = offset;

        if (offset > 0) {
            count = offset;
            begin = count * (tokenValue.length() + 1);
            end = count * (tokenValue.length() + 1) + tokenValue.length();
        } else {
            begin = 0;
            end = tokenValue.length();
        }
        // set initial attributes
        offsetAtt = (OffsetAttribute) addAttribute(OffsetAttribute.class);
        offsetAtt.setOffset(begin, end);
        termAtt = (TermAttribute) addAttribute(TermAttribute.class);
        termAtt.setTermBuffer(tokenValue);
    }

    @Override
    public boolean incrementToken() throws IOException {
        if (number <= count / distance)
            return false;
        // for the first token just return the initial values
        if (firstToken) {
            firstToken = false;
            return true;
        }

        count += distance;

        begin += distance * (tokenValue.length() + 1);
        end += distance * (tokenValue.length() + 1);
        offsetAtt.setOffset(begin, end);

        return begin < (offset * (tokenValue.length() + 1) + (number - 1) * distance * (tokenValue.length() + 1)
                + tokenValue.length());
    }

    public String toString() {
        return "tokenValue: " + tokenValue + ", distance: " + distance + ", number: " + number + ", offset: "
                + offset;
    }

}