org.apache.mahout.utils.vectors.io.DelimitedTermInfoWriter.java Source code

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Here is the source code for org.apache.mahout.utils.vectors.io.DelimitedTermInfoWriter.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.mahout.utils.vectors.io;

import java.io.IOException;
import java.io.Writer;
import java.util.Iterator;

import com.google.common.io.Closeables;
import org.apache.mahout.utils.vectors.TermEntry;
import org.apache.mahout.utils.vectors.TermInfo;

/**
 * Write {@link TermInfo} to a {@link Writer} in a textual, delimited format with header.
 */
public class DelimitedTermInfoWriter implements TermInfoWriter {

    private final Writer writer;
    private final String delimiter;
    private final String field;

    public DelimitedTermInfoWriter(Writer writer, String delimiter, String field) {
        this.writer = writer;
        this.delimiter = delimiter;
        this.field = field;
    }

    @Override
    public void write(TermInfo ti) throws IOException {

        Iterator<TermEntry> entIter = ti.getAllEntries();
        try {
            writer.write(String.valueOf(ti.totalTerms(field)));
            writer.write('\n');
            writer.write("#term" + delimiter + "doc freq" + delimiter + "idx");
            writer.write('\n');
            while (entIter.hasNext()) {
                TermEntry entry = entIter.next();
                writer.write(entry.getTerm());
                writer.write(delimiter);
                writer.write(String.valueOf(entry.getDocFreq()));
                writer.write(delimiter);
                writer.write(String.valueOf(entry.getTermIdx()));
                writer.write('\n');
            }
        } finally {
            Closeables.close(writer, false);
        }
    }

    /**
     * Does NOT close the underlying writer
     */
    @Override
    public void close() {

    }
}