/*
* 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() {
}
}