/*
* Copyright (C) 2014 Indeed Inc.
*
* Licensed 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 com.indeed.flamdex.simple;
import com.google.common.base.Charsets;
import com.indeed.flamdex.api.RawStringTermDocIterator;
import org.apache.log4j.Logger;
import java.io.IOException;
/**
* @author jplaisance
*/
public final class NativeStringTermDocIterator extends NativeTermDocIterator implements RawStringTermDocIterator {
private static final Logger log = Logger.getLogger(NativeStringTermDocIterator.class);
private final SimpleStringTermIterator termIterator;
private byte[] buffer = new byte[4096];
private int[] lengths = new int[128];
private int bufferLength = 0;
private int index = 0;
private int position = 0;
private int size = 0;
private byte[] currentTermBuffer = new byte[128];
public NativeStringTermDocIterator(SimpleStringTermIterator termIterator, MapCache mapCache)
throws IOException {
super(termIterator.getFilename(), mapCache);
this.termIterator = termIterator;
}
@Override
protected boolean bufferNext() {
if (!termIterator.next()) return false;
final int termLength = termIterator.termStringLength();
if (bufferLength + termLength > buffer.length) {
final byte[] newBuffer = new byte[Math.max(buffer.length*2, bufferLength + termLength)];
System.arraycopy(buffer, 0, newBuffer, 0, bufferLength);
buffer = newBuffer;
}
if (size >= lengths.length) {
final int[] newLengths = new int[lengths.length*2];
System.arraycopy(lengths, 0, newLengths, 0, size);
lengths = newLengths;
}
lengths[size] = termLength;
System.arraycopy(termIterator.termStringBytes(), 0, buffer, bufferLength, termLength);
if (size == 0) {
if (termLength > currentTermBuffer.length) {
currentTermBuffer = new byte[Math.max(currentTermBuffer.length*2, termLength)];
}
System.arraycopy(termIterator.termStringBytes(), 0, currentTermBuffer, 0, termLength);
position = termLength;
}
size++;
bufferLength+=termLength;
return true;
}
@Override
protected long offset() {
return termIterator.getOffset();
}
@Override
protected int lastDocFreq() {
return termIterator.docFreq();
}
@Override
protected void poll() {
size--;
index++;
if (size == 0) {
index = 0;
position = 0;
bufferLength = 0;
} else {
if (lengths[index] > currentTermBuffer.length) {
currentTermBuffer = new byte[Math.max(currentTermBuffer.length*2, lengths[index])];
}
System.arraycopy(buffer, position, currentTermBuffer, 0, lengths[index]);
position+=lengths[index];
}
}
@Override
public String term() {
return new String(currentTermBuffer, 0, lengths[index], Charsets.UTF_8);
}
@Override
public byte[] termStringBytes() {
return currentTermBuffer;
}
@Override
public int termStringLength() {
return lengths[index];
}
@Override
public void close() {
super.close();
termIterator.close();
}
}