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/**
 * Copyright (c) 2014, Sindice Limited. All Rights Reserved.
 *
 * This file is part of the SIREn project.
 *
 * SIREn is a free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * SIREn is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with this program. If not, see .
 */

package com.sindicetech.siren.search.node;

import java.io.IOException;

import com.sindicetech.siren.index.DocsNodesAndPositionsEnum;
import com.sindicetech.siren.index.PositionsIterator;

/**
 * Maps the current position of a {@link DocsNodesAndPositionsEnum} to a
 * position relative to the offset of the term in the phrase.
 */
class NodePhrasePosition {

  /**
   * Current position
   * 

* Sentinel value is equal to {@link Integer.MIN_VALUE} since a position can * be negative. */ int pos = Integer.MIN_VALUE; final int offset; // position in phrase private final DocsNodesAndPositionsEnum docsEnum; // stream of positions protected NodePhrasePosition next; // used to make lists NodePhrasePosition(final DocsNodesAndPositionsEnum docsEnum, final int offset) { this.docsEnum = docsEnum; this.offset = offset; } void init() throws IOException { pos = Integer.MIN_VALUE; } /** * Go to next location of this term current document, and set * position as location - offset, so that a * matching exact phrase is easily identified when all NodePhrasePositions * have exactly the same position. */ public final boolean nextPosition() throws IOException { if (docsEnum.nextPosition()) { // read subsequent pos's pos = docsEnum.pos() - offset; return true; } else { pos = PositionsIterator.NO_MORE_POS; return false; } } @Override public String toString() { return "NodePhrasePositions(d:"+docsEnum.doc()+" n:"+docsEnum.node()+" o:"+offset+" p:"+pos+")"; } }





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