segmenttermpositions.java

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package org.apache.lucene.index;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache Lucene" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache Lucene", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

import java.io.IOException;

import org.apache.lucene.store.InputStream;

final class SegmentTermPositions
extends SegmentTermDocs implements TermPositions {
  private InputStream proxStream;
  private int proxCount;
  private int position;
  
  SegmentTermPositions(SegmentReader p) throws IOException {
    super(p);
    this.proxStream = (InputStream)parent.proxStream.clone();
  }

  final void seek(TermInfo ti) throws IOException {
    super.seek(ti);
    if (ti != null)
      proxStream.seek(ti.proxPointer);
    else
      proxCount = 0;
  }

  public final void close() throws IOException {
    super.close();
    proxStream.close();
  }

  public final int nextPosition() throws IOException {
    proxCount--;
    return position += proxStream.readVInt();
  }

  protected final void skippingDoc() throws IOException {
    for (int f = freq; f > 0; f--)		  // skip all positions
      proxStream.readVInt();
  }

  public final boolean next() throws IOException {
    for (int f = proxCount; f > 0; f--)		  // skip unread positions
      proxStream.readVInt();

    if (super.next()) {				  // run super
      proxCount = freq;				  // note frequency
      position = 0;				  // reset position
      return true;
    }
    return false;
  }

  public final int read(final int[] docs, final int[] freqs)
      throws IOException {
    throw new RuntimeException();
  }
}