| 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 apache@apache.org. |
| * |
| * 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 SegmentTermEnum extends TermEnum implements Cloneable { |
| private InputStream input; |
| private FieldInfos fieldInfos; |
| int size; |
| int position = -1; |
| |
| private Term term = new Term("", ""); |
| private TermInfo termInfo = new TermInfo(); |
| |
| boolean isIndex = false; |
| long indexPointer = 0; |
| Term prev; |
| |
| private char[] buffer = {}; |
| |
| SegmentTermEnum(InputStream i, FieldInfos fis, boolean isi) |
| throws IOException { |
| input = i; |
| fieldInfos = fis; |
| size = input.readInt(); |
| isIndex = isi; |
| } |
| |
| protected Object clone() { |
| SegmentTermEnum clone = null; |
| try { |
| clone = (SegmentTermEnum)super.clone(); |
| } catch (CloneNotSupportedException e) {} |
| |
| clone.input = (InputStream)input.clone(); |
| clone.termInfo = new TermInfo(termInfo); |
| clone.growBuffer(term.text.length()); |
| |
| return clone; |
| } |
| |
| final void seek(long pointer, int p, Term t, TermInfo ti) |
| throws IOException { |
| input.seek(pointer); |
| position = p; |
| term = t; |
| prev = null; |
| termInfo.set(ti); |
| growBuffer(term.text.length()); // copy term text into buffer |
| } |
| |
| /** Increments the enumeration to the next element. True if one exists.*/ |
| public final boolean next() throws IOException { |
| if (position++ >= size-1) { |
| term = null; |
| return false; |
| } |
| |
| prev = term; |
| term = readTerm(); |
| |
| termInfo.docFreq = input.readVInt(); // read doc freq |
| termInfo.freqPointer += input.readVLong(); // read freq pointer |
| termInfo.proxPointer += input.readVLong(); // read prox pointer |
| |
| if (isIndex) |
| indexPointer += input.readVLong(); // read index pointer |
| |
| return true; |
| } |
| |
| private final Term readTerm() throws IOException { |
| int start = input.readVInt(); |
| int length = input.readVInt(); |
| int totalLength = start + length; |
| if (buffer.length < totalLength) |
| growBuffer(totalLength); |
| |
| input.readChars(buffer, start, length); |
| return new Term(fieldInfos.fieldName(input.readVInt()), |
| new String(buffer, 0, totalLength), false); |
| } |
| |
| private final void growBuffer(int length) { |
| buffer = new char[length]; |
| for (int i = 0; i < term.text.length(); i++) // copy contents |
| buffer[i] = term.text.charAt(i); |
| } |
| |
| /** Returns the current Term in the enumeration. |
| Initially invalid, valid after next() called for the first time.*/ |
| public final Term term() { |
| return term; |
| } |
| |
| /** Returns the current TermInfo in the enumeration. |
| Initially invalid, valid after next() called for the first time.*/ |
| final TermInfo termInfo() { |
| return new TermInfo(termInfo); |
| } |
| |
| /** Sets the argument to the current TermInfo in the enumeration. |
| Initially invalid, valid after next() called for the first time.*/ |
| final void termInfo(TermInfo ti) { |
| ti.set(termInfo); |
| } |
| |
| /** Returns the docFreq from the current TermInfo in the enumeration. |
| Initially invalid, valid after next() called for the first time.*/ |
| public final int docFreq() { |
| return termInfo.docFreq; |
| } |
| |
| /* Returns the freqPointer from the current TermInfo in the enumeration. |
| Initially invalid, valid after next() called for the first time.*/ |
| final long freqPointer() { |
| return termInfo.freqPointer; |
| } |
| |
| /* Returns the proxPointer from the current TermInfo in the enumeration. |
| Initially invalid, valid after next() called for the first time.*/ |
| final long proxPointer() { |
| return termInfo.proxPointer; |
| } |
| |
| /** Closes the enumeration to further activity, freeing resources. */ |
| public final void close() throws IOException { |
| input.close(); |
| } |
| } |