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LUCENE-6033: CachingTokenFilter now uses ArrayList not LinkedList, and has new isCached() method

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git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1638794 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
David Wayne Smiley 2014-11-12 13:58:09 +00:00
parent e698180451
commit a38cb51906
2 changed files with 14 additions and 5 deletions
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3
lucene/CHANGES.txt
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@ -302,6 +302,9 @@ Optimizations
* LUCENE-6040: Speed up EliasFanoDocIdSet through broadword bit selection.
(Paul Elschot)
* LUCENE-6033: CachingTokenFilter now uses ArrayList not LinkedList, and has new
isCached() method. (David Smiley)
Build
* LUCENE-5909: Smoke tester now has better command line parsing and

16
lucene/core/src/java/org/apache/lucene/analysis/CachingTokenFilter.java
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@ -18,8 +18,8 @@ package org.apache.lucene.analysis;
*/
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.apache.lucene.util.AttributeSource;
@ -27,7 +27,8 @@ import org.apache.lucene.util.AttributeSource;
/**
* This class can be used if the token attributes of a TokenStream
* are intended to be consumed more than once. It caches
* all token attribute states locally in a List.
* all token attribute states locally in a List when the first call to
* {@link #incrementToken()} is called.
*
* <P>CachingTokenFilter implements the optional method
* {@link TokenStream#reset()}, which repositions the
@ -51,7 +52,7 @@ public final class CachingTokenFilter extends TokenFilter {
public final boolean incrementToken() throws IOException {
if (cache == null) {
// fill cache lazily
cache = new LinkedList<>();
cache = new ArrayList<>(64);
fillCache();
iterator = cache.iterator();
}
@ -81,13 +82,13 @@ public final class CachingTokenFilter extends TokenFilter {
*/
@Override
public void reset() {
if(cache != null) {
if (cache != null) {
iterator = cache.iterator();
}
}
private void fillCache() throws IOException {
while(input.incrementToken()) {
while (input.incrementToken()) {
cache.add(captureState());
}
// capture final state
@ -95,4 +96,9 @@ public final class CachingTokenFilter extends TokenFilter {
finalState = captureState();
}
/** If the underlying token stream was consumed and cached. */
public boolean isCached() {
return cache != null;
}
}