pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / src / java / org / apache / lucene / analysis / LimitTokenCountAnalyzer.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/analysis/LimitTokenCountAnalyzer.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/analysis/LimitTokenCountAnalyzer.java
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+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/analysis/LimitTokenCountAnalyzer.java
@@ -0,0 +1,69 @@
+package org.apache.lucene.analysis;
+
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+import org.apache.lucene.document.Fieldable;
+
+import java.io.Reader;
+import java.io.IOException;
+
+/**
+ * This Analyzer limits the number of tokens while indexing. It is
+ * a replacement for the maximum field length setting inside {@link org.apache.lucene.index.IndexWriter}.
+ */
+public final class LimitTokenCountAnalyzer extends Analyzer {
+  private final Analyzer delegate;
+  private final int maxTokenCount;
+
+  /**
+   * Build an analyzer that limits the maximum number of tokens per field.
+   */
+  public LimitTokenCountAnalyzer(Analyzer delegate, int maxTokenCount) {
+    this.delegate = delegate;
+    this.maxTokenCount = maxTokenCount;
+  }
+  
+  @Override
+  public TokenStream tokenStream(String fieldName, Reader reader) {
+    return new LimitTokenCountFilter(
+      delegate.tokenStream(fieldName, reader), maxTokenCount
+    );
+  }
+  
+  @Override
+  public TokenStream reusableTokenStream(String fieldName, Reader reader) throws IOException {
+    return new LimitTokenCountFilter(
+      delegate.reusableTokenStream(fieldName, reader), maxTokenCount
+    );
+  }
+  
+  @Override
+  public int getPositionIncrementGap(String fieldName) {
+    return delegate.getPositionIncrementGap(fieldName);
+  }
+
+  @Override
+  public int getOffsetGap(Fieldable field) {
+    return delegate.getOffsetGap(field);
+  }
+  
+  @Override
+  public String toString() {
+    return "LimitTokenCountAnalyzer(" + delegate.toString() + ", maxTokenCount=" + maxTokenCount + ")";
+  }
+}