pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/analysis/LengthFilter.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/analysis/LengthFilter.java
new file mode 100644 (file)
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+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/analysis/LengthFilter.java
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+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 java.io.IOException;
+
+import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
+
+/**
+ * Removes words that are too long or too short from the stream.
+ * <p>
+ * Note: Length is calculated as the number of UTF-16 code units.
+ * </p>
+ */
+public final class LengthFilter extends FilteringTokenFilter {
+
+  private final int min;
+  private final int max;
+  
+  private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
+
+  /**
+   * Build a filter that removes words that are too long or too
+   * short from the text.
+   */
+  public LengthFilter(boolean enablePositionIncrements, TokenStream in, int min, int max) {
+    super(enablePositionIncrements, in);
+    this.min = min;
+    this.max = max;
+  }
+  
+  /**
+   * Build a filter that removes words that are too long or too
+   * short from the text.
+   * @deprecated Use {@link #LengthFilter(boolean, TokenStream, int, int)} instead.
+   */
+  @Deprecated
+  public LengthFilter(TokenStream in, int min, int max) {
+    this(false, in, min, max);
+  }
+  
+  @Override
+  public boolean accept() throws IOException {
+    final int len = termAtt.length();
+    return (len >= min && len <= max);
+  }
+}