pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / analyzers / common / src / java / org / apache / lucene / analysis / miscellaneous / PrefixAndSuffixAwareTokenFilter.java

diff --git a/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/miscellaneous/PrefixAndSuffixAwareTokenFilter.java b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/miscellaneous/PrefixAndSuffixAwareTokenFilter.java
new file mode 100644 (file)
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+++ b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/miscellaneous/PrefixAndSuffixAwareTokenFilter.java
@@ -0,0 +1,84 @@
+package org.apache.lucene.analysis.miscellaneous;
+
+/**
+ * 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.analysis.Token;
+import org.apache.lucene.analysis.TokenStream;
+
+import java.io.IOException;
+
+/**
+ * Links two {@link PrefixAwareTokenFilter}.
+ * <p/>
+ * <b>NOTE:</b> This filter might not behave correctly if used with custom Attributes, i.e. Attributes other than
+ * the ones located in org.apache.lucene.analysis.tokenattributes. 
+ */
+public class PrefixAndSuffixAwareTokenFilter extends TokenStream {
+
+  private PrefixAwareTokenFilter suffix;
+
+  public PrefixAndSuffixAwareTokenFilter(TokenStream prefix, TokenStream input, TokenStream suffix) {
+    super(suffix);
+    prefix = new PrefixAwareTokenFilter(prefix, input) {
+      @Override
+      public Token updateSuffixToken(Token suffixToken, Token lastInputToken) {
+        return PrefixAndSuffixAwareTokenFilter.this.updateInputToken(suffixToken, lastInputToken);
+      }
+    };
+    this.suffix = new PrefixAwareTokenFilter(prefix, suffix) {
+      @Override
+      public Token updateSuffixToken(Token suffixToken, Token lastInputToken) {
+        return PrefixAndSuffixAwareTokenFilter.this.updateSuffixToken(suffixToken, lastInputToken);
+      }
+    };
+  }
+
+  public Token updateInputToken(Token inputToken, Token lastPrefixToken) {
+    inputToken.setStartOffset(lastPrefixToken.endOffset() + inputToken.startOffset());
+    inputToken.setEndOffset(lastPrefixToken.endOffset() + inputToken.endOffset());
+    return inputToken;
+  }
+
+  public Token updateSuffixToken(Token suffixToken, Token lastInputToken) {
+    suffixToken.setStartOffset(lastInputToken.endOffset() + suffixToken.startOffset());
+    suffixToken.setEndOffset(lastInputToken.endOffset() + suffixToken.endOffset());
+    return suffixToken;
+  }
+
+
+  @Override
+  public final boolean incrementToken() throws IOException {
+    return suffix.incrementToken();
+  }
+
+  @Override
+  public void reset() throws IOException {
+    suffix.reset();
+  }
+
+
+  @Override
+  public void close() throws IOException {
+    suffix.close();
+  }
+
+  @Override
+  public void end() throws IOException {
+    suffix.end();
+  }
+}