pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/miscellaneous/SingleTokenTokenStream.java b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/miscellaneous/SingleTokenTokenStream.java
new file mode 100644 (file)
index 0000000..8a40136
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+++ b/lucene-java-3.5.0/lucene/contrib/analyzers/common/src/java/org/apache/lucene/analysis/miscellaneous/SingleTokenTokenStream.java
@@ -0,0 +1,72 @@
+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 java.io.IOException;
+
+import org.apache.lucene.util.AttributeImpl;
+import org.apache.lucene.analysis.Token;
+import org.apache.lucene.analysis.TokenStream;
+import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
+
+/**
+ * A {@link TokenStream} containing a single token.
+ */
+public final class SingleTokenTokenStream extends TokenStream {
+
+  private boolean exhausted = false;
+  
+  // The token needs to be immutable, so work with clones!
+  private Token singleToken;
+  private final AttributeImpl tokenAtt;
+
+  public SingleTokenTokenStream(Token token) {
+    super(Token.TOKEN_ATTRIBUTE_FACTORY);
+    
+    assert token != null;
+    this.singleToken = (Token) token.clone();
+    
+    tokenAtt = (AttributeImpl) addAttribute(CharTermAttribute.class);
+    assert (tokenAtt instanceof Token);
+  }
+
+  @Override
+  public final boolean incrementToken() throws IOException {
+    if (exhausted) {
+      return false;
+    } else {
+      clearAttributes();
+      singleToken.copyTo(tokenAtt);
+      exhausted = true;
+      return true;
+    }
+  }
+
+  @Override
+  public void reset() throws IOException {
+    exhausted = false;
+  }
+
+  public Token getToken() {
+    return (Token) singleToken.clone();
+  }
+
+  public void setToken(Token token) {
+    this.singleToken = (Token) token.clone();
+  }
+}