pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / highlighter / src / java / org / apache / lucene / search / vectorhighlight / BreakIteratorBoundaryScanner.java

diff --git a/lucene-java-3.5.0/lucene/contrib/highlighter/src/java/org/apache/lucene/search/vectorhighlight/BreakIteratorBoundaryScanner.java b/lucene-java-3.5.0/lucene/contrib/highlighter/src/java/org/apache/lucene/search/vectorhighlight/BreakIteratorBoundaryScanner.java
new file mode 100644 (file)
index 0000000..518a472
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+++ b/lucene-java-3.5.0/lucene/contrib/highlighter/src/java/org/apache/lucene/search/vectorhighlight/BreakIteratorBoundaryScanner.java
@@ -0,0 +1,49 @@
+package org.apache.lucene.search.vectorhighlight;
+
+/**
+ * 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.text.BreakIterator;
+
+/**
+ * A {@link BoundaryScanner} implementation that uses {@link BreakIterator} to find
+ * boundaries in the text.
+ * @see BreakIterator
+ */
+public class BreakIteratorBoundaryScanner implements BoundaryScanner {
+  
+  final BreakIterator bi;
+
+  public BreakIteratorBoundaryScanner(BreakIterator bi){
+    this.bi = bi;
+  }
+
+  public int findStartOffset(StringBuilder buffer, int start) {
+    // avoid illegal start offset
+    if( start > buffer.length() || start < 1 ) return start;
+    bi.setText(buffer.substring(0, start));
+    bi.last();
+    return bi.previous();
+  }
+
+  public int findEndOffset(StringBuilder buffer, int start) {
+    // avoid illegal start offset
+    if( start > buffer.length() || start < 0 ) return start;
+    bi.setText(buffer.substring(start));
+    return bi.next() + start;
+  }
+}