pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/contrib/highlighter/src/java/org/apache/lucene/search/vectorhighlight/SimpleBoundaryScanner.java b/lucene-java-3.5.0/lucene/contrib/highlighter/src/java/org/apache/lucene/search/vectorhighlight/SimpleBoundaryScanner.java
new file mode 100644 (file)
index 0000000..bbfb1df
--- /dev/null
+++ b/lucene-java-3.5.0/lucene/contrib/highlighter/src/java/org/apache/lucene/search/vectorhighlight/SimpleBoundaryScanner.java
@@ -0,0 +1,81 @@
+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.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+public class SimpleBoundaryScanner implements BoundaryScanner {
+  
+  public static final int DEFAULT_MAX_SCAN = 20;
+  public static final Character[] DEFAULT_BOUNDARY_CHARS = {'.', ',', '!', '?', ' ', '\t', '\n'};
+
+  protected int maxScan;
+  protected Set<Character> boundaryChars;
+  
+  public SimpleBoundaryScanner(){
+    this( DEFAULT_MAX_SCAN, DEFAULT_BOUNDARY_CHARS );
+  }
+  
+  public SimpleBoundaryScanner( int maxScan ){
+    this( maxScan, DEFAULT_BOUNDARY_CHARS );
+  }
+  
+  public SimpleBoundaryScanner( Character[] boundaryChars ){
+    this( DEFAULT_MAX_SCAN, boundaryChars );
+  }
+  
+  public SimpleBoundaryScanner( int maxScan, Character[] boundaryChars ){
+    this.maxScan = maxScan;
+    this.boundaryChars = new HashSet<Character>();
+    this.boundaryChars.addAll(Arrays.asList(boundaryChars));
+  }
+  
+  public SimpleBoundaryScanner( int maxScan, Set<Character> boundaryChars ){
+    this.maxScan = maxScan;
+    this.boundaryChars = boundaryChars;
+  }
+
+  public int findStartOffset(StringBuilder buffer, int start) {
+    // avoid illegal start offset
+    if( start > buffer.length() || start < 1 ) return start;
+    int offset, count = maxScan;
+    for( offset = start; offset > 0 && count > 0; count-- ){
+      // found?
+      if( boundaryChars.contains( buffer.charAt( offset - 1 ) ) ) return offset;
+      offset--;
+    }
+    // not found
+    return start;
+  }
+
+  public int findEndOffset(StringBuilder buffer, int start) {
+    // avoid illegal start offset
+    if( start > buffer.length() || start < 0 ) return start;
+    int offset, count = maxScan;
+    //for( offset = start; offset <= buffer.length() && count > 0; count-- ){
+    for( offset = start; offset < buffer.length() && count > 0; count-- ){
+      // found?
+      if( boundaryChars.contains( buffer.charAt( offset ) ) ) return offset;
+      offset++;
+    }
+    // not found
+    return start;
+  }
+}