--- /dev/null
+package org.apache.lucene.analysis.tokenattributes;
+
+/**
+ * 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.util.Attribute;
+
+/**
+ * The start and end character offset of a Token.
+ */
+public interface OffsetAttribute extends Attribute {
+ /** Returns this Token's starting offset, the position of the first character
+ corresponding to this token in the source text.
+
+ Note that the difference between endOffset() and startOffset() may not be
+ equal to termText.length(), as the term text may have been altered by a
+ stemmer or some other filter. */
+ public int startOffset();
+
+
+ /** Set the starting and ending offset.
+ @see #startOffset() and #endOffset()*/
+ public void setOffset(int startOffset, int endOffset);
+
+
+ /** Returns this Token's ending offset, one greater than the position of the
+ last character corresponding to this token in the source text. The length
+ of the token in the source text is (endOffset - startOffset). */
+ public int endOffset();
+}