--- /dev/null
+package org.apache.lucene.index;
+
+/**
+ * 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 java.io.Closeable;
+
+/** Abstract class for enumerating terms.
+
+ <p>Term enumerations are always ordered by Term.compareTo(). Each term in
+ the enumeration is greater than all that precede it. */
+
+public abstract class TermEnum implements Closeable {
+ /** Increments the enumeration to the next element. True if one exists.*/
+ public abstract boolean next() throws IOException;
+
+ /** Returns the current Term in the enumeration.*/
+ public abstract Term term();
+
+ /** Returns the docFreq of the current Term in the enumeration.*/
+ public abstract int docFreq();
+
+ /** Closes the enumeration to further activity, freeing resources. */
+ public abstract void close() throws IOException;
+}