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The source code

package org.apache.lucene.index;

/**
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed 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;

/** Abstract class for enumerating terms.

  

Term enumerations are always ordered by Term.compareTo(). Each term in the enumeration is greater than all that precede it. */ public abstract class TermEnum { /** 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; // Term Vector support /** Skips terms to the first beyond the current whose value is * greater or equal to target.

Returns true iff there is such * an entry.

Behaves as if written:

   *   public boolean skipTo(Term target) {
   *     do {
   *       if (!next())
   * 	     return false;
   *     } while (target > term());
   *     return true;
   *   }
   * 
* Some implementations are considerably more efficient than that. */ public boolean skipTo(Term target) throws IOException { do { if (!next()) return false; } while (target.compareTo(term()) > 0); return true; } }
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