pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / src / java / org / apache / lucene / search / PrefixTermEnum.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/PrefixTermEnum.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/PrefixTermEnum.java
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+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/PrefixTermEnum.java
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+package org.apache.lucene.search;
+
+/**
+ * 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 org.apache.lucene.index.IndexReader;
+import org.apache.lucene.index.Term;
+
+/**
+ * Subclass of FilteredTermEnum for enumerating all terms that match the
+ * specified prefix filter term.
+ * <p>
+ * Term enumerations are always ordered by Term.compareTo().  Each term in
+ * the enumeration is greater than all that precede it.
+ *
+ */
+public class PrefixTermEnum extends FilteredTermEnum {
+
+  private final Term prefix;
+  private boolean endEnum = false;
+
+  public PrefixTermEnum(IndexReader reader, Term prefix) throws IOException {
+    this.prefix = prefix;
+
+    setEnum(reader.terms(new Term(prefix.field(), prefix.text())));
+  }
+
+  @Override
+  public float difference() {
+    return 1.0f;
+  }
+
+  @Override
+  protected boolean endEnum() {
+    return endEnum;
+  }
+  
+  protected Term getPrefixTerm() {
+      return prefix;
+  }
+
+  @Override
+  protected boolean termCompare(Term term) {
+    if (term.field() == prefix.field() && term.text().startsWith(prefix.text())) {                                                                              
+      return true;
+    }
+    endEnum = true;
+    return false;
+  }
+}