pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/PrefixQuery.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/PrefixQuery.java
new file mode 100644 (file)
index 0000000..0b67177
--- /dev/null
+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/PrefixQuery.java
@@ -0,0 +1,87 @@
+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;
+import org.apache.lucene.util.ToStringUtils;
+
+/** A Query that matches documents containing terms with a specified prefix. A PrefixQuery
+ * is built by QueryParser for input like <code>app*</code>.
+ *
+ * <p>This query uses the {@link
+ * MultiTermQuery#CONSTANT_SCORE_AUTO_REWRITE_DEFAULT}
+ * rewrite method. */
+public class PrefixQuery extends MultiTermQuery {
+  private Term prefix;
+
+  /** Constructs a query for terms starting with <code>prefix</code>. */
+  public PrefixQuery(Term prefix) {
+    this.prefix = prefix;
+  }
+
+  /** Returns the prefix of this query. */
+  public Term getPrefix() { return prefix; }
+  
+  @Override
+  protected FilteredTermEnum getEnum(IndexReader reader) throws IOException {
+    return new PrefixTermEnum(reader, prefix);
+  }
+
+  /** Prints a user-readable version of this query. */
+  @Override
+  public String toString(String field) {
+    StringBuilder buffer = new StringBuilder();
+    if (!prefix.field().equals(field)) {
+      buffer.append(prefix.field());
+      buffer.append(":");
+    }
+    buffer.append(prefix.text());
+    buffer.append('*');
+    buffer.append(ToStringUtils.boost(getBoost()));
+    return buffer.toString();
+  }
+
+  @Override
+  public int hashCode() {
+    final int prime = 31;
+    int result = super.hashCode();
+    result = prime * result + ((prefix == null) ? 0 : prefix.hashCode());
+    return result;
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj)
+      return true;
+    if (!super.equals(obj))
+      return false;
+    if (getClass() != obj.getClass())
+      return false;
+    PrefixQuery other = (PrefixQuery) obj;
+    if (prefix == null) {
+      if (other.prefix != null)
+        return false;
+    } else if (!prefix.equals(other.prefix))
+      return false;
+    return true;
+  }
+
+}