pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/WildcardQuery.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/WildcardQuery.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 org.apache.lucene.index.IndexReader;
+import org.apache.lucene.index.Term;
+import org.apache.lucene.util.ToStringUtils;
+
+import java.io.IOException;
+
+/** Implements the wildcard search query. Supported wildcards are <code>*</code>, which
+ * matches any character sequence (including the empty one), and <code>?</code>,
+ * which matches any single character. Note this query can be slow, as it
+ * needs to iterate over many terms. In order to prevent extremely slow WildcardQueries,
+ * a Wildcard term should not start with one of the wildcards <code>*</code> or
+ * <code>?</code>.
+ * 
+ * <p>This query uses the {@link
+ * MultiTermQuery#CONSTANT_SCORE_AUTO_REWRITE_DEFAULT}
+ * rewrite method.
+ *
+ * @see WildcardTermEnum */
+public class WildcardQuery extends MultiTermQuery {
+  private boolean termContainsWildcard;
+  private boolean termIsPrefix;
+  protected Term term;
+    
+  public WildcardQuery(Term term) {
+    this.term = term;
+    String text = term.text();
+    this.termContainsWildcard = (text.indexOf('*') != -1)
+        || (text.indexOf('?') != -1);
+    this.termIsPrefix = termContainsWildcard 
+        && (text.indexOf('?') == -1) 
+        && (text.indexOf('*') == text.length() - 1);
+  }
+
+  @Override
+  protected FilteredTermEnum getEnum(IndexReader reader) throws IOException {
+    if (termIsPrefix) {
+      return new PrefixTermEnum(reader, term.createTerm(term.text()
+          .substring(0, term.text().indexOf('*')))); 
+    } else if (termContainsWildcard) {
+      return new WildcardTermEnum(reader, getTerm());
+    } else {
+      return new SingleTermEnum(reader, getTerm());
+    }
+  }
+  
+  /**
+   * Returns the pattern term.
+   */
+  public Term getTerm() {
+    return term;
+  }
+  
+  /** Prints a user-readable version of this query. */
+  @Override
+  public String toString(String field) {
+    StringBuilder buffer = new StringBuilder();
+    if (!term.field().equals(field)) {
+      buffer.append(term.field());
+      buffer.append(":");
+    }
+    buffer.append(term.text());
+    buffer.append(ToStringUtils.boost(getBoost()));
+    return buffer.toString();
+  }
+
+  @Override
+  public int hashCode() {
+    final int prime = 31;
+    int result = super.hashCode();
+    result = prime * result + ((term == null) ? 0 : term.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;
+    WildcardQuery other = (WildcardQuery) obj;
+    if (term == null) {
+      if (other.term != null)
+        return false;
+    } else if (!term.equals(other.term))
+      return false;
+    return true;
+  }
+
+}