pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / queryparser / src / java / org / apache / lucene / queryParser / surround / query / BasicQueryFactory.java

diff --git a/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/surround/query/BasicQueryFactory.java b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/surround/query/BasicQueryFactory.java
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+package org.apache.lucene.queryParser.surround.query;
+/**
+ * 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.
+ */
+
+/* Create basic queries to be used during rewrite.
+ * The basic queries are TermQuery and SpanTermQuery.
+ * An exception can be thrown when too many of these are used.
+ * SpanTermQuery and TermQuery use IndexReader.termEnum(Term), which causes the buffer usage.
+ *
+ * Use this class to limit the buffer usage for reading terms from an index.
+ * Default is 1024, the same as the max. number of subqueries for a BooleanQuery.
+ */
+ 
+import org.apache.lucene.index.Term;
+import org.apache.lucene.search.TermQuery;
+import org.apache.lucene.search.spans.SpanTermQuery;
+
+public class BasicQueryFactory {
+  public BasicQueryFactory(int maxBasicQueries) {
+    this.maxBasicQueries = maxBasicQueries;
+    this.queriesMade = 0;
+  }
+  
+  public BasicQueryFactory() {
+    this(1024);
+  }
+  
+  private int maxBasicQueries;
+  private int queriesMade;
+  
+  public int getNrQueriesMade() {return queriesMade;}
+  public int getMaxBasicQueries() {return maxBasicQueries;}
+  
+  private synchronized void checkMax() throws TooManyBasicQueries {
+    if (queriesMade >= maxBasicQueries)
+      throw new TooManyBasicQueries(getMaxBasicQueries());
+    queriesMade++;
+  }
+  
+  public TermQuery newTermQuery(Term term) throws TooManyBasicQueries {
+    checkMax();
+    return new TermQuery(term);
+  }
+  
+  public SpanTermQuery newSpanTermQuery(Term term) throws TooManyBasicQueries {
+    checkMax();
+    return new SpanTermQuery(term);
+  }
+}
+
+