pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / queryparser / src / java / org / apache / lucene / queryParser / standard / processors / DefaultPhraseSlopQueryNodeProcessor.java

diff --git a/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/standard/processors/DefaultPhraseSlopQueryNodeProcessor.java b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/standard/processors/DefaultPhraseSlopQueryNodeProcessor.java
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+++ b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/standard/processors/DefaultPhraseSlopQueryNodeProcessor.java
@@ -0,0 +1,118 @@
+package org.apache.lucene.queryParser.standard.processors;
+
+/**
+ * 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.util.List;
+
+import org.apache.lucene.queryParser.core.QueryNodeException;
+import org.apache.lucene.queryParser.core.config.QueryConfigHandler;
+import org.apache.lucene.queryParser.core.nodes.QueryNode;
+import org.apache.lucene.queryParser.core.nodes.SlopQueryNode;
+import org.apache.lucene.queryParser.core.nodes.TokenizedPhraseQueryNode;
+import org.apache.lucene.queryParser.core.processors.QueryNodeProcessorImpl;
+import org.apache.lucene.queryParser.standard.config.StandardQueryConfigHandler.ConfigurationKeys;
+import org.apache.lucene.queryParser.standard.nodes.MultiPhraseQueryNode;
+
+/**
+ * This processor verifies if {@link ConfigurationKeys#PHRASE_SLOP}
+ * is defined in the {@link QueryConfigHandler}. If it is, it looks for every
+ * {@link TokenizedPhraseQueryNode} and {@link MultiPhraseQueryNode} that does
+ * not have any {@link SlopQueryNode} applied to it and creates an
+ * {@link SlopQueryNode} and apply to it. The new {@link SlopQueryNode} has the
+ * same slop value defined in the configuration. <br/>
+ * 
+ * @see SlopQueryNode
+ * @see ConfigurationKeys#PHRASE_SLOP
+ */
+public class DefaultPhraseSlopQueryNodeProcessor extends QueryNodeProcessorImpl {
+
+  private boolean processChildren = true;
+
+  private int defaultPhraseSlop;
+
+  public DefaultPhraseSlopQueryNodeProcessor() {
+    // empty constructor
+  }
+
+  @Override
+  public QueryNode process(QueryNode queryTree) throws QueryNodeException {
+    QueryConfigHandler queryConfig = getQueryConfigHandler();
+
+    if (queryConfig != null) {
+      Integer defaultPhraseSlop = queryConfig.get(ConfigurationKeys.PHRASE_SLOP); 
+      
+      if (defaultPhraseSlop != null) {
+        this.defaultPhraseSlop = defaultPhraseSlop;
+
+        return super.process(queryTree);
+
+      }
+
+    }
+
+    return queryTree;
+
+  }
+
+  @Override
+  protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {
+
+    if (node instanceof TokenizedPhraseQueryNode
+        || node instanceof MultiPhraseQueryNode) {
+
+      return new SlopQueryNode(node, this.defaultPhraseSlop);
+
+    }
+
+    return node;
+
+  }
+
+  @Override
+  protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException {
+
+    if (node instanceof SlopQueryNode) {
+      this.processChildren = false;
+
+    }
+
+    return node;
+
+  }
+
+  @Override
+  protected void processChildren(QueryNode queryTree) throws QueryNodeException {
+
+    if (this.processChildren) {
+      super.processChildren(queryTree);
+
+    } else {
+      this.processChildren = true;
+    }
+
+  }
+
+  @Override
+  protected List<QueryNode> setChildrenOrder(List<QueryNode> children)
+      throws QueryNodeException {
+
+    return children;
+
+  }
+
+}