pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / queryparser / src / java / org / apache / lucene / queryParser / core / nodes / GroupQueryNode.java

diff --git a/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/core/nodes/GroupQueryNode.java b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/core/nodes/GroupQueryNode.java
new file mode 100644 (file)
index 0000000..60e1f14
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+++ b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/core/nodes/GroupQueryNode.java
@@ -0,0 +1,85 @@
+package org.apache.lucene.queryParser.core.nodes;
+
+/**
+ * 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.ArrayList;
+import java.util.List;
+
+import org.apache.lucene.messages.MessageImpl;
+import org.apache.lucene.queryParser.core.QueryNodeError;
+import org.apache.lucene.queryParser.core.messages.QueryParserMessages;
+import org.apache.lucene.queryParser.core.parser.EscapeQuerySyntax;
+
+/**
+ * A {@link GroupQueryNode} represents a location where the original user typed
+ * real parenthesis on the query string. This class is useful for queries like:
+ * a) a AND b OR c b) ( a AND b) OR c
+ * 
+ * Parenthesis might be used to define the boolean operation precedence.
+ */
+public class GroupQueryNode extends QueryNodeImpl {
+
+  private static final long serialVersionUID = -9204673493869114999L;
+
+  /**
+   * This QueryNode is used to identify parenthesis on the original query string
+   */
+  public GroupQueryNode(QueryNode query) {
+    if (query == null) {
+      throw new QueryNodeError(new MessageImpl(
+          QueryParserMessages.PARAMETER_VALUE_NOT_SUPPORTED, "query", "null"));
+    }
+
+    allocate();
+    setLeaf(false);
+    add(query);
+  }
+
+  public QueryNode getChild() {
+    return getChildren().get(0);
+  }
+
+  @Override
+  public String toString() {
+    return "<group>" + "\n" + getChild().toString() + "\n</group>";
+  }
+
+  public CharSequence toQueryString(EscapeQuerySyntax escapeSyntaxParser) {
+    if (getChild() == null)
+      return "";
+
+    return "( " + getChild().toQueryString(escapeSyntaxParser) + " )";
+  }
+
+  @Override
+  public QueryNode cloneTree() throws CloneNotSupportedException {
+    GroupQueryNode clone = (GroupQueryNode) super.cloneTree();
+
+    return clone;
+  }
+
+  /**
+   * @param child
+   */
+  public void setChild(QueryNode child) {
+    List<QueryNode> list = new ArrayList<QueryNode>();
+    list.add(child);
+    this.set(list);
+  }
+
+}