pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/core/nodes/BooleanQueryNode.java b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/core/nodes/BooleanQueryNode.java
new file mode 100644 (file)
index 0000000..8a18325
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+++ b/lucene-java-3.5.0/lucene/contrib/queryparser/src/java/org/apache/lucene/queryParser/core/nodes/BooleanQueryNode.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.List;
+
+import org.apache.lucene.queryParser.core.parser.EscapeQuerySyntax;
+
+/**
+ * A {@link BooleanQueryNode} represents a list of elements which do not have an
+ * explicit boolean operator defined between them. It can be used to express a
+ * boolean query that intends to use the default boolean operator.
+ */
+public class BooleanQueryNode extends QueryNodeImpl {
+
+  private static final long serialVersionUID = -2206623652088638072L;
+
+  /**
+   * @param clauses
+   *          - the query nodes to be and'ed
+   */
+  public BooleanQueryNode(List<QueryNode> clauses) {
+    setLeaf(false);
+    allocate();
+    set(clauses);
+  }
+
+  @Override
+  public String toString() {
+    if (getChildren() == null || getChildren().size() == 0)
+      return "<boolean operation='default'/>";
+    StringBuilder sb = new StringBuilder();
+    sb.append("<boolean operation='default'>");
+    for (QueryNode child : getChildren()) {
+      sb.append("\n");
+      sb.append(child.toString());
+    }
+    sb.append("\n</boolean>");
+    return sb.toString();
+  }
+
+  public CharSequence toQueryString(EscapeQuerySyntax escapeSyntaxParser) {
+    if (getChildren() == null || getChildren().size() == 0)
+      return "";
+
+    StringBuilder sb = new StringBuilder();
+    String filler = "";
+    for (QueryNode child : getChildren()) {
+      sb.append(filler).append(child.toQueryString(escapeSyntaxParser));
+      filler = " ";
+    }
+
+    // in case is root or the parent is a group node avoid parenthesis
+    if ((getParent() != null && getParent() instanceof GroupQueryNode)
+        || isRoot())
+      return sb.toString();
+    else
+      return "( " + sb.toString() + " )";
+  }
+
+  @Override
+  public QueryNode cloneTree() throws CloneNotSupportedException {
+    BooleanQueryNode clone = (BooleanQueryNode) super.cloneTree();
+
+    // nothing to do here
+
+    return clone;
+  }
+
+}