1 files changed, 123 insertions, 0 deletions
diff --git a/velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/ASTAndNode.java b/velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/ASTAndNode.java
new file mode 100644
index 00000000..2338d40f
--- /dev/null
+++ b/velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/ASTAndNode.java
@@ -0,0 +1,123 @@
+package org.apache.velocity.runtime.parser.node;
+
+/*
+ * 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.velocity.context.InternalContextAdapter;
+import org.apache.velocity.exception.MethodInvocationException;
+import org.apache.velocity.runtime.parser.Parser;
+
+/**
+ * Please look at the Parser.jjt file which is
+ * what controls the generation of this class.
+ *
+ * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
+ * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
+ * @version $Id$
+ */
+public class ASTAndNode extends ASTLogicalOperator
+{
+    /**
+     * @param id
+     */
+    public ASTAndNode(int id)
+    {
+        super(id);
+    }
+
+    /**
+     * @param p
+     * @param id
+     */
+    public ASTAndNode(Parser p, int id)
+    {
+        super(p, id);
+    }
+
+    @Override
+    public String getLiteralOperator()
+    {
+        return "&&";
+    }
+
+    /**
+     * @see org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(org.apache.velocity.runtime.parser.node.ParserVisitor, java.lang.Object)
+     */
+    @Override
+    public Object jjtAccept(ParserVisitor visitor, Object data)
+    {
+        return visitor.visit(this, data);
+    }
+
+    /**
+     *  Returns the value of the expression.
+     *  Since the value of the expression is simply the boolean
+     *  result of evaluate(), lets return that.
+     * @param context
+     * @return The value of the expression.
+     * @throws MethodInvocationException
+     */
+    @Override
+    public Object value(InternalContextAdapter context)
+        throws MethodInvocationException
+    {
+        return evaluate(context) ? Boolean.TRUE : Boolean.FALSE;
+    }
+
+    /**
+     * logical and :
+     * <pre>
+     *   null &amp;&amp; right = false
+     *   left &amp;&amp; null = false
+     *   null &amp;&amp; null = false
+     * </pre>
+     * @param context
+     * @return True if both sides are true.
+     * @throws MethodInvocationException
+     */
+    @Override
+    public boolean evaluate(InternalContextAdapter context)
+        throws MethodInvocationException
+    {
+        Node left = jjtGetChild(0);
+        Node right = jjtGetChild(1);
+
+        /*
+         * null == false
+         */
+        if (left == null || right == null)
+        {
+            return false;
+        }
+
+        /*
+         *  short circuit the test.  Don't eval the RHS if the LHS is false
+         */
+
+        if( left.evaluate( context ) )
+        {
+            if ( right.evaluate( context ) )
+            {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}