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Diffstat (limited to 'velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/ASTAndNode.java')
-rw-r--r-- | velocity-engine-core/src/main/java/org/apache/velocity/runtime/parser/node/ASTAndNode.java | 123 |
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 && right = false + * left && null = false + * null && 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; + } +} |