- /*
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 1999 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution, if
- * any, must include the following acknowlegement:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowlegement may appear in the software itself,
- * if and wherever such third-party acknowlegements normally appear.
- *
- * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
- * Foundation" must not be used to endorse or promote products derived
- * from this software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache"
- * nor may "Apache" appear in their names without prior written
- * permission of the Apache Group.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- *
- */
-
- package org.apache.commons.el;
-
- import java.util.List;
- import java.util.Map;
- import javax.servlet.jsp.el.ELException;
- import javax.servlet.jsp.el.VariableResolver;
- import javax.servlet.jsp.el.FunctionMapper;
-
- /**
- *
- * <p>An expression representing a binary operator on a value
- *
- * @author Nathan Abramson - Art Technology Group
- * @author Shawn Bayern
- * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
- **/
-
- public class BinaryOperatorExpression
- extends Expression
- {
- //-------------------------------------
- // Properties
- //-------------------------------------
- // property expression
-
- Expression mExpression;
- public Expression getExpression ()
- { return mExpression; }
- public void setExpression (Expression pExpression)
- { mExpression = pExpression; }
-
- //-------------------------------------
- // property operators
-
- List mOperators;
- public List getOperators ()
- { return mOperators; }
- public void setOperators (List pOperators)
- { mOperators = pOperators; }
-
- //-------------------------------------
- // property expressions
-
- List mExpressions;
- public List getExpressions ()
- { return mExpressions; }
- public void setExpressions (List pExpressions)
- { mExpressions = pExpressions; }
-
- //-------------------------------------
- /**
- *
- * Constructor
- **/
- public BinaryOperatorExpression (Expression pExpression,
- List pOperators,
- List pExpressions)
- {
- mExpression = pExpression;
- mOperators = pOperators;
- mExpressions = pExpressions;
- }
-
- //-------------------------------------
- // Expression methods
- //-------------------------------------
- /**
- *
- * Returns the expression in the expression language syntax
- **/
- public String getExpressionString ()
- {
- StringBuffer buf = new StringBuffer ();
- buf.append ("(");
- buf.append (mExpression.getExpressionString ());
- for (int i = 0; i < mOperators.size (); i++) {
- BinaryOperator operator = (BinaryOperator) mOperators.get (i);
- Expression expression = (Expression) mExpressions.get (i);
- buf.append (" ");
- buf.append (operator.getOperatorSymbol ());
- buf.append (" ");
- buf.append (expression.getExpressionString ());
- }
- buf.append (")");
-
- return buf.toString ();
- }
-
- //-------------------------------------
- /**
- *
- * Evaluates to the literal value
- **/
- public Object evaluate (VariableResolver pResolver,
- FunctionMapper functions,
- Logger pLogger)
- throws ELException
- {
- Object value = mExpression.evaluate (pResolver, functions, pLogger);
- for (int i = 0; i < mOperators.size (); i++) {
- BinaryOperator operator = (BinaryOperator) mOperators.get (i);
-
- // For the And/Or operators, we need to coerce to a boolean
- // before testing if we shouldEvaluate
- if (operator.shouldCoerceToBoolean ()) {
- value = Coercions.coerceToBoolean (value, pLogger);
- }
-
- if (operator.shouldEvaluate (value)) {
- Expression expression = (Expression) mExpressions.get (i);
- Object nextValue = expression.evaluate (pResolver,
- functions,
- pLogger);
-
- value = operator.apply (value, nextValue, pLogger);
- }
- }
- return value;
- }
-
- //-------------------------------------
- }