- /*
- * 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>Represents a conditional expression. I've decided not to produce an
- * abstract base "TernaryOperatorExpression" class since (a) future ternary
- * operators are unlikely and (b) it's not clear that there would be a
- * meaningful way to abstract them. (For instance, would they all be right-
- * associative? Would they all have two fixed operator symbols?)
- *
- * @author Shawn Bayern
- **/
-
- public class ConditionalExpression
- extends Expression
- {
- //-------------------------------------
- // Properties
- //-------------------------------------
- // property condition
-
- Expression mCondition;
- public Expression getCondition ()
- { return mCondition; }
- public void setCondition (Expression pCondition)
- { mCondition = pCondition; }
-
- //-------------------------------------
- // property trueBranch
-
- Expression mTrueBranch;
- public Expression getTrueBranch ()
- { return mTrueBranch; }
- public void setTrueBranch (Expression pTrueBranch)
- { mTrueBranch = pTrueBranch; }
-
- //-------------------------------------
- // property falseBranch
-
- Expression mFalseBranch;
- public Expression getFalseBranch ()
- { return mFalseBranch; }
- public void setFalseBranch (Expression pFalseBranch)
- { mFalseBranch = pFalseBranch; }
-
- //-------------------------------------
- /**
- *
- * Constructor
- **/
- public ConditionalExpression (Expression pCondition,
- Expression pTrueBranch,
- Expression pFalseBranch)
- {
- mCondition = pCondition;
- mTrueBranch = pTrueBranch;
- mFalseBranch = pFalseBranch;
- }
-
- //-------------------------------------
- // Expression methods
- //-------------------------------------
- /**
- *
- * Returns the expression in the expression language syntax
- **/
- public String getExpressionString ()
- {
- return
- "( " + mCondition.getExpressionString() + " ? " +
- mTrueBranch.getExpressionString() + " : " +
- mFalseBranch.getExpressionString() + " )";
- }
-
- //-------------------------------------
- /**
- *
- * Evaluates the conditional expression and returns the literal result
- **/
- public Object evaluate (VariableResolver vr,
- FunctionMapper f,
- Logger l)
- throws ELException
- {
- // first, evaluate the condition (and coerce the result to a boolean value)
- boolean condition =
- Coercions.coerceToBoolean(
- mCondition.evaluate(vr, f, l), l).booleanValue();
-
- // then, use this boolean to branch appropriately
- if (condition)
- return mTrueBranch.evaluate(vr, f, l);
- else
- return mFalseBranch.evaluate(vr, f, l);
- }
-
- //-------------------------------------
- }