org.apache.taglibs.standard.lang.jstl.OrOperator Maven / Gradle / Ivy
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/*
* Copyright (c) 1997-2018 Oracle and/or its affiliates. All rights reserved.
* Copyright 2004 The Apache Software Foundation
*
* Licensed 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.
*/
package org.apache.taglibs.standard.lang.jstl;
/**
*
* The implementation of the or operator
*
* @author Nathan Abramson - Art Technology Group
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $
**/
public class OrOperator
extends BinaryOperator
{
//-------------------------------------
// Singleton
//-------------------------------------
public static final OrOperator SINGLETON =
new OrOperator ();
//-------------------------------------
/**
*
* Constructor
**/
public OrOperator ()
{
}
//-------------------------------------
// Expression methods
//-------------------------------------
/**
*
* Returns the symbol representing the operator
**/
public String getOperatorSymbol ()
{
return "or";
}
//-------------------------------------
/**
*
* Applies the operator to the given value
**/
public Object apply (Object pLeft,
Object pRight,
Object pContext,
Logger pLogger)
throws ELException
{
// Coerce the values to booleans
boolean left =
Coercions.coerceToBoolean (pLeft, pLogger).booleanValue ();
boolean right =
Coercions.coerceToBoolean (pRight, pLogger).booleanValue ();
return PrimitiveObjects.getBoolean (left || right);
}
//-------------------------------------
/**
*
* Returns true if evaluation is necessary given the specified Left
* value. The And/OrOperators make use of this
**/
public boolean shouldEvaluate (Object pLeft)
{
return
(pLeft instanceof Boolean) &&
((Boolean) pLeft).booleanValue () == false;
}
//-------------------------------------
/**
*
* Returns true if the operator expects its arguments to be coerced
* to Booleans. The And/Or operators set this to true.
**/
public boolean shouldCoerceToBoolean ()
{
return true;
}
//-------------------------------------
}