org.databene.script.expression.ConditionalExpression Maven / Gradle / Ivy
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'DatabeneScript' is an open source software library for resolving Java-like script expressions, written by Volker Bergmann.
/*
* (c) Copyright 2009-2011 by Volker Bergmann. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, is permitted under the terms of the
* GNU General Public License.
*
* For redistributing this software or a derivative work under a license other
* than the GPL-compatible Free Software License as defined by the Free
* Software Foundation or approved by OSI, you must first obtain a commercial
* license to this software product from Volker Bergmann.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
* REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
* HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 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.
*/
package org.databene.script.expression;
import org.databene.commons.Context;
import org.databene.commons.converter.AnyConverter;
import org.databene.script.Expression;
/**
* {@link Expression} implementation that evaluates a boolean (condition) expression
* and, depending if the result was true or false, evaluates the first or second expression delegate.
* The semantic is like the Java expression (condition ? alt1 : alt2).
*
* Created at 06.10.2009 16:04:15
* @since 0.6.0
* @author Volker Bergmann
*/
public class ConditionalExpression extends DynamicExpression {
private Expression condition;
private Expression alt1;
private Expression alt2;
public ConditionalExpression(Expression condition,
Expression alt1, Expression alt2) {
this.condition = condition;
this.alt1 = alt1;
this.alt2 = alt2;
}
public E evaluate(Context context) {
boolean cond = AnyConverter.convert(condition.evaluate(context), Boolean.class);
return (cond ? alt1 : alt2).evaluate(context);
}
@Override
public String toString() {
return "(" + condition + " ? " + alt1 + " : " + alt2 + ")";
}
}