org.hisp.dhis.rules.functions.RuleFunctionOizp Maven / Gradle / Ivy
package org.hisp.dhis.rules.functions;
/*
* Copyright (c) 2004-2018, University of Oslo
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 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.
* Neither the name of the HISP project nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS 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 COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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import org.hisp.dhis.parser.expression.antlr.ExpressionParser.ExprContext;
import org.hisp.dhis.rules.parser.expression.CommonExpressionVisitor;
import org.hisp.dhis.rules.parser.expression.function.ScalarFunctionToEvaluate;
/**
* @author Zubair Asghar.
*
* Evaluates the argument of type number to one if the value is zero or positive, otherwise to zero.
*/
public class RuleFunctionOizp
extends ScalarFunctionToEvaluate
{
@Override
public Object evaluate( ExprContext ctx, CommonExpressionVisitor visitor )
{
Double value = Double.parseDouble( visitor.castStringVisit( ctx.expr( 0 ) ) );
return value >= 0 ? String.valueOf( 1 ) : String.valueOf( 0 );
}
@Override
public Object getDescription( ExprContext ctx, CommonExpressionVisitor visitor )
{
visitor.castDoubleVisit( ctx.expr( 0 ) );
return CommonExpressionVisitor.DEFAULT_DOUBLE_VALUE;
}
}