com.disney.groovity.tags.Unless Maven / Gradle / Ivy
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*
* Licensed under the Apache License, Version 2.0 (the "Apache License")
* with the following modification; you may not use this file except in
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*
* 6. Trademarks. This License does not grant permission to use the trade
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* the License and to reproduce the content of the NOTICE file.
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*
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package com.disney.groovity.tags;
import groovy.lang.Closure;
import java.util.Map;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
import com.disney.groovity.Taggable;
import com.disney.groovity.doc.Attr;
import com.disney.groovity.doc.Tag;
/**
* The tag renders its body unless test condition is true. Does the opposite of what the if tag does.
*
* unless(
* - test:
* an expression that evaluates to true or false,
*
{
* // The body to execute when the test expression evaluates to false
* });
*
* Sample
*
* <~ <g:unless test="${num % 2 == 0}">
* ${num},
* </g:unless> ~>
*
*
* @author Alex Vigdor
*/
@Tag(
info = "The tag renders its body unless test condition is true. Does the opposite of what the if tag does.",
body = "The body to execute when the test expression evaluates to false",
sample="<~ \n" +
"\t${num},\n" +
" ~>",
attrs = {
@Attr(
name = "test",
info="an expression that evaluates to true or false",
required = true
)
}
)
public class Unless implements Taggable {
@SuppressWarnings("rawtypes")
public Object tag(Map attributes, Closure body) {
Object test = resolve(attributes,"test");
if(!(test instanceof Boolean)){
test = DefaultTypeTransformation.castToBoolean(test);
}
if(!((Boolean)test).booleanValue()){
return body.call();
}
return null;
}
}