org.apache.el.parser.AstEmpty Maven / Gradle / Ivy
/* Generated By:JJTree: Do not edit this line. AstEmpty.java */
package org.apache.el.parser;
import java.util.Collection;
import java.util.Map;
import javax.el.ELException;
import org.apache.el.lang.EvaluationContext;
/**
* @author Jacob Hookom [[email protected]]
* @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: dpatil $
*/
public final class AstEmpty extends SimpleNode {
public AstEmpty(int id) {
super(id);
}
public Class getType(EvaluationContext ctx)
throws ELException {
return Boolean.class;
}
public Object getValue(EvaluationContext ctx)
throws ELException {
Object obj = this.children[0].getValue(ctx);
if (obj == null) {
return Boolean.TRUE;
} else if (obj instanceof String) {
return Boolean.valueOf(((String) obj).length() == 0);
} else if (obj instanceof Object[]) {
return Boolean.valueOf(((Object[]) obj).length == 0);
} else if (obj instanceof Collection) {
return Boolean.valueOf(((Collection) obj).isEmpty());
} else if (obj instanceof Map) {
return Boolean.valueOf(((Map) obj).isEmpty());
}
return Boolean.FALSE;
}
}