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package org.apache.taglibs.standard.extra.spath;
/**
* <p>Represents a predicate expression concerning a single attribute.</p>
*
* @author Shawn Bayern
*/
public class AttributePredicate extends Predicate {
private String attribute, target;
/**
* Constructs a new AttributePredicate, given an attribute name
* and a target literal (with which to test equality).
*/
public AttributePredicate(String attribute, String target) {
if (attribute == null)
throw new IllegalArgumentException("non-null attribute needed");
if (attribute.indexOf(":") != -1)
throw new IllegalArgumentException(
"namespace-qualified attribute names are not currently " +
"supported");
this.attribute = attribute;
if (target == null)
throw new IllegalArgumentException("non-null target needed");
// strip quotation marks from target
this.target = target.substring(1, target.length() - 1);
}
/**
* Returns true if the given SAX AttributeList is suitable, given our
* attribute name and target; returns false otherwise.
*/
public boolean isMatchingAttribute(org.xml.sax.Attributes a) {
String attValue = a.getValue("", attribute);
return (attValue != null && attValue.equals(target));
}
}
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