Update of /cvsroot/xdoclet/xdoclet2/src/java/xdoclet/util/predicates
In directory sc8-pr-cvs1:/tmp/cvs-serv10623/src/java/xdoclet/util/predicates
Added Files:
ReflectionPredicate.java
Log Message:
New
--- NEW FILE: ReflectionPredicate.java ---
package xdoclet.util.predicates;
import xjavadoc.predicates.ProgramElementPredicate;
import xjavadoc.XProgramElement;
import java.lang.reflect.Method;
/**
* Predicate that uses reflection to call a no-argument method that returns a boolean.
* This is so we don't have to write one Predicate for all the different
* isXxx() methods in the XJavadoc API.
*
* @author <a href="mailto:aslak.hellesoy at bekk.no">Aslak Hellesøy</a>
* @version $Revision: 1.1 $
*/
public class ReflectionPredicate extends ProgramElementPredicate {
private String _methodName;
private boolean _negation;
protected boolean evaluate(XProgramElement programElement) {
// Find the method. We only support methods with no arguments that return a
boolean.
Method method = null;
try {
method = programElement.getClass().getMethod( _methodName, null );
} catch (Exception e) {
throw new IllegalStateException(_methodName + " should be a no-arg
method");
}
Class returnType = method.getReturnType();
if( returnType != Boolean.TYPE ) {
throw new IllegalStateException(_methodName + " should return boolean.");
}
Boolean bool = null;
try {
bool = (Boolean) method.invoke(programElement, null);
} catch (Exception e) {
e.printStackTrace();
throw new IllegalStateException("Failed to invoke " + _methodName);
}
boolean result = bool.booleanValue();
result = _negation ? !result : result;
return result;
}
public ReflectionPredicate() {
}
public ReflectionPredicate(String method) {
setMethod(method);
}
public void setMethod(String method) {
if( method.charAt(0) == '!' ) {
_negation = true;
_methodName = method.substring(1);
} else {
_negation = false;
_methodName = method;
}
}
}
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