package com.cloudbees.groovy.cps;
import com.cloudbees.groovy.cps.impl.ConstantBlock;
import com.cloudbees.groovy.cps.impl.ThrowBlock;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
/**
* Result of an evaluation.
*
* Either represents a value in case of a normal return, or a throwable object in case of abnormal return.
* Note that both fields can be null, in which case it means a normal return of the value 'null'.
*
* @author Kohsuke Kawaguchi
*/
public final class Outcome implements Serializable {
private final Object normal;
private final Throwable abnormal;
public Outcome(Object normal, Throwable abnormal) {
assert normal==null || abnormal==null;
this.normal = normal;
this.abnormal = abnormal;
}
/**
* Like {@link #replay()} but wraps the throwable into {@link InvocationTargetException}.
*/
public Object wrapReplay() throws InvocationTargetException {
if (abnormal!=null)
throw new InvocationTargetException(abnormal);
else
return normal;
}
public Object replay() throws Throwable {
if (abnormal!=null)
throw abnormal;
else
return normal;
}
public Object getNormal() {
return normal;
}
public Throwable getAbnormal() {
return abnormal;
}
public boolean isSuccess() {
return abnormal==null;
}
public boolean isFailure() {
return abnormal!=null;
}
public Next resumeFrom(Env e, Continuation k) {
if (abnormal!=null) {
// resume program by throwing this exception
return new Next(new ThrowBlock(new ConstantBlock(abnormal)),e,null/*unused*/);
} else {
// resume program by passing the value
return k.receive(normal);
}
}
// public Block asBlock() {
// if (abnormal!=null) {
// // resume program by throwing this exception
// return new ThrowBlock(new ConstantBlock(abnormal));
// } else {
// // resume program by passing the value
// return new ConstantBlock(normal);
// }
// }
@Override
public String toString() {
if (abnormal!=null) return "abnormal["+abnormal+']';
else return "normal["+normal+']';
}
private static final long serialVersionUID = 1L;
}