private final MethodExpression getMethodExpression(EvaluationContext ctx) throws ELException {
Object obj = null;
// case A: ValueExpression exists, getValue which must
// be a MethodExpression
VariableMapper varMapper = ctx.getVariableMapper();
ValueExpression ve = null;
if (varMapper != null) {
ve = varMapper.resolveVariable(this.image);
if (ve != null) {
obj = ve.getValue(ctx);
}
}
// case B: evaluate the identity against the ELResolver, again, must be
// a MethodExpression to be able to invoke
if (ve == null) {
ctx.setPropertyResolved(false);
obj = ctx.getELResolver().getValue(ctx, null, this.image);
}
// finally provide helpful hints
if (obj instanceof MethodExpression) {
return (MethodExpression) obj;
} else if (obj == null) {
throw new MethodNotFoundException(
"Identity '" + this.image + "' was null and was unable to invoke");
} else {
throw new ELException(
"Identity '"
+ this.image
+ "' does not reference a MethodExpression instance, returned type: "
+ obj.getClass().getName());
}
}
@Override
public void setValue(EvaluationContext ctx, Object value) throws ELException {
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
expr.setValue(ctx.getELContext(), value);
return;
}
}
ctx.setPropertyResolved(false);
ctx.getELResolver().setValue(ctx, null, this.image, value);
if (!ctx.isPropertyResolved()) {
throw new PropertyNotFoundException(
MessageFactory.get("error.resolver.unhandled.null", this.image));
}
}
@Override
public boolean isReadOnly(EvaluationContext ctx) throws ELException {
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper != null) {
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr != null) {
return expr.isReadOnly(ctx.getELContext());
}
}
ctx.setPropertyResolved(false);
boolean result = ctx.getELResolver().isReadOnly(ctx, null, this.image);
if (!ctx.isPropertyResolved()) {
throw new PropertyNotFoundException(
MessageFactory.get("error.resolver.unhandled.null", this.image));
}
return result;
}
@Override
public ValueReference getValueReference(EvaluationContext ctx) {
VariableMapper varMapper = ctx.getVariableMapper();
if (varMapper == null) {
return null;
}
ValueExpression expr = varMapper.resolveVariable(this.image);
if (expr == null) {
return null;
}
return expr.getValueReference(ctx);
}
@Override
public MethodInfo getMethodInfo(EvaluationContext ctx, Class<?>[] paramTypes) throws ELException {
return this.getMethodExpression(ctx).getMethodInfo(ctx.getELContext());
}
@Override
public Object invoke(EvaluationContext ctx, Class<?>[] paramTypes, Object[] paramValues)
throws ELException {
return this.getMethodExpression(ctx).invoke(ctx.getELContext(), paramValues);
}
