org.eclipse.ocl.pivot.internal.delegate

Class OCLQueryDelegate

java.lang.Object

org.eclipse.ocl.pivot.internal.delegate.OCLQueryDelegate

Direct Known Subclasses:

OCLDebugQueryDelegate

public class OCLQueryDelegate
extends Object

An implementation of a query delegate for OCL expressions.

See Also:

OCLQueryDelegateFactory

Constructor Summary

Constructors

Constructor and Description
OCLQueryDelegate(OCLDelegateDomain delegateDomain, EClassifier context, Map<String,EClassifier> parameters, String expression) Initializes me with my domain, context, variables, and expression.

Method Summary

Modifier and Type	Method and Description
Object	execute(Object target, Map<String,?> arguments) Executes the query for the specified target object.
void	prepare() Prepares the query wrapping any exceptions as InvocationTargetException.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

OCLQueryDelegate

public OCLQueryDelegate(OCLDelegateDomain delegateDomain,
                        EClassifier context,
                        Map<String,EClassifier> parameters,
                        String expression)

Initializes me with my domain, context, variables, and expression.

Parameters:

delegateDomain - my domain

context - my context

parameters - name and types of variables used in my expression

expression - the expression that I handle

Throws:

ParserException - if the expression is invalid

Method Detail

execute

public Object execute(Object target,
                      Map<String,?> arguments)
               throws InvocationTargetException

Executes the query for the specified target object. The result is the OCL evaluation result which may be a Number, String, Collection or other object for normal returns or a NullLiteralExp for null, or an InvalidLiteralExp for invalid.

Parameters:

target - the object on which to execute the query; this must be an instance of the context with which the delegate was created

arguments - a map of variable names to values; these must correspond to the variables with which the delegate was created

Returns:

the query's result

Throws:

InvocationTargetException - in case of failure to prepare or execute the query, usually because of an exception

prepare

public void prepare()
             throws InvocationTargetException

Prepares the query wrapping any exceptions as InvocationTargetException. This method is lazily invoked from execute, but may be invoked eagerly to detect compilation errors earlier or incur compilation costs at a more convenient time.

Throws:

InvocationTargetException - wrapping any parser, io exceptions

toString

public String toString()

Overrides:

toString in class Object