org.eclipse.ocl.examples.pivot.delegate
Class OCLQueryDelegate

java.lang.Object
  org.eclipse.ocl.examples.pivot.delegate.OCLQueryDelegate

All Implemented Interfaces:

org.eclipse.emf.ecore.util.QueryDelegate

public class OCLQueryDelegate
extends java.lang.Object
implements org.eclipse.emf.ecore.util.QueryDelegate

An implementation of a query delegate for OCL expressions.

Since:

3.1

See Also:

OCLQueryDelegateFactory

Nested Class Summary

Nested classes/interfaces inherited from interface org.eclipse.emf.ecore.util.QueryDelegate

org.eclipse.emf.ecore.util.QueryDelegate.Factory

Field Summary

protected OCLDelegateDomain	delegateDomain
protected ExpressionInOcl	specification

Constructor Summary

OCLQueryDelegate(OCLDelegateDomain delegateDomain, ExpressionInOcl specification)
Initializes me with my domain, context, variables, and expression.

Method Summary

java.lang.Object	execute(java.lang.Object target, java.util.Map<java.lang.String,?> arguments) Executes the query for the specified target object.
void	prepare() Prepares the query wrapping any exceptions as InvocationTargetException.
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

delegateDomain

protected final OCLDelegateDomain delegateDomain

specification

protected final ExpressionInOcl specification

Constructor Detail

OCLQueryDelegate

public OCLQueryDelegate(OCLDelegateDomain delegateDomain,
                        ExpressionInOcl specification)

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

Parameters:

delegateDomain - my domain

context - my context

variables - name and types of variables used in my expression

expression - the expression that I handle

Throws:

ParserException - if the expression is invalid

Method Detail

prepare

public void prepare()
             throws java.lang.reflect.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.

Specified by:

prepare in interface org.eclipse.emf.ecore.util.QueryDelegate

Throws:

java.lang.reflect.InvocationTargetException - wrapping any parser, io exceptions

execute

public java.lang.Object execute(java.lang.Object target,
                                java.util.Map<java.lang.String,?> arguments)
                         throws java.lang.reflect.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.

Specified by:

execute in interface org.eclipse.emf.ecore.util.QueryDelegate

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:

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

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object