org.eclipse.emf.ecore.util
Interface QueryDelegate

public interface QueryDelegate

An interface for delegating query execution.

Since:

2.7

Nested Class Summary

static interface

QueryDelegate.Factory A factory for creating query delegates.

Method Summary

java.lang.Object	execute(java.lang.Object target, java.util.Map<java.lang.String,?> arguments) Executes the query against the specified target object.
void	prepare() Prepares (e.g., parses) the query for execution.

Method Detail

prepare

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

Prepares (e.g., parses) the query for execution.

Throws:

java.lang.reflect.InvocationTargetException - in case of failure to prepare (e.g., parse) the query, usually because of an exception

execute

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

Executes the query against the specified target object.

Parameters:

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

arguments - a map of parameter names to values; must correspond to the parameters with which the delegate was created

Returns:

the query's result

Throws:

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