com.hammurapi.common

Class DefaultContext

java.lang.Object

com.hammurapi.common.DefaultContext

All Implemented Interfaces:

Context

public class DefaultContext
extends Object
implements Context

Default context uses ServiceLoader to find services in a given classloader and map of bindings.

Field Summary

Fields inherited from interface com.hammurapi.common.Context

INSTANCE

Constructor Summary

Constructors

Constructor and Description
DefaultContext(ClassLoader classLoader, Map<String,Object> bindings)

Method Summary

Methods

Modifier and Type	Method and Description
<T> T	lookup(Class<T> serviceClass, Predicate<T,Context>... selectors) Looks up single object (service) by type.
Object	lookup(String name) Looks up object by name.
<T> Iterator<T>	lookupAll(Class<T> serviceClass, Predicate<T,Context>... selectors) Looks up all services of given type.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultContext

public DefaultContext(ClassLoader classLoader,
              Map<String,Object> bindings)

Parameters:

classLoader - ClassLoader for services. Can be null.

bindings - Name bindings. Can be null.

Method Detail

lookup

public Object lookup(String name)

Description copied from interface: Context

Looks up object by name.

Specified by:

lookup in interface Context

Parameters:

name - Object name.

Returns:

named object or null.

lookup

public <T> T lookup(Class<T> serviceClass,
           Predicate<T,Context>... selectors)

Description copied from interface: Context

Looks up single object (service) by type.

Specified by:

lookup in interface Context

Type Parameters:

T - Service type.

Parameters:

serviceClass - Requested service type.

selectors - Optional service selectors. If more than one, selectors are combined with AND.

Returns:

Service instance or null.

lookupAll

public <T> Iterator<T> lookupAll(Class<T> serviceClass,
                        Predicate<T,Context>... selectors)

Description copied from interface: Context

Looks up all services of given type.

Specified by:

lookupAll in interface Context

Type Parameters:

T - Service type.

Parameters:

serviceClass - Requested service type.

selectors - Optional service selectors. If more than one, selectors are combined with AND.

Returns:

Iterator over services of requested type.