com.holonplatform.core.internal

Enum DefaultContext

java.lang.Object

java.lang.Enum<DefaultContext>

com.holonplatform.core.internal.DefaultContext

All Implemented Interfaces:

Context, Serializable, Comparable<DefaultContext>

public enum DefaultContext
extends Enum<DefaultContext>
implements Context

Default Context implementation, using ContextManager to access context scopes and resources.

Since:

5.0.0

Enum Constant Summary

Enum Constants

Enum Constant and Description
INSTANCE

Field Summary

Fields inherited from interface com.holonplatform.core.Context

CLASSLOADER_SCOPE_NAME, THREAD_SCOPE_NAME

Method Summary

Modifier and Type	Method and Description
<T> Optional<T>	resource(String resourceKey, Class<T> resourceType, ClassLoader classLoader) Lookup a context resource of resourceType class using given resourceKey.
Optional<ContextScope>	scope(String name, ClassLoader classLoader) Gets a registered ContextScope with the given name and bound to given classLoader.
static DefaultContext	valueOf(String name) Returns the enum constant of this type with the specified name.
static DefaultContext[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

compareTo, equals, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.holonplatform.core.Context

classLoaderScope, classLoaderScope, executeThreadBound, executeThreadBound, get, resource, resource, resource, scope, threadScope, threadScope

Enum Constant Detail

INSTANCE

public static final DefaultContext INSTANCE

Method Detail

values

public static DefaultContext[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (DefaultContext c : DefaultContext.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static DefaultContext valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

scope

public Optional<ContextScope> scope(String name,
                                    ClassLoader classLoader)

Description copied from interface: Context

Gets a registered ContextScope with the given name and bound to given classLoader.

Specified by:

scope in interface Context

Parameters:

name - Scope name (not null)

classLoader - ClassLoader, if null, the default ClassLoader is used

Returns:

The registered ContextScope with given name, or an empty Optional if a scope with such name is not registered in context

resource

public <T> Optional<T> resource(String resourceKey,
                                Class<T> resourceType,
                                ClassLoader classLoader)

Description copied from interface: Context

Lookup a context resource of resourceType class using given resourceKey.

All registered context scopes are invoked, in the order defined by ContextScope.getOrder() precedence value. The first not null resource instance obtained from a scope is the one returned to caller, if any.

Specified by:

resource in interface Context

Type Parameters:

T - Resource type

Parameters:

resourceKey - Resource key (not null)

resourceType - Required resource type (not null)

classLoader - ClassLoader to use. If null, the default ClassLoader is used.

Returns:

Optional resource instance, empty if not available from context