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Public API for the Apache MyFaces Trinidad project
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.myfaces.trinidad.skin;
import java.util.Iterator;
import java.util.Map;
import java.util.WeakHashMap;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import org.apache.myfaces.trinidad.logging.TrinidadLogger;
/**
* All methods in this class dealing with skin management activities such as loading, creating,
* managing and disposing skins are deprecated. It is recommended to use SkinProvider instead of
* SkinFactory for the deprecated APIs. SkinProvider introduces lazy / on-demand loading of skins as
* opposed to eager loading done by SkinFactory. SkinProvider also introduces the flexibility to
* create and manage external skin repositories. Thus we have better manageability of Skins and
* clear separation of external skins and trinidad provided / supported skins.
*
* SkinFactory exists today to provide SkinProvider implementers an easy way to create a Skin object
* without having to implement Skin interface.This is done using SkinFactory#createSkin API. Skin
* object created using this API can be used by the SkinProvider implementation's
* SkinProvider#getSkin methods. SkinProvider implementation should take care of managing the skin
* and destroy it when required.
*
* Creating a Skin using this SkinFactory#createSkin API is different from adding a Skin into
* SkinFactory using SkinFactory#addSkin. With SkinFactory#createSkin the responsibility of managing
* the Skin and returning is in response to SkinProvider#getSkin calls is with the SkinProvider and
* with SkinFactory#addSkin, this responsibility is with the SkinFactory.
*
* @see SkinProvider
* @see Skin
* @see SkinMetadata
*/
abstract public class SkinFactory
{
/**
* Retrieve the current SkinFactory.
*/
static public SkinFactory getFactory()
{
synchronized (_FACTORIES)
{
return _FACTORIES.get(_getClassLoader());
}
}
/**
* Store the current SkinFactory.
*/
static public void setFactory(SkinFactory factory)
{
synchronized (_FACTORIES)
{
ClassLoader cl = _getClassLoader();
if (_FACTORIES.get(cl) != null)
{
throw new IllegalStateException(_LOG.getMessage(
"FACTORY_ALREADY_AVAILABlE_FOR_THIS_CLASS_LOADER"));
}
_FACTORIES.put(cl, factory);
}
}
/**
* Creates a Skin based on the supplied base skin information and skinMetadata information. This
* API can be used by SkinProvider implementers to create Skin objects which their SkinProvider
* implementation supports. As a minimum, the user of this API should pass information to obtain
* the base skin through 'baseSkinMetadata' and provide information such as id, family, renderkit
* etc for the new skin through 'skinMetadata'.
*
* @param externalContext valid ExternalContext
* @param baseSkinMetadata {@link SkinMetadata} metadata to find the base skin for the new skin to
* be created. The user should pass enough information to pick the base
* skin with id / family / version / renderkit. Base skin is obtained
* using SkinProvider#getSkin API.
* @param skinMetadata {@link SkinMetadata} metadata to create new Skin. The user should pass
* all information such as id, family, version, renderkit, styleSheetName,
* features, metadata etc. for the new skin.
* @return a new skin {@link Skin} object created using the skinMetadata {@link SkinMetadata}
* supplied
* @throws IllegalArgumentException if the baseSkinId contained in the supplied skinMetadata did
* not match the id of the baseSkin obtained using
* baseSkinMetadata
* @throws ClassCastException if SkinProvider does not provide as matching base skin as per
* metadata passed in baseSkinMetadata
*/
public Skin createSkin(
ExternalContext externalContext,
SkinMetadata baseSkinMetadata,
SkinMetadata skinMetadata)
{
throw new UnsupportedOperationException(_LOG.getMessage("SKIN_FACTORY_NO_CREATE_SKIN_SUPPORT",
this));
}
/**
* Creates a Skin based on the supplied base skin information and skinMetadata information. This
* API can be used by SkinProvider implementers to create Skin objects which their SkinProvider
* implementation supports. As a minimum, the user of this API should pass information such as
* baseSkinId, id, family, renderkit etc for the new skin through 'skinMetadata'.
*
* @param externalContext valid ExternalContext
* @param skinMetadata {@link SkinMetadata} metadata to create new Skin. The user should
* pass all information such as baseSkinId, id, family, version, renderkit,
* styleSheetName, features, metadata etc. for the new skin. baseSkinId is
* mandatory, since it is used to query the base skin for the new skin
* using SkinProvider#getSkin API.
* @return a new skin {@link Skin} object created using the skinMetadata {@link SkinMetadata}
* supplied
* @throws IllegalArgumentException if the baseSkinId contained in the supplied skinMetadata did
* not match the id of the baseSkin obtained from
* SkinProvider#getSkin
*/
public Skin createSkin(ExternalContext externalContext, SkinMetadata skinMetadata)
{
throw new UnsupportedOperationException(_LOG.getMessage("SKIN_FACTORY_NO_CREATE_SKIN_SUPPORT",
this));
}
/**
* Reloads the skins that was registered with this factory. Subclassers can choose to provide the
* implementation.
*
* @deprecated use SkinProvider SPI to deal with externals skins this functionality will now be
* replaced by having the SkinProvider implementations reloading skins themselves as and when
* required.
*/
@Deprecated
public void reload()
{
_LOG.warning("SKIN_FACTORY_NO_RELOAD_SUPPORT", this);
}
/**
* Register the specified {@link Skin} instance, associated with the specified
* skinId, to be supported by this {@link SkinFactory}, replacing any previously
* registered {@link Skin} for this identifier.
*
* @param skinId Identifier of the {@link Skin} to register
* @param skin {@link Skin} instance that we are registering
* @deprecated use SkinProvider SPI to deal with externals skins Implementing SkinProvider and
* exposing skins using SkinProvider#getSkin() method is recommended than using this API to make
* skins available at runtime.
*/
@Deprecated
public abstract void addSkin(String skinId, Skin skin);
/**
* Return a {@link Skin} instance for the specified skinId. If there is no registered {@link
* Skin} for the specified identifier, return null. The set of available skin
* identifiers is available via the getSkinIds() method.
*
* @param context FacesContext for the request currently being processed, or null if
* none is available.
* @param skinId Skin identifier of the requested {@link Skin} instance
* @deprecated use SkinProvider#getSkin method to query skins
*/
@Deprecated
public abstract Skin getSkin(FacesContext context, String skinId);
/**
* Return a {@link Skin} instance for the specified skinFamily and renderKitId. If there is no
* registered {@link Skin} for the specified identifier, return null. The set of
* available skin identifiers is available via the getSkinIds() method.
*
* @param context FacesContext for the request currently being processed, or null
* if none is available.
* @param family family of the requested {@link Skin} instance
* @param renderKitId RenderKit identifier of the requested {@link Skin} instance
* @deprecated use SkinProvider#getSkin method to query skins
*/
@Deprecated
public abstract Skin getSkin(
FacesContext context,
String family,
String renderKitId);
/**
* Return a {@link Skin} instance for the specified skinFamily and renderKitId, and skin
* version. The best matched skin is returned. If there is no registered {@link Skin} for the
* specified identifier, return null. The set of available skin identifiers is
* available via the getSkinIds() method.
*
* @param context FacesContext for the request currently being processed, or null
* if none is available.
* @param family family of the requested {@link Skin} instance
* @param renderKitId RenderKit identifier of the requested {@link Skin} instance
* @param version A string that denotes the skin version name. It can be "default" or the name
* of the version (see the Skin's SkinVersion#getName) or null which returns
* the skin with no version set.
* @deprecated use SkinProvider#getSkin method to query skins
*/
@Deprecated
public abstract Skin getSkin(
FacesContext context,
String family,
String renderKitId,
String version);
/**
* Return an Iterator over the set of skin identifiers registered with this
* factory.
*
* @deprecated use SkinProvider#getSkinMetadata to get the list of skins supported
*/
@Deprecated
public abstract Iterator getSkinIds();
static private ClassLoader _getClassLoader()
{
return Thread.currentThread().getContextClassLoader();
}
private static final Map _FACTORIES =
new WeakHashMap();
private static final TrinidadLogger _LOG =
TrinidadLogger.createTrinidadLogger(SkinFactory.class);
}