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Private implementation of 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.trinidadinternal.skin;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.faces.context.FacesContext;
import org.apache.myfaces.trinidad.logging.TrinidadLogger;
import org.apache.myfaces.trinidad.skin.Skin;
import org.apache.myfaces.trinidad.skin.SkinFactory;
import org.apache.myfaces.trinidad.skin.SkinVersion;
import org.apache.myfaces.trinidadinternal.renderkit.core.xhtml.XhtmlConstants;
/**
* Factory for creating Skin objects.
*
*/
public class SkinFactoryImpl extends SkinFactory
{
/**
* Constructor registers default and custom skins
*/
public SkinFactoryImpl()
{
super();
_skins = new LinkedHashMap();
}
/**
* 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.
*
* A warning will be logged if a previously registered {@link Skin} was replaced, since it could produce
* inconsistent results if the application cached the previously registered Skin.
*
* @param skinId Identifier of the {@link Skin} to register
* @param skin {@link Skin} instance that we are registering
*/
@Override
public void addSkin(
String skinId,
Skin skin)
{
if (skinId == null || skin == null)
{
_LOG.warning("CANNOT_ADD_SKIN");
return;
}
synchronized (_skins)
{
Skin previousValue = _skins.put(skinId, skin);
if (previousValue != null)
_LOG.warning("DUPLICATE_ADD_SKIN_TO_SKIN_FACTORY", skinId);
}
}
/**
* given the skinId, pass back the Skin.
* @param context FacesContext. If not available, pass in null.
* @param skinId
* @return Skin that is in this SkinFactory and has the skinId.
*/
@Override
public Skin getSkin(
FacesContext context,
String skinId)
{
if (skinId == null)
{
_LOG.warning("CANNOT_GET_SKIN_WITH_NULL_SKINID");
return null;
}
Skin skin = null;
synchronized (_skins)
{
if (_skins.containsKey(skinId))
{
skin = _skins.get(skinId);
}
}
return skin;
}
/**
* given the skinFamily and renderKitId, pass back the Skin.
* @param context FacesContext for the request currently being
* processed, or null if none is available.
* @param family skin family of the requested {@link Skin} instance
* @param renderKitId RenderKit identifier of the requested:
* XhtmlConstants.APACHE_TRINIDAD_DESKTOP, XhtmlConstants.APACHE_TRINIDAD_PDA, or
* XhtmlConstants.APACHE_TRINIDAD_PORTLET
* {@link Skin} instance
*/
@Override
public Skin getSkin(
FacesContext context,
String family,
String renderKitId)
{
return getSkin(context, family, renderKitId, null);
}
/**
* Given the skin family, renderKitId, and version, return the best matched skin.
* The skin picking logic is:
* If an exact family, renderKitId, and version (including null or "") is found, return that skin
* Else if the user asks for version "default", return the skin with family and renderKitId with version marked
* default. If version wasn't default and does not match any version for the skins with family and renderKitId,
* then return the 'default' skin if there is one marked or return the last entry in the list
* of matching family/renderKitId skins.
* @param context
* @param family
* @param renderKitId
* @param version The version of the skin you want to return. This can be
* "default", or a version name (e.g., "v1"), or null or ""
* (if you want the skin that does not have a version set).
* @return the best matched Skin given the family, renderKitId, and version.
*/
@Override
public Skin getSkin(
FacesContext context,
String family,
String renderKitId,
String version)
{
// By setting the version to the empty string if version is null, we can
// get the skin that has a matching family and renderkit and has no skin version.
// (A Skin with no version returns SkinVersion.EMPTY_SKIN_VERSION for skin.getVersion(),
// and getName will be "")
if (version == null)
version = "";
// given a skinFamily and a renderKitId, figure out the skinId.
// If we don't have an exact match, use the simple skin that matches the
// renderKitId (simple.desktop or simple.pda)
if (family == null)
throw new NullPointerException("Null skin family");
// default render-kit-id, if needed.
if (renderKitId == null)
renderKitId = XhtmlConstants.APACHE_TRINIDAD_DESKTOP;
// loop through each skin in the SkinFactory
// and see if the family and the renderKitId match
Skin matchingSkin = null;
List matchingSkinList = new ArrayList();
for(Skin skin : _skins.values())
{
if (family.equalsIgnoreCase(skin.getFamily()) &&
renderKitId.equalsIgnoreCase(skin.getRenderKitId()))
{
// exact family+renderKitId match!
matchingSkinList.add(skin);
}
}
if (matchingSkinList.isEmpty())
{
// if we get here, that means we couldn't find an exact
// family/renderKitId match, so return the simple skin
// that matches the renderkitid.
if (_LOG.isWarning())
{
_LOG.warning("CANNOT_FIND_MATCHING_SKIN", new Object[]{family, renderKitId});
}
if (renderKitId.equals(XhtmlConstants.APACHE_TRINIDAD_PORTLET))
matchingSkin = getSkin(context, _SIMPLE_PORTLET);
else if (renderKitId.equals(XhtmlConstants.APACHE_TRINIDAD_PDA))
matchingSkin = getSkin(context, _SIMPLE_PDA);
else
matchingSkin = getSkin(context, _SIMPLE_DESKTOP);
}
else
{
// at this point we know we have something in the matchingSkinList
// which is a list of matching family and renderKitId skins. Now match the version
// to find the best matched skin.
boolean foundMatchingSkin = false;
boolean versionIsDefault = (_DEFAULT.compareToIgnoreCase(version) == 0);
// if the user didn't ask for the 'default' version, then look for the exact match
if (!versionIsDefault)
{
for (Skin skin : matchingSkinList)
{
SkinVersion skinVersion = skin.getVersion();
if (skinVersion != null)
{
String name = skinVersion.getName();
if (version.equals(name))
{
matchingSkin = skin;
break;
}
}
}
}
// matchingSkin will be null if an exact version match (family+renderKitId+exact version) was not found;
// we can have an exact version match if the user asks for null version, and we find a skin with no
// version set.
if (matchingSkin == null || versionIsDefault)
{
// find skin with version= default
matchingSkin = _getDefaultVersionSkin(matchingSkinList);
if (matchingSkin == null)
{
// get the last skin in the matchingSkinList if there is no skin marked default.
matchingSkin = matchingSkinList.get(matchingSkinList.size() -1);
}
else if ((matchingSkin != null) && versionIsDefault)
{
// found the default skin the user wanted
foundMatchingSkin = true;
}
} // end matchingSkin == null || versionIsDefault
else
{
foundMatchingSkin = true;
}
// log messages
if (foundMatchingSkin)
{
if (_LOG.isFine())
_LOG.fine("GET_SKIN_FOUND_SKIN_VERSION",
new Object[]{family, version, matchingSkin.getId()});
}
else
{
if(_LOG.isWarning())
{
if ("".equals(version))
{
_LOG.warning("GET_SKIN_CANNOT_FIND_NO_VERSION",
new Object[]{family, matchingSkin.getId()});
}
else
{
_LOG.warning("GET_SKIN_CANNOT_FIND_SKIN_VERSION",
new Object[]{family, version, matchingSkin.getId()});
}
}
}
}
// If we've got a matching skin, wrap it in a RequestSkinWrapper
// to provide access to request-specific state.
return (matchingSkin == null) ? null : new RequestSkinWrapper(matchingSkin);
}
/**
* Given a list of Skins, find the one that has its SkinVersion set to 'default', if it exists.
* @param matchingSkinList A list of Skins that we will look through to find the 'default'.
* @return Skin with SkinVersion isDefault true, otherwise, null.
*/
private Skin _getDefaultVersionSkin(List matchingSkinList)
{
Skin matchingSkin = null;
for (Skin skin : matchingSkinList)
{
SkinVersion skinVersion = skin.getVersion();
if (skinVersion != null)
{
if (skinVersion.isDefault())
{
matchingSkin = skin;
break;
}
}
}
return matchingSkin;
}
@Override
public Iterator getSkinIds()
{
return (_skins.keySet().iterator());
}
// Stores all the Skins in this SkinFactory
private Map _skins = null;
static private final String _SIMPLE_PDA = "simple.pda";
static private final String _SIMPLE_DESKTOP = "simple.desktop";
static private final String _SIMPLE_PORTLET = "simple.portlet";
static private final String _DEFAULT = "default";
static private final TrinidadLogger _LOG = TrinidadLogger.createTrinidadLogger(SkinFactoryImpl.class);
}