/*
* =============================================================================
*
* Copyright (c) 2011-2016, The THYMELEAF team (http://www.thymeleaf.org)
*
* Licensed 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.thymeleaf.engine;
import java.util.Map;
import org.thymeleaf.IEngineConfiguration;
import org.thymeleaf.context.IContext;
import org.thymeleaf.context.IEngineContext;
import org.thymeleaf.context.IEngineContextFactory;
/**
* <p>
* Static manager class for creating suitable {@link IEngineContext} objects from existing {@link IContext}
* context objects if needed, as well as making sure the adequate template resolution objects are set into
* these context objects.
* </p>
*
* @author Daniel Fernández
* @since 3.0.0
*
*/
final class EngineContextManager {
static IEngineContext prepareEngineContext(
final IEngineConfiguration configuration,
final TemplateData templateData, final Map<String, Object> templateResolutionAttributes,
final IContext context) {
final IEngineContext engineContext =
createEngineContextIfNeeded(configuration, templateData, templateResolutionAttributes, context);
// We will always do this, even if the context is a new object (in which case it would be completely needed)
// because we want to make sure the 'disposeEngineContext' call that will come afterwards can safely
// decrease the level
engineContext.increaseLevel();
if (context instanceof IEngineContext) {
// Set the template resolution into the context, but only if we haven't just created it
engineContext.setTemplateData(templateData);
}
return engineContext;
}
static void disposeEngineContext(final IEngineContext engineContext) {
engineContext.decreaseLevel();
}
private static IEngineContext createEngineContextIfNeeded(
final IEngineConfiguration configuration,
final TemplateData templateData, final Map<String, Object> templateResolutionAttributes,
final IContext context) {
if (context instanceof IEngineContext) {
// If this context is already an IEngineContext, we will not clone it
return (IEngineContext) context;
}
// It's the engine context factory the one who has the responsibility of creating the specific
// implementation of the engine context needed.
final IEngineContextFactory engineContextFactory = configuration.getEngineContextFactory();
return engineContextFactory.createEngineContext(
configuration, templateData, templateResolutionAttributes, context);
}
private EngineContextManager() {
super();
}
}