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/*
* Copyright 2000-2014 Vaadin Ltd.
*
* 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 com.vaadin.ui.declarative;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
/**
* This class contains contextual information that is collected when a component
* tree is constructed based on HTML design template
*
* @since 7.4
* @author Vaadin Ltd
*/
public class DesignContext {
// cache for object instances
private static Map<Class<?>, Object> instanceCache = Collections
.synchronizedMap(new HashMap<Class<?>, Object>());
/**
* Returns the default instance for the given class. The instance must not
* be modified by the caller.
*
* @since
* @param instanceClass
* @return
*/
public <T> T getDefaultInstance(Class<T> instanceClass) {
T instance = (T) instanceCache.get(instanceClass);
if (instance == null) {
try {
instance = instanceClass.newInstance();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
instanceCache.put(instanceClass, instance);
}
return instance;
}
}
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