/* Copyright 2012 Tacit Knowledge
*
* 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.tacitknowledge.flip;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.tacitknowledge.flip.context.ContextManager;
import com.tacitknowledge.flip.exceptions.FlipException;
import com.tacitknowledge.flip.model.FeatureDescriptor;
import com.tacitknowledge.flip.model.FeatureState;
import com.tacitknowledge.flip.properties.PropertyManager;
/**
* Implementation of {@link FeatureService} contract
*
* @author Serghei Soloviov <ssoloviov@tacitknowledge.com>
* @author Petric Coroli <pcoroli@tacitknowledge.com>
*/
public class FeatureServiceImpl implements FeatureService
{
private static final String FEATURE_HIERARCHY_SEPARATOR = ".";
private static final Logger logger = Logger.getLogger(FeatureServiceImpl.class.getName());
private final ContextManager contextManager;
private final PropertyManager propertyManager;
/**
* Constructor that in addition to entity instantiation
* fetches required information from provided {@link Environment}.
*
* @param environment {@link Environment} entity that contains required information
* for {@link ContextManager} and {@link PropertyManager} creation.
*/
public FeatureServiceImpl(final Environment environment)
{
contextManager = new ContextManager(environment);
propertyManager = new PropertyManager(environment);
}
@Override
public FeatureState getFeatureState(final String name)
{
FeatureState result;
try
{
final FeatureDescriptor featureDescriptor = propertyManager.getFeatureDescriptor(name);
result = featureDescriptor.process(contextManager);
}
catch (final FlipException ex)
{
logger.log(
Level.WARNING,
String.format(
"An exception has occured during Feature State extraction for feature named [%s]. Using [%s] value.",
name, FeatureState.DISABLED.toString()), ex);
result = FeatureState.DISABLED;
}
if (isFeatureHasParent(name))
{
final FeatureState parentResult = getFeatureState(getParentFeatureName(name));
result = FeatureState.getByState(parentResult.state() && result.state());
}
return result;
}
/**
* Identifies whether provided feature name has parent feature.
*
* @param name feature name
* @return <code>true</code> in case provided feature name has parent feature,
* <code>false</code> - otherwise.
*/
private boolean isFeatureHasParent(final String name)
{
return name.contains(FEATURE_HIERARCHY_SEPARATOR);
}
private String getParentFeatureName(final String name)
{
final int i = name.lastIndexOf(FEATURE_HIERARCHY_SEPARATOR);
return name.substring(0, i);
}
}