com.tacitknowledge.flip.spring.config.FeatureServiceHandlerParser.java Source code

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Here is the source code for com.tacitknowledge.flip.spring.config.FeatureServiceHandlerParser.java

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/*
 * 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.spring.config;

import java.util.List;
import java.util.Map;
import java.util.Properties;

import com.tacitknowledge.flip.Environment;
import com.tacitknowledge.flip.FeatureServiceDirectFactory;
import com.tacitknowledge.flip.spring.FlipSpringAspect;
import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.RuntimeBeanNameReference;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.RootBeanDefinition;
import org.springframework.beans.factory.xml.AbstractBeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.util.xml.DomUtils;
import org.w3c.dom.Element;

/**
 * Parses the <code>&lt;flip:feature-service /&gt;</code> declaration in 
 * Spring XML based context.
 * 
 * This Spring Context tag could contain <code>environment</code> attribute
 * which references to {@link Environment} bean. Also it could contain
 * <code>&lt;context-providers&gt;</code> tag with nested Context Providers beans
 * declarations or references to them. In the same style you can set up
 * the property readers in <code>&lt;property-readers&gt;</code>. And in nested tag
 * <code>&lt;properties&gt;</code> with nested <code>bean:prop</code> elements.
 * 
 * @author Serghei Soloviov <ssoloviov@tacitknowledge.com>
 */
public class FeatureServiceHandlerParser extends AbstractBeanDefinitionParser {

    @Override
    protected AbstractBeanDefinition parseInternal(Element element, ParserContext parserContext) {
        BeanDefinitionBuilder factoryBuilder = BeanDefinitionBuilder
                .rootBeanDefinition(FeatureServiceDirectFactory.class);
        RootBeanDefinition factoryBean = (RootBeanDefinition) factoryBuilder.getBeanDefinition();
        parserContext.getRegistry().registerBeanDefinition(FlipSpringAspect.FEATURE_SERVICE_FACTORY_BEAN_NAME,
                factoryBean);

        MutablePropertyValues factoryPropertyValues = new MutablePropertyValues();
        factoryBean.setPropertyValues(factoryPropertyValues);

        String environmentBean = element.getAttribute("environment");
        if (environmentBean != null && !environmentBean.isEmpty()) {
            factoryPropertyValues.addPropertyValue("environment", new RuntimeBeanNameReference(environmentBean));
        }

        Element contextProvidersElement = DomUtils.getChildElementByTagName(element, "context-providers");
        if (contextProvidersElement != null) {
            List contextProvidersList = parserContext.getDelegate().parseListElement(contextProvidersElement,
                    factoryBean);
            if (contextProvidersList != null && !contextProvidersList.isEmpty()) {
                factoryPropertyValues.addPropertyValue("contextProviders", contextProvidersList);
            }
        }

        Element propertyReadersElement = DomUtils.getChildElementByTagName(element, "property-readers");
        if (propertyReadersElement != null && propertyReadersElement.hasChildNodes()) {
            List propertyReadersList = parserContext.getDelegate().parseListElement(propertyReadersElement,
                    factoryBean);
            if (propertyReadersList != null && !propertyReadersList.isEmpty()) {
                factoryPropertyValues.addPropertyValue("propertyReaders", propertyReadersList);
            }
        }

        Element propertiesElement = DomUtils.getChildElementByTagName(element, "properties");
        if (propertiesElement != null && propertiesElement.hasChildNodes()) {
            Properties properties = parserContext.getDelegate().parsePropsElement(propertiesElement);
            if (properties != null && !properties.isEmpty()) {
                factoryPropertyValues.addPropertyValue("properties", properties);
            }
        }

        BeanDefinitionBuilder featureServiceBuilder = BeanDefinitionBuilder.genericBeanDefinition();
        BeanDefinition featureServiceRawBean = featureServiceBuilder.getRawBeanDefinition();
        featureServiceRawBean.setFactoryBeanName(FlipSpringAspect.FEATURE_SERVICE_FACTORY_BEAN_NAME);
        featureServiceRawBean.setFactoryMethodName("createFeatureService");
        parserContext.getRegistry().registerBeanDefinition(FlipSpringAspect.FEATURE_SERVICE_BEAN_NAME,
                featureServiceBuilder.getBeanDefinition());

        return null;
    }

}