minium.script.js.JsVariablePostProcessor Maven / Gradle / Ivy

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/*
 * Copyright (C) 2015 The Minium Authors
 *
 * 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 minium.script.js;

import java.util.Map;
import java.util.Map.Entry;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
import org.springframework.core.type.MethodMetadata;
import org.springframework.util.MultiValueMap;

import com.google.common.base.Strings;
import com.google.common.collect.Maps;

public class JsVariablePostProcessor implements BeanDefinitionRegistryPostProcessor, BeanFactoryAware {

    private Map> variables = Maps.newHashMap();
    private BeanFactory beanFactory;

    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        this.beanFactory = beanFactory;
    }

    @Override
    public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
        String[] beanDefinitionNames = registry.getBeanDefinitionNames();
        for (String beanDefinitionName : beanDefinitionNames) {
            BeanDefinition beanDefinition = registry.getBeanDefinition(beanDefinitionName);
            if (beanDefinition instanceof AnnotatedBeanDefinition) {
                MethodMetadata metadata = ((AnnotatedBeanDefinition) beanDefinition).getFactoryMethodMetadata();
                if (metadata == null) continue;
                MultiValueMap attrs = metadata.getAllAnnotationAttributes(JsVariable.class.getName());
                if (attrs == null) continue;
                variables.put(beanDefinitionName, attrs);
            }
        }
    }

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        // nothing to do here
    }

    public void populateEngine(JsEngine engine) {
        for (Entry> entry : variables.entrySet()) {
            String beanDefinitionName = entry.getKey();
            MultiValueMap variable = entry.getValue();

            Object bean = beanFactory.getBean(beanDefinitionName);
            String jsVar = (String) variable.getFirst("value");
            String expression = (String) variable.getFirst("expression");
            Boolean deleteAfterExpression = (Boolean) variable.getFirst("deleteAfterExpression");

            if (jsVar == null) jsVar = beanDefinitionName;
            if (bean instanceof Jsonable) {
                engine.putJson(jsVar, ((Jsonable) bean).toJson());
            } else {
                engine.put(jsVar, bean);
            }

            try {
                if (!Strings.isNullOrEmpty(expression)) {
                    engine.eval(expression, 1);
                }
            } finally {
                if (deleteAfterExpression != null && deleteAfterExpression.booleanValue()) {
                    engine.delete(jsVar);
                }
            }
        }
    }
}