com.frank.search.solr.core.mapping.SolrMappingEventPublisher.java Source code

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Here is the source code for com.frank.search.solr.core.mapping.SolrMappingEventPublisher.java

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/*
 * Copyright 2014-2015 the original author or 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 com.frank.search.solr.core.mapping;

import com.frank.search.solr.core.schema.SolrPersistentEntitySchemaCreator;
import org.springframework.beans.BeanUtils;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.data.mapping.context.MappingContextEvent;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;

import java.lang.reflect.Constructor;

/**
 * @author Christoph Strobl
 * @since 1.3
 */
public class SolrMappingEventPublisher implements ApplicationEventPublisher {

    static final String SPRING_42_PAYLOAD_APPLICATION_EVENT_CLASS_NAME = "org.springframework.context.PayloadApplicationEvent";
    static final boolean SPRING_42_PAYLOAD_APPLICATION_EVENT_PRESENT = ClassUtils
            .isPresent(SPRING_42_PAYLOAD_APPLICATION_EVENT_CLASS_NAME, null);

    SolrPersistentEntitySchemaCreator schmeaCreator;

    public SolrMappingEventPublisher(SolrPersistentEntitySchemaCreator schemaCreator) {
        this.schmeaCreator = schemaCreator;
    }

    /*
     * (non-Javadoc)
     * @see org.springframework.context.ApplicationEventPublisher#publishEvent(org.springframework.context.ApplicationEvent)
     */
    @SuppressWarnings("unchecked")
    @Override
    public void publishEvent(ApplicationEvent event) {

        if (event instanceof MappingContextEvent) {
            this.schmeaCreator.onApplicationEvent(
                    (MappingContextEvent<SolrPersistentEntity<?>, SolrPersistentProperty>) event);
        }
    }

    /* 
     * (non-Javadoc)
     * @see org.springframework.context.ApplicationEventPublisher#publishEvent(java.lang.Object)
     */
    public void publishEvent(Object event) {

        Assert.notNull(event, "Event to publish must not be null!");

        publishEvent(initGenericApplicationEvent(event));
    }

    @SuppressWarnings("serial")
    private ApplicationEvent initGenericApplicationEvent(Object event) {

        ApplicationEvent applicationEvent = null;

        if (event instanceof ApplicationEvent) {
            applicationEvent = ((ApplicationEvent) event);
        }

        if (SPRING_42_PAYLOAD_APPLICATION_EVENT_PRESENT) {

            try {

                Constructor<?> ctor = ClassUtils.getConstructorIfAvailable(ClassUtils
                        .forName(SPRING_42_PAYLOAD_APPLICATION_EVENT_CLASS_NAME, this.getClass().getClassLoader()),
                        Object.class, Object.class);
                applicationEvent = (ApplicationEvent) BeanUtils.instantiateClass(ctor, (Object) this, event);
            } catch (Exception e) {
                // ignore and fall back to ApplicationEvent
            }
        }

        if (applicationEvent == null) {
            applicationEvent = new ApplicationEvent(event) {
            };
        }
        return applicationEvent;
    }
}