org.springframework.data.mongodb.core.mapping.event.AbstractMongoEventListener.java Source code

Introduction

Here is the source code for org.springframework.data.mongodb.core.mapping.event.AbstractMongoEventListener.java

Source

/*
 * Copyright 2011 by the original author(s).
 *
 * 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 org.springframework.data.mongodb.core.mapping.event;

import com.mongodb.DBObject;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.ApplicationListener;
import org.springframework.core.GenericTypeResolver;

/**
 * Base class to implement domain class specific {@link ApplicationListener}s.
 * 
 * @author Jon Brisbin
 * @author Oliver Gierke
 */
public abstract class AbstractMongoEventListener<E> implements ApplicationListener<MongoMappingEvent<?>> {

    protected final Log LOG = LogFactory.getLog(getClass());
    private final Class<?> domainClass;

    /**
     * Creates a new {@link AbstractMongoEventListener}.
     */
    public AbstractMongoEventListener() {
        Class<?> typeArgument = GenericTypeResolver.resolveTypeArgument(this.getClass(),
                AbstractMongoEventListener.class);
        this.domainClass = typeArgument == null ? Object.class : typeArgument;
    }

    /*
     * (non-Javadoc)
     * @see org.springframework.context.ApplicationListener#onApplicationEvent(org.springframework.context.ApplicationEvent)
     */
    public void onApplicationEvent(MongoMappingEvent<?> event) {

        if (event instanceof AfterLoadEvent) {
            AfterLoadEvent<?> afterLoadEvent = (AfterLoadEvent<?>) event;

            if (domainClass.isAssignableFrom(afterLoadEvent.getType())) {
                onAfterLoad(event.getDBObject());
            }

            return;
        }

        @SuppressWarnings("unchecked")
        E source = (E) event.getSource();

        // Check for matching domain type and invoke callbacks
        if (source != null && !domainClass.isAssignableFrom(source.getClass())) {
            return;
        }

        if (event instanceof BeforeConvertEvent) {
            onBeforeConvert(source);
        } else if (event instanceof BeforeSaveEvent) {
            onBeforeSave(source, event.getDBObject());
        } else if (event instanceof AfterSaveEvent) {
            onAfterSave(source, event.getDBObject());
        } else if (event instanceof AfterConvertEvent) {
            onAfterConvert(event.getDBObject(), source);
        }
    }

    public void onBeforeConvert(E source) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("onBeforeConvert(" + source + ")");
        }
    }

    public void onBeforeSave(E source, DBObject dbo) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("onBeforeSave(" + source + ", " + dbo + ")");
        }
    }

    public void onAfterSave(E source, DBObject dbo) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("onAfterSave(" + source + ", " + dbo + ")");
        }
    }

    public void onAfterLoad(DBObject dbo) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("onAfterLoad(" + dbo + ")");
        }
    }

    public void onAfterConvert(DBObject dbo, E source) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("onAfterConvert(" + dbo + "," + source + ")");
        }
    }
}