/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
*
* 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.apache.streams.facebook.provider;
import org.apache.streams.facebook.Page;
import org.apache.streams.facebook.Post;
import org.apache.streams.jackson.StreamsJacksonMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.google.common.base.Preconditions;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.Objects;
/**
* FacebookEventClassifier classifies facebook events.
*/
public class FacebookEventClassifier {
private static final Logger LOGGER = LoggerFactory.getLogger(FacebookEventClassifier.class);
/**
* detectClass from json string.
* @param json json string
* @return detected Class
*/
public static Class detectClass( String json ) {
Objects.requireNonNull(json);
Preconditions.checkArgument(StringUtils.isNotEmpty(json));
ObjectNode objectNode;
try {
objectNode = (ObjectNode) StreamsJacksonMapper.getInstance().readTree(json);
} catch (IOException ex) {
LOGGER.error("Exception while trying to detect class: {}", ex.getMessage());
return null;
}
if ( objectNode.findValue("about") != null) {
return Page.class;
} else if ( objectNode.findValue("statusType") != null ) {
return Post.class;
} else {
return Post.class;
}
}
}