/*
* Copyright 2002-2016 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 org.springframework.integration.twitter.outbound;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.Expression;
import org.springframework.expression.TypeLocator;
import org.springframework.expression.spel.support.StandardTypeLocator;
import org.springframework.integration.expression.ExpressionUtils;
import org.springframework.integration.handler.AbstractMessageHandler;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHandlingException;
import org.springframework.social.twitter.api.Tweet;
import org.springframework.social.twitter.api.TweetData;
import org.springframework.social.twitter.api.Twitter;
import org.springframework.util.Assert;
/**
* MessageHandler for sending regular status updates as well as 'replies' or 'mentions'.
*
* @author Josh Long
* @author Oleg Zhurakousky
* @author Artem Bilan
* @since 2.0
*/
public class StatusUpdatingMessageHandler extends AbstractMessageHandler {
private final Twitter twitter;
private volatile Expression tweetDataExpression;
private EvaluationContext evaluationContext;
public StatusUpdatingMessageHandler(Twitter twitter) {
Assert.notNull(twitter, "twitter must not be null");
this.twitter = twitter;
}
@Override
public String getComponentType() {
return "twitter:outbound-channel-adapter";
}
/**
* An expression that is used to build the {@link TweetData}; must resolve to a
* {@link TweetData} object, or a {@link String}, or a {@link Tweet}.
* <p> When using a {@code TweetData} directly in the expression, it is not necessary
* to include the package:
* {@code "new TweetData("test").withMedia(headers.mediaResource).displayCoordinates(true)")}.
* @param tweetDataExpression The expression.
* @since 4.0
*/
public void setTweetDataExpression(Expression tweetDataExpression) {
this.tweetDataExpression = tweetDataExpression;
}
public void setIntegrationEvaluationContext(EvaluationContext evaluationContext) {
this.evaluationContext = evaluationContext;
}
@Override
protected void onInit() throws Exception {
super.onInit();
if (this.evaluationContext == null) {
this.evaluationContext = ExpressionUtils.createStandardEvaluationContext(getBeanFactory());
TypeLocator typeLocator = this.evaluationContext.getTypeLocator();
if (typeLocator instanceof StandardTypeLocator) {
/*
* Register the twitter api package so they don't need a FQCN for TweetData.
*/
((StandardTypeLocator) typeLocator).registerImport("org.springframework.social.twitter.api");
}
}
}
@Override
protected void handleMessageInternal(Message<?> message) throws Exception {
Object value;
if (this.tweetDataExpression != null) {
value = this.tweetDataExpression.getValue(this.evaluationContext, message);
}
else {
value = message.getPayload();
}
Assert.notNull(value, "The tweetData cannot evaluate to 'null'.");
TweetData tweetData = null;
if (value instanceof TweetData) {
tweetData = (TweetData) value;
}
else if (value instanceof Tweet) {
tweetData = new TweetData(((Tweet) value).getText());
}
else if (value instanceof String) {
tweetData = new TweetData((String) value);
}
else {
throw new MessageHandlingException(message, "Unsupported tweetData: " + value);
}
this.twitter.timelineOperations().updateStatus(tweetData);
}
}