/*
* Copyright 2013 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.xd.dirt.event;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.springframework.context.ApplicationEvent;
/**
* @author Mark Fisher
*/
@SuppressWarnings("serial")
public abstract class AbstractEvent<S> extends ApplicationEvent {
private final Map<String, String> attributes = new HashMap<String, String>();
public AbstractEvent(S source) {
super(source);
}
@Override
@SuppressWarnings("unchecked")
public S getSource() {
return (S) super.getSource();
}
public final String getType() {
String name = this.getClass().getSimpleName();
return name.replace("Event", "");
}
public final Map<String, String> getAttributes() {
return Collections.unmodifiableMap(this.attributes);
}
public void setAttribute(String key, String value) {
this.attributes.put(key, value);
}
@Override
public String toString() {
// TODO: customize a Jackson mapper to replace this manual serialization code
StringBuilder sb = new StringBuilder();
sb.append("{\"timestamp\":" + this.getTimestamp() + ",");
sb.append("\"type\":\"" + getType() + "\"");
sb.append("}");
return sb.toString();
}
}