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/*
* ============LICENSE_START=======================================================
* ONAP Policy Engine - Common Modules
* ================================================================================
* Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.endpoints.event.comm.bus;
import java.util.Properties;
/**
* Builder of properties used when configuring topics.
*/
public class TopicPropertyBuilder {
private final Properties properties = new Properties();
private final String prefix;
private String topicPrefix;
/**
* Constructs the object.
*
* @param prefix the prefix for the properties to be built
*/
public TopicPropertyBuilder(String prefix) {
this.prefix = prefix;
properties.setProperty(prefix, "");
}
/**
* Constructs the properties from the builder.
*
* @return a copy of the properties
*/
public Properties build() {
Properties props = new Properties();
props.putAll(properties);
return props;
}
/**
* Adds a topic to the list of topics. Also sets the current topic so that subsequent
* invocations of property methods will manipulate the topic's properties.
*
* @param topic the topic to be added
* @return this builder
*/
public TopicPropertyBuilder addTopic(String topic) {
// add topic to the list of topics
String topicList = properties.getProperty(prefix);
if (!topicList.isEmpty()) {
topicList += ",";
}
topicList += topic;
properties.setProperty(prefix, topicList);
setTopic(topic);
return this;
}
/**
* Sets the topic for which subsequent properties will be managed.
*
* @param topic the topic
* @return this builder
*/
public TopicPropertyBuilder setTopic(String topic) {
this.topicPrefix = prefix + "." + topic;
return this;
}
/**
* Sets a topic's property.
*
* @param name name of the property
* @param value value to which the property should be set
* @return this builder
*/
public TopicPropertyBuilder setTopicProperty(String name, Object value) {
properties.setProperty(topicPrefix + name, value.toString());
return this;
}
/**
* Removes a topic's property.
*
* @param name name of the property
* @return this builder
*/
public TopicPropertyBuilder removeTopicProperty(String name) {
properties.remove(topicPrefix + name);
return this;
}
}
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