package org.apache.helix.model.builder;
/*
* 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
* 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.
*/
import java.util.Map;
import java.util.TreeMap;
import org.apache.helix.model.ConstraintItem;
import org.apache.helix.model.ClusterConstraints.ConstraintAttribute;
import org.apache.helix.model.ClusterConstraints.ConstraintValue;
import org.apache.log4j.Logger;
public class ConstraintItemBuilder {
private static Logger LOG = Logger.getLogger(ConstraintItemBuilder.class);
// attributes e.g. {STATE:MASTER, RESOURCE:TestDB, INSTANCE:localhost_12918}
final Map<ConstraintAttribute, String> _attributes = new TreeMap<ConstraintAttribute, String>();
String _constraintValue = null;
/**
* add an attribute to constraint-item, overwrite if already exists
*
* @param attribute
* @param value
*/
public ConstraintItemBuilder addConstraintAttribute(String attribute, String value) {
// make sure constraint attribute is valid
try {
ConstraintAttribute attr = ConstraintAttribute.valueOf(attribute.toUpperCase());
if (attr == ConstraintAttribute.CONSTRAINT_VALUE) {
// make sure constraint-value is valid
try
{
ConstraintValue.valueOf(value);
if (_constraintValue == null) {
LOG.info("overwrite existing constraint-value. old-value: " + _constraintValue
+ ", new-value: " + value);
}
_constraintValue = value;
} catch (IllegalArgumentException e)
{
try
{
Integer.parseInt(value);
if (_constraintValue == null) {
LOG.info("overwrite existing constraint-value. old-value: " + _constraintValue
+ ", new-value: " + value);
}
_constraintValue = value;
}
catch (NumberFormatException ne)
{
LOG.error("fail to add constraint attribute. Invalid constraintValue. "
+ attribute + ": " + attribute + ", value: " + value);
}
}
} else {
if (_attributes.containsKey(attr)) {
LOG.info("overwrite existing constraint attribute. attribute: "
+ attribute + ", old-value: " + _attributes.get(attr) + ", new-value: " + value);
}
_attributes.put(attr, value);
}
} catch (IllegalArgumentException e) {
LOG.error("fail to add constraint attribute. Invalid attribute type. attribute: "
+ attribute + ", value: " + value);
}
return this;
}
public ConstraintItemBuilder addConstraintAttributes(Map<String, String> attributes) {
for (String attr : attributes.keySet()) {
addConstraintAttribute(attr, attributes.get(attr));
}
return this;
}
public Map<ConstraintAttribute, String> getAttributes() {
return _attributes;
}
public String getConstraintValue() {
return _constraintValue;
}
public ConstraintItem build() {
// TODO: check if constraint-item is valid
return new ConstraintItem(_attributes, _constraintValue);
}
}