// Copyright 2017 JanusGraph 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.janusgraph.core.schema;
import com.google.common.base.Preconditions;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.builder.HashCodeBuilder;
/**
* Simple class to represent arbitrary parameters as key-value pairs.
* Parameters are used in configuration and definitions.
*
* @author Matthias Broecheler (me@matthiasb.com)
*/
public class Parameter<V> {
private String key;
private V value;
public Parameter(String key, V value) {
Preconditions.checkArgument(StringUtils.isNotBlank(key),"Invalid key");
this.key = key;
this.value = value;
}
public static<V> Parameter<V> of(String key, V value) {
return new Parameter(key,value);
}
public String key() {
return key;
}
public V value() {
return value;
}
@Override
public int hashCode() {
return new HashCodeBuilder().append(key).append(value).toHashCode();
}
@Override
public boolean equals(Object oth) {
if (this==oth) return true;
if (oth==null || !getClass().isInstance(oth)) return false;
Parameter other = (Parameter)oth;
return key.equals(other.key) && (value==other.value || (value!=null && value.equals(other.value)));
}
@Override
public String toString() {
return key+"->"+String.valueOf(value);
}
}