org.dmg.pmml.FieldName Maven / Gradle / Ivy
/*
* Copyright (c) 2013 Villu Ruusmann
*/
package org.dmg.pmml;
import java.io.Serializable;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonValue;
@JsonAutoDetect (
fieldVisibility = JsonAutoDetect.Visibility.ANY,
getterVisibility = JsonAutoDetect.Visibility.NONE,
isGetterVisibility = JsonAutoDetect.Visibility.NONE,
setterVisibility = JsonAutoDetect.Visibility.NONE
)
final
public class FieldName implements Serializable {
@JsonValue
private String value = null;
private FieldName(String value){
setValue(value);
}
@Override
public int hashCode(){
return (this.getValue()).hashCode();
}
@Override
public boolean equals(Object object){
if(object == this){
return true;
} // End if
if(object instanceof FieldName){
FieldName that = (FieldName)object;
return (this.getValue()).equals(that.getValue());
}
return false;
}
@Override
public String toString(){
return getValue();
}
public String getValue(){
return this.value;
}
private void setValue(String value){
if(value == null){
throw new NullPointerException();
}
this.value = value;
}
/**
* Replaces this newly deserialized {@link FieldName} instance with the singleton one.
*
* @see Serializable
*/
final
Object readResolve(){
return create(getValue());
}
@JsonCreator
static
public FieldName create(String value){
if(value == null){
throw new NullPointerException();
} else
if(("").equals(value)){
throw new IllegalArgumentException("Name cannot be empty");
}
Map cache = FieldName.CACHE_PROVIDER.get();
FieldName name = cache.get(value);
if(name == null){
name = new FieldName(value);
FieldName prevName = cache.putIfAbsent(value, name);
if(prevName != null){
return prevName;
}
}
return name;
}
public static final Map CACHE = new ConcurrentHashMap<>(2048);
public static final ThreadLocal> CACHE_PROVIDER = new ThreadLocal>(){
@Override
protected Map initialValue(){
return FieldName.CACHE;
}
};
}