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JPMML class model evaluator
There is a newer version: 1.7.2
/*
 * Copyright (c) 2014 Villu Ruusmann
 *
 * This file is part of JPMML-Evaluator
 *
 * JPMML-Evaluator is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JPMML-Evaluator is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with JPMML-Evaluator.  If not, see .
 */
package org.jpmml.evaluator;

import java.lang.reflect.Field;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.List;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

import org.dmg.pmml.PMMLObject;

public class XPathUtil {

	private XPathUtil(){
	}

	static
	public String formatElement(Class elementClazz){
		return getElementName(elementClazz);
	}

	static
	public String formatElementOrAttribute(Field field){
		return formatElementOrAttribute((Class)field.getDeclaringClass(), field);
	}

	static
	public String formatElementOrAttribute(Class elementClazz, Field field){
		XmlElement element = field.getAnnotation(XmlElement.class);
		XmlAttribute attribute = field.getAnnotation(XmlAttribute.class);

		if(element != null){
			Class childElementClazz = field.getType();

			if(List.class.isAssignableFrom(childElementClazz)){
				ParameterizedType listType = (ParameterizedType)field.getGenericType();

				Type[] typeArguments = listType.getActualTypeArguments();
				if(typeArguments.length != 1){
					throw new IllegalArgumentException();
				}

				childElementClazz = (Class)typeArguments[0];
			}

			return getElementName(elementClazz) + "/" + getElementName(childElementClazz);
		} else

		if(attribute != null){
			return getElementName(elementClazz) + "@" + attribute.name();
		}

		throw new IllegalArgumentException();
	}

	static
	public String formatAttribute(Field field, Object value){
		return formatAttribute((Class)field.getDeclaringClass(), field, value);
	}

	static
	public String formatAttribute(Class elementClazz, Field field, Object value){
		XmlAttribute attribute = field.getAnnotation(XmlAttribute.class);

		if(attribute != null){
			return formatElementOrAttribute(elementClazz, field) + (value != null ? ("=" + String.valueOf(value)) : "");
		}

		throw new IllegalArgumentException();
	}

	static
	private String getElementName(Class clazz){

		while(clazz != null){
			XmlRootElement rootElement = clazz.getAnnotation(XmlRootElement.class);

			if(rootElement != null){
				return rootElement.name();
			}

			clazz = clazz.getSuperclass();
		}

		throw new IllegalArgumentException();
	}
}