/*
 * Copyright 2005-2014 the original author or 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.springframework.xml.namespace;

import java.beans.PropertyEditorSupport;
import javax.xml.namespace.QName;

import org.springframework.util.StringUtils;

/**
 * PropertyEditor for {@code javax.xml.namespace.QName}, to populate a property of type QName from a String value.
 *
 * <p>Expects the syntax
 * <pre>
 * localPart
 * </pre>
 * or
 * <pre>
 * {namespace}localPart
 * </pre>
 * or
 * <pre>
 * {namespace}prefix:localPart
 * </pre>
 * This resembles the {@code toString()} representation of {@code QName} itself, but allows for prefixes to be
 * specified as well.
 *
 * @author Arjen Poutsma
 * @see javax.xml.namespace.QName
 * @see javax.xml.namespace.QName#toString()
 * @see javax.xml.namespace.QName#valueOf(String)
 * @since 1.0.0
 */
public class QNameEditor extends PropertyEditorSupport {

	@Override
	public void setAsText(String text) throws IllegalArgumentException {
		setValue(QNameUtils.parseQNameString(text));
	}

	@Override
	public String getAsText() {
		Object value = getValue();
		if (value == null || !(value instanceof QName)) {
			return "";
		}
		else {
			QName qName = (QName) value;
			String prefix = qName.getPrefix();
			if (StringUtils.hasLength(qName.getNamespaceURI()) && StringUtils.hasLength(prefix)) {
				return "{" + qName.getNamespaceURI() + "}" + prefix + ":" + qName.getLocalPart();
			}
			else if (StringUtils.hasLength(qName.getNamespaceURI())) {
				return "{" + qName.getNamespaceURI() + "}" + qName.getLocalPart();
			}
			else {
				return qName.getLocalPart();
			}
		}
	}
}