taverna-reference-types/src/main/java/org/apache/taverna/reference/impl/external/http/UrlToHttpReference.java

/*
* 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.
*/

package org.apache.taverna.reference.impl.external.http;

import java.net.URL;

import org.apache.taverna.reference.ExternalReferenceSPI;
import org.apache.taverna.reference.ReferenceContext;
import org.apache.taverna.reference.ValueToReferenceConversionException;
import org.apache.taverna.reference.ValueToReferenceConverterSPI;

/**
 * Convert a URL with http protocol to a HttpReference reference type
 * 
 * @author Tom Oinn
 * 
 */
public class UrlToHttpReference implements ValueToReferenceConverterSPI {
	/**
	 * Can convert if the object is an instance of java.net.URL and the protocol
	 * is HTTP
	 */
	@Override
	public boolean canConvert(Object o, ReferenceContext context) {
		if (o instanceof URL) {
			String protocol = ((URL) o).getProtocol();
			if (protocol.equalsIgnoreCase("http") || protocol.equals("https"))
				return true;
		}
		return false;
	}

	/**
	 * Return a new HttpReference constructed from
	 * <code>((URL)o).toExternalForm()</code>
	 */
	@Override
	public ExternalReferenceSPI convert(Object o, ReferenceContext context)
			throws ValueToReferenceConversionException {
		HttpReference result = new HttpReference();
		result.setHttpUrlString(((URL) o).toExternalForm());
		return result;
	}
}