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Resource merging for Apache Wicket (http://wicket.apache.org), see http://talk-on-tech.blogspot.com/2008/08/wicket-interface-speed-up-merging.html

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/**
 * Copyright 2010 Molindo GmbH
 *
 * 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.wicketstuff.mergedresources.versioning;

import org.apache.wicket.Application;

public class WicketVersion extends AbstractResourceVersion {
	private static final long serialVersionUID = 1L;

	private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(WicketVersion.class);

	private String _version;

	public WicketVersion(Application application) {
		_version = application.getFrameworkSettings().getVersion();
		if ("n/a".equals(_version)) {
			log.info("failed to determine wicket framework version");
			_version = null;
		}
	}

	@Override
	protected int compareValid(AbstractResourceVersion o) throws IncompatibleVersionsException {
		if (o instanceof WicketVersion) {
			return 0;
		} else {
			throw new IncompatibleVersionsException(this, o);
		}
	}

	@Override
	public String getVersion() {
		return _version;
	}

	@Override
	public boolean isValid() {
		return _version != null;
	}

}