DoubleArrayPropertyPersistenceHandler.java example

Explorer
gda-dal-master
/* 
 * Copyright (c) 2006 Stiftung Deutsches Elektronen-Synchroton, 
 * Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY.
 *
 * THIS SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "../AS IS" BASIS. 
 * WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED 
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE AND 
 * NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. SHOULD THE SOFTWARE PROVE DEFECTIVE 
 * IN ANY RESPECT, THE USER ASSUMES THE COST OF ANY NECESSARY SERVICING, REPAIR OR 
 * CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. 
 * NO USE OF ANY SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
 * DESY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, 
 * OR MODIFICATIONS.
 * THE FULL LICENSE SPECIFYING FOR THE SOFTWARE THE REDISTRIBUTION, MODIFICATION, 
 * USAGE AND OTHER RIGHTS AND OBLIGATIONS IS INCLUDED WITH THE DISTRIBUTION OF THIS 
 * PROJECT IN THE FILE LICENSE.HTML. IF THE LICENSE IS NOT INCLUDED YOU MAY FIND A COPY 
 * AT HTTP://WWW.DESY.DE/LEGAL/LICENSE.HTM
 */
package org.csstudio.sds.internal.persistence;

import java.util.ArrayList;

import org.jdom.Element;

/**
 * Persistence handler for the property type <code>sds.doublearray</code>.
 * 
 * @author Alexander Will
 * @version $Revision: 1.1 $
 * 
 */
public final class DoubleArrayPropertyPersistenceHandler extends
		AbstractPropertyPersistenceHandler {

	/**
	 * XML tag name <code>double</code>.
	 */
	public static final String XML_ELEMENT_DOUBLE = "double"; //$NON-NLS-1$

	/**
	 * XML tag name <code>doubleArray</code>.
	 */
	public static final String XML_ELEMENT_DOUBLE_ARRAY = "doubleArray"; //$NON-NLS-1$

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void writeProperty(final Element domElement,
			final Object propertyValue) {
		double[] doubleArray = (double[]) propertyValue;

		Element arrayElement = new Element(XML_ELEMENT_DOUBLE_ARRAY);

		for (double d : doubleArray) {
			Element doubleElement = new Element(XML_ELEMENT_DOUBLE);
			doubleElement
					.setAttribute(XmlConstants.XML_ATTRIBUTE_VALUE, "" + d); //$NON-NLS-1$
			arrayElement.addContent(doubleElement);
		}

		domElement.addContent(arrayElement);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public Object readProperty(final Element domElement) {
		ArrayList<Double> values = new ArrayList<Double>();

		Element doubleArrayElement = domElement
				.getChild(XML_ELEMENT_DOUBLE_ARRAY);

		for (Object o : doubleArrayElement.getChildren(XML_ELEMENT_DOUBLE)) {
			Element valueElement = (Element) o;
			values.add(Double.parseDouble(valueElement
					.getAttributeValue(XmlConstants.XML_ATTRIBUTE_VALUE)));
		}

		double[] result = new double[values.size()];
		int i = 0;
		for (Double d : values) {
			result[i] = d;
			i++;
		}
		return result;
	}
}