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/**************************************************************************
 * copyright file="TimeWindow.java" company="Microsoft"
 *     Copyright (c) Microsoft Corporation.  All rights reserved.
 * 
 * Defines the TimeWindow.java.
 **************************************************************************/
package microsoft.exchange.webservices.data;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.xml.stream.XMLStreamException;

/**
 * Represents a time period.
 * 
 */
public class TimeWindow implements ISelfValidate {

	/** The start time. */
	private Date startTime;

	/** The end time. */
	private Date endTime;

	/**
	 * Initializes a new instance of the "TimeWindow" class.
	 */
	protected TimeWindow() {
	}

	/**
	 * Initializes a new instance of the "TimeWindow" class.
	 * 
	 * @param startTime
	 *            the start time
	 * @param endTime
	 *            the end time
	 */
	public TimeWindow(Date startTime, Date endTime) {
		this();
		this.startTime = startTime;
		this.endTime = endTime;
	}

	/**
	 * Gets the start time.
	 * 
	 * @return the start time
	 */
	public Date getStartTime() {
		return startTime;
	}

	/**
	 * Sets the start time.
	 * 
	 * @param startTime
	 *            the new start time
	 */
	public void setStartTime(Date startTime) {
		this.startTime = startTime;
	}

	/**
	 * Gets the end time.
	 * 
	 * @return the end time
	 */
	public Date getEndTime() {
		return endTime;
	}

	/**
	 * Sets the end time.
	 * 
	 * @param endTime
	 *            the new end time
	 */
	public void setEndTime(Date endTime) {
		this.endTime = endTime;
	}

	/**
	 * Loads from XML.
	 * 
	 * @param reader
	 *            the reader
	 * @throws Exception
	 *             the exception
	 */
	protected void loadFromXml(EwsServiceXmlReader reader) throws Exception {
		reader.ensureCurrentNodeIsStartElement(XmlNamespace.Types,
				XmlElementNames.Duration);

		this.startTime = reader.readElementValueAsDateTime(XmlNamespace.Types,
				XmlElementNames.StartTime);
		this.endTime = reader.readElementValueAsDateTime(XmlNamespace.Types,
				XmlElementNames.EndTime);

		reader.readEndElement(XmlNamespace.Types, XmlElementNames.Duration);
	}

	/**
	 * Writes to XML.
	 * 
	 * @param writer
	 *            the writer
	 * @param xmlElementName
	 *            the xml element name
	 * @param startTime
	 *            the start time
	 * @param endTime
	 *            the end time
	 * @throws XMLStreamException
	 *             the xML stream exception
	 * @throws ServiceXmlSerializationException
	 *             the service xml serialization exception
	 */
	private static void writeToXml(EwsServiceXmlWriter writer,
			String xmlElementName, Object startTime, Object endTime)
			throws XMLStreamException, ServiceXmlSerializationException {
		writer.writeStartElement(XmlNamespace.Types, xmlElementName);

		writer.writeElementValue(XmlNamespace.Types, XmlElementNames.StartTime,
				startTime);

		writer.writeElementValue(XmlNamespace.Types, XmlElementNames.EndTime,
				endTime);

		writer.writeEndElement(); // xmlElementName
	}

	/**
	 * Writes to XML without scoping the dates and without emitting times.
	 * 
	 * @param writer
	 *            the writer
	 * @param xmlElementName
	 *            the xml element name
	 * @throws XMLStreamException
	 *             the xML stream exception
	 * @throws ServiceXmlSerializationException
	 *             the service xml serialization exception
	 */
	protected void writeToXmlUnscopedDatesOnly(EwsServiceXmlWriter writer,
			String xmlElementName) throws XMLStreamException,
			ServiceXmlSerializationException {
		final String DateOnlyFormat = "yyyy-MM-dd'T'00:00:00";

		DateFormat formatter = new SimpleDateFormat(DateOnlyFormat);

		String start = formatter.format(this.startTime);
		String end = formatter.format(this.endTime);
		TimeWindow.writeToXml(writer, xmlElementName, start, end);
	}

	/**
	 * Writes to XML.
	 * 
	 * @param writer
	 *            the writer
	 * @param xmlElementName
	 *            the xml element name
	 * @throws XMLStreamException
	 *             the xML stream exception
	 * @throws ServiceXmlSerializationException
	 *             the service xml serialization exception
	 */
	protected void writeToXml(EwsServiceXmlWriter writer, String xmlElementName)
			throws XMLStreamException, ServiceXmlSerializationException {
		TimeWindow.writeToXml(writer, xmlElementName, this.startTime,
				this.endTime);
	}

	/**
	 * Gets the duration.
	 * 
	 * @return the duration
	 */
	protected long getDuration() {
		return this.endTime.getTime() - this.startTime.getTime();
	}

	/**
	 * Validates this instance.
	 */
	public void validate() {
		/*
		 * if (this.startTime >= this.endTime) { throw new
		 * ArgumentException(Strings
		 * .TimeWindowStartTimeMustBeGreaterThanEndTime); }
		 */
	}
}