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

import javax.xml.stream.XMLStreamException;

/**
 * Represents the base view class for search operations.
 * 
 */
@EditorBrowsable(state = EditorBrowsableState.Never)
public abstract class ViewBase {

	/** The property set. */
	private PropertySet propertySet;

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

	/**
	 * Validates this view.
	 * 
	 * @param request
	 *            The request using this view.
	 * @throws ServiceValidationException
	 *             the service validation exception
	 * @throws ServiceVersionException
	 *             the service version exception
	 */
	protected void internalValidate(ServiceRequestBase request)
			throws ServiceValidationException, ServiceVersionException {
		if (this.getPropertySet() != null) {
			this.getPropertySet().internalValidate();
			this.getPropertySet().validateForRequest(
					request,
					true /* summaryPropertiesOnly */);
		}
	}

	/**
	 * Writes this view to XML.
	 * 
	 * @param writer
	 *            The writer
	 * @throws ServiceXmlSerializationException
	 *             the service xml serialization exception
	 * @throws Exception
	 *             the exception
	 */
	protected void internalWriteViewToXml(EwsServiceXmlWriter writer)
			throws ServiceXmlSerializationException, Exception {
		Integer maxEntriesReturned = this.getMaxEntriesReturned();

		if (maxEntriesReturned != null) {
			writer.writeAttributeValue(XmlAttributeNames.MaxEntriesReturned,
					maxEntriesReturned);
		}
	}

	/**
	 * Writes the search settings to XML.
	 * 
	 * @param writer
	 *            The Writer
	 * @param groupBy
	 *            The group by clause.
	 * @throws XMLStreamException
	 *             the xML stream exception
	 * @throws ServiceXmlSerializationException
	 *             the service xml serialization exception
	 */
	protected abstract void internalWriteSearchSettingsToXml(
			EwsServiceXmlWriter writer, Grouping groupBy)
			throws XMLStreamException, ServiceXmlSerializationException;

	/**
	 * Writes OrderBy property to XML.
	 * 
	 * @param writer
	 *            The Writer
	 * @throws XMLStreamException
	 *             the xML stream exception
	 * @throws ServiceXmlSerializationException
	 *             the service xml serialization exception
	 */
	protected abstract void writeOrderByToXml(EwsServiceXmlWriter writer)
			throws XMLStreamException, ServiceXmlSerializationException;

	/**
	 * Gets the name of the view XML element.
	 * 
	 * @return TheXml Element name
	 */
	protected abstract String getViewXmlElementName();

	/**
	 * Gets the maximum number of items or folders the search operation should
	 * return.
	 * 
	 * @return The maximum number of items or folders that should be returned by
	 *         the search operation.
	 */
	protected abstract Integer getMaxEntriesReturned();

	/**
	 * Gets the type of service object this view applies to.
	 * 
	 * @return A ServiceObjectType value.
	 */
	protected abstract ServiceObjectType getServiceObjectType();

	/**
	 * Writes the attributes to XML.
	 * 
	 * @param writer
	 *            The writer.
	 * @throws ServiceXmlSerializationException
	 *             the service xml serialization exception
	 */
	protected abstract void writeAttributesToXml(EwsServiceXmlWriter writer)
			throws ServiceXmlSerializationException;

	/**
	 * Writes to XML.
	 * 
	 * @param writer
	 *            The writer.
	 * @param groupBy
	 *            The group by clause.
	 * @throws Exception
	 *             the exception
	 */
	protected void writeToXml(EwsServiceXmlWriter writer, Grouping groupBy)
			throws Exception {
		this.getPropertySetOrDefault().writeToXml(writer,
				this.getServiceObjectType());
		writer.writeStartElement(XmlNamespace.Messages, this
				.getViewXmlElementName());
		this.internalWriteViewToXml(writer);
		writer.writeEndElement(); // this.GetViewXmlElementName()
		this.internalWriteSearchSettingsToXml(writer, groupBy);
	}

	/**
	 * Gets the property set or the default.
	 * 
	 * @return PropertySet
	 */
	protected PropertySet getPropertySetOrDefault() {
		if (this.getPropertySet() == null) {
			return PropertySet.getFirstClassProperties();
		} else {
			return this.getPropertySet();
		}
	}

	/**
	 * Gets the property set. PropertySet determines which properties will be
	 * loaded on found items. If PropertySet is null, all first class properties
	 * are loaded on found items.
	 * 
	 * @return the property set
	 */
	public PropertySet getPropertySet() {
		return propertySet;
	}

	/**
	 * Sets the property set. PropertySet determines which properties will be
	 * loaded on found items. If PropertySet is null, all first class properties
	 * are loaded on found items.
	 * 
	 * @param propertySet
	 *            The property set
	 */
	public void setPropertySet(PropertySet propertySet) {
		this.propertySet = propertySet;
	}

}