/*
 * The MIT License
 * Copyright (c) 2012 Microsoft Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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.
 */

package microsoft.exchange.webservices.data.search;

import microsoft.exchange.webservices.data.attribute.EditorBrowsable;
import microsoft.exchange.webservices.data.core.EwsServiceXmlWriter;
import microsoft.exchange.webservices.data.core.XmlAttributeNames;
import microsoft.exchange.webservices.data.core.request.ServiceRequestBase;
import microsoft.exchange.webservices.data.core.enumeration.attribute.EditorBrowsableState;
import microsoft.exchange.webservices.data.core.enumeration.search.OffsetBasePoint;
import microsoft.exchange.webservices.data.core.exception.service.local.ServiceValidationException;
import microsoft.exchange.webservices.data.core.exception.service.local.ServiceVersionException;
import microsoft.exchange.webservices.data.core.exception.service.local.ServiceXmlSerializationException;

import javax.xml.stream.XMLStreamException;

/**
 * Represents a view settings that support paging in a search operation.
 */
@EditorBrowsable(state = EditorBrowsableState.Never)
public abstract class PagedView extends ViewBase {

  /**
   * The page size.
   */
  private int pageSize;

  /**
   * The offset base point.
   */
  private OffsetBasePoint offsetBasePoint = OffsetBasePoint.Beginning;

  /**
   * The offset.
   */
  private int offset;

  /**
   * Write to XML.
   *
   * @param writer The Writer
   * @throws Exception the exception
   */
  @Override
  protected void internalWriteViewToXml(EwsServiceXmlWriter writer)
      throws Exception {
    super.internalWriteViewToXml(writer);

    writer.writeAttributeValue(XmlAttributeNames.Offset, this.getOffset());
    writer.writeAttributeValue(XmlAttributeNames.BasePoint, this
        .getOffsetBasePoint());
  }

  /**
   * Gets the maximum number of item or folder the search operation should
   * return.
   *
   * @return The maximum number of item or folder that should be returned by
   * the search operation.
   */
  @Override
  protected Integer getMaxEntriesReturned() {
    return this.getPageSize();
  }

  /**
   * Internals the write 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
   */
  @Override
  protected void internalWriteSearchSettingsToXml(EwsServiceXmlWriter writer,
      Grouping groupBy) throws XMLStreamException,
      ServiceXmlSerializationException {
    if (groupBy != null) {
      groupBy.writeToXml(writer);
    }
  }

  /**
   * Writes OrderBy property to XML.
   *
   * @param writer the writer
   * @throws XMLStreamException the XML stream exception
   * @throws ServiceXmlSerializationException the service xml serialization exception
   */
  @Override public void writeOrderByToXml(EwsServiceXmlWriter writer)
      throws XMLStreamException, ServiceXmlSerializationException {
    // No order by for paged view
  }

  /**
   * Validates this view.
   *
   * @param request The request using this view.
   * @throws ServiceVersionException    the service version exception
   * @throws ServiceValidationException the service validation exception
   */
  @Override public void internalValidate(ServiceRequestBase request)
      throws ServiceVersionException, ServiceValidationException {
    super.internalValidate(request);
  }

  /**
   * Initializes a new instance of the "PagedView" class.
   *
   * @param pageSize The maximum number of elements the search operation should
   *                 return.
   */
  protected PagedView(int pageSize) {
    super();
    this.setPageSize(pageSize);
  }

  /**
   * Initializes a new instance of the "PagedView" class.
   *
   * @param pageSize The maximum number of elements the search operation should
   *                 return.
   * @param offset   The offset of the view from the base point.
   */
  protected PagedView(int pageSize, int offset) {
    this(pageSize);
    this.setOffset(offset);
  }

  /**
   * Initializes a new instance of the "PagedView" class.
   *
   * @param pageSize        The maximum number of elements the search operation should
   *                        return.
   * @param offset          The offset of the view from the base point.
   * @param offsetBasePoint The base point of the offset.
   */
  protected PagedView(int pageSize, int offset,
      OffsetBasePoint offsetBasePoint) {
    this(pageSize, offset);
    this.setOffsetBasePoint(offsetBasePoint);
  }

  /**
   * Gets the maximum number of item or folder the search operation should
   * return.
   *
   * @return the page size
   */
  public int getPageSize() {
    return pageSize;
  }

  /**
   * Sets the maximum number of item or folder the search operation should
   * return.
   *
   * @param pageSize the new page size
   */
  public void setPageSize(int pageSize) {
    if (pageSize <= 0) {
      throw new IllegalArgumentException("The value must be greater than 0.");
    }
    this.pageSize = pageSize;
  }

  /**
   * Gets the base point of the offset.
   *
   * @return the offset base point
   */
  public OffsetBasePoint getOffsetBasePoint() {
    return offsetBasePoint;
  }

  /**
   * Sets the base point of the offset.
   *
   * @param offsetBasePoint the new offset base point
   */
  public void setOffsetBasePoint(OffsetBasePoint offsetBasePoint) {
    this.offsetBasePoint = offsetBasePoint;
  }

  /**
   * Gets the offset.
   *
   * @return the offset
   */
  public int getOffset() {
    return offset;
  }

  /**
   * Sets the offset.
   *
   * @param offset the new offset
   */
  public void setOffset(int offset) {
    if (offset >= 0) {
      this.offset = offset;
    } else {
      throw new IllegalArgumentException("The offset must be greater than 0.");
    }
  }

}