/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation", "Tapestry"
* must not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* or "Tapestry", nor may "Apache" or "Tapestry" appear in their
* name, without prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE TAPESTRY CONTRIBUTOR COMMUNITY
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.tapestry.vlib.pages;
import java.rmi.RemoteException;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.html.BasePage;
import org.apache.tapestry.vlib.IMessageProperty;
import org.apache.tapestry.vlib.VirtualLibraryEngine;
import org.apache.tapestry.vlib.components.Browser;
import org.apache.tapestry.vlib.ejb.IBookQuery;
import org.apache.tapestry.vlib.ejb.MasterQueryParameters;
import org.apache.tapestry.vlib.ejb.SortColumn;
import org.apache.tapestry.vlib.ejb.SortOrdering;
/**
* Runs queries and displays matches.
*
* @author Howard Lewis Ship
* @version $Id: BookMatches.java,v 1.9 2003/05/28 13:41:42 hlship Exp $
**/
public abstract class BookMatches extends BasePage
{
private Browser _browser;
public void finishLoad()
{
_browser = (Browser) getComponent("browser");
}
public abstract IBookQuery getBookQuery();
public abstract void setBookQuery(IBookQuery bookQuery);
public abstract SortColumn getSortColumn();
public abstract boolean isDescending();
public abstract MasterQueryParameters getQueryParameters();
public abstract void setQueryParameters(MasterQueryParameters queryParameters);
/**
* Invoked by the {@link Home} page to perform a query.
*
**/
public void performQuery(MasterQueryParameters parameters, IRequestCycle cycle)
{
setQueryParameters(parameters);
int count = executeQuery();
if (count == 0)
{
IMessageProperty page = (IMessageProperty) cycle.getPage();
page.setMessage(getMessage("no-matches"));
return;
}
_browser.initializeForResultCount(count);
cycle.activate(this);
}
public void requery(IRequestCycle cycle)
{
int count = executeQuery();
if (count != _browser.getResultCount())
_browser.initializeForResultCount(count);
}
private int executeQuery()
{
VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
MasterQueryParameters parameters = getQueryParameters();
SortOrdering ordering = new SortOrdering(getSortColumn(), isDescending());
int i = 0;
while (true)
{
try
{
IBookQuery query = getBookQuery();
if (query == null)
{
query = vengine.createNewQuery();
setBookQuery(query);
}
return query.masterQuery(parameters, ordering);
}
catch (RemoteException ex)
{
vengine.rmiFailure("Remote exception processing query.", ex, i++);
setBookQuery(null);
}
}
}
}