examples/Vlib/src/net/sf/tapestry/vlib/pages/NewBook.java

/*
 *  ====================================================================
 *  The Apache Software License, Version 1.1
 *
 *  Copyright (c) 2002 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://www.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" and
 *  "Apache 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",
 *  "Apache Tapestry", nor may "Apache" 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 APACHE SOFTWARE FOUNDATION OR
 *  ITS CONTRIBUTORS 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 net.sf.tapestry.vlib.pages;

import java.rmi.RemoteException;
import java.util.HashMap;
import java.util.Map;

import javax.ejb.CreateException;

import net.sf.tapestry.IRequestCycle;
import net.sf.tapestry.Tapestry;
import net.sf.tapestry.vlib.Protected;
import net.sf.tapestry.vlib.VirtualLibraryEngine;
import net.sf.tapestry.vlib.Visit;
import net.sf.tapestry.vlib.ejb.IOperations;

/**
 *  Collects information for a new book.  
 *
 *  @author Howard Lewis Ship
 *  @version $Id$
 * 
 **/

public class NewBook extends Protected
{
    private Map attributes;
    private String publisherName;

    public void detach()
    {
        attributes = null;
        publisherName = null;

        super.detach();
    }

    public Map getAttributes()
    {
        if (attributes == null)
            attributes = new HashMap();

        return attributes;
    }

    public String getPublisherName()
    {
        return publisherName;
    }

    public void setPublisherName(String value)
    {
        publisherName = value;
    }

    public void addBook(IRequestCycle cycle)
    {
        Map attributes = getAttributes();

        Integer publisherPK = (Integer) attributes.get("publisherPK");

        if (publisherPK == null && Tapestry.isNull(publisherName))
        {
            setErrorField(
                "inputPublisherName",
                "Must enter a publisher name or select an existing publisher from the list.",
                null);
            return;
        }

        if (publisherPK != null && !Tapestry.isNull(publisherName))
        {
            setErrorField(
                "inputPublisherName",
                "Must either select an existing publisher or enter a new publisher name.",
                publisherName);
            return;
        }

        if (isInError())
            return;

        Visit visit = (Visit) getVisit();
        Integer userPK = visit.getUserPK();
        VirtualLibraryEngine vengine = visit.getEngine();

        attributes.put("ownerPK", userPK);
        attributes.put("holderPK", userPK);

        for (int i = 0; i < 2; i++)
        {
            try
            {

                IOperations operations = vengine.getOperations();

                if (publisherPK != null)
                    operations.addBook(attributes);
                else
                {
                    operations.addBook(attributes, publisherName);

                    // Clear the app's cache of info; in this case, known publishers.

                    visit.clearCache();
                }

                break;
            }
            catch (CreateException ex)
            {
                setError("Error adding book: " + ex.getMessage());
                return;
            }
            catch (RemoteException ex)
            {
                vengine.rmiFailure("Remote exception adding new book.", ex, i > 0);
            }
        }

        // Success.  First, update the message property of the return page.

        MyLibrary myLibrary = (MyLibrary) cycle.getPage("MyLibrary");

        myLibrary.setMessage("Added: " + attributes.get("title"));

        cycle.setPage(myLibrary);
    }

}