// Copyright 2004 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry.vlib.components;
import java.sql.Timestamp;
import org.apache.tapestry.BaseComponent;
import org.apache.tapestry.IEngine;
import org.apache.tapestry.vlib.Visit;
import org.apache.tapestry.vlib.ejb.Book;
/**
* Creates a link to the {@link org.apache.tapestry.vlib.pages.ViewBook}
* page using the external service.
*
*
* <table border=1>
* <tr> <th>Parameter</th>
* <th>Type</th>
* <th>Direction</th>
* <th>Required</th>
* <th>Default</th>
* <th>Description</th>
* </tr>
*
* <tr>
* <td>book</td>
* <td>{@link Book}</td>
* <td>in</td>
* <td>yes</td>
* <td> </td>
* <td>The {@link Book} to create a link to.</td>
* </tr>
*
* </table>
*
* <p>Informal parameters are allowed.
*
* @author Howard Lewis Ship
* @version $Id: BookLink.java,v 1.4 2004/02/19 17:38:04 hlship Exp $
*
**/
public abstract class BookLink extends BaseComponent
{
/**
* One week, in milliseconds (1/1000 second). Books that have been added in the last
* week are marked new, until the user logs in, at which point, its books
* added since the user last logged in.
*
**/
private static final long ONE_WEEK_MILLIS = 1000l * 60l * 60l * 24l * 7l;
public boolean isNewlyAdded()
{
IEngine engine = getPage().getEngine();
Visit visit = (Visit) engine.getVisit();
Timestamp lastAccess = null;
if (visit != null)
lastAccess = visit.getLastAccess();
Book book = getBook();
Timestamp dateAdded = book.getDateAdded();
// Some old records may not contain a value for dateAdded
if (dateAdded == null)
return false;
// If don't know the last access time (because the user
// hasn't logged in yet), then show anything newer
// than a week.
if (lastAccess == null)
{
long now = System.currentTimeMillis();
return (now - dateAdded.getTime()) <= ONE_WEEK_MILLIS;
}
// Return true if lastAccess is earlier than date added.
return lastAccess.compareTo(dateAdded) <= 0;
}
public abstract Book getBook();
}