remm 01/09/01 18:17:47
Added: catalina/src/share/org/apache/naming/factory
BeanFactory.java
Log:
- Add new resource factory for resource objects conforming to the JavaBean
component model. This resource factory is fully generic.
- More specifically the class of the resource to be instanciated must :
- have a public default constructor
- have all its important properties be of simple types
- See the (very straightforward) example in the Javadoc for more details.
- Thanks to Aner Perez <aner at ncstech.com> for contributing this code.
Revision Changes Path
1.1
jakarta-tomcat-4.0/catalina/src/share/org/apache/naming/factory/BeanFactory.java
Index: BeanFactory.java
===================================================================
/*
* $Header:
/home/cvs/jakarta-tomcat-4.0/catalina/src/share/org/apache/naming/factory/BeanFactory.java,v
1.1 2001/09/02 01:17:47 remm Exp $
* $Revision: 1.1 $
* $Date: 2001/09/02 01:17:47 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2001 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 acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* 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/>.
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.naming.factory;
import java.util.Hashtable;
import java.util.Enumeration;
import javax.naming.Name;
import javax.naming.Context;
import javax.naming.NamingException;
import javax.naming.Reference;
import javax.naming.RefAddr;
import javax.naming.spi.ObjectFactory;
import org.apache.naming.ResourceRef;
import java.beans.Introspector;
import java.beans.BeanInfo;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
/**
* Object factory for any Resource conforming to the JavaBean spec.
*
* <p>This factory can be configured in a <code><DefaultContext></code>
* or <code><Context></code> element in your <code>conf/server.xml</code>
* configuration file. An example of factory configuration is:</p>
* <pre>
* <Resource name="jdbc/myDataSource" auth="SERVLET"
* type="oracle.jdbc.pool.OracleConnectionCacheImpl"/>
* <ResourceParams name="jdbc/myDataSource">
* <parameter>
* <name>factory</name>
* <value>org.apache.naming.factory.BeanFactory</value>
* </parameter>
* <parameter>
* <name>driverType</name>
* <value>thin</value>
* </parameter>
* <parameter>
* <name>serverName</name>
* <value>hue</value>
* </parameter>
* <parameter>
* <name>networkProtocol</name>
* <value>tcp</value>
* </parameter>
* <parameter>
* <name>databaseName</name>
* <value>XXXX</value>
* </parameter>
* <parameter>
* <name>portNumber</name>
* <value>NNNN</value>
* </parameter>
* <parameter>
* <name>user</name>
* <value>XXXX</value>
* </parameter>
* <parameter>
* <name>password</name>
* <value>XXXX</value>
* </parameter>
* <parameter>
* <name>maxLimit</name>
* <value>5</value>
* </parameter>
* </ResourceParams>
* </pre>
*
* @author <a href="mailto:aner at ncstech.com">Aner Perez</a>
*/
public class BeanFactory
implements ObjectFactory {
// ----------------------------------------------------------- Constructors
// -------------------------------------------------------------- Constants
// ----------------------------------------------------- Instance Variables
// --------------------------------------------------------- Public Methods
// -------------------------------------------------- ObjectFactory Methods
/**
* Create a new Bean instance.
*
* @param obj The reference object describing the Bean
*/
public Object getObjectInstance(Object obj, Name name, Context nameCtx,
Hashtable environment)
throws NamingException {
if (obj instanceof ResourceRef) {
try {
Reference ref = (Reference) obj;
String beanClassName = ref.getClassName();
Class beanClass = null;
ClassLoader tcl =
Thread.currentThread().getContextClassLoader();
if (tcl != null) {
try {
beanClass = tcl.loadClass(beanClassName);
} catch(ClassNotFoundException e) {
}
} else {
try {
beanClass = Class.forName(beanClassName);
} catch(ClassNotFoundException e) {
e.printStackTrace();
}
}
if (beanClass == null) {
throw new NamingException
("Class not found: " + beanClassName);
}
BeanInfo bi = Introspector.getBeanInfo(beanClass);
PropertyDescriptor[] pda = bi.getPropertyDescriptors();
Object bean = beanClass.newInstance();
Enumeration e = ref.getAll();
while (e.hasMoreElements()) {
RefAddr ra = (RefAddr) e.nextElement();
String propName = ra.getType();
if (propName.equals(Constants.FACTORY) ||
propName.equals("scope") || propName.equals("auth")) {
continue;
}
String value = (String)ra.getContent();
Object[] valueArray = new Object[1];
int i = 0;
for (i = 0; i<pda.length; i++) {
if (pda[i].getName().equals(propName)) {
Class propType = pda[i].getPropertyType();
if (propType.equals(String.class)) {
valueArray[0] = value;
} else if (propType.equals(Character.class)
|| propType.equals(char.class)) {
valueArray[0] = new Character(value.charAt(0));
} else if (propType.equals(Byte.class)
|| propType.equals(byte.class)) {
valueArray[0] = new Byte(value);
} else if (propType.equals(Short.class)
|| propType.equals(short.class)) {
valueArray[0] = new Short(value);
} else if (propType.equals(Integer.class)
|| propType.equals(int.class)) {
valueArray[0] = new Integer(value);
} else if (propType.equals(Long.class)
|| propType.equals(long.class)) {
valueArray[0] = new Long(value);
} else if (propType.equals(Float.class)
|| propType.equals(float.class)) {
valueArray[0] = new Float(value);
} else if (propType.equals(Double.class)
|| propType.equals(double.class)) {
valueArray[0] = new Double(value);
} else {
throw new NamingException
("String conversion for property type '"
+ propType.getName() + "' not available");
}
Method setProp = pda[i].getWriteMethod();
if (setProp != null) {
setProp.invoke(bean, valueArray);
} else {
throw new NamingException
("Write not allowed for property: "
+ propName);
}
break;
}
}
if (i == pda.length) {
throw new NamingException
("No set method found for property: " + propName);
}
}
return bean;
} catch (java.beans.IntrospectionException ie) {
throw new NamingException(ie.getMessage());
} catch (java.lang.IllegalAccessException iae) {
throw new NamingException(iae.getMessage());
} catch (java.lang.InstantiationException ie2) {
throw new NamingException(ie2.getMessage());
} catch (java.lang.reflect.InvocationTargetException ite) {
throw new NamingException(ite.getMessage());
}
} else {
return null;
}
}
}
