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xieyinlu
2024-11-30 19:03:49 +08:00
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java/org/apache/naming/factory/BeanFactory.java Normal file
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.naming.factory;
import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Locale;
import java.util.Map;
import javax.naming.Context;
import javax.naming.Name;
import javax.naming.NamingException;
import javax.naming.RefAddr;
import javax.naming.Reference;
import javax.naming.spi.ObjectFactory;
import org.apache.naming.ResourceRef;
/**
* Object factory for any Resource conforming to the JavaBean spec.
*
* <p>This factory can be configured in a <code>&lt;Context&gt;</code> element
* in your <code>conf/server.xml</code>
* configuration file. An example of factory configuration is:</p>
* <pre>
* &lt;Resource name="jdbc/myDataSource" auth="SERVLET"
* type="oracle.jdbc.pool.OracleConnectionCacheImpl"/&gt;
* &lt;ResourceParams name="jdbc/myDataSource"&gt;
* &lt;parameter&gt;
* &lt;name&gt;factory&lt;/name&gt;
* &lt;value&gt;org.apache.naming.factory.BeanFactory&lt;/value&gt;
* &lt;/parameter&gt;
* &lt;parameter&gt;
* &lt;name&gt;driverType&lt;/name&gt;
* &lt;value&gt;thin&lt;/value&gt;
* &lt;/parameter&gt;
* &lt;parameter&gt;
* &lt;name&gt;serverName&lt;/name&gt;
* &lt;value&gt;hue&lt;/value&gt;
* &lt;/parameter&gt;
* &lt;parameter&gt;
* &lt;name&gt;networkProtocol&lt;/name&gt;
* &lt;value&gt;tcp&lt;/value&gt;
* &lt;/parameter&gt;
* &lt;parameter&gt;
* &lt;name&gt;databaseName&lt;/name&gt;
* &lt;value&gt;XXXX&lt;/value&gt;
* &lt;/parameter&gt;
* &lt;parameter&gt;
* &lt;name&gt;portNumber&lt;/name&gt;
* &lt;value&gt;NNNN&lt;/value&gt;
* &lt;/parameter&gt;
* &lt;parameter&gt;
* &lt;name&gt;user&lt;/name&gt;
* &lt;value&gt;XXXX&lt;/value&gt;
* &lt;/parameter&gt;
* &lt;parameter&gt;
* &lt;name&gt;password&lt;/name&gt;
* &lt;value&gt;XXXX&lt;/value&gt;
* &lt;/parameter&gt;
* &lt;parameter&gt;
* &lt;name&gt;maxLimit&lt;/name&gt;
* &lt;value&gt;5&lt;/value&gt;
* &lt;/parameter&gt;
* &lt;/ResourceParams&gt;
* </pre>
*
* @author Aner Perez [aner at ncstech.com]
*/
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
*/
@Override
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.getConstructor().newInstance();
/* Look for properties with explicitly configured setter */
RefAddr ra = ref.get("forceString");
Map<String, Method> forced = new HashMap<>();
String value;
if (ra != null) {
value = (String)ra.getContent();
Class<?> paramTypes[] = new Class[1];
paramTypes[0] = String.class;
String setterName;
int index;
/* Items are given as comma separated list */
for (String param: value.split(",")) {
param = param.trim();
/* A single item can either be of the form name=method
* or just a property name (and we will use a standard
* setter) */
index = param.indexOf('=');
if (index >= 0) {
setterName = param.substring(index + 1).trim();
param = param.substring(0, index).trim();
} else {
setterName = "set" +
param.substring(0, 1).toUpperCase(Locale.ENGLISH) +
param.substring(1);
}
try {
forced.put(param,
beanClass.getMethod(setterName, paramTypes));
} catch (NoSuchMethodException|SecurityException ex) {
throw new NamingException
("Forced String setter " + setterName +
" not found for property " + param);
}
}
}
Enumeration<RefAddr> e = ref.getAll();
while (e.hasMoreElements()) {
ra = e.nextElement();
String propName = ra.getType();
if (propName.equals(Constants.FACTORY) ||
propName.equals("scope") || propName.equals("auth") ||
propName.equals("forceString") ||
propName.equals("singleton")) {
continue;
}
value = (String)ra.getContent();
Object[] valueArray = new Object[1];
/* Shortcut for properties with explicitly configured setter */
Method method = forced.get(propName);
if (method != null) {
valueArray[0] = value;
try {
method.invoke(bean, valueArray);
} catch (IllegalAccessException|
IllegalArgumentException|
InvocationTargetException ex) {
throw new NamingException
("Forced String setter " + method.getName() +
" threw exception for property " + propName);
}
continue;
}
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] =
Character.valueOf(value.charAt(0));
} else if (propType.equals(Byte.class)
|| propType.equals(byte.class)) {
valueArray[0] = Byte.valueOf(value);
} else if (propType.equals(Short.class)
|| propType.equals(short.class)) {
valueArray[0] = Short.valueOf(value);
} else if (propType.equals(Integer.class)
|| propType.equals(int.class)) {
valueArray[0] = Integer.valueOf(value);
} else if (propType.equals(Long.class)
|| propType.equals(long.class)) {
valueArray[0] = Long.valueOf(value);
} else if (propType.equals(Float.class)
|| propType.equals(float.class)) {
valueArray[0] = Float.valueOf(value);
} else if (propType.equals(Double.class)
|| propType.equals(double.class)) {
valueArray[0] = Double.valueOf(value);
} else if (propType.equals(Boolean.class)
|| propType.equals(boolean.class)) {
valueArray[0] = Boolean.valueOf(value);
} else {
throw new NamingException
("String conversion for property " + propName +
" of 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) {
NamingException ne = new NamingException(ie.getMessage());
ne.setRootCause(ie);
throw ne;
} catch (java.lang.ReflectiveOperationException e) {
Throwable cause = e.getCause();
if (cause instanceof ThreadDeath) {
throw (ThreadDeath) cause;
}
if (cause instanceof VirtualMachineError) {
throw (VirtualMachineError) cause;
}
NamingException ne = new NamingException(e.getMessage());
ne.setRootCause(e);
throw ne;
}
} else {
return null;
}
}
}