/*
* 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.commons.beanutils;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
Minimal implementation of the DynaClass
interface. Can be
used as a convenience base class for more sophisticated implementations.
*
IMPLEMENTATION NOTE - The DynaBean
implementation class supplied to our constructor MUST have a one-argument
constructor of its own that accepts a DynaClass
. This is
used to associate the DynaBean instance with this DynaClass.
Version: $Id$
/**
* <p>Minimal implementation of the <code>DynaClass</code> interface. Can be
* used as a convenience base class for more sophisticated implementations.</p> *
* <p><strong>IMPLEMENTATION NOTE</strong> - The <code>DynaBean</code>
* implementation class supplied to our constructor MUST have a one-argument
* constructor of its own that accepts a <code>DynaClass</code>. This is
* used to associate the DynaBean instance with this DynaClass.</p>
*
* @version $Id$
*/
public class BasicDynaClass implements DynaClass, Serializable {
// ----------------------------------------------------------- Constructors
Construct a new BasicDynaClass with default parameters.
/**
* Construct a new BasicDynaClass with default parameters.
*/
public BasicDynaClass() {
this(null, null, null);
}
Construct a new BasicDynaClass with the specified parameters.
Params: - name – Name of this DynaBean class
- dynaBeanClass – The implementation class for new instances
/**
* Construct a new BasicDynaClass with the specified parameters.
*
* @param name Name of this DynaBean class
* @param dynaBeanClass The implementation class for new instances
*/
public BasicDynaClass(final String name, final Class<?> dynaBeanClass) {
this(name, dynaBeanClass, null);
}
Construct a new BasicDynaClass with the specified parameters.
Params: - name – Name of this DynaBean class
- dynaBeanClass – The implementation class for new intances
- properties – Property descriptors for the supported properties
/**
* Construct a new BasicDynaClass with the specified parameters.
*
* @param name Name of this DynaBean class
* @param dynaBeanClass The implementation class for new intances
* @param properties Property descriptors for the supported properties
*/
public BasicDynaClass(final String name, Class<?> dynaBeanClass,
final DynaProperty[] properties) {
super();
if (name != null) {
this.name = name;
}
if (dynaBeanClass == null) {
dynaBeanClass = BasicDynaBean.class;
}
setDynaBeanClass(dynaBeanClass);
if (properties != null) {
setProperties(properties);
}
}
// ----------------------------------------------------- Instance Variables
The constructor of the dynaBeanClass
that we will use
for creating new instances.
/**
* The constructor of the <code>dynaBeanClass</code> that we will use
* for creating new instances.
*/
protected transient Constructor<?> constructor = null;
The method signature of the constructor we will use to create
new DynaBean instances.
/**
* The method signature of the constructor we will use to create
* new DynaBean instances.
*/
protected static Class<?>[] constructorTypes = { DynaClass.class };
The argument values to be passed to the constructore we will use
to create new DynaBean instances.
/**
* The argument values to be passed to the constructore we will use
* to create new DynaBean instances.
*/
protected Object[] constructorValues = { this };
The DynaBean
implementation class we will use for
creating new instances.
/**
* The <code>DynaBean</code> implementation class we will use for
* creating new instances.
*/
protected Class<?> dynaBeanClass = BasicDynaBean.class;
The "name" of this DynaBean class.
/**
* The "name" of this DynaBean class.
*/
protected String name = this.getClass().getName();
The set of dynamic properties that are part of this DynaClass.
/**
* The set of dynamic properties that are part of this DynaClass.
*/
protected DynaProperty[] properties = new DynaProperty[0];
The set of dynamic properties that are part of this DynaClass,
keyed by the property name. Individual descriptor instances will
be the same instances as those in the properties
list.
/**
* The set of dynamic properties that are part of this DynaClass,
* keyed by the property name. Individual descriptor instances will
* be the same instances as those in the <code>properties</code> list.
*/
protected HashMap<String, DynaProperty> propertiesMap = new HashMap<String, DynaProperty>();
// ------------------------------------------------------ DynaClass Methods
Return the name of this DynaClass (analogous to the
getName()
method of java.lang.ClassDynaClass
implementation class to support
different dynamic classes, with different sets of properties.
Returns: the name of the DynaClass
/**
* Return the name of this DynaClass (analogous to the
* <code>getName()</code> method of <code>java.lang.Class</code), which
* allows the same <code>DynaClass</code> implementation class to support
* different dynamic classes, with different sets of properties.
*
* @return the name of the DynaClass
*/
public String getName() {
return (this.name);
}
Return a property descriptor for the specified property, if it exists;
otherwise, return null
.
Params: - name – Name of the dynamic property for which a descriptor
is requested
Throws: - IllegalArgumentException – if no property name is specified
Returns: The descriptor for the specified property
/**
* Return a property descriptor for the specified property, if it exists;
* otherwise, return <code>null</code>.
*
* @param name Name of the dynamic property for which a descriptor
* is requested
* @return The descriptor for the specified property
*
* @throws IllegalArgumentException if no property name is specified
*/
public DynaProperty getDynaProperty(final String name) {
if (name == null) {
throw new IllegalArgumentException
("No property name specified");
}
return propertiesMap.get(name);
}
Return an array of ProperyDescriptors
for the properties
currently defined in this DynaClass. If no properties are defined, a
zero-length array will be returned.
FIXME - Should we really be implementing
getBeanInfo()
instead, which returns property descriptors
and a bunch of other stuff?
Returns: the set of properties for this DynaClass
/**
* <p>Return an array of <code>ProperyDescriptors</code> for the properties
* currently defined in this DynaClass. If no properties are defined, a
* zero-length array will be returned.</p>
*
* <p><strong>FIXME</strong> - Should we really be implementing
* <code>getBeanInfo()</code> instead, which returns property descriptors
* and a bunch of other stuff?</p>
*
* @return the set of properties for this DynaClass
*/
public DynaProperty[] getDynaProperties() {
return (properties);
}
Instantiate and return a new DynaBean instance, associated
with this DynaClass.
Throws: - IllegalAccessException – if the Class or the appropriate
constructor is not accessible
- InstantiationException – if this Class represents an abstract
class, an array class, a primitive type, or void; or if instantiation
fails for some other reason
Returns: A new DynaBean
instance
/**
* Instantiate and return a new DynaBean instance, associated
* with this DynaClass.
*
* @return A new <code>DynaBean</code> instance
* @throws IllegalAccessException if the Class or the appropriate
* constructor is not accessible
* @throws InstantiationException if this Class represents an abstract
* class, an array class, a primitive type, or void; or if instantiation
* fails for some other reason
*/
public DynaBean newInstance()
throws IllegalAccessException, InstantiationException {
try {
// Refind the constructor after a deserialization (if needed)
if (constructor == null) {
setDynaBeanClass(this.dynaBeanClass);
}
// Invoke the constructor to create a new bean instance
return ((DynaBean) constructor.newInstance(constructorValues));
} catch (final InvocationTargetException e) {
throw new InstantiationException
(e.getTargetException().getMessage());
}
}
// --------------------------------------------------------- Public Methods
Return the Class object we will use to create new instances in the
newInstance()
method. This Class MUST
implement the DynaBean
interface.
Returns: The class of the DynaBean
/**
* Return the Class object we will use to create new instances in the
* <code>newInstance()</code> method. This Class <strong>MUST</strong>
* implement the <code>DynaBean</code> interface.
*
* @return The class of the {@link DynaBean}
*/
public Class<?> getDynaBeanClass() {
return (this.dynaBeanClass);
}
// ------------------------------------------------------ Protected Methods
Set the Class object we will use to create new instances in the
newInstance()
method. This Class MUST
implement the DynaBean
interface.
Params: - dynaBeanClass – The new Class object
Throws: - IllegalArgumentException – if the specified Class does not
implement the
DynaBean
interface
/**
* Set the Class object we will use to create new instances in the
* <code>newInstance()</code> method. This Class <strong>MUST</strong>
* implement the <code>DynaBean</code> interface.
*
* @param dynaBeanClass The new Class object
*
* @throws IllegalArgumentException if the specified Class does not
* implement the <code>DynaBean</code> interface
*/
protected void setDynaBeanClass(final Class<?> dynaBeanClass) {
// Validate the argument type specified
if (dynaBeanClass.isInterface()) {
throw new IllegalArgumentException
("Class " + dynaBeanClass.getName() +
" is an interface, not a class");
}
if (!DynaBean.class.isAssignableFrom(dynaBeanClass)) {
throw new IllegalArgumentException
("Class " + dynaBeanClass.getName() +
" does not implement DynaBean");
}
// Identify the Constructor we will use in newInstance()
try {
this.constructor = dynaBeanClass.getConstructor(constructorTypes);
} catch (final NoSuchMethodException e) {
throw new IllegalArgumentException
("Class " + dynaBeanClass.getName() +
" does not have an appropriate constructor");
}
this.dynaBeanClass = dynaBeanClass;
}
Set the list of dynamic properties supported by this DynaClass.
Params: - properties – List of dynamic properties to be supported
/**
* Set the list of dynamic properties supported by this DynaClass.
*
* @param properties List of dynamic properties to be supported
*/
protected void setProperties(final DynaProperty[] properties) {
this.properties = properties;
propertiesMap.clear();
for (DynaProperty propertie : properties) {
propertiesMap.put(propertie.getName(), propertie);
}
}
}