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BeanUtils provides an easy-to-use but flexible wrapper around reflection and introspection.
/*
* 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.Array;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Minimal implementation of the DynaBean interface. Can be
* used as a convenience base class for more sophisticated implementations.
*
* IMPLEMENTATION NOTE - Instances of this class that are
* accessed from multiple threads simultaneously need to be synchronized.
*
* IMPLEMENTATION NOTE - Instances of this class can be
* successfully serialized and deserialized ONLY if all
* property values are Serializable.
*
* @author Craig McClanahan
* @version $Revision: 926529 $ $Date: 2010-03-23 07:44:24 -0400 (Tue, 23 Mar 2010) $
*/
public class BasicDynaBean implements DynaBean, Serializable {
// ---------------------------------------------------------- Constructors
/**
* Construct a new DynaBean associated with the specified
* DynaClass instance.
*
* @param dynaClass The DynaClass we are associated with
*/
public BasicDynaBean(DynaClass dynaClass) {
super();
this.dynaClass = dynaClass;
}
// ---------------------------------------------------- Instance Variables
/**
* The DynaClass "base class" that this DynaBean
* is associated with.
*/
protected DynaClass dynaClass = null;
/**
* The set of property values for this DynaBean, keyed by property name.
*/
protected HashMap values = new HashMap();
/** Map decorator for this DynaBean */
private transient Map mapDecorator;
/**
* Return a Map representation of this DynaBean.
*
* This, for example, could be used in JSTL in the following way to access
* a DynaBean's fooProperty:
* ${myDynaBean.map.fooProperty}
*
* @return a Map representation of this DynaBean
* @since 1.8.0
*/
public Map getMap() {
// cache the Map
if (mapDecorator == null) {
mapDecorator = new DynaBeanMapDecorator(this);
}
return mapDecorator;
}
// ------------------------------------------------------ DynaBean Methods
/**
* Does the specified mapped property contain a value for the specified
* key value?
*
* @param name Name of the property to check
* @param key Name of the key to check
* @return true if the mapped property contains a value for
* the specified key, otherwise false
*
* @exception IllegalArgumentException if there is no property
* of the specified name
*/
public boolean contains(String name, String key) {
Object value = values.get(name);
if (value == null) {
throw new NullPointerException
("No mapped value for '" + name + "(" + key + ")'");
} else if (value instanceof Map) {
return (((Map) value).containsKey(key));
} else {
throw new IllegalArgumentException
("Non-mapped property for '" + name + "(" + key + ")'");
}
}
/**
* Return the value of a simple property with the specified name.
*
* @param name Name of the property whose value is to be retrieved
* @return The property's value
*
* @exception IllegalArgumentException if there is no property
* of the specified name
*/
public Object get(String name) {
// Return any non-null value for the specified property
Object value = values.get(name);
if (value != null) {
return (value);
}
// Return a null value for a non-primitive property
Class type = getDynaProperty(name).getType();
if (!type.isPrimitive()) {
return (value);
}
// Manufacture default values for primitive properties
if (type == Boolean.TYPE) {
return (Boolean.FALSE);
} else if (type == Byte.TYPE) {
return (new Byte((byte) 0));
} else if (type == Character.TYPE) {
return (new Character((char) 0));
} else if (type == Double.TYPE) {
return (new Double(0.0));
} else if (type == Float.TYPE) {
return (new Float((float) 0.0));
} else if (type == Integer.TYPE) {
return (new Integer(0));
} else if (type == Long.TYPE) {
return (new Long(0));
} else if (type == Short.TYPE) {
return (new Short((short) 0));
} else {
return (null);
}
}
/**
* Return the value of an indexed property with the specified name.
*
* @param name Name of the property whose value is to be retrieved
* @param index Index of the value to be retrieved
* @return The indexed property's value
*
* @exception IllegalArgumentException if there is no property
* of the specified name
* @exception IllegalArgumentException if the specified property
* exists, but is not indexed
* @exception IndexOutOfBoundsException if the specified index
* is outside the range of the underlying property
* @exception NullPointerException if no array or List has been
* initialized for this property
*/
public Object get(String name, int index) {
Object value = values.get(name);
if (value == null) {
throw new NullPointerException
("No indexed value for '" + name + "[" + index + "]'");
} else if (value.getClass().isArray()) {
return (Array.get(value, index));
} else if (value instanceof List) {
return ((List) value).get(index);
} else {
throw new IllegalArgumentException
("Non-indexed property for '" + name + "[" + index + "]'");
}
}
/**
* Return the value of a mapped property with the specified name,
* or null if there is no value for the specified key.
*
* @param name Name of the property whose value is to be retrieved
* @param key Key of the value to be retrieved
* @return The mapped property's value
*
* @exception IllegalArgumentException if there is no property
* of the specified name
* @exception IllegalArgumentException if the specified property
* exists, but is not mapped
*/
public Object get(String name, String key) {
Object value = values.get(name);
if (value == null) {
throw new NullPointerException
("No mapped value for '" + name + "(" + key + ")'");
} else if (value instanceof Map) {
return (((Map) value).get(key));
} else {
throw new IllegalArgumentException
("Non-mapped property for '" + name + "(" + key + ")'");
}
}
/**
* Return the DynaClass instance that describes the set of
* properties available for this DynaBean.
*
* @return The associated DynaClass
*/
public DynaClass getDynaClass() {
return (this.dynaClass);
}
/**
* Remove any existing value for the specified key on the
* specified mapped property.
*
* @param name Name of the property for which a value is to
* be removed
* @param key Key of the value to be removed
*
* @exception IllegalArgumentException if there is no property
* of the specified name
*/
public void remove(String name, String key) {
Object value = values.get(name);
if (value == null) {
throw new NullPointerException
("No mapped value for '" + name + "(" + key + ")'");
} else if (value instanceof Map) {
((Map) value).remove(key);
} else {
throw new IllegalArgumentException
("Non-mapped property for '" + name + "(" + key + ")'");
}
}
/**
* Set the value of a simple property with the specified name.
*
* @param name Name of the property whose value is to be set
* @param value Value to which this property is to be set
*
* @exception ConversionException if the specified value cannot be
* converted to the type required for this property
* @exception IllegalArgumentException if there is no property
* of the specified name
* @exception NullPointerException if an attempt is made to set a
* primitive property to null
*/
public void set(String name, Object value) {
DynaProperty descriptor = getDynaProperty(name);
if (value == null) {
if (descriptor.getType().isPrimitive()) {
throw new NullPointerException
("Primitive value for '" + name + "'");
}
} else if (!isAssignable(descriptor.getType(), value.getClass())) {
throw new ConversionException
("Cannot assign value of type '" +
value.getClass().getName() +
"' to property '" + name + "' of type '" +
descriptor.getType().getName() + "'");
}
values.put(name, value);
}
/**
* Set the value of an indexed property with the specified name.
*
* @param name Name of the property whose value is to be set
* @param index Index of the property to be set
* @param value Value to which this property is to be set
*
* @exception ConversionException if the specified value cannot be
* converted to the type required for this property
* @exception IllegalArgumentException if there is no property
* of the specified name
* @exception IllegalArgumentException if the specified property
* exists, but is not indexed
* @exception IndexOutOfBoundsException if the specified index
* is outside the range of the underlying property
*/
public void set(String name, int index, Object value) {
Object prop = values.get(name);
if (prop == null) {
throw new NullPointerException
("No indexed value for '" + name + "[" + index + "]'");
} else if (prop.getClass().isArray()) {
Array.set(prop, index, value);
} else if (prop instanceof List) {
try {
((List) prop).set(index, value);
} catch (ClassCastException e) {
throw new ConversionException(e.getMessage());
}
} else {
throw new IllegalArgumentException
("Non-indexed property for '" + name + "[" + index + "]'");
}
}
/**
* Set the value of a mapped property with the specified name.
*
* @param name Name of the property whose value is to be set
* @param key Key of the property to be set
* @param value Value to which this property is to be set
*
* @exception ConversionException if the specified value cannot be
* converted to the type required for this property
* @exception IllegalArgumentException if there is no property
* of the specified name
* @exception IllegalArgumentException if the specified property
* exists, but is not mapped
*/
public void set(String name, String key, Object value) {
Object prop = values.get(name);
if (prop == null) {
throw new NullPointerException
("No mapped value for '" + name + "(" + key + ")'");
} else if (prop instanceof Map) {
((Map) prop).put(key, value);
} else {
throw new IllegalArgumentException
("Non-mapped property for '" + name + "(" + key + ")'");
}
}
// ------------------------------------------------------ Protected Methods
/**
* Return the property descriptor for the specified property name.
*
* @param name Name of the property for which to retrieve the descriptor
* @return The property descriptor
*
* @exception IllegalArgumentException if this is not a valid property
* name for our DynaClass
*/
protected DynaProperty getDynaProperty(String name) {
DynaProperty descriptor = getDynaClass().getDynaProperty(name);
if (descriptor == null) {
throw new IllegalArgumentException
("Invalid property name '" + name + "'");
}
return (descriptor);
}
/**
* Is an object of the source class assignable to the destination class?
*
* @param dest Destination class
* @param source Source class
* @return true if the source class is assignable to the
* destination class, otherwise false
*/
protected boolean isAssignable(Class dest, Class source) {
if (dest.isAssignableFrom(source) ||
((dest == Boolean.TYPE) && (source == Boolean.class)) ||
((dest == Byte.TYPE) && (source == Byte.class)) ||
((dest == Character.TYPE) && (source == Character.class)) ||
((dest == Double.TYPE) && (source == Double.class)) ||
((dest == Float.TYPE) && (source == Float.class)) ||
((dest == Integer.TYPE) && (source == Integer.class)) ||
((dest == Long.TYPE) && (source == Long.class)) ||
((dest == Short.TYPE) && (source == Short.class))) {
return (true);
} else {
return (false);
}
}
}
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