/*
* 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
.
Version: $Id$
/**
* <p>Minimal implementation of the <code>DynaBean</code> interface. Can be
* used as a convenience base class for more sophisticated implementations.</p>
*
* <p><strong>IMPLEMENTATION NOTE</strong> - Instances of this class that are
* accessed from multiple threads simultaneously need to be synchronized.</p>
*
* <p><strong>IMPLEMENTATION NOTE</strong> - Instances of this class can be
* successfully serialized and deserialized <strong>ONLY</strong> if all
* property values are <code>Serializable</code>.</p>
*
* @version $Id$
*/
public class BasicDynaBean implements DynaBean, Serializable {
// ---------------------------------------------------------- Constructors
Construct a new DynaBean
associated with the specified
DynaClass
instance.
Params: - dynaClass – The DynaClass we are associated with
/**
* Construct a new <code>DynaBean</code> associated with the specified
* <code>DynaClass</code> instance.
*
* @param dynaClass The DynaClass we are associated with
*/
public BasicDynaBean(final DynaClass dynaClass) {
super();
this.dynaClass = dynaClass;
}
// ---------------------------------------------------- Instance Variables
The DynaClass
"base class" that this DynaBean
is associated with.
/**
* The <code>DynaClass</code> "base class" that this DynaBean
* is associated with.
*/
protected DynaClass dynaClass = null;
The set of property values for this DynaBean, keyed by property name.
/**
* The set of property values for this DynaBean, keyed by property name.
*/
protected HashMap<String, Object> values = new HashMap<String, Object>();
Map decorator for this DynaBean /** Map decorator for this DynaBean */
private transient Map<String, Object> 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
:
${myDynaBean.map.fooProperty}
Returns: a Map representation of this DynaBean Since: 1.8.0
/**
* Return a Map representation of this DynaBean.
* </p>
* This, for example, could be used in JSTL in the following way to access
* a DynaBean's <code>fooProperty</code>:
* <ul><li><code>${myDynaBean.<b>map</b>.fooProperty}</code></li></ul>
*
* @return a Map representation of this DynaBean
* @since 1.8.0
*/
public Map<String, Object> getMap() {
// cache the Map
if (mapDecorator == null) {
mapDecorator = new DynaBeanPropertyMapDecorator(this);
}
return mapDecorator;
}
// ------------------------------------------------------ DynaBean Methods
Does the specified mapped property contain a value for the specified
key value?
Params: - name – Name of the property to check
- key – Name of the key to check
Throws: - IllegalArgumentException – if there is no property
of the specified name
Returns: true
if the mapped property contains a value for
the specified key, otherwise false
/**
* 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 <code>true</code> if the mapped property contains a value for
* the specified key, otherwise <code>false</code>
*
* @throws IllegalArgumentException if there is no property
* of the specified name
*/
public boolean contains(final String name, final String key) {
final 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.
Params: - name – Name of the property whose value is to be retrieved
Throws: - IllegalArgumentException – if there is no property
of the specified name
Returns: The property's value
/**
* 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
*
* @throws IllegalArgumentException if there is no property
* of the specified name
*/
public Object get(final String name) {
// Return any non-null value for the specified property
final Object value = values.get(name);
if (value != null) {
return (value);
}
// Return a null value for a non-primitive property
final 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.
Params: - name – Name of the property whose value is to be retrieved
- index – Index of the value to be retrieved
Throws: - IllegalArgumentException – if there is no property
of the specified name
- IllegalArgumentException – if the specified property
exists, but is not indexed
- IndexOutOfBoundsException – if the specified index
is outside the range of the underlying property
- NullPointerException – if no array or List has been
initialized for this property
Returns: The indexed property's value
/**
* 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
*
* @throws IllegalArgumentException if there is no property
* of the specified name
* @throws IllegalArgumentException if the specified property
* exists, but is not indexed
* @throws IndexOutOfBoundsException if the specified index
* is outside the range of the underlying property
* @throws NullPointerException if no array or List has been
* initialized for this property
*/
public Object get(final String name, final int index) {
final 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.
Params: - name – Name of the property whose value is to be retrieved
- key – Key of the value to be retrieved
Throws: - IllegalArgumentException – if there is no property
of the specified name
- IllegalArgumentException – if the specified property
exists, but is not mapped
Returns: The mapped property's value
/**
* Return the value of a mapped property with the specified name,
* or <code>null</code> 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
*
* @throws IllegalArgumentException if there is no property
* of the specified name
* @throws IllegalArgumentException if the specified property
* exists, but is not mapped
*/
public Object get(final String name, final String key) {
final 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.
Returns: The associated DynaClass
/**
* Return the <code>DynaClass</code> 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.
Params: - name – Name of the property for which a value is to
be removed
- key – Key of the value to be removed
Throws: - IllegalArgumentException – if there is no property
of the specified name
/**
* 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
*
* @throws IllegalArgumentException if there is no property
* of the specified name
*/
public void remove(final String name, final String key) {
final 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.
Params: - name – Name of the property whose value is to be set
- value – Value to which this property is to be set
Throws: - ConversionException – if the specified value cannot be
converted to the type required for this property
- IllegalArgumentException – if there is no property
of the specified name
- NullPointerException – if an attempt is made to set a
primitive property to null
/**
* 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
*
* @throws ConversionException if the specified value cannot be
* converted to the type required for this property
* @throws IllegalArgumentException if there is no property
* of the specified name
* @throws NullPointerException if an attempt is made to set a
* primitive property to null
*/
public void set(final String name, final Object value) {
final 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.
Params: - name – Name of the property whose value is to be set
- index – Index of the property to be set
- value – Value to which this property is to be set
Throws: - ConversionException – if the specified value cannot be
converted to the type required for this property
- IllegalArgumentException – if there is no property
of the specified name
- IllegalArgumentException – if the specified property
exists, but is not indexed
- IndexOutOfBoundsException – if the specified index
is outside the range of the underlying property
/**
* 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
*
* @throws ConversionException if the specified value cannot be
* converted to the type required for this property
* @throws IllegalArgumentException if there is no property
* of the specified name
* @throws IllegalArgumentException if the specified property
* exists, but is not indexed
* @throws IndexOutOfBoundsException if the specified index
* is outside the range of the underlying property
*/
public void set(final String name, final int index, final Object value) {
final 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 {
@SuppressWarnings("unchecked")
final
// This is safe to cast because list properties are always
// of type Object
List<Object> list = (List<Object>) prop;
list.set(index, value);
} catch (final 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.
Params: - name – Name of the property whose value is to be set
- key – Key of the property to be set
- value – Value to which this property is to be set
Throws: - ConversionException – if the specified value cannot be
converted to the type required for this property
- IllegalArgumentException – if there is no property
of the specified name
- IllegalArgumentException – if the specified property
exists, but is not mapped
/**
* 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
*
* @throws ConversionException if the specified value cannot be
* converted to the type required for this property
* @throws IllegalArgumentException if there is no property
* of the specified name
* @throws IllegalArgumentException if the specified property
* exists, but is not mapped
*/
public void set(final String name, final String key, final Object value) {
final Object prop = values.get(name);
if (prop == null) {
throw new NullPointerException
("No mapped value for '" + name + "(" + key + ")'");
} else if (prop instanceof Map) {
@SuppressWarnings("unchecked")
final
// This is safe to cast because mapped properties are always
// maps of types String -> Object
Map<String, Object> map = (Map<String, Object>) prop;
map.put(key, value);
} else {
throw new IllegalArgumentException
("Non-mapped property for '" + name + "(" + key + ")'");
}
}
// ------------------------------------------------------ Protected Methods
Return the property descriptor for the specified property name.
Params: - name – Name of the property for which to retrieve the descriptor
Throws: - IllegalArgumentException – if this is not a valid property
name for our DynaClass
Returns: The property descriptor
/**
* 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
*
* @throws IllegalArgumentException if this is not a valid property
* name for our DynaClass
*/
protected DynaProperty getDynaProperty(final String name) {
final 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?
Params: - dest – Destination class
- source – Source class
Returns: true
if the source class is assignable to the
destination class, otherwise false
/**
* Is an object of the source class assignable to the destination class?
*
* @param dest Destination class
* @param source Source class
* @return <code>true</code> if the source class is assignable to the
* destination class, otherwise <code>false</code>
*/
protected boolean isAssignable(final Class<?> dest, final 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);
}
}
}