001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018
019package org.apache.commons.beanutils;
020
021
022import java.io.Serializable;
023import java.lang.reflect.Array;
024import java.util.HashMap;
025import java.util.List;
026import java.util.Map;
027
028
029/**
030 * <p>Minimal implementation of the <code>DynaBean</code> interface.  Can be
031 * used as a convenience base class for more sophisticated implementations.</p>
032 *
033 * <p><strong>IMPLEMENTATION NOTE</strong> - Instances of this class that are
034 * accessed from multiple threads simultaneously need to be synchronized.</p>
035 *
036 * <p><strong>IMPLEMENTATION NOTE</strong> - Instances of this class can be
037 * successfully serialized and deserialized <strong>ONLY</strong> if all
038 * property values are <code>Serializable</code>.</p>
039 *
040 * @author Craig McClanahan
041 * @version $Revision: 926529 $ $Date: 2010-03-23 11:44:24 +0000 (Tue, 23 Mar 2010) $
042 */
043
044public class BasicDynaBean implements DynaBean, Serializable {
045
046
047    // ---------------------------------------------------------- Constructors
048
049
050    /**
051     * Construct a new <code>DynaBean</code> associated with the specified
052     * <code>DynaClass</code> instance.
053     *
054     * @param dynaClass The DynaClass we are associated with
055     */
056    public BasicDynaBean(DynaClass dynaClass) {
057
058        super();
059        this.dynaClass = dynaClass;
060
061    }
062
063
064    // ---------------------------------------------------- Instance Variables
065
066
067    /**
068     * The <code>DynaClass</code> "base class" that this DynaBean
069     * is associated with.
070     */
071    protected DynaClass dynaClass = null;
072
073
074    /**
075     * The set of property values for this DynaBean, keyed by property name.
076     */
077    protected HashMap values = new HashMap();
078
079    /** Map decorator for this DynaBean */
080    private transient Map mapDecorator;
081
082    /**
083     * Return a Map representation of this DynaBean.
084     * </p>
085     * This, for example, could be used in JSTL in the following way to access
086     * a DynaBean's <code>fooProperty</code>:
087     * <ul><li><code>${myDynaBean.<b>map</b>.fooProperty}</code></li></ul>
088     *
089     * @return a Map representation of this DynaBean
090     * @since 1.8.0
091     */
092    public Map getMap() {
093
094        // cache the Map
095        if (mapDecorator == null) {
096            mapDecorator = new DynaBeanMapDecorator(this);
097        }
098        return mapDecorator;
099
100    }
101
102    // ------------------------------------------------------ DynaBean Methods
103
104
105    /**
106     * Does the specified mapped property contain a value for the specified
107     * key value?
108     *
109     * @param name Name of the property to check
110     * @param key Name of the key to check
111     * @return <code>true<code> if the mapped property contains a value for
112     * the specified key, otherwise <code>false</code>
113     *
114     * @exception IllegalArgumentException if there is no property
115     *  of the specified name
116     */
117    public boolean contains(String name, String key) {
118
119        Object value = values.get(name);
120        if (value == null) {
121            throw new NullPointerException
122                    ("No mapped value for '" + name + "(" + key + ")'");
123        } else if (value instanceof Map) {
124            return (((Map) value).containsKey(key));
125        } else {
126            throw new IllegalArgumentException
127                    ("Non-mapped property for '" + name + "(" + key + ")'");
128        }
129
130    }
131
132
133    /**
134     * Return the value of a simple property with the specified name.
135     *
136     * @param name Name of the property whose value is to be retrieved
137     * @return The property's value
138     *
139     * @exception IllegalArgumentException if there is no property
140     *  of the specified name
141     */
142    public Object get(String name) {
143
144        // Return any non-null value for the specified property
145        Object value = values.get(name);
146        if (value != null) {
147            return (value);
148        }
149
150        // Return a null value for a non-primitive property
151        Class type = getDynaProperty(name).getType();
152        if (!type.isPrimitive()) {
153            return (value);
154        }
155
156        // Manufacture default values for primitive properties
157        if (type == Boolean.TYPE) {
158            return (Boolean.FALSE);
159        } else if (type == Byte.TYPE) {
160            return (new Byte((byte) 0));
161        } else if (type == Character.TYPE) {
162            return (new Character((char) 0));
163        } else if (type == Double.TYPE) {
164            return (new Double(0.0));
165        } else if (type == Float.TYPE) {
166            return (new Float((float) 0.0));
167        } else if (type == Integer.TYPE) {
168            return (new Integer(0));
169        } else if (type == Long.TYPE) {
170            return (new Long(0));
171        } else if (type == Short.TYPE) {
172            return (new Short((short) 0));
173        } else {
174            return (null);
175        }
176
177    }
178
179
180    /**
181     * Return the value of an indexed property with the specified name.
182     *
183     * @param name Name of the property whose value is to be retrieved
184     * @param index Index of the value to be retrieved
185     * @return The indexed property's value
186     *
187     * @exception IllegalArgumentException if there is no property
188     *  of the specified name
189     * @exception IllegalArgumentException if the specified property
190     *  exists, but is not indexed
191     * @exception IndexOutOfBoundsException if the specified index
192     *  is outside the range of the underlying property
193     * @exception NullPointerException if no array or List has been
194     *  initialized for this property
195     */
196    public Object get(String name, int index) {
197
198        Object value = values.get(name);
199        if (value == null) {
200            throw new NullPointerException
201                    ("No indexed value for '" + name + "[" + index + "]'");
202        } else if (value.getClass().isArray()) {
203            return (Array.get(value, index));
204        } else if (value instanceof List) {
205            return ((List) value).get(index);
206        } else {
207            throw new IllegalArgumentException
208                    ("Non-indexed property for '" + name + "[" + index + "]'");
209        }
210
211    }
212
213
214    /**
215     * Return the value of a mapped property with the specified name,
216     * or <code>null</code> if there is no value for the specified key.
217     *
218     * @param name Name of the property whose value is to be retrieved
219     * @param key Key of the value to be retrieved
220     * @return The mapped property's value
221     *
222     * @exception IllegalArgumentException if there is no property
223     *  of the specified name
224     * @exception IllegalArgumentException if the specified property
225     *  exists, but is not mapped
226     */
227    public Object get(String name, String key) {
228
229        Object value = values.get(name);
230        if (value == null) {
231            throw new NullPointerException
232                    ("No mapped value for '" + name + "(" + key + ")'");
233        } else if (value instanceof Map) {
234            return (((Map) value).get(key));
235        } else {
236            throw new IllegalArgumentException
237                    ("Non-mapped property for '" + name + "(" + key + ")'");
238        }
239
240    }
241
242
243    /**
244     * Return the <code>DynaClass</code> instance that describes the set of
245     * properties available for this DynaBean.
246     *
247     * @return The associated DynaClass
248     */
249    public DynaClass getDynaClass() {
250
251        return (this.dynaClass);
252
253    }
254
255
256    /**
257     * Remove any existing value for the specified key on the
258     * specified mapped property.
259     *
260     * @param name Name of the property for which a value is to
261     *  be removed
262     * @param key Key of the value to be removed
263     *
264     * @exception IllegalArgumentException if there is no property
265     *  of the specified name
266     */
267    public void remove(String name, String key) {
268
269        Object value = values.get(name);
270        if (value == null) {
271            throw new NullPointerException
272                    ("No mapped value for '" + name + "(" + key + ")'");
273        } else if (value instanceof Map) {
274            ((Map) value).remove(key);
275        } else {
276            throw new IllegalArgumentException
277                    ("Non-mapped property for '" + name + "(" + key + ")'");
278        }
279
280    }
281
282
283    /**
284     * Set the value of a simple property with the specified name.
285     *
286     * @param name Name of the property whose value is to be set
287     * @param value Value to which this property is to be set
288     *
289     * @exception ConversionException if the specified value cannot be
290     *  converted to the type required for this property
291     * @exception IllegalArgumentException if there is no property
292     *  of the specified name
293     * @exception NullPointerException if an attempt is made to set a
294     *  primitive property to null
295     */
296    public void set(String name, Object value) {
297
298        DynaProperty descriptor = getDynaProperty(name);
299        if (value == null) {
300            if (descriptor.getType().isPrimitive()) {
301                throw new NullPointerException
302                        ("Primitive value for '" + name + "'");
303            }
304        } else if (!isAssignable(descriptor.getType(), value.getClass())) {
305            throw new ConversionException
306                    ("Cannot assign value of type '" +
307                    value.getClass().getName() +
308                    "' to property '" + name + "' of type '" +
309                    descriptor.getType().getName() + "'");
310        }
311        values.put(name, value);
312
313    }
314
315
316    /**
317     * Set the value of an indexed property with the specified name.
318     *
319     * @param name Name of the property whose value is to be set
320     * @param index Index of the property to be set
321     * @param value Value to which this property is to be set
322     *
323     * @exception ConversionException if the specified value cannot be
324     *  converted to the type required for this property
325     * @exception IllegalArgumentException if there is no property
326     *  of the specified name
327     * @exception IllegalArgumentException if the specified property
328     *  exists, but is not indexed
329     * @exception IndexOutOfBoundsException if the specified index
330     *  is outside the range of the underlying property
331     */
332    public void set(String name, int index, Object value) {
333
334        Object prop = values.get(name);
335        if (prop == null) {
336            throw new NullPointerException
337                    ("No indexed value for '" + name + "[" + index + "]'");
338        } else if (prop.getClass().isArray()) {
339            Array.set(prop, index, value);
340        } else if (prop instanceof List) {
341            try {
342                ((List) prop).set(index, value);
343            } catch (ClassCastException e) {
344                throw new ConversionException(e.getMessage());
345            }
346        } else {
347            throw new IllegalArgumentException
348                    ("Non-indexed property for '" + name + "[" + index + "]'");
349        }
350
351    }
352
353
354    /**
355     * Set the value of a mapped property with the specified name.
356     *
357     * @param name Name of the property whose value is to be set
358     * @param key Key of the property to be set
359     * @param value Value to which this property is to be set
360     *
361     * @exception ConversionException if the specified value cannot be
362     *  converted to the type required for this property
363     * @exception IllegalArgumentException if there is no property
364     *  of the specified name
365     * @exception IllegalArgumentException if the specified property
366     *  exists, but is not mapped
367     */
368    public void set(String name, String key, Object value) {
369
370        Object prop = values.get(name);
371        if (prop == null) {
372            throw new NullPointerException
373                    ("No mapped value for '" + name + "(" + key + ")'");
374        } else if (prop instanceof Map) {
375            ((Map) prop).put(key, value);
376        } else {
377            throw new IllegalArgumentException
378                    ("Non-mapped property for '" + name + "(" + key + ")'");
379        }
380
381    }
382
383
384    // ------------------------------------------------------ Protected Methods
385
386
387    /**
388     * Return the property descriptor for the specified property name.
389     *
390     * @param name Name of the property for which to retrieve the descriptor
391     * @return The property descriptor
392     *
393     * @exception IllegalArgumentException if this is not a valid property
394     *  name for our DynaClass
395     */
396    protected DynaProperty getDynaProperty(String name) {
397
398        DynaProperty descriptor = getDynaClass().getDynaProperty(name);
399        if (descriptor == null) {
400            throw new IllegalArgumentException
401                    ("Invalid property name '" + name + "'");
402        }
403        return (descriptor);
404
405    }
406
407
408    /**
409     * Is an object of the source class assignable to the destination class?
410     *
411     * @param dest Destination class
412     * @param source Source class
413     * @return <code>true</code> if the source class is assignable to the
414     * destination class, otherwise <code>false</code>
415     */
416    protected boolean isAssignable(Class dest, Class source) {
417
418        if (dest.isAssignableFrom(source) ||
419                ((dest == Boolean.TYPE) && (source == Boolean.class)) ||
420                ((dest == Byte.TYPE) && (source == Byte.class)) ||
421                ((dest == Character.TYPE) && (source == Character.class)) ||
422                ((dest == Double.TYPE) && (source == Double.class)) ||
423                ((dest == Float.TYPE) && (source == Float.class)) ||
424                ((dest == Integer.TYPE) && (source == Integer.class)) ||
425                ((dest == Long.TYPE) && (source == Long.class)) ||
426                ((dest == Short.TYPE) && (source == Short.class))) {
427            return (true);
428        } else {
429            return (false);
430        }
431
432    }
433
434
435}