001: /* ====================================================================
002: * The Jcorporate Apache Style Software License, Version 1.2 05-07-2002
003: *
004: * Copyright (c) 1995-2002 Jcorporate Ltd. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above copyright
011: * notice, this list of conditions and the following disclaimer.
012: *
013: * 2. Redistributions in binary form must reproduce the above copyright
014: * notice, this list of conditions and the following disclaimer in
015: * the documentation and/or other materials provided with the
016: * distribution.
017: *
018: * 3. The end-user documentation included with the redistribution,
019: * if any, must include the following acknowledgment:
020: * "This product includes software developed by Jcorporate Ltd.
021: * (http://www.jcorporate.com/)."
022: * Alternately, this acknowledgment may appear in the software itself,
023: * if and wherever such third-party acknowledgments normally appear.
024: *
025: * 4. "Jcorporate" and product names such as "Expresso" must
026: * not be used to endorse or promote products derived from this
027: * software without prior written permission. For written permission,
028: * please contact info@jcorporate.com.
029: *
030: * 5. Products derived from this software may not be called "Expresso",
031: * or other Jcorporate product names; nor may "Expresso" or other
032: * Jcorporate product names appear in their name, without prior
033: * written permission of Jcorporate Ltd.
034: *
035: * 6. No product derived from this software may compete in the same
036: * market space, i.e. framework, without prior written permission
037: * of Jcorporate Ltd. For written permission, please contact
038: * partners@jcorporate.com.
039: *
040: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
041: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
042: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
043: * DISCLAIMED. IN NO EVENT SHALL JCORPORATE LTD OR ITS CONTRIBUTORS
044: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
045: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
046: * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
047: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
048: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
049: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
050: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
051: * SUCH DAMAGE.
052: * ====================================================================
053: *
054: * This software consists of voluntary contributions made by many
055: * individuals on behalf of the Jcorporate Ltd. Contributions back
056: * to the project(s) are encouraged when you make modifications.
057: * Please send them to support@jcorporate.com. For more information
058: * on Jcorporate Ltd. and its products, please see
059: * <http://www.jcorporate.com/>.
060: *
061: * Portions of this software are based upon other open source
062: * products and are subject to their respective licenses.
063: */
064:
065: package com.jcorporate.expresso.core.dataobjects;
066:
067: /**
068: * Constructs 'often' DataObjects based upon standard order of initialization
069: * and the interfaces it implements. For example, Defineable objects must
070: * have setDefinition() called first, then setDataContext(), then setUid()
071: *
072: * @author Michael Rimov
073: */
074:
075: public final class DataObjectFactory {
076:
077: private DataObjectFactory() {
078: }
079:
080: /**
081: * Creates an object that doesn't implement Defineable.
082: *
083: * @param clazz Object class name
084: * @param dataContext Database context
085: * @param uid the user id that will be set if the object is Securable
086: * @return an instantiated and properly constructed object.
087: * @throws DataException upon error
088: */
089: public static Object createObject(Class clazz, String dataContext,
090: int uid) throws DataException {
091: return DataObjectFactory.createObject(clazz, dataContext, null,
092: uid);
093:
094: }
095:
096: /**
097: * Typesafe way of creating a data object that doesn't implement Defineable
098: *
099: * @param clazz Object class
100: * @param dataContext Database context
101: * @param uid the user id that will be set if the object is Securable
102: * @return an instantiated and properly constructed object.
103: * @throws DataException upon error
104: */
105: public static DataObject createDataObject(Class clazz,
106: String dataContext, int uid) throws DataException {
107: return (DataObject) DataObjectFactory.createObject(clazz,
108: dataContext, null, uid);
109: }
110:
111: /**
112: * Typesafe way of creating a dataobject
113: *
114: * @param definition The definition to define the Defineable Object. If
115: * the object does not implement Defineable, this parameter may be null.
116: * @param clazz Object class
117: * @param dataContext Database context
118: * @param uid the user id that will be set if the object is Securable
119: * @return an instantiated and properly constructed DataObject.
120: * @throws DataException upon error
121: */
122: public static DataObject createDataObject(Class clazz,
123: String dataContext, String definition, int uid)
124: throws DataException {
125: return (DataObject) DataObjectFactory.createObject(clazz,
126: dataContext, definition, uid);
127: }
128:
129: /**
130: * Create an object given the class, datacontext, definition and uid.
131: *
132: * @param definition The definition to define the Defineable Object. If
133: * the object does not implement Defineable, this parameter may be null.
134: * @param clazz Object class
135: * @param dataContext Database context
136: * @param uid the user id that will be set if the object is Securable
137: * @return an instantiated and properly constructed object.
138: * @throws DataException upon error
139: */
140: public static Object createObject(Class clazz, String dataContext,
141: String definition, int uid) throws DataException {
142: Object returnValue;
143: try {
144: returnValue = clazz.newInstance();
145: } catch (IllegalAccessException ex) {
146: throw new DataException("No default constructor for: "
147: + clazz.getName(), ex);
148: } catch (InstantiationException ex) {
149: throw new DataException("Error creating new instance of "
150: + clazz.getName(), ex);
151: }
152:
153: if (returnValue instanceof Defineable) {
154: if (definition == null) {
155: throw new IllegalArgumentException(
156: "Must have non-null "
157: + "definition for Defineable objects!");
158: }
159:
160: ((Defineable) returnValue).setDefinitionName(definition);
161: }
162:
163: if (returnValue instanceof ContextNested) {
164: ((ContextNested) returnValue).setDataContext(dataContext);
165: }
166:
167: if (returnValue instanceof Securable) {
168: ((Securable) returnValue).setRequestingUid(uid);
169: }
170:
171: return returnValue;
172: }
173: }
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