Source Code Cross Referenced for DynamicPropertyDescriptor.java in  » Swing-Library » abeille-forms-designer » com » jeta » forms » gui » beans » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Swing Library » abeille forms designer » com.jeta.forms.gui.beans 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2004 JETA Software, Inc.  All rights reserved.
003:         * 
004:         * Redistribution and use in source and binary forms, with or without modification, 
005:         * are permitted provided that the following conditions are met:
006:         *
007:         *  o Redistributions of source code must retain the above copyright notice, 
008:         *    this list of conditions and the following disclaimer.
009:         *
010:         *  o Redistributions in binary form must reproduce the above copyright notice, 
011:         *    this list of conditions and the following disclaimer in the documentation 
012:         *    and/or other materials provided with the distribution.
013:         *
014:         *  o Neither the name of JETA Software nor the names of its contributors may 
015:         *    be used to endorse or promote products derived from this software without 
016:         *    specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
021:         * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
022:         * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
023:         * INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
024:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
025:         * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
026:         * INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
027:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
028:         */
029:
030:        package com.jeta.forms.gui.beans;
031:
032:        import java.lang.reflect.Method;
033:
034:        import com.jeta.forms.gui.common.FormException;
035:        import com.jeta.forms.gui.common.FormUtils;
036:        import com.jeta.forms.store.properties.JETAProperty;
037:
038:        /**
039:         * A <code>DynamicPropertyDescriptor</code> is similar to a standard Java
040:         * Beans PropertyDescriptor. However, these descriptors can be dynamically added
041:         * and removed. For example, some Swing components such as JTables and JLists
042:         * are almost always contained within a JScrollPane. So, instead of working with
043:         * a JScrollPane, we add a scrollable property to the Swing components instead.
044:         * This scrollable property is an example of a dynamic property since it is not
045:         * defined by the Java Bean. Dynamic properties are defined by a
046:         * <code>DynamicPropertyDescriptor</code> and are assigned to a bean using
047:         * <code>BeanFactory</code> instances.
048:         * 
049:         * @author Jeff Tassin
050:         */
051:        public class DynamicPropertyDescriptor implements 
052:                JETAPropertyDescriptor {
053:            /** The name of the property associated with this descriptor */
054:            private String m_name;
055:
056:            /** The type of the property value associated with this descriptor */
057:            private Class m_type;
058:
059:            /**
060:             * Flag that indicates if the property associated with this descriptor is
061:             * preferred or not.
062:             */
063:            private boolean m_preferred;
064:
065:            /**
066:             * Flag that indicates if this property associated with this descriptor can
067:             * be stored. Set to true if the property should not be stored.
068:             */
069:            private boolean m_transient = false;
070:
071:            /**
072:             * Creates a <code>DynamicPropertyDescriptor</code> instance with the
073:             * specified name, type and preferred/transient flags.
074:             * 
075:             * @param name
076:             *            the programmatic name for the property
077:             * @param type
078:             *            the type for the property
079:             * @param pref
080:             *            set to true if the property is a preferred property.
081:             * @param istransient
082:             *            set to true if the property value is NOT persistent.
083:             */
084:            public DynamicPropertyDescriptor(String name, Class type,
085:                    boolean pref, boolean istransient) {
086:                m_name = name;
087:                m_type = type;
088:                m_preferred = pref;
089:                m_transient = istransient;
090:            }
091:
092:            /** @return the value for this property */
093:            public Object getPropertyValue(JETABean bean) throws FormException {
094:                return bean.getCustomProperty(getName());
095:            }
096:
097:            /** @return the name of the property associated with this descriptor */
098:            public String getName() {
099:                return m_name;
100:            }
101:
102:            /**
103:             * Return the display name for the property.
104:             */
105:            public String getDisplayName() {
106:                return getName();
107:            }
108:
109:            /**
110:             * Gets the short description for the property.
111:             */
112:            public String getShortDescription() {
113:                return getName();
114:            }
115:
116:            /**
117:             * Gets a PropertyEditor class that has been registered for the property.
118:             * Null is returned if no property editor class has been registered. Not
119:             * currently used for any dynamic properties.
120:             */
121:            public Class getPropertyEditorClass() {
122:                return null;
123:            }
124:
125:            /** @return the type of the property value associated with this descriptor */
126:            public Class getPropertyType() {
127:                return m_type;
128:            }
129:
130:            /**
131:             * Dynamic properties do not use write methods. Instead, they must implement
132:             * updateBean() method of JETAProperty. Always returns null.
133:             */
134:            public Method getWriteMethod() {
135:                return null;
136:            }
137:
138:            /**
139:             * The "preferred" flag is used to identify features that are particularly
140:             * important for presenting to humans
141:             */
142:            public boolean isPreferred() {
143:                return m_preferred;
144:            }
145:
146:            /**
147:             * The "hidden" flag is used to identify features that are intended only for
148:             * tool use, and which should not be exposed to humans.
149:             */
150:            public boolean isHidden() {
151:                return false;
152:            }
153:
154:            /**
155:             * Returns true if the underlying property should not be stored.
156:             */
157:            public boolean isTransient() {
158:                return m_transient;
159:            }
160:
161:            /**
162:             * Returns true if the property is writable. Dynamic properties are always
163:             * writable (currently).
164:             */
165:            public boolean isWritable() {
166:                return true;
167:            }
168:
169:            /**
170:             * Sets the value for the property associated with this descriptor. This is
171:             * potentially a two step process. First, the property value itself is
172:             * updated. This may or may not have an effect on the bean - it depends on
173:             * the type of property. Second, we tell the property to update the bean.
174:             * Some properties require a two step process because of the nature of the
175:             * property. For example, a scrollable property has a value that defines
176:             * when scroll bars should be displayed. Additionally, we need to tell the
177:             * scroll property to update the bean after its value has been set. This
178:             * action instantiates the JScrollPane instance and substitutes it for the
179:             * actual java bean on the form.
180:             * 
181:             * @param bean
182:             *            the JETABean object whose property we are setting.
183:             * @param value
184:             *            the value of the property to set.
185:             */
186:            public void setPropertyValue(JETABean bean, Object value)
187:                    throws FormException {
188:                JETAProperty old_prop = bean.getCustomProperty(getName());
189:                FormUtils.safeAssert(old_prop != null);
190:                if (old_prop != null) {
191:                    if (value instanceof  JETAProperty
192:                            && value.getClass() == old_prop.getClass()) {
193:                        JETAProperty prop = (JETAProperty) value;
194:                        if (!getName().equals(prop.getName())) {
195:                            /** This should never happen */
196:                            System.out
197:                                    .println("DynamicPropertyDescriptor.setPropertyValue  getName(): "
198:                                            + getName()
199:                                            + "  prop.getName(): "
200:                                            + prop.getName());
201:                            FormUtils.safeAssert(false);
202:                        }
203:
204:                        try {
205:                            if (FormUtils.isDesignMode()) {
206:                                /**
207:                                 * We make a copy of the property mainly to support
208:                                 * undo/redo when setting properties in the designer.
209:                                 */
210:                                prop = (JETAProperty) value.getClass()
211:                                        .newInstance();
212:                                prop.setValue(value);
213:                                bean.setCustomProperty(getName(), prop);
214:                                prop.updateBean(bean);
215:                                return;
216:                            }
217:                        } catch (Exception e) {
218:                            e.printStackTrace();
219:                        }
220:                    }
221:
222:                    old_prop.setValue(value);
223:                    old_prop.updateBean(bean);
224:                }
225:            }
226:
227:            /**
228:             * Sets this property to preferred.
229:             */
230:            public void setPreferred(boolean bpref) {
231:                m_preferred = bpref;
232:            }
233:
234:        }
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