Source Code Cross Referenced for StandardPropertyDescriptor.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.beans.IntrospectionException;
033:        import java.beans.PropertyDescriptor;
034:        import java.lang.reflect.Method;
035:
036:        import com.jeta.forms.gui.common.FormException;
037:        import com.jeta.forms.logger.FormsLogger;
038:
039:        /**
040:         * A <code>StandardPropertyDescriptor</code> is basically just a proxy for a
041:         * standard Java Bean PropertyDescriptor.
042:         * 
043:         * @author Jeff Tassin
044:         */
045:        public class StandardPropertyDescriptor implements 
046:                JETAPropertyDescriptor {
047:            /**
048:             * The underlying PropertyDescriptor for a Java Bean property.
049:             */
050:            private PropertyDescriptor m_delegate;
051:
052:            /**
053:             * A simple value array so we don't have to re-instantiate every time we
054:             * call setPropertyValue.
055:             */
056:            private Object[] m_set_value = new Object[1];
057:
058:            /**
059:             * Creates a <code>StandardPropertyDescriptor</code> instance with the
060:             * specified PropertyDescriptor delegate.
061:             */
062:            public StandardPropertyDescriptor(PropertyDescriptor delegate)
063:                    throws IntrospectionException, IllegalAccessException {
064:                m_delegate = delegate;
065:            }
066:
067:            /**
068:             * Equals implementation. Just forward to the delegate
069:             */
070:            public boolean equals(Object obj) {
071:                return m_delegate.equals(obj);
072:            }
073:
074:            /**
075:             * Return the display name for the property.
076:             */
077:            public String getDisplayName() {
078:                return m_delegate.getDisplayName();
079:            }
080:
081:            /**
082:             * Return the name of the property.
083:             */
084:            public String getName() {
085:                return m_delegate.getName();
086:            }
087:
088:            /**
089:             * Returns the value of the associated property in the given bean.
090:             * 
091:             * @return the value for property
092:             */
093:            public Object getPropertyValue(JETABean bean) throws FormException {
094:                Method getter = m_delegate.getReadMethod();
095:                try {
096:                    Object value = null;
097:                    if (getter != null) {
098:                        Class[] paramTypes = getter.getParameterTypes();
099:                        Object[] args = new Object[paramTypes.length];
100:
101:                        assert (bean != null);
102:                        assert (bean.getDelegate() != null);
103:                        value = getter.invoke(bean.getDelegate(), args);
104:                    }
105:                    return value;
106:                } catch (Exception e) {
107:                    System.out
108:                            .println("StandardPropertyDescriptor.failed for property: "
109:                                    + m_delegate.getName()
110:                                    + "   declaringClass: "
111:                                    + getter.getDeclaringClass()
112:                                    + "   "
113:                                    + bean.getDelegate());
114:                    e.printStackTrace();
115:                }
116:                return null;
117:            }
118:
119:            /**
120:             * Gets a PropertyEditor class that has been registered for the property.
121:             * Null is returned if no property editor class has been registered.
122:             */
123:            public Class getPropertyEditorClass() {
124:                return m_delegate.getPropertyEditorClass();
125:            }
126:
127:            /**
128:             * Returns the class object for the property.
129:             */
130:            public Class getPropertyType() {
131:                return m_delegate.getPropertyType();
132:            }
133:
134:            /**
135:             * Gets the short description for the property.
136:             */
137:            public String getShortDescription() {
138:                return m_delegate.getShortDescription();
139:            }
140:
141:            /**
142:             * Returns a method object used to set the property value. Null is returned
143:             * if the property is not writable.
144:             */
145:            public Method getWriteMethod() {
146:                return m_delegate.getWriteMethod();
147:            }
148:
149:            /**
150:             * The "hidden" flag is used to identify features that are intended only for
151:             * tool use, and which should not be exposed to humans.
152:             */
153:            public boolean isHidden() {
154:                return m_delegate.isHidden();
155:            }
156:
157:            /**
158:             * The "preferred" flag is used to identify features that are particularly
159:             * important for presenting to humans
160:             */
161:            public boolean isPreferred() {
162:                return m_delegate.isPreferred();
163:            }
164:
165:            /**
166:             * Returns true if the underlying property should not be stored.
167:             */
168:            public boolean isTransient() {
169:                /** all standard properties are not transient */
170:                return false;
171:            }
172:
173:            /**
174:             * Returns true if the property is writable.
175:             */
176:            public boolean isWritable() {
177:                return (m_delegate.getWriteMethod() != null);
178:            }
179:
180:            /**
181:             * Sets this property to preferred.
182:             */
183:            public void setPreferred(boolean bpref) {
184:                m_delegate.setPreferred(bpref);
185:            }
186:
187:            /**
188:             * Sets the value for this property on the given bean.
189:             * 
190:             * @param bean
191:             *            the JETABean that contains the property to set
192:             * @param value
193:             *            the value of the property
194:             */
195:            public void setPropertyValue(JETABean bean, Object value)
196:                    throws FormException {
197:                try {
198:                    Method setter = m_delegate.getWriteMethod();
199:                    if (setter != null) {
200:                        m_set_value[0] = value;
201:                        setter.invoke(bean.getDelegate(), m_set_value);
202:                    }
203:                } catch (Exception e) {
204:                    FormsLogger.debug("failed to set property: " + getName());
205:                    FormsLogger.debug(e);
206:                }
207:            }
208:
209:        }
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