Source Code Cross Referenced for SIcon.java in  » J2EE » Sofia » com » salmonllc » swing » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » Sofia » com.salmonllc.swing 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        //** Copyright Statement ***************************************************
002:        //The Salmon Open Framework for Internet Applications (SOFIA)
003:        // Copyright (C) 1999 - 2002, Salmon LLC
004:        //
005:        // This program is free software; you can redistribute it and/or
006:        // modify it under the terms of the GNU General Public License version 2
007:        // as published by the Free Software Foundation;
008:        //
009:        // This program is distributed in the hope that it will be useful,
010:        // but WITHOUT ANY WARRANTY; without even the implied warranty of
011:        // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
012:        // GNU General Public License for more details.
013:        //
014:        // You should have received a copy of the GNU General Public License
015:        // along with this program; if not, write to the Free Software
016:        // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
017:        //
018:        // For more information please visit http://www.salmonllc.com
019:        //** End Copyright Statement ***************************************************
020:
021:        package com.salmonllc.swing;
022:
023:        import com.salmonllc.sql.*;
024:        import com.salmonllc.swing.events.ValueChangedEvent;
025:
026:        import javax.swing.*;
027:        import java.awt.*;
028:        import java.net.URL;
029:        import java.net.MalformedURLException;
030:
031:        /**
032:         * SOFIA implementation of a Swing ImageIcon. This icon allows binding to DataStore columns for either an image URL or an image byte array.
033:         */
034:        public class SIcon extends ImageIcon implements  ModelChangedListener,
035:                SComponent {
036:            private DataStoreEvaluator _eval;
037:            private Object _currentValue;
038:            private JComponent _parent;
039:
040:            /**
041:             * Creates a new SIcon
042:             */
043:            public SIcon() {
044:                _currentValue = null;
045:            }
046:
047:            /**
048:             * Binds the component to a DataStore expression
049:             * @param buf The DataStore to bind to
050:             * @param expression The DataStore expression to compute. It can return a url string or a byte array.
051:             * @throws DataStoreException if the expression is invalid
052:             */
053:            public void setExpression(DataStoreBuffer buf, String expression)
054:                    throws DataStoreException {
055:                _eval = new DataStoreEvaluator(buf, expression);
056:                buf.addModelChangedListener(this );
057:                evalExpression();
058:            }
059:
060:            /**
061:             * Binds the component to a DataStore expression. It can return a url string or a byte array.
062:             * @param buf The DataStore to bind to
063:             * @param expression The DataStore expression to compute
064:             * @throws DataStoreException if the expression is invalid
065:             */
066:            public void setExpression(DataStoreBuffer buf,
067:                    DataStoreExpression expression) throws DataStoreException {
068:                _eval = new DataStoreEvaluator(buf, expression);
069:                buf.addModelChangedListener(this );
070:                evalExpression();
071:            }
072:
073:            /**
074:             * Part of the model changed listener interface, don't call this method directly
075:             */
076:            public void modelChanged(ModelChangedEvent evt) {
077:                evalExpression();
078:            }
079:
080:            private void evalExpression() {
081:                Object o = null;
082:                try {
083:                    if (_eval != null)
084:                        o = _eval.evaluateRow();
085:
086:                    if (!SComponentHelper.valuesEqual(o, _currentValue)) {
087:                        Image newImage = null;
088:                        if (o instanceof  String) {
089:                            URL location = new URL((String) o);
090:                            newImage = Toolkit.getDefaultToolkit().getImage(
091:                                    location);
092:                        } else if (o instanceof  byte[]) {
093:                            newImage = Toolkit.getDefaultToolkit().createImage(
094:                                    (byte[]) o);
095:                        }
096:                        if (newImage != null) {
097:                            setImage(newImage);
098:                            loadImage(newImage);
099:                            if (_parent != null) {
100:                                _parent.revalidate();
101:                                _parent.repaint();
102:                            }
103:                        }
104:                    }
105:                } catch (DataStoreException ex) {
106:                    ex.printStackTrace();
107:                } catch (MalformedURLException ex) {
108:                    ex.printStackTrace();
109:                }
110:            }
111:
112:            /**
113:             * This method is used by the framework and should not be called directly
114:             */
115:            public ValueChangedEvent generateValueChangedEvent() {
116:                return null;
117:            }
118:
119:            /**
120:             * This method is used by the framework and should not be called directly
121:             */
122:            public SComponentHelper getHelper() {
123:                return null;
124:            }
125:
126:            /**
127:             * Returns the parent component (may be null)
128:             */
129:            public JComponent getParent() {
130:                return _parent;
131:            }
132:
133:            /**
134:             * Sets the parent component
135:             */
136:            public void setParent(JComponent parent) {
137:                _parent = parent;
138:            }
139:
140:        }
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