Source Code Cross Referenced for CommandContext.java in  » Ajax » Laszlo-4.0.10 » org » openlaszlo » iv » flash » context » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » Laszlo 4.0.10 » org.openlaszlo.iv.flash.context 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: CommandContext.java,v 1.3 2002/04/04 06:38:47 skavish Exp $
003:         *
004:         * ==========================================================================
005:         *
006:         * The JGenerator Software License, Version 1.0
007:         *
008:         * Copyright (c) 2000 Dmitry Skavish (skavish@usa.net). All rights reserved.
009:         *
010:         * Redistribution and use in source and binary forms, with or without
011:         * modification, are permitted provided that the following conditions are met:
012:         *
013:         * 1. Redistributions of source code must retain the above copyright
014:         *    notice, this list of conditions and the following disclaimer.
015:         *
016:         * 2. Redistributions in binary form must reproduce the above copyright
017:         *    notice, this list of conditions and the following disclaimer in
018:         *    the documentation and/or other materials provided with the
019:         *    distribution.
020:         *
021:         * 3. The end-user documentation included with the redistribution, if
022:         *    any, must include the following acknowlegement:
023:         *    "This product includes software developed by Dmitry Skavish
024:         *     (skavish@usa.net, http://www.flashgap.com/)."
025:         *    Alternately, this acknowlegement may appear in the software itself,
026:         *    if and wherever such third-party acknowlegements normally appear.
027:         *
028:         * 4. The name "The JGenerator" must not be used to endorse or promote
029:         *    products derived from this software without prior written permission.
030:         *    For written permission, please contact skavish@usa.net.
031:         *
032:         * 5. Products derived from this software may not be called "The JGenerator"
033:         *    nor may "The JGenerator" appear in their names without prior written
034:         *    permission of Dmitry Skavish.
035:         *
036:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039:         * DISCLAIMED.  IN NO EVENT SHALL DMITRY SKAVISH OR THE OTHER
040:         * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047:         * SUCH DAMAGE.
048:         *
049:         */
050:
051:        package org.openlaszlo.iv.flash.context;
052:
053:        import org.openlaszlo.iv.flash.util.CommandExecutor;
054:        import java.util.*;
055:
056:        /**
057:         * Context which can execute commands as well as substitute variables.
058:         *
059:         * @author Dmitry Skavish
060:         * @see org.openlaszlo.iv.flash.util.CommandExecutor
061:         */
062:        public class CommandContext extends StandardContext {
063:
064:            private CommandExecutor executor;
065:
066:            /**
067:             * Creates command context without parent.
068:             *
069:             * @param executor command executor used to execute commands
070:             */
071:            public CommandContext(CommandExecutor executor) {
072:                this (null, executor);
073:            }
074:
075:            /**
076:             * Creates command context with parent.
077:             *
078:             * @param parent   parent context
079:             * @param executor command executor used to execute commands
080:             */
081:            public CommandContext(Context parent, CommandExecutor executor) {
082:                setParent(parent);
083:                this .executor = executor;
084:            }
085:
086:            public String getValue(String cmd) {
087:                if (cmd.length() != 0 && cmd.charAt(0) == '$') {
088:                    String res = executeCommand(this , cmd);
089:                    if (res != null)
090:                        return res;
091:                }
092:
093:                return super .getValue(cmd);
094:            }
095:
096:            /**
097:             * Executes specified command.<p>
098:             * Supported the following syntax:<BR>
099:             *  <CODE>$command_name[([param1[,param2...]])]</CODE><br>
100:             * parameters can be commands as well, for example:<br>
101:             * <code>$command1($command2(p1,p2),p3)</code>
102:             *
103:             * @param context execution context (the context from which the command was invoked)
104:             * @param cmd    command with possible parameters
105:             * @return result of command execution, never null
106:             */
107:            public String executeCommand(Context context, String cmd) {
108:                //System.out.println( "execute command: '"+cmd+"'" );
109:                int idx = cmd.indexOf('(');
110:                String name;
111:                Vector parms = null;
112:                if (idx == -1) {
113:                    name = cmd.substring(1).trim();
114:                } else {
115:                    name = cmd.substring(1, idx).trim();
116:                    int i = idx + 1;
117:                    parms = new Vector();
118:                    int l = cmd.length();
119:                    int cnt = 0;
120:                    int start = i;
121:                    while (i < l && cnt >= 0) {
122:                        char ch = cmd.charAt(i);
123:                        switch (ch) {
124:                        case '(':
125:                            cnt++;
126:                            break;
127:                        case ')':
128:                            cnt--;
129:                            break;
130:                        case ',':
131:                            if (cnt == 0) {
132:                                String s = cmd.substring(start, i).trim();
133:                                parms.addElement(s);
134:                                start = i + 1;
135:                            }
136:                            break;
137:                        }
138:                        i++;
139:                    }
140:                    i--;
141:                    String s = cmd.substring(start, i).trim();
142:                    if (parms.size() != 0 || s.length() != 0) {
143:                        parms.addElement(s);
144:                    } else {
145:                        parms = null;
146:                    }
147:                }
148:                if (parms != null) {
149:                    for (int i = 0; i < parms.size(); i++) {
150:                        String c = (String) parms.elementAt(i);
151:                        if (c.length() != 0 && c.charAt(0) == '$') {
152:                            String res = executeCommand(context, c);
153:                            if (res == null)
154:                                res = "";
155:                            parms.setElementAt(res, i);
156:                        }
157:                    }
158:                }
159:                return executor.execute(context, name, parms);
160:            }
161:
162:        }
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