Source Code Cross Referenced for ComMethod.java in  » Scripting » oscript-2.10.4 » oscript » data » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » oscript 2.10.4 » oscript.data 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*=============================================================================
002:         *     Copyright Texas Instruments 2000-2004.  All Rights Reserved.
003:         *   
004:         * This program is free software; you can redistribute it and/or
005:         * modify it under the terms of the GNU Lesser General Public
006:         * License as published by the Free Software Foundation; either
007:         * version 2 of the License, or (at your option) any later version.
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 GNU
012:         * Lesser General Public License for more details.
013:         * 
014:         * You should have received a copy of the GNU Lesser General Public
015:         * License along with this library; if not, write to the Free Software
016:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
017:         * 
018:         * $ProjectHeader: OSCRIPT 0.155 Fri, 20 Dec 2002 18:34:22 -0800 rclark $
019:         */
020:
021:        package oscript.data;
022:
023:        import oscript.DefaultParser;
024:        import oscript.exceptions.*;
025:
026:        /**
027:         * A <code>ComMethod</code> object is a wrapper for a method of a COM
028:         * object
029:         * 
030:         * @author Rob Clark (rob@ti.com)
031:         */
032:        public class ComMethod extends Value {
033:            /**
034:             * The type object for an instance of ComMethod.
035:             */
036:            public final static Value TYPE = BuiltinType
037:                    .makeBuiltinType("oscript.data.ComMethod");
038:            public final static String PARENT_TYPE_NAME = "oscript.data.OObject";
039:            public final static String TYPE_NAME = "ComMethod";
040:            public final static String[] MEMBER_NAMES = new String[] {
041:                    "getType", "castToString", "bopInstanceOf", "bopEquals",
042:                    "bopNotEquals", "callAsFunction" };
043:
044:            /**
045:             * The dispatch-pointer object is our handle to the COM object.
046:             */
047:            private org.jawin.DispatchPtr dptr;
048:
049:            /**
050:             * The name of the method.
051:             */
052:            private String name;
053:
054:            /**
055:             * Class Constructor.
056:             * 
057:             * @param dptr         the dispatch-ptr object
058:             * @param name         the name of the method
059:             */
060:            ComMethod(org.jawin.DispatchPtr dptr, String name) {
061:                super ();
062:
063:                this .dptr = dptr;
064:                this .name = name;
065:            }
066:
067:            /**
068:             * For benefit of <code>BuiltinType</code>... always throws an exception because
069:             * script code should not be allowed to directly create an instance...
070:             * 
071:             * @param args         arguments to this constructor
072:             * @throws PackagedScriptObjectException(Exception) if wrong number of args
073:             */
074:            public ComMethod(oscript.util.MemberTable args) {
075:                throw PackagedScriptObjectException
076:                        .makeExceptionWrapper(new OIllegalArgumentException(
077:                                "wrong number of args!"));
078:            }
079:
080:            /* XXX should re-implement bopEquals/bopNotEquals/equals/hashCode to do the 
081:             * right thing... two instances that are wrapping the same method should
082:             * appear to be equals()
083:             */
084:
085:            /**
086:             * Get the type of this object.  The returned type doesn't have to take
087:             * into account the possibility of a script type extending a built-in
088:             * type, since that is handled by {@link #getType}.
089:             * 
090:             * @return the object's type
091:             */
092:            protected Value getTypeImpl() {
093:                return TYPE;
094:            }
095:
096:            /**
097:             * Call this object as a function.
098:             * 
099:             * @param sf           the current stack frame
100:             * @param args         the arguments to the function, or <code>null</code> if none
101:             * @return the value returned by the function
102:             * @throws PackagedScriptObjectException
103:             */
104:            public Value callAsFunction(oscript.util.StackFrame sf,
105:                    oscript.util.MemberTable args)
106:                    throws PackagedScriptObjectException {
107:                try {
108:                    Object[] javaArgs;
109:
110:                    if (args != null) {
111:                        javaArgs = new Object[args.length()];
112:                        if (JavaBridge.convertArgs(INVOKEN_PARAMETER_TYPES,
113:                                javaArgs, args) < 0)
114:                            throw PackagedScriptObjectException
115:                                    .makeExceptionWrapper(new OIllegalArgumentException(
116:                                            "wrong arg types!"));
117:                    } else {
118:                        javaArgs = EMPTY_ARGS;
119:                    }
120:
121:                    // NOTE:  support for side-effects commented out, since I'm not sure if it is a good idea or not
122:                    //        // store copy of original values
123:                    //        Object[] javaArgsCopy = new Object[javaArgs.length];
124:                    //        System.arraycopy( javaArgs, 0, javaArgsCopy, 0, javaArgs.length );
125:
126:                    Object result = dptr.invokeN(name, javaArgs);
127:
128:                    //        for( int i=0; i<javaArgs.length; i++ )
129:                    //          if( javaArgs[i] != javaArgsCopy[i] )
130:                    //            args[i].opAssign( JavaBridge.convertToScriptObject( javaArgs[i] ) );
131:
132:                    if (result instanceof  org.jawin.DispatchPtr)
133:                        return new ComObject((org.jawin.DispatchPtr) result);
134:
135:                    return JavaBridge.convertToScriptObject(result);
136:                } catch (org.jawin.COMException e) {
137:                    throw OJavaException.makeJavaExceptionWrapper(e);
138:                }
139:            }
140:
141:            static final Class[] INVOKEN_PARAMETER_TYPES = new Class[] {
142:                    Object.class, Object.class, Object.class, Object.class,
143:                    Object.class, Object.class, Object.class, Object.class,
144:                    Object.class, Object.class, Object.class, Object.class,
145:                    Object.class, Object.class, Object.class, Object.class,
146:                    Object.class, Object.class, Object.class, Object.class };
147:
148:            static final Object[] EMPTY_ARGS = new Object[0];
149:        }
150:
151:        /*
152:         *   Local Variables:
153:         *   tab-width: 2
154:         *   indent-tabs-mode: nil
155:         *   mode: java
156:         *   c-indentation-style: java
157:         *   c-basic-offset: 2
158:         *   eval: (c-set-offset 'substatement-open '0)
159:         *   eval: (c-set-offset 'case-label '+)
160:         *   eval: (c-set-offset 'inclass '+)
161:         *   eval: (c-set-offset 'inline-open '0)
162:         *   End:
163:         */
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