Source Code Cross Referenced for RepositoryID.java in  » Collaboration » JacORB » org » jacorb » ir » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Collaboration » JacORB » org.jacorb.ir 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.jacorb.ir;
002:
003:        /*
004:         *        JacORB - a free Java ORB
005:         *
006:         *   Copyright (C) 1997-2004 Gerald Brose.
007:         *
008:         *   This library is free software; you can redistribute it and/or
009:         *   modify it under the terms of the GNU Library General Public
010:         *   License as published by the Free Software Foundation; either
011:         *   version 2 of the License, or (at your option) any later version.
012:         *
013:         *   This library is distributed in the hope that it will be useful,
014:         *   but WITHOUT ANY WARRANTY; without even the implied warranty of
015:         *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
016:         *   Library General Public License for more details.
017:         *
018:         *   You should have received a copy of the GNU Library General Public
019:         *   License along with this library; if not, write to the Free
020:         *   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
021:         */
022:
023:        import java.util.StringTokenizer;
024:        import org.omg.CORBA.portable.BoxedValueHelper;
025:        import org.omg.CORBA.INTF_REPOS;
026:
027:        /**
028:         * This class builds CORBA repository IDs from Java classes
029:         * or class names, or builds Java class names from repository
030:         * IDs
031:         */
032:        public class RepositoryID {
033:            /**
034:             * Returns the fully qualified name of the Java class to which
035:             * the given Repository ID is mapped.
036:             */
037:            public static String className(String repId, ClassLoader loader) {
038:                return className(repId, null, loader);
039:            }
040:
041:            /**
042:             * Returns the fully qualified name of the Java class to which
043:             * the given Repository ID is mapped, with a given suffix appended
044:             * to the class name.  For example, the string "Helper" can be used
045:             * as the suffix to find the helper class for a given Repository ID.
046:             */
047:            public static String className(String repId, String suffix,
048:                    ClassLoader loader) {
049:                if (repId.startsWith("RMI:")) {
050:                    // TODO should convertFromISOLatin1 be called in else branch also?
051:                    repId = convertFromISOLatin1(repId);
052:                    return repId.substring(4, repId.indexOf(':', 4))
053:                            + (suffix != null ? suffix : "");
054:                } else if (repId.startsWith("IDL:")) {
055:                    String id = repId.substring(4, repId.lastIndexOf(':'))
056:                            + (suffix != null ? suffix : "");
057:                    if (id.equals("omg.org/CORBA/WStringValue")) {
058:                        return "java.lang.String";
059:                    }
060:
061:                    int firstSlash = id.indexOf("/");
062:                    final String prefix;
063:                    if (firstSlash == -1) {
064:                        prefix = "";
065:                    } else {
066:                        prefix = id.substring(0, firstSlash);
067:                    }
068:
069:                    if (prefix.equals("omg.org")) {
070:                        return ir2scopes("org.omg", id
071:                                .substring(firstSlash + 1), loader);
072:                    } else if (prefix.indexOf('.') != -1) {
073:                        return ir2scopes(reversePrefix(prefix), id
074:                                .substring(firstSlash + 1), loader);
075:                    } else {
076:                        return ir2scopes("", id, loader);
077:                    }
078:                } else {
079:                    throw new INTF_REPOS("Unrecognized RepositoryID: " + repId);
080:                }
081:            }
082:
083:            /**
084:             * Convert the repository ID with escape sequences back to original strings.
085:             *
086:             * com.sun.corba.se.internal.orbutil.RepositoryId
087:             * contains an implementation of this conversion.
088:             * however the method is private and its an internal sun class.
089:             */
090:            private static String convertFromISOLatin1(String id) {
091:                StringBuffer dest = new StringBuffer(id.length());
092:                int pos = 0;
093:                int index = -1;
094:
095:                while ((index = id.indexOf("\\U", pos)) != -1) {
096:                    dest.append(id.substring(pos, index));
097:                    pos = index + 6;
098:                    // convert the hexa val in 4 char into one char
099:                    char theChar = (char) (Integer.parseInt(id.substring(
100:                            index + 2, index + 6), 16));
101:                    dest.append(theChar);
102:                }
103:                if (pos < id.length()) {
104:                    dest.append(id.substring(pos));
105:                }
106:                return dest.toString();
107:            }
108:
109:            private static final String reversePrefix(String prefix) {
110:                StringTokenizer tok = new StringTokenizer(prefix, ".");
111:                String result = tok.nextToken();
112:
113:                while (tok.hasMoreTokens()) {
114:                    result = tok.nextToken() + '.' + result;
115:                }
116:                return result;
117:            }
118:
119:            /**
120:             * FIXME: This method needs documentation.
121:             * What does this algorithm do, and why is it necessary?  AS.
122:             */
123:            private static String ir2scopes(String prefix, String s,
124:                    ClassLoader loader) {
125:                if (s.indexOf("/") < 0)
126:                    return s;
127:                java.util.StringTokenizer strtok = new java.util.StringTokenizer(
128:                        s, "/");
129:
130:                int count = strtok.countTokens();
131:                StringBuffer sb = new StringBuffer();
132:                sb.append(prefix);
133:
134:                for (int i = 0; strtok.hasMoreTokens(); i++) {
135:                    String sc = strtok.nextToken();
136:                    Class c = null;
137:                    if (sb.toString().length() > 0)
138:                        c = loadClass(sb.toString() + "." + sc, loader);
139:                    else
140:                        c = loadClass(sc, loader);
141:                    if (c == null)
142:                        if (sb.toString().length() > 0)
143:                            sb.append("." + sc);
144:                        else
145:                            sb.append(sc);
146:                    else if (i < count - 1)
147:                        sb.append("." + sc + "Package");
148:                    else
149:                        sb.append("." + sc);
150:                }
151:
152:                return sb.toString();
153:            }
154:
155:            public static String repId(Class c) {
156:                if (org.omg.CORBA.portable.IDLEntity.class.isAssignableFrom(c)) {
157:                    String className = c.getName();
158:                    String body = "";
159:
160:                    // add "IDL:" and ":1.0"
161:                    // and swap "org.omg" if necessary
162:
163:                    if (className.startsWith("org.omg")
164:                            || className.startsWith("org/omg")) {
165:                        if (className.length() > 7)
166:                            body = className.substring(7);
167:                        return "IDL:omg.org/" + scopesToIR(body) + ":1.0";
168:                    }
169:                    return "IDL:" + scopesToIR(className) + ":1.0";
170:                }
171:                return org.jacorb.util.ValueHandler.getRMIRepositoryID(c);
172:            }
173:
174:            private static String scopesToIR(String s) {
175:                if (s.indexOf(".") < 0)
176:                    return s;
177:                java.util.StringTokenizer strtok = new java.util.StringTokenizer(
178:                        s, ".");
179:
180:                String scopes[] = new String[strtok.countTokens()];
181:
182:                for (int i = 0; strtok.hasMoreTokens(); i++) {
183:                    String sc = strtok.nextToken();
184:                    if (sc.endsWith("Package"))
185:                        scopes[i] = sc.substring(0, sc.indexOf("Package"));
186:                    else
187:                        scopes[i] = sc;
188:                }
189:
190:                StringBuffer sb = new StringBuffer();
191:                if (scopes.length > 1) {
192:                    for (int i = 0; i < scopes.length - 1; i++)
193:                        sb.append(scopes[i] + "/");
194:                }
195:
196:                sb.append(scopes[scopes.length - 1]);
197:                return sb.toString();
198:            }
199:
200:            /**
201:             * Converts a class name to a Repository ID.
202:             * @param className the class name to convert
203:             * @param resolveClass indicates whether the method should try to
204:             * resolve and load the class. If true and the class could
205:             * not be loaded, an IllegalArgumentException will be thrown
206:             */
207:            public static String toRepositoryID(String className,
208:                    boolean resolveClass, ClassLoader loader) {
209:                if (className.equals("") || className.startsWith("IDL:")
210:                        || className.startsWith("RMI:")) {
211:                    return className;
212:                }
213:
214:                if (resolveClass) {
215:
216:                    Class c = loadClass(className, loader);
217:                    if (c == null) {
218:                        throw new IllegalArgumentException(
219:                                "cannot find class: " + className);
220:                    }
221:                    return repId(c);
222:                }
223:                return "IDL:" + className + ":1.0";
224:            }
225:
226:            public static String toRepositoryID(String className,
227:                    ClassLoader loader) {
228:                return toRepositoryID(className, true, loader);
229:            }
230:
231:            /**
232:             * Loads class `name' using an appropriate class loader.
233:             * Returns the corresponding class object, or null if the class loader
234:             * cannot find a class by that name.
235:             */
236:            private static Class loadClass(String name, ClassLoader loader) {
237:                try {
238:                    if (loader != null) {
239:                        return loader.loadClass(name);
240:                    }
241:                    return org.jacorb.util.ObjectUtil.classForName(name);
242:                } catch (ClassNotFoundException e) {
243:                    return null;
244:                }
245:            }
246:
247:            /**
248:             * Creates a BoxedValueHelper instance for a given repository ID.
249:             * @param repId the repository ID of the boxed value type
250:             * @return a newly created BoxedValueHelper, or null if no
251:             *         BoxedValueHelper class can be found for that ID
252:             * @throws RuntimeException if creation of the Helper instance fails
253:             */
254:            public static BoxedValueHelper createBoxedValueHelper(String repId,
255:                    ClassLoader loader) {
256:                String className = className(repId, "Helper", loader);
257:                Class clazz = loadClass(className, loader);
258:                if (clazz != null) {
259:                    try {
260:                        return (BoxedValueHelper) clazz.newInstance();
261:                    } catch (Exception e) {
262:                        throw new RuntimeException(e);
263:                    }
264:                }
265:                return null;
266:            }
267:        }
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