ServiceContextData.java revision 608:7e06bf1dcb09 
1/*
2 * Copyright (c) 1999, 2003, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package com.sun.corba.se.spi.servicecontext;
27
28import org.omg.CORBA.BAD_PARAM ;
29import org.omg.CORBA_2_3.portable.InputStream ;
30import com.sun.corba.se.spi.servicecontext.ServiceContext ;
31import java.lang.reflect.InvocationTargetException ;
32import java.lang.reflect.Modifier ;
33import java.lang.reflect.Field ;
34import java.lang.reflect.Constructor ;
35import com.sun.corba.se.spi.ior.iiop.GIOPVersion;
36import com.sun.corba.se.spi.orb.ORB ;
37import com.sun.corba.se.impl.orbutil.ORBUtility ;
38
39/** Internal class used to hold data about a service context class.
40*/
41public class ServiceContextData {
42    private void dprint( String msg )
43    {
44        ORBUtility.dprint( this, msg ) ;
45    }
46
47    private void throwBadParam( String msg, Throwable exc )
48    {
49        BAD_PARAM error = new BAD_PARAM( msg ) ;
50        if (exc != null)
51            error.initCause( exc ) ;
52        throw error ;
53    }
54
55    public ServiceContextData( Class cls )
56    {
57        if (ORB.ORBInitDebug)
58            dprint( "ServiceContextData constructor called for class " + cls ) ;
59
60        scClass = cls ;
61
62        try {
63            if (ORB.ORBInitDebug)
64                dprint( "Finding constructor for " + cls ) ;
65
66            // Find the appropriate constructor in cls
67            Class[] args = new Class[2] ;
68            args[0] = InputStream.class ;
69            args[1] = GIOPVersion.class;
70            try {
71                scConstructor = cls.getConstructor( args ) ;
72            } catch (NoSuchMethodException nsme) {
73                throwBadParam( "Class does not have an InputStream constructor", nsme ) ;
74            }
75
76            if (ORB.ORBInitDebug)
77                dprint( "Finding SERVICE_CONTEXT_ID field in " + cls ) ;
78
79            // get the ID from the public static final int SERVICE_CONTEXT_ID
80            Field fld = null ;
81            try {
82                fld = cls.getField( "SERVICE_CONTEXT_ID" ) ;
83            } catch (NoSuchFieldException nsfe) {
84                throwBadParam( "Class does not have a SERVICE_CONTEXT_ID member", nsfe ) ;
85            } catch (SecurityException se) {
86                throwBadParam( "Could not access SERVICE_CONTEXT_ID member", se ) ;
87            }
88
89            if (ORB.ORBInitDebug)
90                dprint( "Checking modifiers of SERVICE_CONTEXT_ID field in " + cls ) ;
91
92            int mod = fld.getModifiers() ;
93            if (!Modifier.isPublic(mod) || !Modifier.isStatic(mod) ||
94                !Modifier.isFinal(mod) )
95                throwBadParam( "SERVICE_CONTEXT_ID field is not public static final", null ) ;
96
97            if (ORB.ORBInitDebug)
98                dprint( "Getting value of SERVICE_CONTEXT_ID in " + cls ) ;
99
100            try {
101                scId = fld.getInt( null ) ;
102            } catch (IllegalArgumentException iae) {
103                throwBadParam( "SERVICE_CONTEXT_ID not convertible to int", iae ) ;
104            } catch (IllegalAccessException iae2) {
105                throwBadParam( "Could not access value of SERVICE_CONTEXT_ID", iae2 ) ;
106            }
107        } catch (BAD_PARAM nssc) {
108            if (ORB.ORBInitDebug)
109                dprint( "Exception in ServiceContextData constructor: " + nssc ) ;
110            throw nssc ;
111        } catch (Throwable thr) {
112            if (ORB.ORBInitDebug)
113                dprint( "Unexpected Exception in ServiceContextData constructor: " +
114                        thr ) ;
115        }
116
117        if (ORB.ORBInitDebug)
118            dprint( "ServiceContextData constructor completed" ) ;
119    }
120
121    /** Factory method used to create a ServiceContext object by
122     * unmarshalling it from the InputStream.
123     */
124    public ServiceContext makeServiceContext(InputStream is, GIOPVersion gv)
125    {
126        Object[] args = new Object[2];
127        args[0] = is ;
128        args[1] = gv;
129        ServiceContext sc = null ;
130
131        try {
132            sc = (ServiceContext)(scConstructor.newInstance( args )) ;
133        } catch (IllegalArgumentException iae) {
134            throwBadParam( "InputStream constructor argument error", iae ) ;
135        } catch (IllegalAccessException iae2) {
136            throwBadParam( "InputStream constructor argument error", iae2 ) ;
137        } catch (InstantiationException ie) {
138            throwBadParam( "InputStream constructor called for abstract class", ie ) ;
139        } catch (InvocationTargetException ite) {
140            throwBadParam( "InputStream constructor threw exception " +
141                ite.getTargetException(), ite ) ;
142        }
143
144        return sc ;
145    }
146
147    int getId()
148    {
149        return scId ;
150    }
151
152    public String toString()
153    {
154        return "ServiceContextData[ scClass=" + scClass + " scConstructor=" +
155            scConstructor + " scId=" + scId + " ]" ;
156    }
157
158    private Class       scClass ;
159    private Constructor scConstructor ;
160    private int         scId ;
161}
162