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1: /* CodeSet_sctx.java -- 2: Copyright (C) 2005 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package gnu.CORBA.GIOP; 40: 41: import gnu.CORBA.CDR.AbstractCdrInput; 42: import gnu.CORBA.CDR.AbstractCdrOutput; 43: import gnu.CORBA.IOR; 44: import java.io.IOException; 45: 46: /** 47: * The code set service context. This context must be included in all 48: * messages that use wide characters. 49: * 50: * @author Audrius Meskauskas (AudriusA@Bioinformatics.org) 51: */ 52: public class CodeSetServiceContext 53: extends ServiceContext 54: { 55: /** 56: * The context code sets id. 57: */ 58: public static final int ID = 1; 59: 60: /** 61: * The standard component to include in the messages. 62: */ 63: public static final CodeSetServiceContext STANDARD = new CodeSetServiceContext(); 64: 65: /** 66: * The encoding, used to transfer the narrow (1 byte) character data. 67: * The default value is taken from {@link CharSets_OSF#NATIVE_CHARACTER}. 68: */ 69: public int char_data = CharSets_OSF.NATIVE_CHARACTER; 70: 71: /** 72: * The encoding, used to transfer the wide character data. 73: * The default value is taken from 74: * {@link CharSets_OSF#NATIVE_WIDE_CHARACTER}. 75: */ 76: public int wide_char_data = CharSets_OSF.NATIVE_WIDE_CHARACTER; 77: 78: /** 79: * Find and return the code set service context in the give 80: * contexts array. Returns {@link #STANDARD} if no code set 81: * context is present. 82: * 83: * @param contexts the array of contexts, can be null. 84: */ 85: public static CodeSetServiceContext find(ServiceContext[] contexts) 86: { 87: if (contexts != null) 88: for (int i = 0; i < contexts.length; i++) 89: { 90: if (contexts [ i ] instanceof CodeSetServiceContext) 91: return (CodeSetServiceContext) contexts [ i ]; 92: } 93: return STANDARD; 94: } 95: 96: /** 97: * Select the suitable encoding that is defined in the provided profile. 98: * 99: * TODO character encoding. Now the encoding can be set, but it is ignored. 100: * If you take this task, scan 'TODO character encoding' for 101: * relevant places. 102: */ 103: public static CodeSetServiceContext negotiate(IOR.CodeSets_profile profile) 104: { 105: if (profile.negotiated != null) 106: return profile.negotiated; 107: 108: CodeSetServiceContext use = new CodeSetServiceContext(); 109: 110: use.char_data = 111: negotiate(profile.narrow, STANDARD.char_data, CharSets_OSF.ISO8859_1); 112: 113: use.wide_char_data = 114: negotiate(profile.wide, STANDARD.wide_char_data, CharSets_OSF.UTF16); 115: 116: profile.negotiated = use; 117: 118: return use; 119: } 120: 121: /** 122: * Read the context from the given stream. Does not read the 123: * code sets id. 124: */ 125: public void readContext(AbstractCdrInput input) 126: { 127: AbstractCdrInput encap = input.read_encapsulation(); 128: 129: char_data = encap.read_ulong(); 130: wide_char_data = encap.read_ulong(); 131: } 132: 133: /** 134: * Return a string representation. 135: */ 136: public String toString() 137: { 138: return " Encoding: narrow " + name(char_data) + ", wide " + 139: name(wide_char_data) + ". "; 140: } 141: 142: /** 143: * Write the context to the given stream, including the code 144: * sets id. 145: */ 146: public void write(AbstractCdrOutput output) 147: { 148: output.write_ulong(ID); 149: 150: AbstractCdrOutput enout = output.createEncapsulation(); 151: 152: enout.write_long(char_data); 153: enout.write_ulong(wide_char_data); 154: 155: try 156: { 157: enout.close(); 158: } 159: catch (IOException ex) 160: { 161: InternalError t = new InternalError(); 162: t.initCause(ex); 163: throw t; 164: } 165: } 166: 167: /** 168: * Negotiate about the character encoding. Prefer our native encoding, 169: * if no, prefer IORs native encoding, if no, find any encoding, 170: * supported by both sides, if no, return the specified final decission. 171: * 172: * @param profile the component profile in IOR. 173: * @param our_native our native encoding 174: * @param final_decission the encoding that must be returned if no 175: * compromise is found. 176: * 177: * @return the resulted encoding. 178: */ 179: protected static int negotiate(IOR.CodeSets_profile.CodeSet_component profile, 180: int our_native, int final_decission 181: ) 182: { 183: // If our and IORs native sets match, use the native set. 184: if (profile.native_set == our_native) 185: return our_native; 186: 187: // If the native sets do not match, but the IOR says it 188: // supports our native set, use our native set. 189: if (profile.conversion != null) 190: for (int i = 0; i < profile.conversion.length; i++) 191: { 192: if (our_native == profile.conversion [ i ]) 193: return our_native; 194: } 195: 196: // At this point, we suggest to use the IORs native set. 197: int[] allSupported = CharSets_OSF.getSupportedCharSets(); 198: 199: for (int s = 0; s < allSupported.length; s++) 200: if (allSupported [ s ] == profile.native_set) 201: return profile.native_set; 202: 203: // Any compromise left? 204: if (profile.conversion != null) 205: for (int s = 0; s < allSupported.length; s++) 206: for (int i = 0; i < profile.conversion.length; i++) 207: if (allSupported [ s ] == profile.conversion [ i ]) 208: return allSupported [ s ]; 209: 210: // Return the CORBA default char encoding. 211: return final_decission; 212: } 213: 214: /** 215: * Conveniency method, used in toString() 216: */ 217: private String name(int set) 218: { 219: return "0x" + Integer.toHexString(set) + " (" + CharSets_OSF.getName(set) + 220: ") "; 221: } 222: }