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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 gnu.CORBA.IOR.CodeSets_profile; 45: 46: import java.io.IOException; 47: 48: /** 49: * The code set service context. This context must be included in all 50: * messages that use wide characters. 51: * 52: * @author Audrius Meskauskas (AudriusA@Bioinformatics.org) 53: */ 54: public class CodeSetServiceContext 55: extends ServiceContext 56: { 57: /** 58: * The context code sets id. 59: */ 60: public static final int ID = 1; 61: 62: /** 63: * The standard component to include in the messages. 64: */ 65: public static final CodeSetServiceContext STANDARD = new CodeSetServiceContext(); 66: 67: /** 68: * The encoding, used to transfer the narrow (1 byte) character data. 69: * The default value is taken from {@link CharSets_OSF#NATIVE_CHARACTER}. 70: */ 71: public int char_data = CharSets_OSF.NATIVE_CHARACTER; 72: 73: /** 74: * The encoding, used to transfer the wide character data. 75: * The default value is taken from 76: * {@link CharSets_OSF#NATIVE_WIDE_CHARACTER}. 77: */ 78: public int wide_char_data = CharSets_OSF.NATIVE_WIDE_CHARACTER; 79: 80: /** 81: * Find and return the code set service context in the give 82: * contexts array. Returns {@link #STANDARD} if no code set 83: * context is present. 84: * 85: * @param contexts the array of contexts, can be null. 86: */ 87: public static CodeSetServiceContext find(ServiceContext[] contexts) 88: { 89: if (contexts != null) 90: for (int i = 0; i < contexts.length; i++) 91: { 92: if (contexts [ i ] instanceof CodeSetServiceContext) 93: return (CodeSetServiceContext) contexts [ i ]; 94: } 95: return STANDARD; 96: } 97: 98: /** 99: * Select the suitable encoding that is defined in the provided profile. 100: * 101: * TODO character encoding. Now the encoding can be set, but it is ignored. 102: * If you take this task, scan 'TODO character encoding' for 103: * relevant places. 104: */ 105: public static CodeSetServiceContext negotiate(IOR.CodeSets_profile profile) 106: { 107: if (profile.negotiated != null) 108: return profile.negotiated; 109: 110: CodeSetServiceContext use = new CodeSetServiceContext(); 111: 112: use.char_data = 113: negotiate(profile.narrow, STANDARD.char_data, CharSets_OSF.ISO8859_1); 114: 115: use.wide_char_data = 116: negotiate(profile.wide, STANDARD.wide_char_data, CharSets_OSF.UTF16); 117: 118: profile.negotiated = use; 119: 120: return use; 121: } 122: 123: /** 124: * Read the context from the given stream. Does not read the 125: * code sets id. 126: */ 127: public void readContext(AbstractCdrInput input) 128: { 129: AbstractCdrInput encap = input.read_encapsulation(); 130: 131: char_data = encap.read_ulong(); 132: wide_char_data = encap.read_ulong(); 133: } 134: 135: /** 136: * Return a string representation. 137: */ 138: public String toString() 139: { 140: return " Encoding: narrow " + name(char_data) + ", wide " + 141: name(wide_char_data) + ". "; 142: } 143: 144: /** 145: * Write the context to the given stream, including the code 146: * sets id. 147: */ 148: public void write(AbstractCdrOutput output) 149: { 150: output.write_ulong(ID); 151: 152: AbstractCdrOutput enout = output.createEncapsulation(); 153: 154: enout.write_long(char_data); 155: enout.write_ulong(wide_char_data); 156: 157: try 158: { 159: enout.close(); 160: } 161: catch (IOException ex) 162: { 163: InternalError t = new InternalError(); 164: t.initCause(ex); 165: throw t; 166: } 167: } 168: 169: /** 170: * Negotiate about the character encoding. Prefer our native encoding, 171: * if no, prefer IORs native encoding, if no, find any encoding, 172: * supported by both sides, if no, return the specified final decission. 173: * 174: * @param profile the component profile in IOR. 175: * @param our_native our native encoding 176: * @param final_decission the encoding that must be returned if no 177: * compromise is found. 178: * 179: * @return the resulted encoding. 180: */ 181: protected static int negotiate(IOR.CodeSets_profile.CodeSet_component profile, 182: int our_native, int final_decission 183: ) 184: { 185: // If our and IORs native sets match, use the native set. 186: if (profile.native_set == our_native) 187: return our_native; 188: 189: // If the native sets do not match, but the IOR says it 190: // supports our native set, use our native set. 191: if (profile.conversion != null) 192: for (int i = 0; i < profile.conversion.length; i++) 193: { 194: if (our_native == profile.conversion [ i ]) 195: return our_native; 196: } 197: 198: // At this point, we suggest to use the IORs native set. 199: int[] allSupported = CharSets_OSF.getSupportedCharSets(); 200: 201: for (int s = 0; s < allSupported.length; s++) 202: if (allSupported [ s ] == profile.native_set) 203: return profile.native_set; 204: 205: // Any compromise left? 206: if (profile.conversion != null) 207: for (int s = 0; s < allSupported.length; s++) 208: for (int i = 0; i < profile.conversion.length; i++) 209: if (allSupported [ s ] == profile.conversion [ i ]) 210: return allSupported [ s ]; 211: 212: // Return the CORBA default char encoding. 213: return final_decission; 214: } 215: 216: /** 217: * Conveniency method, used in toString() 218: */ 219: private String name(int set) 220: { 221: return "0x" + Integer.toHexString(set) + " (" + CharSets_OSF.getName(set) + 222: ") "; 223: } 224: }