1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 /* 19 * $Id: FunctionTable.java 468655 2006-10-28 07:12:06Z minchau $ 20 */ 21 package org.apache.xpath.compiler; 22 23 import org.apache.xpath.Expression; 24 import org.apache.xpath.functions.Function; 25 import java.util.HashMap; 26 import javax.xml.transform.TransformerException; 27 28 /** 29 * The function table for XPath. 30 */ 31 public class FunctionTable 32 { 33 34 /** The 'current()' id. */ 35 public static final int FUNC_CURRENT = 0; 36 37 /** The 'last()' id. */ 38 public static final int FUNC_LAST = 1; 39 40 /** The 'position()' id. */ 41 public static final int FUNC_POSITION = 2; 42 43 /** The 'count()' id. */ 44 public static final int FUNC_COUNT = 3; 45 46 /** The 'id()' id. */ 47 public static final int FUNC_ID = 4; 48 49 /** The 'key()' id (XSLT). */ 50 public static final int FUNC_KEY = 5; 51 52 /** The 'local-name()' id. */ 53 public static final int FUNC_LOCAL_PART = 7; 54 55 /** The 'namespace-uri()' id. */ 56 public static final int FUNC_NAMESPACE = 8; 57 58 /** The 'name()' id. */ 59 public static final int FUNC_QNAME = 9; 60 61 /** The 'generate-id()' id. */ 62 public static final int FUNC_GENERATE_ID = 10; 63 64 /** The 'not()' id. */ 65 public static final int FUNC_NOT = 11; 66 67 /** The 'true()' id. */ 68 public static final int FUNC_TRUE = 12; 69 70 /** The 'false()' id. */ 71 public static final int FUNC_FALSE = 13; 72 73 /** The 'boolean()' id. */ 74 public static final int FUNC_BOOLEAN = 14; 75 76 /** The 'number()' id. */ 77 public static final int FUNC_NUMBER = 15; 78 79 /** The 'floor()' id. */ 80 public static final int FUNC_FLOOR = 16; 81 82 /** The 'ceiling()' id. */ 83 public static final int FUNC_CEILING = 17; 84 85 /** The 'round()' id. */ 86 public static final int FUNC_ROUND = 18; 87 88 /** The 'sum()' id. */ 89 public static final int FUNC_SUM = 19; 90 91 /** The 'string()' id. */ 92 public static final int FUNC_STRING = 20; 93 94 /** The 'starts-with()' id. */ 95 public static final int FUNC_STARTS_WITH = 21; 96 97 /** The 'contains()' id. */ 98 public static final int FUNC_CONTAINS = 22; 99 100 /** The 'substring-before()' id. */ 101 public static final int FUNC_SUBSTRING_BEFORE = 23; 102 103 /** The 'substring-after()' id. */ 104 public static final int FUNC_SUBSTRING_AFTER = 24; 105 106 /** The 'normalize-space()' id. */ 107 public static final int FUNC_NORMALIZE_SPACE = 25; 108 109 /** The 'translate()' id. */ 110 public static final int FUNC_TRANSLATE = 26; 111 112 /** The 'concat()' id. */ 113 public static final int FUNC_CONCAT = 27; 114 115 /** The 'substring()' id. */ 116 public static final int FUNC_SUBSTRING = 29; 117 118 /** The 'string-length()' id. */ 119 public static final int FUNC_STRING_LENGTH = 30; 120 121 /** The 'system-property()' id. */ 122 public static final int FUNC_SYSTEM_PROPERTY = 31; 123 124 /** The 'lang()' id. */ 125 public static final int FUNC_LANG = 32; 126 127 /** The 'function-available()' id (XSLT). */ 128 public static final int FUNC_EXT_FUNCTION_AVAILABLE = 33; 129 130 /** The 'element-available()' id (XSLT). */ 131 public static final int FUNC_EXT_ELEM_AVAILABLE = 34; 132 133 /** The 'unparsed-entity-uri()' id (XSLT). */ 134 public static final int FUNC_UNPARSED_ENTITY_URI = 36; 135 136 // Proprietary 137 138 /** The 'document-location()' id (Proprietary). */ 139 public static final int FUNC_DOCLOCATION = 35; 140 141 /** 142 * The function table. 143 */ 144 private static Class m_functions[]; 145 146 /** Table of function name to function ID associations. */ 147 private static HashMap m_functionID = new HashMap(); 148 149 /** 150 * The function table contains customized functions 151 */ 152 private Class m_functions_customer[] = new Class[NUM_ALLOWABLE_ADDINS]; 153 154 /** 155 * Table of function name to function ID associations for customized functions 156 */ 157 private HashMap m_functionID_customer = new HashMap(); 158 159 /** 160 * Number of built in functions. Be sure to update this as 161 * built-in functions are added. 162 */ 163 private static final int NUM_BUILT_IN_FUNCS = 37; 164 165 /** 166 * Number of built-in functions that may be added. 167 */ 168 private static final int NUM_ALLOWABLE_ADDINS = 30; 169 170 /** 171 * The index to the next free function index. 172 */ 173 private int m_funcNextFreeIndex = NUM_BUILT_IN_FUNCS; 174 175 static 176 { 177 m_functions = new Class[NUM_BUILT_IN_FUNCS]; 178 m_functions[FUNC_CURRENT] = org.apache.xpath.functions.FuncCurrent.class; 179 m_functions[FUNC_LAST] = org.apache.xpath.functions.FuncLast.class; 180 m_functions[FUNC_POSITION] = org.apache.xpath.functions.FuncPosition.class; 181 m_functions[FUNC_COUNT] = org.apache.xpath.functions.FuncCount.class; 182 m_functions[FUNC_ID] = org.apache.xpath.functions.FuncId.class; 183 m_functions[FUNC_KEY] = 184 org.apache.xalan.templates.FuncKey.class; 185 m_functions[FUNC_LOCAL_PART] = 186 org.apache.xpath.functions.FuncLocalPart.class; 187 m_functions[FUNC_NAMESPACE] = 188 org.apache.xpath.functions.FuncNamespace.class; 189 m_functions[FUNC_QNAME] = org.apache.xpath.functions.FuncQname.class; 190 m_functions[FUNC_GENERATE_ID] = 191 org.apache.xpath.functions.FuncGenerateId.class; 192 m_functions[FUNC_NOT] = org.apache.xpath.functions.FuncNot.class; 193 m_functions[FUNC_TRUE] = org.apache.xpath.functions.FuncTrue.class; 194 m_functions[FUNC_FALSE] = org.apache.xpath.functions.FuncFalse.class; 195 m_functions[FUNC_BOOLEAN] = org.apache.xpath.functions.FuncBoolean.class; 196 m_functions[FUNC_LANG] = org.apache.xpath.functions.FuncLang.class; 197 m_functions[FUNC_NUMBER] = org.apache.xpath.functions.FuncNumber.class; 198 m_functions[FUNC_FLOOR] = org.apache.xpath.functions.FuncFloor.class; 199 m_functions[FUNC_CEILING] = org.apache.xpath.functions.FuncCeiling.class; 200 m_functions[FUNC_ROUND] = org.apache.xpath.functions.FuncRound.class; 201 m_functions[FUNC_SUM] = org.apache.xpath.functions.FuncSum.class; 202 m_functions[FUNC_STRING] = org.apache.xpath.functions.FuncString.class; 203 m_functions[FUNC_STARTS_WITH] = 204 org.apache.xpath.functions.FuncStartsWith.class; 205 m_functions[FUNC_CONTAINS] = org.apache.xpath.functions.FuncContains.class; 206 m_functions[FUNC_SUBSTRING_BEFORE] = 207 org.apache.xpath.functions.FuncSubstringBefore.class; 208 m_functions[FUNC_SUBSTRING_AFTER] = 209 org.apache.xpath.functions.FuncSubstringAfter.class; 210 m_functions[FUNC_NORMALIZE_SPACE] = 211 org.apache.xpath.functions.FuncNormalizeSpace.class; 212 m_functions[FUNC_TRANSLATE] = 213 org.apache.xpath.functions.FuncTranslate.class; 214 m_functions[FUNC_CONCAT] = org.apache.xpath.functions.FuncConcat.class; 215 m_functions[FUNC_SYSTEM_PROPERTY] = 216 org.apache.xpath.functions.FuncSystemProperty.class; 217 m_functions[FUNC_EXT_FUNCTION_AVAILABLE] = 218 org.apache.xpath.functions.FuncExtFunctionAvailable.class; 219 m_functions[FUNC_EXT_ELEM_AVAILABLE] = 220 org.apache.xpath.functions.FuncExtElementAvailable.class; 221 m_functions[FUNC_SUBSTRING] = 222 org.apache.xpath.functions.FuncSubstring.class; 223 m_functions[FUNC_STRING_LENGTH] = 224 org.apache.xpath.functions.FuncStringLength.class; 225 m_functions[FUNC_DOCLOCATION] = 226 org.apache.xpath.functions.FuncDoclocation.class; 227 m_functions[FUNC_UNPARSED_ENTITY_URI] = 228 org.apache.xpath.functions.FuncUnparsedEntityURI.class; 229 } 230 231 static{ 232 m_functionID.put(Keywords.FUNC_CURRENT_STRING, 233 new Integer(FunctionTable.FUNC_CURRENT)); 234 m_functionID.put(Keywords.FUNC_LAST_STRING, 235 new Integer(FunctionTable.FUNC_LAST)); 236 m_functionID.put(Keywords.FUNC_POSITION_STRING, 237 new Integer(FunctionTable.FUNC_POSITION)); 238 m_functionID.put(Keywords.FUNC_COUNT_STRING, 239 new Integer(FunctionTable.FUNC_COUNT)); 240 m_functionID.put(Keywords.FUNC_ID_STRING, 241 new Integer(FunctionTable.FUNC_ID)); 242 m_functionID.put(Keywords.FUNC_KEY_STRING, 243 new Integer(FunctionTable.FUNC_KEY)); 244 m_functionID.put(Keywords.FUNC_LOCAL_PART_STRING, 245 new Integer(FunctionTable.FUNC_LOCAL_PART)); 246 m_functionID.put(Keywords.FUNC_NAMESPACE_STRING, 247 new Integer(FunctionTable.FUNC_NAMESPACE)); 248 m_functionID.put(Keywords.FUNC_NAME_STRING, 249 new Integer(FunctionTable.FUNC_QNAME)); 250 m_functionID.put(Keywords.FUNC_GENERATE_ID_STRING, 251 new Integer(FunctionTable.FUNC_GENERATE_ID)); 252 m_functionID.put(Keywords.FUNC_NOT_STRING, 253 new Integer(FunctionTable.FUNC_NOT)); 254 m_functionID.put(Keywords.FUNC_TRUE_STRING, 255 new Integer(FunctionTable.FUNC_TRUE)); 256 m_functionID.put(Keywords.FUNC_FALSE_STRING, 257 new Integer(FunctionTable.FUNC_FALSE)); 258 m_functionID.put(Keywords.FUNC_BOOLEAN_STRING, 259 new Integer(FunctionTable.FUNC_BOOLEAN)); 260 m_functionID.put(Keywords.FUNC_LANG_STRING, 261 new Integer(FunctionTable.FUNC_LANG)); 262 m_functionID.put(Keywords.FUNC_NUMBER_STRING, 263 new Integer(FunctionTable.FUNC_NUMBER)); 264 m_functionID.put(Keywords.FUNC_FLOOR_STRING, 265 new Integer(FunctionTable.FUNC_FLOOR)); 266 m_functionID.put(Keywords.FUNC_CEILING_STRING, 267 new Integer(FunctionTable.FUNC_CEILING)); 268 m_functionID.put(Keywords.FUNC_ROUND_STRING, 269 new Integer(FunctionTable.FUNC_ROUND)); 270 m_functionID.put(Keywords.FUNC_SUM_STRING, 271 new Integer(FunctionTable.FUNC_SUM)); 272 m_functionID.put(Keywords.FUNC_STRING_STRING, 273 new Integer(FunctionTable.FUNC_STRING)); 274 m_functionID.put(Keywords.FUNC_STARTS_WITH_STRING, 275 new Integer(FunctionTable.FUNC_STARTS_WITH)); 276 m_functionID.put(Keywords.FUNC_CONTAINS_STRING, 277 new Integer(FunctionTable.FUNC_CONTAINS)); 278 m_functionID.put(Keywords.FUNC_SUBSTRING_BEFORE_STRING, 279 new Integer(FunctionTable.FUNC_SUBSTRING_BEFORE)); 280 m_functionID.put(Keywords.FUNC_SUBSTRING_AFTER_STRING, 281 new Integer(FunctionTable.FUNC_SUBSTRING_AFTER)); 282 m_functionID.put(Keywords.FUNC_NORMALIZE_SPACE_STRING, 283 new Integer(FunctionTable.FUNC_NORMALIZE_SPACE)); 284 m_functionID.put(Keywords.FUNC_TRANSLATE_STRING, 285 new Integer(FunctionTable.FUNC_TRANSLATE)); 286 m_functionID.put(Keywords.FUNC_CONCAT_STRING, 287 new Integer(FunctionTable.FUNC_CONCAT)); 288 m_functionID.put(Keywords.FUNC_SYSTEM_PROPERTY_STRING, 289 new Integer(FunctionTable.FUNC_SYSTEM_PROPERTY)); 290 m_functionID.put(Keywords.FUNC_EXT_FUNCTION_AVAILABLE_STRING, 291 new Integer(FunctionTable.FUNC_EXT_FUNCTION_AVAILABLE)); 292 m_functionID.put(Keywords.FUNC_EXT_ELEM_AVAILABLE_STRING, 293 new Integer(FunctionTable.FUNC_EXT_ELEM_AVAILABLE)); 294 m_functionID.put(Keywords.FUNC_SUBSTRING_STRING, 295 new Integer(FunctionTable.FUNC_SUBSTRING)); 296 m_functionID.put(Keywords.FUNC_STRING_LENGTH_STRING, 297 new Integer(FunctionTable.FUNC_STRING_LENGTH)); 298 m_functionID.put(Keywords.FUNC_UNPARSED_ENTITY_URI_STRING, 299 new Integer(FunctionTable.FUNC_UNPARSED_ENTITY_URI)); 300 m_functionID.put(Keywords.FUNC_DOCLOCATION_STRING, 301 new Integer(FunctionTable.FUNC_DOCLOCATION)); 302 } 303 304 public FunctionTable(){ 305 } 306 307 /** 308 * Return the name of the a function in the static table. Needed to avoid 309 * making the table publicly available. 310 */ 311 String getFunctionName(int funcID) { 312 if (funcID < NUM_BUILT_IN_FUNCS) return m_functions[funcID].getName(); 313 else return m_functions_customer[funcID - NUM_BUILT_IN_FUNCS].getName(); 314 } 315 316 /** 317 * Obtain a new Function object from a function ID. 318 * 319 * @param which The function ID, which may correspond to one of the FUNC_XXX 320 * values found in {@link org.apache.xpath.compiler.FunctionTable}, but may 321 * be a value installed by an external module. 322 * 323 * @return a a new Function instance. 324 * 325 * @throws javax.xml.transform.TransformerException if ClassNotFoundException, 326 * IllegalAccessException, or InstantiationException is thrown. 327 */ 328 Function getFunction(int which) 329 throws javax.xml.transform.TransformerException 330 { 331 try{ 332 if (which < NUM_BUILT_IN_FUNCS) 333 return (Function) m_functions[which].newInstance(); 334 else 335 return (Function) m_functions_customer[ 336 which-NUM_BUILT_IN_FUNCS].newInstance(); 337 }catch (IllegalAccessException ex){ 338 throw new TransformerException(ex.getMessage()); 339 }catch (InstantiationException ex){ 340 throw new TransformerException(ex.getMessage()); 341 } 342 } 343 344 /** 345 * Obtain a function ID from a given function name 346 * @param key the function name in a java.lang.String format. 347 * @return a function ID, which may correspond to one of the FUNC_XXX values 348 * found in {@link org.apache.xpath.compiler.FunctionTable}, but may be a 349 * value installed by an external module. 350 */ 351 Object getFunctionID(String key){ 352 Object id = m_functionID_customer.get(key); 353 if (null == id) id = m_functionID.get(key); 354 return id; 355 } 356 357 /** 358 * Install a built-in function. 359 * @param name The unqualified name of the function, must not be null 360 * @param func A Implementation of an XPath Function object. 361 * @return the position of the function in the internal index. 362 */ 363 public int installFunction(String name, Class func) 364 { 365 366 int funcIndex; 367 Object funcIndexObj = getFunctionID(name); 368 369 if (null != funcIndexObj) 370 { 371 funcIndex = ((Integer) funcIndexObj).intValue(); 372 373 if (funcIndex < NUM_BUILT_IN_FUNCS){ 374 funcIndex = m_funcNextFreeIndex++; 375 m_functionID_customer.put(name, new Integer(funcIndex)); 376 } 377 m_functions_customer[funcIndex - NUM_BUILT_IN_FUNCS] = func; 378 } 379 else 380 { 381 funcIndex = m_funcNextFreeIndex++; 382 383 m_functions_customer[funcIndex-NUM_BUILT_IN_FUNCS] = func; 384 385 m_functionID_customer.put(name, 386 new Integer(funcIndex)); 387 } 388 return funcIndex; 389 } 390 391 /** 392 * Tell if a built-in, non-namespaced function is available. 393 * 394 * @param methName The local name of the function. 395 * 396 * @return True if the function can be executed. 397 */ 398 public boolean functionAvailable(String methName) 399 { 400 Object tblEntry = m_functionID.get(methName); 401 if (null != tblEntry) return true; 402 else{ 403 tblEntry = m_functionID_customer.get(methName); 404 return (null != tblEntry)? true : false; 405 } 406 } 407 } 408
