Source Code Cross Referenced for ParserContext.java in  » Development » jga-Generic-Algorithms » net » sf » jga » parser » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » jga Generic Algorithms » net.sf.jga.parser 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // ============================================================================
002:        // $Id: ParserContext.java,v 1.5 2006/12/16 16:48:57 davidahall Exp $
003:        // Copyright (c) 2005  David A. Hall
004:        // ============================================================================
005:        // The contents of this file are subject to the Common Development and
006:        // Distribution License (CDDL), Version 1.0 (the License); you may not use this 
007:        // file except in compliance with the License.  You should have received a copy
008:        // of the the License along with this file: if not, a copy of the License is 
009:        // available from Sun Microsystems, Inc.
010:        //
011:        // http://www.sun.com/cddl/cddl.html
012:        //
013:        // From time to time, the license steward (initially Sun Microsystems, Inc.) may
014:        // publish revised and/or new versions of the License.  You may not use,  
015:        // distribute, or otherwise make this file available under subsequent versions 
016:        // of the License.
017:        // 
018:        // Alternatively, the contents of this file may be used under the terms of the 
019:        // GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which
020:        // case the provisions of the LGPL are applicable instead of those above. If you 
021:        // wish to allow use of your version of this file only under the terms of the 
022:        // LGPL, and not to allow others to use your version of this file under the 
023:        // terms of the CDDL, indicate your decision by deleting the provisions above 
024:        // and replace them with the notice and other provisions required by the LGPL. 
025:        // If you do not delete the provisions above, a recipient may use your version 
026:        // of this file under the terms of either the CDDL or the LGPL.
027:        // 
028:        // This library is distributed in the hope that it will be useful,
029:        // but WITHOUT ANY WARRANTY; without even the implied warranty of
030:        // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
031:        // ============================================================================
032:
033:        package net.sf.jga.parser;
034:
035:        import java.lang.reflect.Field;
036:        import java.lang.reflect.Method;
037:        import java.lang.reflect.Modifier;
038:        import java.math.BigDecimal;
039:        import java.math.BigInteger;
040:        import java.text.MessageFormat;
041:        import java.util.ArrayList;
042:        import java.util.HashMap;
043:        import java.util.List;
044:        import java.util.Map;
045:        import net.sf.jga.fn.UnaryFunctor;
046:        import net.sf.jga.fn.arithmetic.ValueOf;
047:
048:        /**
049:         * Configuration settings for a JFXGParser.
050:         * <p>
051:         * Copyright &copy; 2005  David A. Hall
052:         */
053:
054:        class ParserContext {
055:            // Maps the argument names to their declared classes (declared to the entry point that
056:            // defines them: the names are bound to the types given to the parseGenerator, parseUnary,
057:            // and parseBinary methods)
058:            private Map<String, Class> _arguments = new HashMap<String, Class>();
059:
060:            // Imported classes, keyed by the classname within the package (or an alias)
061:            private Map<String, Class> _imports = new HashMap<String, Class>();
062:
063:            // Imported packages
064:            private List<String> _packages = new ArrayList<String>();
065:
066:            // Imported static methods, keyed by the method name (or an alias).  Multiple methods
067:            // may be keyed to the same name
068:            private Map<String, List<Method>> _methods = new HashMap<String, List<Method>>();
069:
070:            // Imported static members.
071:            private Map<String, Field> _fields = new HashMap<String, Field>();
072:
073:            // The object to which "this" refers (the parser won't reference itself directly)
074:            private Object _this Obj;
075:
076:            // True if decimal strings without a 'D' or 'F' are to be interpreted as BigDecimal
077:            // constants
078:            private boolean _undecoratedDecimal;
079:
080:            ParserContext() {
081:                initializePromotionRules();
082:            }
083:
084:            /**
085:             * Returns a copy of this context.
086:             */
087:            ParserContext copy() {
088:                ParserContext peer = new ParserContext();
089:                peer._arguments.putAll(_arguments);
090:                peer._imports.putAll(_imports);
091:                peer._methods.putAll(_methods);
092:                peer._fields.putAll(_fields);
093:
094:                peer._packages.addAll(_packages);
095:
096:                peer._this Obj = _this Obj;
097:                peer._undecoratedDecimal = _undecoratedDecimal;
098:
099:                for (Class fromtype : _promotionRules.keySet()) {
100:                    HashMap<Class, UnaryFunctor> ruleset = _promotionRules
101:                            .get(fromtype);
102:                    for (Class totype : ruleset.keySet()) {
103:                        UnaryFunctor fn = ruleset.get(totype);
104:                        peer.addPromotionRule(fromtype, totype, fn);
105:                    }
106:                }
107:
108:                return peer;
109:            }
110:
111:            /**
112:             * Declares a named argument to the functor being built, and its type.
113:             */
114:            public void declareArgument(String argName, Class argType) {
115:                _arguments.put(argName, argType);
116:            }
117:
118:            /**
119:             * Returns the type of the named argument, or null if the name is unrecognized
120:             */
121:            public Class getTypeForName(String name) {
122:                return _arguments.get(name);
123:            }
124:
125:            /**
126:             * Imports the given class into the parser.  The class will not need to be
127:             * fully qualified for use in expressions.  This will replace any existing
128:             * imported class that happens to have the same name.
129:             */
130:            public void importClass(Class clasz) {
131:                importClass(ParserUtils.getSimpleName(clasz), clasz);
132:            }
133:
134:            /**
135:             * Imports the given class into the parser under the given alias.  The alias
136:             * may be used in place of the fully qualified name of the class hereafter.
137:             * This will replace any existing imported class associated with the alias.
138:             */
139:            public void importClass(String alias, Class clasz) {
140:                if (alias != null && clasz != null)
141:                    _imports.put(alias, clasz);
142:            }
143:
144:            /**
145:             * Removes information about the class imported under the given name.
146:             */
147:            public void deportClass(String alias) {
148:                if (alias != null)
149:                    _imports.remove(alias);
150:            }
151:
152:            /**
153:             * Returns the class associated with the given alias
154:             */
155:            public Class getImportedClass(String alias) {
156:                Class klass = _imports.get(alias);
157:                if (klass != null)
158:                    return klass;
159:
160:                List<Class> potentials = new ArrayList<Class>();
161:                for (String pkgName : _packages) {
162:                    try {
163:                        potentials.add(Class.forName(pkgName + "." + alias));
164:                    } catch (Exception x) {
165:                        // There's no way to know that a class exists, other than to try and
166:                        // load it.  Exceptions for flow control are the only option, here.
167:                    }
168:                }
169:
170:                if (potentials.size() == 1) {
171:                    return potentials.get(0);
172:                }
173:
174:                return null;
175:            }
176:
177:            /**
178:             * Imports all classes in the given package into the parser.
179:             */
180:            public void importPackage(String pkgName) {
181:                if (!_packages.contains(pkgName)) {
182:                    _packages.add(pkgName);
183:                }
184:            }
185:
186:            /**
187:             * Removes information about the package imported under the given name.
188:             */
189:            public void deportPackage(String pkgName) {
190:                _packages.remove(pkgName);
191:            }
192:
193:            /**
194:             * Imports all of the static public methods and members in the given class.
195:             */
196:            public void importStatics(Class clasz) {
197:                // First, do the fields
198:                Field[] fields = clasz.getFields();
199:                for (int i = 0; i < fields.length; ++i) {
200:                    if (Modifier.isStatic(fields[i].getModifiers()))
201:                        importField(fields[i]);
202:                }
203:
204:                // next, do the methods
205:                Method[] methods = clasz.getMethods();
206:                for (int i = 0; i < methods.length; ++i) {
207:                    if (Modifier.isStatic(methods[i].getModifiers()))
208:                        importMethod(methods[i]);
209:                }
210:            }
211:
212:            /**
213:             * Imports the given static member.  The member will not need to be qualified
214:             * with its classname for use in expressions.
215:             * @throws java.lang.NoSuchFieldException if the named field does not exist
216:             * @throws java.lang.IllegalArgumentException if the named field is not static
217:             */
218:            public void importField(Class clasz, String name)
219:                    throws NoSuchFieldException {
220:                importField(clasz.getField(name));
221:            }
222:
223:            /**
224:             * Imports the given static member.  The member will not need to be qualified
225:             * with its classname for use in expressions.
226:             * @throws java.lang.IllegalArgumentException if the field is not static
227:             */
228:            public void importField(Field field)
229:                    throws IllegalArgumentException {
230:                if (!Modifier.isStatic(field.getModifiers())) {
231:                    String msg = "Cannot import non-static field {0}";
232:                    throw new IllegalArgumentException(MessageFormat.format(
233:                            msg, new Object[] { field }));
234:                }
235:
236:                _fields.put(field.getName(), field);
237:            }
238:
239:            /**
240:             * Returns the imported field with the given name, or null if no such field has
241:             * been imported.
242:             */
243:            public Field getImportedField(String name) {
244:                return _fields.get(name);
245:            }
246:
247:            /**
248:             * Imports the given static method(s).  
249:             * @throws java.lang.NoSuchMethodException if the named method does not exist, or if
250:             * it/they is/are not static
251:             */
252:            public void importMethod(Class clasz, String name)
253:                    throws NoSuchMethodException {
254:                Method[] methods = clasz.getMethods();
255:                int numImported = 0;
256:                for (int i = 0; i < methods.length; ++i) {
257:                    if (name.equals(methods[i].getName())
258:                            && Modifier.isStatic(methods[i].getModifiers())) {
259:                        importMethod(name, methods[i]);
260:                        ++numImported;
261:                    }
262:                }
263:
264:                if (numImported == 0) {
265:                    String msg = "No non-static method {0} found in class {1}";
266:                    Object[] args = new Object[] { name, clasz.getName() };
267:                    throw new NoSuchMethodException(MessageFormat.format(msg,
268:                            args));
269:                }
270:            }
271:
272:            /**
273:             * Imports a static method into the parser.  The method will not need to be
274:             * qualified with its classname for use in expressions.  Multiple methods
275:             * may be imported with the same name: the first best fit will be used when
276:             * the method name is used.
277:             * @throws java.lang.NoSuchMethodException if the named method does not exist
278:             * @throws java.lang.IllegalArgumentException if the named method is not static
279:             */
280:            public void importMethod(Method meth) {
281:                importMethod(meth.getName(), meth);
282:            }
283:
284:            /**
285:             * Imports a static method into the parser under the given name.  The method
286:             * will not need to be qualified with its classname for use in expressions.
287:             * Multiple methods may be imported with the same name: the first best fit
288:             * will be used when the method name is used.
289:             * @throws java.lang.IllegalArgumentException if the method is not static
290:             */
291:            public void importMethod(String name, Method meth) {
292:                if (!Modifier.isStatic(meth.getModifiers())) {
293:                    String msg = "Cannot import non-static method {0}";
294:                    throw new IllegalArgumentException(MessageFormat.format(
295:                            msg, new Object[] { meth }));
296:                }
297:
298:                List<Method> methodList = _methods.get(name);
299:                if (methodList == null) {
300:                    methodList = new ArrayList<Method>();
301:                    _methods.put(name, methodList);
302:                }
303:                methodList.add(meth);
304:            }
305:
306:            /**
307:             * Returns a list of methods with the given name
308:             */
309:            public Method[] getImportedMethods(String name) {
310:                List<Method> methodList = _methods.get(name);
311:                if (methodList == null)
312:                    return new Method[0];
313:                else
314:                    return methodList.toArray(new Method[0]);
315:            }
316:
317:            /**
318:             * Binds the object to which 'this' refers    
319:             */
320:            public void bindThis(Object this Binding) {
321:                _this Obj = this Binding;
322:            }
323:
324:            /**
325:             * Returns the current object to which 'this' refers
326:             */
327:            protected Object getBoundObject() {
328:                return _this Obj;
329:            }
330:
331:            /**
332:             * Enables/Disables the interpretation of undecorated decimal literals
333:             * as BigDecimals.  When true, an undecorated number containing a
334:             * decimal, for example <tt>1.50</tt> is interpreted as a BigDecimal
335:             * literal.  When false, the same token is interpreted as a Double, as
336:             * is the case in standard java
337:             */
338:            public void setUndecoratedDecimal(boolean flag) {
339:                _undecoratedDecimal = flag;
340:            }
341:
342:            /**
343:             * When true, an undecorated number containing a
344:             * decimal, for example <tt>1.50</tt> is interpreted as a BigDecimal
345:             * literal.  When false, the same token is interpreted as a Double, as
346:             * is the case in standard java
347:             */
348:            public boolean isUndecoratedDecimal() {
349:                return _undecoratedDecimal;
350:            }
351:
352:            /**
353:             * Registers a type-coercion rule that will promote values of the from type to
354:             * values of the to type for use in expressions.
355:             */
356:            public void addPromotionRule(Class fromType, Class toType,
357:                    UnaryFunctor converter) {
358:                HashMap<Class, UnaryFunctor> ruleset = _promotionRules
359:                        .get(fromType);
360:                if (ruleset == null) {
361:                    ruleset = new HashMap<Class, UnaryFunctor>();
362:                    _promotionRules.put(fromType, ruleset);
363:                }
364:
365:                ruleset.put(toType, converter);
366:            }
367:
368:            /**
369:             * Removes the type-coercion rule (if any) that would have promoted values of the
370:             * from type to values of the to type for use in expressions.
371:             */
372:            public void removePromotionRule(Class fromType, Class toType) {
373:                HashMap<Class, UnaryFunctor> ruleset = _promotionRules
374:                        .get(fromType);
375:                if (ruleset != null)
376:                    ruleset.remove(toType);
377:            }
378:
379:            /**
380:             * Returns a type-coercion rule that will promote values of the from type to
381:             * values of the to type for use in expressions, if any such rule exists.
382:             * Returns null if no such rule exists.
383:             */
384:            public UnaryFunctor getPromotionRule(Class fromType, Class toType) {
385:                HashMap<Class, UnaryFunctor> ruleset = _promotionRules
386:                        .get(fromType);
387:                if (ruleset == null)
388:                    return null;
389:
390:                return ruleset.get(toType);
391:            }
392:
393:            private HashMap<Class, HashMap<Class, UnaryFunctor>> _promotionRules = new HashMap();
394:
395:            private UnaryFunctor toShort = new ValueOf(Short.class);
396:
397:            private UnaryFunctor toInteger = new ValueOf(Integer.class);
398:            private UnaryFunctor toLong = new ValueOf(Long.class);
399:            private UnaryFunctor toFloat = new ValueOf(Float.class);
400:            private UnaryFunctor toDouble = new ValueOf(Double.class);
401:            private UnaryFunctor toDecimal = new ValueOf(BigDecimal.class);
402:            private UnaryFunctor toBigInt = new ValueOf(BigInteger.class);
403:
404:            private void initializePromotionRules() {
405:                addPromotionRule(Byte.class, Short.class, toShort);
406:                addPromotionRule(Byte.class, Integer.class, toInteger);
407:                addPromotionRule(Byte.class, Long.class, toLong);
408:                addPromotionRule(Byte.class, BigInteger.class, toBigInt);
409:                addPromotionRule(Byte.class, Double.class, toDouble);
410:                addPromotionRule(Byte.class, Float.class, toFloat);
411:                addPromotionRule(Byte.class, BigDecimal.class, toDecimal);
412:
413:                addPromotionRule(Short.class, Integer.class, toInteger);
414:                addPromotionRule(Short.class, Long.class, toLong);
415:                addPromotionRule(Short.class, BigInteger.class, toBigInt);
416:                addPromotionRule(Short.class, Double.class, toDouble);
417:                addPromotionRule(Short.class, Float.class, toFloat);
418:                addPromotionRule(Short.class, BigDecimal.class, toDecimal);
419:
420:                addPromotionRule(Integer.class, Long.class, toLong);
421:                addPromotionRule(Integer.class, BigInteger.class, toBigInt);
422:                addPromotionRule(Integer.class, Float.class, toFloat);
423:                addPromotionRule(Integer.class, Double.class, toDouble);
424:                addPromotionRule(Integer.class, BigDecimal.class, toDecimal);
425:
426:                addPromotionRule(Long.class, BigInteger.class, toBigInt);
427:                addPromotionRule(Long.class, Float.class, toFloat);
428:                addPromotionRule(Long.class, Double.class, toDouble);
429:                addPromotionRule(Long.class, BigDecimal.class, toDecimal);
430:
431:                addPromotionRule(BigInteger.class, Float.class, toFloat);
432:                addPromotionRule(BigInteger.class, Double.class, toDouble);
433:                addPromotionRule(BigInteger.class, BigDecimal.class, toDecimal);
434:
435:                addPromotionRule(Float.class, Double.class, toDouble);
436:                addPromotionRule(Float.class, BigDecimal.class, toDecimal);
437:
438:                addPromotionRule(Double.class, BigDecimal.class, toDecimal);
439:            }
440:        }
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