Source Code Cross Referenced for DeepEqual.java in  » XML » XPath-Saxon » net » sf » saxon » functions » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » XPath Saxon » net.sf.saxon.functions 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.functions;
002:
003:        import net.sf.saxon.Configuration;
004:        import net.sf.saxon.expr.Expression;
005:        import net.sf.saxon.expr.StaticContext;
006:        import net.sf.saxon.expr.XPathContext;
007:        import net.sf.saxon.om.*;
008:        import net.sf.saxon.pattern.NameTest;
009:        import net.sf.saxon.sort.AtomicComparer;
010:        import net.sf.saxon.sort.IntHashSet;
011:        import net.sf.saxon.trans.XPathException;
012:        import net.sf.saxon.trans.DynamicError;
013:        import net.sf.saxon.type.ComplexType;
014:        import net.sf.saxon.type.SchemaType;
015:        import net.sf.saxon.type.Type;
016:        import net.sf.saxon.value.BooleanValue;
017:        import net.sf.saxon.value.Whitespace;
018:
019:        import javax.xml.transform.TransformerException;
020:
021:        /**
022:         * XSLT 2.0 deep-equal() function.
023:         * Supports deep comparison of two sequences (of nodes and/or atomic values)
024:         * optionally using a collation
025:         */
026:
027:        public class DeepEqual extends CollatingFunction {
028:
029:            /**
030:             * Flag indicating that two elements should only be considered equal if they have the same
031:             * in-scope namespaces
032:             */
033:            public static final int INCLUDE_NAMESPACES = 1 << 0;
034:
035:            /**
036:             * Flag indicating that comment children are taken into account when comparing element or document nodes
037:             */
038:            public static final int INCLUDE_COMMENTS = 1 << 2;
039:
040:            /**
041:             * Flag indicating that processing instruction nodes are taken into account when comparing element or document nodes
042:             */
043:            public static final int INCLUDE_PROCESSING_INSTRUCTIONS = 1 << 3;
044:
045:            /**
046:             * Flag indicating that whitespace text nodes are ignored when comparing element nodes
047:             */
048:            public static final int EXCLUDE_WHITESPACE_TEXT_NODES = 1 << 4;
049:
050:            /**
051:             * Flag indicating that elements and attributes should always be compared according to their string
052:             * value, not their typed value
053:             */
054:            public static final int COMPARE_STRING_VALUES = 1 << 5;
055:
056:            /**
057:             * Flag indicating that elements and attributes must have the same type annotation to be considered
058:             * deep-equal
059:             */
060:            public static final int COMPARE_ANNOTATIONS = 1 << 6;
061:
062:            /**
063:             * Flag indicating that a warning message explaining the reason why the sequences were deemed non-equal
064:             * should be sent to the ErrorListener
065:             */
066:            public static final int WARNING_IF_FALSE = 1 << 7;
067:
068:            private transient Configuration config = null;
069:
070:            /**
071:             * preEvaluate: if all arguments are known statically, evaluate early
072:             */
073:
074:            public Expression preEvaluate(StaticContext env)
075:                    throws XPathException {
076:                config = env.getConfiguration();
077:                return super .preEvaluate(env);
078:            }
079:
080:            /**
081:             * Evaluate the expression
082:             */
083:
084:            public Item evaluateItem(XPathContext context)
085:                    throws XPathException {
086:                AtomicComparer collator = getAtomicComparer(2, context);
087:
088:                SequenceIterator op1 = argument[0].iterate(context);
089:                SequenceIterator op2 = argument[1].iterate(context);
090:
091:                Configuration config = (this .config != null ? this .config
092:                        : context.getConfiguration());
093:                return BooleanValue.get(deepEquals(op1, op2, collator, config,
094:                        0));
095:            }
096:
097:            /**
098:             * Determine when two sequences are deep-equal
099:             * @param op1 the first sequence
100:             * @param op2 the second sequence
101:             * @param collator the collator to be used
102:             * @param config the configuration (gives access to the NamePool)
103:             * @param flags bit-significant integer giving comparison options. Always zero for standard
104:             * F+O deep-equals comparison.
105:             * @return true if the sequences are deep-equal
106:             */
107:
108:            public static boolean deepEquals(SequenceIterator op1,
109:                    SequenceIterator op2, AtomicComparer collator,
110:                    Configuration config, int flags) {
111:                boolean result = true;
112:                String reason = null;
113:                try {
114:                    while (true) {
115:                        Item item1 = op1.next();
116:                        Item item2 = op2.next();
117:
118:                        if (item1 == null && item2 == null) {
119:                            break;
120:                        }
121:
122:                        if (item1 == null || item2 == null) {
123:                            result = false;
124:                            reason = "sequences have different lengths";
125:                            break;
126:                        }
127:
128:                        if (item1 instanceof  NodeInfo) {
129:                            if (item2 instanceof  NodeInfo) {
130:                                if (!deepEquals((NodeInfo) item1,
131:                                        (NodeInfo) item2, collator, config,
132:                                        flags)) {
133:                                    result = false;
134:                                    reason = "nodes at position "
135:                                            + op1.position() + " differ";
136:                                    break;
137:                                }
138:                            } else {
139:                                result = false;
140:                                reason = "comparing a node to an atomic value at position "
141:                                        + op1.position();
142:                                break;
143:                            }
144:                        } else {
145:                            if (item2 instanceof  NodeInfo) {
146:                                result = false;
147:                                reason = "comparing an atomic value to a node at position "
148:                                        + op1.position();
149:                                break;
150:                            } else {
151:                                if (!collator.comparesEqual(item1, item2)) {
152:                                    result = false;
153:                                    reason = "atomic values at position "
154:                                            + op1.position() + " differ";
155:                                    break;
156:                                }
157:                            }
158:                        }
159:                    } // end while
160:
161:                } catch (ClassCastException err) {
162:                    // this will happen if the sequences contain non-comparable values
163:                    // comparison errors are masked
164:                    result = false;
165:                    reason = "sequences contain non-comparable values";
166:                } catch (XPathException err) {
167:                    // comparison errors are masked
168:                    result = false;
169:                    reason = "error occurred while comparing two values ("
170:                            + err.getMessage() + ')';
171:                }
172:
173:                if (!result) {
174:                    explain(config, reason, flags);
175:                    //                config.getErrorListener().warning(
176:                    //                        new DynamicError("deep-equal(): " + reason)
177:                    //                );
178:                }
179:
180:                return result;
181:            }
182:
183:            /**
184:             * Determine whether two nodes are deep-equal
185:             */
186:
187:            private static boolean deepEquals(NodeInfo n1, NodeInfo n2,
188:                    AtomicComparer collator, Configuration config, int flags)
189:                    throws XPathException {
190:                // shortcut: a node is always deep-equal to itself
191:                if (n1.isSameNodeInfo(n2))
192:                    return true;
193:
194:                if (n1.getNodeKind() != n2.getNodeKind()) {
195:                    explain(config, "node kinds differ: comparing "
196:                            + Type.displayTypeName(n1) + " to "
197:                            + Type.displayTypeName(n2), flags);
198:                    return false;
199:                }
200:
201:                final NamePool pool = config.getNamePool();
202:                switch (n1.getNodeKind()) {
203:                case Type.ELEMENT:
204:                    if (n1.getFingerprint() != n2.getFingerprint()) {
205:                        explain(config, "element names differ: "
206:                                + config.getNamePool().getClarkName(
207:                                        n1.getFingerprint())
208:                                + " != "
209:                                + config.getNamePool().getClarkName(
210:                                        n2.getFingerprint()), flags);
211:                        return false;
212:                    }
213:                    AxisIterator a1 = n1.iterateAxis(Axis.ATTRIBUTE);
214:                    AxisIterator a2 = n2.iterateAxis(Axis.ATTRIBUTE);
215:                    if (Aggregate.count(a1.getAnother()) != Aggregate.count(a2)) {
216:                        explain(config,
217:                                "elements have different number of attributes",
218:                                flags);
219:                        return false;
220:                    }
221:                    while (true) {
222:                        NodeInfo att1 = (NodeInfo) a1.next();
223:                        if (att1 == null)
224:                            break;
225:
226:                        AxisIterator a2iter = n2.iterateAxis(Axis.ATTRIBUTE,
227:                                new NameTest(Type.ATTRIBUTE, att1
228:                                        .getFingerprint(), pool));
229:                        NodeInfo att2 = (NodeInfo) a2iter.next();
230:
231:                        if (att2 == null) {
232:                            explain(config, "one element has an attribute "
233:                                    + config.getNamePool().getClarkName(
234:                                            att1.getFingerprint())
235:                                    + ", the other does not", flags);
236:                            return false;
237:                        }
238:                        if (!deepEquals(att1, att2, collator, config, flags)) {
239:                            explain(
240:                                    config,
241:                                    "elements have different values for the attribute "
242:                                            + config
243:                                                    .getNamePool()
244:                                                    .getClarkName(
245:                                                            att1
246:                                                                    .getFingerprint()),
247:                                    flags);
248:                            return false;
249:                        }
250:                    }
251:                    if ((flags & INCLUDE_NAMESPACES) != 0) {
252:                        IntHashSet ns1 = new IntHashSet(10);
253:                        IntHashSet ns2 = new IntHashSet(10);
254:                        AxisIterator it1 = n1.iterateAxis(Axis.NAMESPACE);
255:                        while (true) {
256:                            NodeInfo nn1 = (NodeInfo) it1.next();
257:                            if (nn1 == null) {
258:                                break;
259:                            }
260:                            int nscode1 = pool.getNamespaceCode(nn1
261:                                    .getLocalPart(), nn1.getStringValue());
262:                            ns1.add(nscode1);
263:                        }
264:                        AxisIterator it2 = n2.iterateAxis(Axis.NAMESPACE);
265:                        while (true) {
266:                            NodeInfo nn2 = (NodeInfo) it2.next();
267:                            if (nn2 == null) {
268:                                break;
269:                            }
270:                            int nscode2 = pool.getNamespaceCode(nn2
271:                                    .getLocalPart(), nn2.getStringValue());
272:                            ns2.add(nscode2);
273:                        }
274:                        if (!ns1.equals(ns2)) {
275:                            explain(
276:                                    config,
277:                                    "elements have different in-scope namespaces",
278:                                    flags);
279:                            return false;
280:                        }
281:                    }
282:
283:                    if ((flags & COMPARE_ANNOTATIONS) != 0) {
284:                        if (n1.getTypeAnnotation() != n2.getTypeAnnotation()) {
285:                            explain(config,
286:                                    "elements have different type annotation",
287:                                    flags);
288:                            return false;
289:                        }
290:                    }
291:
292:                    if ((flags & COMPARE_STRING_VALUES) == 0) {
293:                        final int ann1 = n1.getTypeAnnotation();
294:                        final int ann2 = n2.getTypeAnnotation();
295:                        final SchemaType type1 = config.getSchemaType(ann1);
296:                        final SchemaType type2 = config.getSchemaType(ann2);
297:                        final boolean isSimple1 = type1.isSimpleType()
298:                                || ((ComplexType) type1).isSimpleContent();
299:                        final boolean isSimple2 = type2.isSimpleType()
300:                                || ((ComplexType) type2).isSimpleContent();
301:                        if (isSimple1 != isSimple2) {
302:                            explain(
303:                                    config,
304:                                    "one element has a simple type, the other does not",
305:                                    flags);
306:                            return false;
307:                        }
308:                        if (isSimple1 && isSimple2) {
309:                            final SequenceIterator v1 = n1.getTypedValue();
310:                            final SequenceIterator v2 = n2.getTypedValue();
311:                            return deepEquals(v1, v2, collator, config, flags);
312:                        }
313:                    }
314:                    // fall through
315:                case Type.DOCUMENT:
316:                    AxisIterator c1 = n1.iterateAxis(Axis.CHILD);
317:                    AxisIterator c2 = n2.iterateAxis(Axis.CHILD);
318:                    while (true) {
319:                        NodeInfo d1 = (NodeInfo) c1.next();
320:                        while (d1 != null && isIgnorable(d1, flags)) {
321:                            d1 = (NodeInfo) c1.next();
322:                        }
323:                        NodeInfo d2 = (NodeInfo) c2.next();
324:                        while (d2 != null && isIgnorable(d2, flags)) {
325:                            d2 = (NodeInfo) c2.next();
326:                        }
327:                        if (d1 == null || d2 == null) {
328:                            boolean r = (d1 == d2);
329:                            if (!r) {
330:                                explain(
331:                                        config,
332:                                        "nodes have different numbers of children",
333:                                        flags);
334:                            }
335:                            return r;
336:                        }
337:                        if (!deepEquals(d1, d2, collator, config, flags)) {
338:                            return false;
339:                        }
340:                    }
341:
342:                case Type.ATTRIBUTE:
343:                    if (n1.getFingerprint() != n2.getFingerprint()) {
344:                        explain(config, "attribute names differ: "
345:                                + config.getNamePool().getClarkName(
346:                                        n1.getFingerprint())
347:                                + " != "
348:                                + config.getNamePool().getClarkName(
349:                                        n2.getFingerprint()), flags);
350:                        return false;
351:                    }
352:                    if ((flags & COMPARE_ANNOTATIONS) != 0) {
353:                        if (n1.getTypeAnnotation() != n2.getTypeAnnotation()) {
354:                            explain(
355:                                    config,
356:                                    "attributes have different type annotations",
357:                                    flags);
358:                            return false;
359:                        }
360:                    }
361:                    boolean ar;
362:                    if ((flags & COMPARE_STRING_VALUES) == 0) {
363:                        ar = deepEquals(n1.getTypedValue(), n2.getTypedValue(),
364:                                collator, config, 0);
365:                    } else {
366:                        ar = collator.compare(n1.getStringValue(), n2
367:                                .getStringValue()) == 0;
368:                    }
369:                    if (!ar) {
370:                        explain(config, "attribute values differ", flags);
371:                    }
372:                    return ar;
373:
374:                case Type.PROCESSING_INSTRUCTION:
375:                case Type.NAMESPACE:
376:                    if (n1.getFingerprint() != n2.getFingerprint()) {
377:                        explain(config, Type.displayTypeName(n1)
378:                                + " names differ", flags);
379:                        return false;
380:                    }
381:                    // drop through
382:                case Type.TEXT:
383:                case Type.COMMENT:
384:                    boolean vr = (collator.comparesEqual(n1.getStringValue(),
385:                            n2.getStringValue()));
386:                    if (!vr) {
387:                        explain(config, Type.displayTypeName(n1)
388:                                + " values differ", flags);
389:                    }
390:                    return vr;
391:
392:                default:
393:                    throw new IllegalArgumentException("Unknown node type");
394:                }
395:            }
396:
397:            private static boolean isIgnorable(NodeInfo node, int flags) {
398:                final int kind = node.getNodeKind();
399:                if (kind == Type.COMMENT) {
400:                    return (flags & INCLUDE_COMMENTS) == 0;
401:                } else if (kind == Type.PROCESSING_INSTRUCTION) {
402:                    return (flags & INCLUDE_PROCESSING_INSTRUCTIONS) == 0;
403:                } else if (kind == Type.TEXT) {
404:                    return ((flags & EXCLUDE_WHITESPACE_TEXT_NODES) != 0)
405:                            && Whitespace.isWhite(node.getStringValueCS());
406:                }
407:                return false;
408:            }
409:
410:            private static void explain(Configuration config, String message,
411:                    int flags) {
412:                try {
413:                    if ((flags & WARNING_IF_FALSE) != 0) {
414:                        config.getErrorListener().warning(
415:                                new DynamicError("deep-equal(): " + message));
416:                    }
417:                } catch (TransformerException e) {
418:                    //
419:                }
420:            }
421:
422:        }
423:
424:        //
425:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
426:        // you may not use this file except in compliance with the License. You may obtain a copy of the
427:        // License at http://www.mozilla.org/MPL/
428:        //
429:        // Software distributed under the License is distributed on an "AS IS" basis,
430:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
431:        // See the License for the specific language governing rights and limitations under the License.
432:        //
433:        // The Original Code is: all this file.
434:        //
435:        // The Initial Developer of the Original Code is Michael Kay
436:        //
437:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
438:        //
439:        // Contributor(s): none.
440:        //
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