Source Code Cross Referenced for SingletonAtomizer.java in  » XML » saxonb » net » sf » saxon » expr » Java Source Code / Java DocumentationJava Source Code and Java Documentation

Java Source Code / Java Documentation
1. 6.0 JDK Core
2. 6.0 JDK Modules
3. 6.0 JDK Modules com.sun
4. 6.0 JDK Modules com.sun.java
5. 6.0 JDK Modules sun
6. 6.0 JDK Platform
7. Ajax
8. Apache Harmony Java SE
9. Aspect oriented
10. Authentication Authorization
11. Blogger System
12. Build
13. Byte Code
14. Cache
15. Chart
16. Chat
17. Code Analyzer
18. Collaboration
19. Content Management System
20. Database Client
21. Database DBMS
22. Database JDBC Connection Pool
23. Database ORM
24. Development
25. EJB Server geronimo
26. EJB Server GlassFish
27. EJB Server JBoss 4.2.1
28. EJB Server resin 3.1.5
29. ERP CRM Financial
30. ESB
31. Forum
32. GIS
33. Graphic Library
34. Groupware
35. HTML Parser
36. IDE
37. IDE Eclipse
38. IDE Netbeans
39. Installer
40. Internationalization Localization
41. Inversion of Control
42. Issue Tracking
43. J2EE
44. JBoss
45. JMS
46. JMX
47. Library
48. Mail Clients
49. Net
50. Parser
51. PDF
52. Portal
53. Profiler
54. Project Management
55. Report
56. RSS RDF
57. Rule Engine
58. Science
59. Scripting
60. Search Engine
61. Security
62. Sevlet Container
63. Source Control
64. Swing Library
65. Template Engine
66. Test Coverage
67. Testing
68. UML
69. Web Crawler
70. Web Framework
71. Web Mail
72. Web Server
73. Web Services
74. Web Services apache cxf 2.0.1
75. Web Services AXIS2
76. Wiki Engine
77. Workflow Engines
78. XML
79. XML UI
Java
Java Tutorial
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
ASP.NET Tutorial
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
SQL / MySQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
Java Source Code / Java Documentation » XML » saxonb » net.sf.saxon.expr 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.expr;
002:
003:        import net.sf.saxon.om.Item;
004:        import net.sf.saxon.om.NamePool;
005:        import net.sf.saxon.om.NodeInfo;
006:        import net.sf.saxon.om.SequenceIterator;
007:        import net.sf.saxon.pattern.NoNodeTest;
008:        import net.sf.saxon.pattern.NodeTest;
009:        import net.sf.saxon.trans.XPathException;
010:        import net.sf.saxon.type.*;
011:        import net.sf.saxon.value.AtomicValue;
012:        import net.sf.saxon.value.EmptySequence;
013:        import net.sf.saxon.value.Value;
014:        import net.sf.saxon.instruct.Executable;
015:        import net.sf.saxon.Configuration;
016:
017:        /**
018:         * A SingletonAtomizer combines the functions of an Atomizer and a CardinalityChecker: it is used to
019:         * atomize a sequence of nodes, checking that the result of the atomization contains zero or one atomic
020:         * values. Note that the input may be a sequence of nodes or atomic values, even though the result must
021:         * contain at most one atomic value.
022:         */
023:
024:        public final class SingletonAtomizer extends UnaryExpression {
025:
026:            private boolean allowEmpty;
027:            private RoleLocator role;
028:
029:            /**
030:             * Constructor
031:             * @param sequence the sequence to be atomized
032:             * @param allowEmpty true if the result sequence is allowed to be empty.
033:             */
034:
035:            public SingletonAtomizer(Expression sequence, RoleLocator role,
036:                    boolean allowEmpty) {
037:                super (sequence);
038:                this .allowEmpty = allowEmpty;
039:                this .role = role;
040:            }
041:
042:            /**
043:             * Simplify an expression
044:             */
045:
046:            public Expression simplify(StaticContext env) throws XPathException {
047:                operand = operand.simplify(env);
048:                if (operand instanceof  AtomicValue) {
049:                    return operand;
050:                }
051:                return this ;
052:            }
053:
054:            /**
055:             * Type-check the expression
056:             */
057:
058:            public Expression typeCheck(StaticContext env,
059:                    ItemType contextItemType) throws XPathException {
060:                operand = operand.typeCheck(env, contextItemType);
061:                resetStaticProperties();
062:                if (operand instanceof  EmptySequence) {
063:                    if (!allowEmpty) {
064:                        typeError("An empty sequence is not allowed as the "
065:                                + role.getMessage(), role.getErrorCode(), null);
066:                    }
067:                    return operand;
068:                }
069:                final TypeHierarchy th = env.getNamePool().getTypeHierarchy();
070:                if (operand.getItemType(th).isAtomicType()) {
071:                    return operand;
072:                }
073:                return this ;
074:            }
075:
076:            /**
077:             * Determine the special properties of this expression
078:             * @return {@link StaticProperty#NON_CREATIVE}.
079:             */
080:
081:            public int computeSpecialProperties() {
082:                int p = super .computeSpecialProperties();
083:                return p | StaticProperty.NON_CREATIVE;
084:            }
085:
086:            /**
087:             * Evaluate as an Item. This should only be called if the Atomizer has cardinality zero-or-one,
088:             * which will only be the case if the underlying expression has cardinality zero-or-one.
089:             */
090:
091:            public Item evaluateItem(XPathContext context)
092:                    throws XPathException {
093:                int found = 0;
094:                Item result = null;
095:                SequenceIterator iter = operand.iterate(context);
096:                while (true) {
097:                    Item item = iter.next();
098:                    if (item == null) {
099:                        break;
100:                    }
101:                    if (item instanceof  AtomicValue) {
102:                        if (found++ > 0) {
103:                            typeError(
104:                                    "A sequence of more than one item is not allowed as the "
105:                                            + role.getMessage(), role
106:                                            .getErrorCode(), context);
107:                        }
108:                        result = item;
109:                    } else {
110:                        Value value = ((NodeInfo) item).atomize();
111:                        found += value.getLength();
112:                        if (found > 1) {
113:                            typeError(
114:                                    "A sequence of more than one item is not allowed as the "
115:                                            + role.getMessage(), role
116:                                            .getErrorCode(), context);
117:                        }
118:                        result = value.itemAt(0);
119:                    }
120:                }
121:                if (found == 0 && !allowEmpty) {
122:                    typeError("An empty sequence is not allowed as the "
123:                            + role.getMessage(), role.getErrorCode(), null);
124:                }
125:                return result;
126:            }
127:
128:            /**
129:             * Determine the data type of the items returned by the expression, if possible
130:             * @return a value such as Type.STRING, Type.BOOLEAN, Type.NUMBER. For this class, the
131:             * result is always an atomic type, but it might be more specific.
132:             * @param th
133:             */
134:
135:            public ItemType getItemType(TypeHierarchy th) {
136:                boolean isSchemaAware = true;
137:                Executable exec = getExecutable();
138:                if (exec != null
139:                        && !exec.getConfiguration().isSchemaAware(
140:                                Configuration.XML_SCHEMA)) {
141:                    isSchemaAware = false;
142:                }
143:                ItemType in = operand.getItemType(th);
144:                if (in instanceof  AtomicType) {
145:                    return in;
146:                }
147:                if (in instanceof  NodeTest) {
148:
149:                    if (in instanceof  NoNodeTest) {
150:                        return in;
151:                    }
152:
153:                    int kinds = ((NodeTest) in).getNodeKindMask();
154:                    if (!isSchemaAware) {
155:                        // Some node-kinds always have a typed value that's a string
156:
157:                        if ((kinds | STRING_KINDS) == STRING_KINDS) {
158:                            return Type.STRING_TYPE;
159:                        }
160:                        // Some node-kinds are always untyped atomic; some are untypedAtomic provided that the configuration
161:                        // is untyped
162:
163:                        if ((kinds | UNTYPED_IF_UNTYPED_KINDS) == UNTYPED_IF_UNTYPED_KINDS) {
164:                            return Type.UNTYPED_ATOMIC_TYPE;
165:                        }
166:                    } else {
167:                        if ((kinds | UNTYPED_KINDS) == UNTYPED_KINDS) {
168:                            return Type.UNTYPED_ATOMIC_TYPE;
169:                        }
170:                    }
171:
172:                    SchemaType schemaType = ((NodeTest) in).getContentType();
173:                    if (schemaType instanceof  SimpleType) {
174:                        return ((SimpleType) schemaType).getCommonAtomicType();
175:                    } else if (((ComplexType) schemaType).isSimpleContent()) {
176:                        return ((ComplexType) schemaType)
177:                                .getSimpleContentType().getCommonAtomicType();
178:                    } else if (schemaType instanceof  AnyType) {
179:                        // AnyType includes AnySimpleType as a subtype, so the atomized value can be any atomic type
180:                        // including untypedAtomic
181:                        return Type.ANY_ATOMIC_TYPE;
182:                    } else {
183:                        // if a complex type with complex content (other than AnyType) can be atomized at all,
184:                        // then it will return untypedAtomic values
185:                        return Type.UNTYPED_ATOMIC_TYPE;
186:                    }
187:                }
188:                return Type.ANY_ATOMIC_TYPE;
189:            }
190:
191:            /**
192:             * Node kinds whose typed value is always a string
193:             */
194:            private static final int STRING_KINDS = (1 << Type.NAMESPACE)
195:                    | (1 << Type.COMMENT) | (1 << Type.PROCESSING_INSTRUCTION);
196:
197:            /**
198:             * Node kinds whose typed value is always untypedAtomic
199:             */
200:
201:            private static final int UNTYPED_KINDS = (1 << Type.TEXT)
202:                    | (1 << Type.DOCUMENT);
203:
204:            /**
205:             * Node kinds whose typed value is untypedAtomic if the configuration is untyped
206:             */
207:
208:            private static final int UNTYPED_IF_UNTYPED_KINDS = (1 << Type.TEXT)
209:                    | (1 << Type.ELEMENT)
210:                    | (1 << Type.DOCUMENT)
211:                    | (1 << Type.ATTRIBUTE);
212:
213:            /**
214:             * Determine the static cardinality of the expression
215:             */
216:
217:            public int computeCardinality() {
218:                if (allowEmpty) {
219:                    return StaticProperty.ALLOWS_ZERO_OR_ONE;
220:                } else {
221:                    return StaticProperty.EXACTLY_ONE;
222:                }
223:            }
224:
225:            /**
226:             * Give a string representation of the operator for use in diagnostics
227:             * @return the operator, as a string
228:             */
229:
230:            protected String displayOperator(NamePool pool) {
231:                return "atomize singleton";
232:            }
233:
234:        }
235:
236:        //
237:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
238:        // you may not use this file except in compliance with the License. You may obtain a copy of the
239:        // License at http://www.mozilla.org/MPL/
240:        //
241:        // Software distributed under the License is distributed on an "AS IS" basis,
242:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
243:        // See the License for the specific language governing rights and limitations under the License.
244:        //
245:        // The Original Code is: all this file.
246:        //
247:        // The Initial Developer of the Original Code is Michael H. Kay
248:        //
249:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
250:        //
251:        // Contributor(s): none.
252:        //
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.