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

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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.SequenceIterator;
006:        import net.sf.saxon.trans.DynamicError;
007:        import net.sf.saxon.trans.XPathException;
008:        import net.sf.saxon.type.AnyItemType;
009:        import net.sf.saxon.type.ItemType;
010:        import net.sf.saxon.type.TypeHierarchy;
011:
012:        import java.io.PrintStream;
013:
014:        /**
015:         * Error expression: this expression is generated when the supplied expression cannot be
016:         * parsed, and the containing element enables forwards-compatible processing. It defers
017:         * the generation of an error message until an attempt is made to evaluate the expression
018:         */
019:
020:        public class ErrorExpression extends ComputedExpression {
021:
022:            private XPathException exception; // the error found when parsing this expression
023:
024:            /**
025:             * Constructor
026:             * @param exception the error found when parsing this expression
027:             */
028:
029:            public ErrorExpression(XPathException exception) {
030:                this .exception = exception;
031:                exception.setLocator(this ); // to remove any links to the compile-time stylesheet objects
032:            };
033:
034:            /**
035:             * Type-check the expression.
036:             */
037:
038:            public Expression typeCheck(StaticContext env,
039:                    ItemType contextItemType) throws XPathException {
040:                return this ;
041:            }
042:
043:            public Expression optimize(Optimizer opt, StaticContext env,
044:                    ItemType contextItemType) throws XPathException {
045:                return this ;
046:            }
047:
048:            /**
049:             * Evaluate the expression. This always throws the exception registered when the expression
050:             * was first parsed.
051:             */
052:
053:            public Item evaluateItem(XPathContext context)
054:                    throws XPathException {
055:                // copy the exception for thread-safety, because we want to add context information
056:                DynamicError err = new DynamicError(exception.getMessage());
057:                err.setLocator(ExpressionTool.getLocator(this ));
058:                err.setErrorCode(exception.getErrorCodeLocalPart());
059:                err.setXPathContext(context);
060:                throw err;
061:            }
062:
063:            /**
064:             * Iterate over the expression. This always throws the exception registered when the expression
065:             * was first parsed.
066:             */
067:
068:            public SequenceIterator iterate(XPathContext context)
069:                    throws XPathException {
070:                evaluateItem(context);
071:                return null; // to fool the compiler
072:            }
073:
074:            /**
075:             * Determine the data type of the expression, if possible
076:             * @return Type.ITEM (meaning not known in advance)
077:             * @param th
078:             */
079:
080:            public ItemType getItemType(TypeHierarchy th) {
081:                return AnyItemType.getInstance();
082:            }
083:
084:            /**
085:             * Determine the static cardinality
086:             */
087:
088:            public int computeCardinality() {
089:                return StaticProperty.ALLOWS_ZERO_OR_MORE;
090:                // we return a liberal value, so that we never get a type error reported
091:                // statically
092:            }
093:
094:            /**
095:             * Diagnostic print of expression structure
096:             */
097:
098:            public void display(int level, NamePool pool, PrintStream out) {
099:                out.println(ExpressionTool.indent(level) + "**ERROR** ("
100:                        + exception.getMessage() + ')');
101:            }
102:
103:        }
104:
105:        //
106:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
107:        // you may not use this file except in compliance with the License. You may obtain a copy of the
108:        // License at http://www.mozilla.org/MPL/
109:        //
110:        // Software distributed under the License is distributed on an "AS IS" basis,
111:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
112:        // See the License for the specific language governing rights and limitations under the License.
113:        //
114:        // The Original Code is: all this file.
115:        //
116:        // The Initial Developer of the Original Code is Michael H. Kay.
117:        //
118:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
119:        //
120:        // Contributor(s): none.
121:        //
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