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

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Java Source Code / Java Documentation » XML » saxonb » 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.expr.Expression;
004:        import net.sf.saxon.expr.MappingFunction;
005:        import net.sf.saxon.expr.StaticContext;
006:        import net.sf.saxon.expr.XPathContext;
007:        import net.sf.saxon.om.Item;
008:        import net.sf.saxon.trans.XPathException;
009:        import net.sf.saxon.type.Type;
010:        import net.sf.saxon.value.*;
011:
012:        /**
013:         * Implements the XPath number() function. This can also be used as a mapping function
014:         * in a MappingIterator to map a sequence of values to numbers.
015:         */
016:
017:        public class NumberFn extends SystemFunction implements  MappingFunction {
018:
019:            /**
020:             * Simplify and validate.
021:             * This is a pure function so it can be simplified in advance if the arguments are known
022:             */
023:
024:            public Expression simplify(StaticContext env) throws XPathException {
025:                useContextItemAsDefault();
026:                return simplifyArguments(env);
027:            }
028:
029:            /**
030:             * Evaluate in a general context
031:             */
032:
033:            public Item evaluateItem(XPathContext context)
034:                    throws XPathException {
035:                Item arg0 = argument[0].evaluateItem(context);
036:                if (arg0 == null) {
037:                    return DoubleValue.NaN;
038:                }
039:                if (arg0 instanceof  BooleanValue
040:                        || arg0 instanceof  NumericValue) {
041:                    return ((AtomicValue) arg0).convert(Type.DOUBLE, context);
042:                }
043:                CharSequence s = arg0.getStringValueCS();
044:                try {
045:                    return new DoubleValue(Value.stringToNumber(s));
046:                } catch (NumberFormatException e) {
047:                    return DoubleValue.NaN;
048:                }
049:            }
050:
051:            /**
052:             * Static method to perform the same conversion as the number() function. This is different from the
053:             * convert(Type.DOUBLE) in that it produces NaN rather than an error for non-numeric operands.
054:             */
055:
056:            public static DoubleValue convert(AtomicValue value) {
057:                try {
058:                    if (value == null) {
059:                        return DoubleValue.NaN;
060:                    }
061:                    if (value instanceof  BooleanValue
062:                            || value instanceof  NumericValue) {
063:                        return (DoubleValue) value.convert(Type.DOUBLE, null);
064:                    }
065:                    CharSequence s = value.getStringValueCS();
066:                    return new DoubleValue(Value.stringToNumber(s));
067:                } catch (NumberFormatException e) {
068:                    return DoubleValue.NaN;
069:                } catch (XPathException e) {
070:                    return DoubleValue.NaN;
071:                }
072:            }
073:
074:            /**
075:             * Mapping function for use when converting a sequence of atomic values to doubles
076:             * using the rules of the number() function
077:             */
078:
079:            public Object map(Item item, XPathContext context)
080:                    throws XPathException {
081:                return convert((AtomicValue) item);
082:            }
083:        }
084:
085:        //
086:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
087:        // you may not use this file except in compliance with the License. You may obtain a copy of the
088:        // License at http://www.mozilla.org/MPL/
089:        //
090:        // Software distributed under the License is distributed on an "AS IS" basis,
091:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
092:        // See the License for the specific language governing rights and limitations under the License.
093:        //
094:        // The Original Code is: all this file.
095:        //
096:        // The Initial Developer of the Original Code is Michael H. Kay.
097:        //
098:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
099:        //
100:        // Contributor(s): none.
101:        //
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