Source Code Cross Referenced for Unicode.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.XPathContext;
004:        import net.sf.saxon.expr.Expression;
005:        import net.sf.saxon.expr.StaticContext;
006:        import net.sf.saxon.om.*;
007:        import net.sf.saxon.trans.DynamicError;
008:        import net.sf.saxon.trans.XPathException;
009:        import net.sf.saxon.value.NumericValue;
010:        import net.sf.saxon.value.StringValue;
011:
012:        /**
013:         * This class supports the two functions string-to-codepoints() and codepoints-to-string()
014:         */
015:
016:        public class Unicode extends SystemFunction {
017:
018:            public static final int TO_CODEPOINTS = 0;
019:            public static final int FROM_CODEPOINTS = 1;
020:
021:            /**
022:             * Pre-evaluate a function at compile time. Functions that do not allow
023:             * pre-evaluation, or that need access to context information, can override this method.
024:             */
025:
026:            public Expression preEvaluate(StaticContext env)
027:                    throws XPathException {
028:                switch (operation) {
029:                case TO_CODEPOINTS:
030:                    return super .preEvaluate(env);
031:                case FROM_CODEPOINTS:
032:                    final XPathContext context = env
033:                            .makeEarlyEvaluationContext();
034:                    return StringValue.makeStringValue(unicodeToString(
035:                            argument[0].iterate(context), context));
036:                default:
037:                    throw new UnsupportedOperationException(
038:                            "Unknown Unicode operation");
039:                }
040:            }
041:
042:            /**
043:             * Evaluate
044:             */
045:
046:            public Item evaluateItem(XPathContext c) throws XPathException {
047:                switch (operation) {
048:                case TO_CODEPOINTS:
049:                    throw new UnsupportedOperationException(
050:                            "Cannot call evaluateItem on a sequence");
051:                case FROM_CODEPOINTS:
052:                    return StringValue.makeStringValue(unicodeToString(
053:                            argument[0].iterate(c), c));
054:                default:
055:                    throw new UnsupportedOperationException(
056:                            "Unknown Unicode operation");
057:                }
058:            }
059:
060:            public SequenceIterator iterate(XPathContext c)
061:                    throws XPathException {
062:                switch (operation) {
063:                case TO_CODEPOINTS:
064:                    Item item = argument[0].evaluateItem(c);
065:                    if (item == null) {
066:                        return EmptyIterator.getInstance();
067:                    }
068:                    return stringToUnicode(item.getStringValueCS());
069:                case FROM_CODEPOINTS:
070:                    return SingletonIterator.makeIterator(evaluateItem(c));
071:                default:
072:                    throw new UnsupportedOperationException(
073:                            "Unknown Unicode operation");
074:                }
075:            }
076:
077:            /**
078:             * Return a sequence of integers representing the Unicode code values of the characters in a given
079:             * string.
080:             */
081:
082:            private static SequenceIterator stringToUnicode(CharSequence s) {
083:                return StringValue.makeStringValue(s).iterateCharacters();
084:            }
085:
086:            /**
087:             * Return the Unicode string corresponding to a given sequence of Unicode code values
088:             * @param chars iterator delivering the characters as integer values
089:             * @param context the evaluation context
090:             * @throws XPathException if any of the integers is not the codepoint of a valid XML character
091:             */
092:
093:            private static CharSequence unicodeToString(SequenceIterator chars,
094:                    XPathContext context) throws XPathException {
095:                FastStringBuffer sb = new FastStringBuffer(256);
096:                NameChecker checker = context.getConfiguration()
097:                        .getNameChecker();
098:                while (true) {
099:                    NumericValue nextInt = (NumericValue) chars.next();
100:                    if (nextInt == null) {
101:                        return sb.condense();
102:                    }
103:                    long next = nextInt.longValue();
104:                    if (next < 0 || next > Integer.MAX_VALUE
105:                            || !checker.isValidChar((int) next)) {
106:                        DynamicError e = new DynamicError(
107:                                "Invalid XML character [x "
108:                                        + Integer.toHexString((int) next) + ']');
109:                        e.setErrorCode("FOCH0001");
110:                        if (context instanceof  XPathContext) {
111:                            e.setXPathContext((XPathContext) context);
112:                        }
113:                        throw e;
114:                    }
115:                    if (next < 65536) {
116:                        sb.append((char) next);
117:                    } else { // output a surrogate pair
118:                        sb.append(XMLChar.highSurrogate((int) next));
119:                        sb.append(XMLChar.lowSurrogate((int) next));
120:                    }
121:                }
122:            }
123:
124:        }
125:
126:        //
127:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
128:        // you may not use this file except in compliance with the License. You may obtain a copy of the
129:        // License at http://www.mozilla.org/MPL/
130:        //
131:        // Software distributed under the License is distributed on an "AS IS" basis,
132:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
133:        // See the License for the specific language governing rights and limitations under the License.
134:        //
135:        // The Original Code is: all this file.
136:        //
137:        // The Initial Developer of the Original Code is Michael H. Kay.
138:        //
139:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
140:        //
141:        // Contributor(s): none.
142:        //
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