net.sf.saxon.ma.json.JsonToXMLFn Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of Saxon-HE Show documentation
The XSLT and XQuery Processor
There is a newer version: 12.5
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2015 Saxonica Limited.
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package net.sf.saxon.ma.json;

import net.sf.saxon.ma.map.HashTrieMap;
import net.sf.saxon.ma.map.MapItem;
import net.sf.saxon.expr.XPathContext;
import net.sf.saxon.functions.SystemFunction;
import net.sf.saxon.om.Item;
import net.sf.saxon.om.Sequence;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.value.EmptySequence;

/**
 * Implements the json-to-xml function defined in XSLT 3.0.
 */

public class JsonToXMLFn extends SystemFunction {

    /**
     * Evaluate the expression
     *
     * @param context   the dynamic evaluation context
     * @param arguments the values of the arguments, supplied as SequenceIterators
     * @return the result of the evaluation, in the form of a SequenceIterator
     * @throws net.sf.saxon.trans.XPathException
     *          if a dynamic error occurs during the evaluation of the expression
     */
    public Sequence call(XPathContext context, Sequence[] arguments) throws XPathException {
        Item arg0 = arguments[0].head();
        if (arg0 == null) {
            return EmptySequence.getInstance();
        }
        String input = arg0.getStringValue();
        MapItem options;
        if (getArity() == 2) {
            options = (MapItem) arguments[1].head();
        } else {
            options = new HashTrieMap(context);
        }
        Item result = eval(input, options, context);
        return result == null ? EmptySequence.getInstance() : result;
    }


    /**
     * Parse the JSON string according to supplied options
     *
     * @param input   JSON input string
     * @param options options for the conversion as a map of xs:string : value pairs
     * @param context XPath evaluation context
     * @return the result of the parsing, as an XML element
     * @throws XPathException if the syntax of the input is incorrect
     */
    protected Item eval(String input, MapItem options, XPathContext context) throws XPathException {
        JsonParser parser = new JsonParser(context.getConfiguration().getValidCharacterChecker());
        options = JsonParser.checkOptions(options, context);
        int flags = JsonParser.getFlags(options, context, true);
        if ((flags & JsonParser.DUPLICATES_LAST) != 0) {
            throw new XPathException("json-to-xml: duplicates=use-last is not allowed", "FOJS0005");
        }
        if ((flags & JsonParser.DUPLICATES_SPECIFIED) == 0) {
            if ((flags & JsonParser.VALIDATE) != 0) {
                flags |= JsonParser.DUPLICATES_REJECTED;
            } else {
                flags |= JsonParser.DUPLICATES_RETAINED;
            }
        }
        JsonHandlerXML handler = new JsonHandlerXML(context, getStaticBaseUriString(), flags);
        handler.setFallbackFunction(options, context);
        parser.parse(input, flags, handler, context);
        return handler.getResult();
    }



}

// Copyright (c) 2011-2014 Saxonica Limited. All rights reserved.