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• JsonReceiver.java

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

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// 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.event.PipelineConfiguration;
import net.sf.saxon.event.Receiver;
import net.sf.saxon.event.StartTagBuffer;
import net.sf.saxon.expr.parser.Location;
import net.sf.saxon.lib.NamespaceConstant;
import net.sf.saxon.om.NamespaceBinding;
import net.sf.saxon.om.NodeName;
import net.sf.saxon.trans.Err;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.tree.util.FastStringBuffer;
import net.sf.saxon.type.SchemaType;
import net.sf.saxon.type.SimpleType;
import net.sf.saxon.type.StringConverter;
import net.sf.saxon.value.DoubleValue;
import net.sf.saxon.value.StringToDouble11;
import net.sf.saxon.value.Whitespace;
import net.sf.saxon.z.IntPredicate;

import java.util.HashSet;
import java.util.Set;
import java.util.Stack;

/**
 * A Receiver which receives a stream of XML events using the vocabulary defined for the XML representation
 * of JSON in XSLT 3.0, and which generates the corresponding JSON text as a string
 */


public class JsonReceiver implements Receiver {

    private PipelineConfiguration pipe;
    private FastStringBuffer output;
    private FastStringBuffer textBuffer = new FastStringBuffer(128);
    private Stack stack = new Stack();
    private boolean atStart = true;
    private StartTagBuffer startTagBuffer;
    private boolean indenting = false;
    private boolean escaped = false;
    private Stack> keyChecker = new Stack>();

    private static final String ERR_INPUT = "FOJS0006";

    public JsonReceiver(PipelineConfiguration pipe) {
        setPipelineConfiguration(pipe);
    }

    public void setPipelineConfiguration(PipelineConfiguration pipe) {
        this.pipe = pipe;
        startTagBuffer = (StartTagBuffer)pipe.getComponent(StartTagBuffer.class.getName());
    }

    public PipelineConfiguration getPipelineConfiguration() {
        return pipe;
    }

    public void setSystemId(String systemId) {
        // no action
    }

    public void setIndenting(boolean indenting) {
        this.indenting = indenting;
    }

    public boolean isIndenting() {
        return indenting;
    }

    public void open() throws XPathException {
        output = new FastStringBuffer(2048);
    }

    public void startDocument(int properties) throws XPathException {
        if (output == null) {
            output = new FastStringBuffer(2048);
        }
    }

    public void endDocument() throws XPathException {
        // no action
    }

    public void setUnparsedEntity(String name, String systemID, String publicID) throws XPathException {
        // no action
    }

    public void startElement(NodeName elemName, SchemaType typeCode, Location location, int properties) throws XPathException {
        String parent = stack.empty() ? null : stack.peek().getLocalPart();
        boolean inMap = "map".equals(parent);
        stack.push(elemName);
        //started.push(false);
        if (!elemName.hasURI(NamespaceConstant.JSON)) {
            throw new XPathException("xml-to-json: element found in wrong namespace: " +
                elemName.getStructuredQName().getEQName(), ERR_INPUT);
        }
        if (!atStart) {
            output.append(',');
            if (indenting) {
                indent(stack.size());
            }
        }
        if (inMap) {
            if (startTagBuffer == null) {
                startTagBuffer = (StartTagBuffer)pipe.getComponent(StartTagBuffer.class.getName());
            }
            String key = startTagBuffer.getAttribute("", "key");
            boolean added = keyChecker.peek().add(key);
            if (!added) {
                throw new XPathException("xml-to-json: duplicate key value \"" + Err.wrap(key) + "\"", ERR_INPUT);
            }
            if (key == null) {
                throw new XPathException("xml-to-json: Child elements of