com.prowidesoftware.swift.io.parser.MxNodeContentHandler.java Source code

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Here is the source code for com.prowidesoftware.swift.io.parser.MxNodeContentHandler.java

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/*******************************************************************************
 * Copyright (c) 2016 Prowide Inc.
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Lesser General Public License as 
 *     published by the Free Software Foundation, either version 3 of the 
 *     License, or (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
 *     
 *     Check the LGPL at <http://www.gnu.org/licenses/> for more details.
 *******************************************************************************/
package com.prowidesoftware.swift.io.parser;

import java.util.logging.Level;
import java.util.logging.Logger;

import org.apache.commons.lang.StringUtils;

import com.prowidesoftware.swift.model.MxNode;

/**
 * Non-public content handler used by {@link MxParser} to parse MX message into {@link MxNode} tree
 * <br >
 * Non Namespace Aware. 
 * The namespace uri, if present, is stored as attribute named "xmlns" in the root node.
 */
/*
 * TODO sebastian oct 2015
 * Esto debiera soportar namespaces, ahroa se lo guarda como attr porque se usa para detectar tipo de header.
 */
final class MxNodeContentHandler implements org.xml.sax.ContentHandler {
    private static final transient Logger log = Logger.getLogger(MxNodeContentHandler.class.getName());

    private MxNode currentNode;
    private MxNode rootNode;

    MxNode getRootNode() {
        return this.rootNode;
    }

    public void setDocumentLocator(final org.xml.sax.Locator locator) {
    }

    public void startDocument() throws org.xml.sax.SAXException {
        this.currentNode = null;
    }

    public void endDocument() throws org.xml.sax.SAXException {
    }

    public void startPrefixMapping(final String prefix, final String uri) throws org.xml.sax.SAXException {
    }

    public void endPrefixMapping(final String prefix) throws org.xml.sax.SAXException {
    }

    public void startElement(final String uri, final String localName, final String qName,
            final org.xml.sax.Attributes atts) throws org.xml.sax.SAXException {
        if (log.isLoggable(Level.FINEST)) {
            log.finest("uri: " + uri + "\nlocalName: " + localName + "\nqName: " + qName
                    + (atts == null ? "" : "\natts(" + atts.getLength() + "): ..."));
        }
        final MxNode node = new MxNode(currentNode, localName);
        if (atts != null) {
            for (int i = 0; i < atts.getLength(); i++) {
                node.addAttribute(atts.getLocalName(i), atts.getValue(i));
            }
        }
        /*
         * set uri as xmlns attribute for the first node in namespace
         */
        if (uri != null
                && (node.getParent() == null || !StringUtils.equals(node.getParent().getAttribute("xmlns"), uri))) {
            node.addAttribute("xmlns", uri);
        }
        currentNode = node;
    }

    public void endElement(final String uri, final String localName, final String qName)
            throws org.xml.sax.SAXException {
        log.finest("end: " + localName);
        if (currentNode.getParent() == null) {
            rootNode = currentNode;
        }
        // shouln't overlap
        // TODO merge review
        currentNode = currentNode.getParent();
    }

    public void characters(final char[] ch, final int start, final int length) throws org.xml.sax.SAXException {
        final String v = new String(ch, start, length);
        log.finest("characters: " + v);
        // TODO this may need buffering and be pushed in end element, check with big data and impl specs
        currentNode.setValue(v);
    }

    public void ignorableWhitespace(final char[] ch, final int start, final int length)
            throws org.xml.sax.SAXException {
    }

    public void processingInstruction(final String target, final String data) throws org.xml.sax.SAXException {
        /*
         *  2015.03 miguel
         *  seria muy intersante soportar custom processing instructions aca
         */
    }

    public void skippedEntity(final String name) throws org.xml.sax.SAXException {
        log.finer("skippedEntity: " + name);
    }
}