DocumentFacadeImpl.java

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package com.arcle.rmt.j2se.model.domimpl;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.apache.xml.serialize.OutputFormat;
import org.apache.xml.serialize.XMLSerializer;
import org.apache.xml.serialize.LineSeparator;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.DOMException;

import java.io.File;
import java.io.FileWriter;
import java.io.FileReader;
import java.io.IOException;

import com.arcle.rmt.j2se.model.RQMLDocument;
import com.arcle.rmt.j2se.model.RQMLDocumentFacade;
import com.arcle.rmt.j2se.model.RQMLDocumentFacadeException;

public class DocumentFacadeImpl extends RQMLDocumentFacade {

    public DocumentFacadeImpl() {
        try {
            documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        } catch(Exception e) {
            e.printStackTrace();
            throw new IllegalStateException("Cannot create DOM document builder.");
        }
    }

    public synchronized RQMLDocument createRQMLDocument()
            throws RQMLDocumentFacadeException {
        RQMLDocument impl = null;
        try {
            Document dom = documentBuilder.newDocument();
            Element element = dom.createElement("rqml");
            dom.appendChild(element);
            impl = createDocument(dom.getDocumentElement());
        } catch(Exception e) {
            rethrowException(e);
        }
        return impl;
    }


    public synchronized RQMLDocument openDocument(File rqmlDocument)
            throws RQMLDocumentFacadeException {
        RQMLDocument doc = null;
        try {
            Document dom = documentBuilder.parse(rqmlDocument);
            doc = createDocument(dom.getDocumentElement());
        } catch(Exception e) {
            rethrowException(e);
        }
        return doc;
    }

    public synchronized void saveDocument(RQMLDocument doc, File docFile)
            throws RQMLDocumentFacadeException {
        try {
            Document dom = getDOMDocument(doc);

            // serialize
            OutputFormat format = new OutputFormat((Document) dom);
            format.setIndenting(true);
            format.setLineWidth(0);
            format.setPreserveSpace(true);
            XMLSerializer serializer = new XMLSerializer (
                new FileWriter(docFile), format);
            serializer.asDOMSerializer();
            serializer.serialize(dom);
        } catch(Exception e) {
            rethrowException(e);
        }
    }


    protected RQMLDocument createDocument(Element dom) {
        return new DocumentImpl(dom);
    }

    protected org.w3c.dom.Document getDOMDocument(RQMLDocument doc) {
        return ((DocumentImpl) doc).getRootElement().getOwnerDocument();
    }

    protected DocumentBuilder documentBuilder;
}

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