ExtensibleXMLEditorPageContent.java

// ============================================================================
//
// Copyright (C) 2006-2016 Talend Inc. - www.talend.com
//
// This source code is available under agreement available at
// %InstallDIR%\features\org.talend.rcp.branding.%PRODUCTNAME%\%PRODUCTNAME%license.txt
//
// You should have received a copy of the agreement
// along with this program; if not, write to Talend SA
// 9 rue Pages 92150 Suresnes, France
//
// ============================================================================
package com.amalto.workbench.widgets.xmleditor.pagecontent;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Node;
import org.dom4j.dom.DOMDocumentFactory;

import com.amalto.workbench.utils.XmlUtil;

public abstract class ExtensibleXMLEditorPageContent {

    public ExtensibleXMLEditorPageContent() {
        initToDefault();
    }

    public void init(String xmlExrepssion) {

        InputStream inStream = null;

        try {
            inStream = new ByteArrayInputStream(xmlExrepssion.getBytes());
            initByXMLExpression(XmlUtil.parse(inStream));
        } catch (Exception e) {
            initToDefault();
        } finally {

            if (inStream != null) {
                try {
                    inStream.close();
                } catch (IOException e) {

                }
            }
        }

    }

    public String toXMLExpression() {

        Document xmlDoc = DOMDocumentFactory.getInstance().createDocument();

        fillXMLDoc(xmlDoc);

        try {
            return XmlUtil.formatPretty(XmlUtil.toXml(xmlDoc), "UTF-8");//$NON-NLS-1$
        } catch (DocumentException e) {
            return "";//$NON-NLS-1$
        }
    }

    protected String getSingleValueByPath(Node parent, String relativePath, String valueForNull) {

        if (parent == null) {
            return valueForNull;
        }

        Node node = parent.selectSingleNode("./" + relativePath);//$NON-NLS-1$

        if (node == null) {
            return valueForNull;
        }

        return node.getText();
    }

    protected List<?> getXMLNodesByPath(Node parent, String relativePath) {

        return parent.selectNodes("./" + relativePath);//$NON-NLS-1$
    }

    protected String getPathRelativeToRoot(String tagName) {
        return getRootElementName() + "/" + tagName;//$NON-NLS-1$
    }

    protected abstract String getRootElementName();

    protected abstract void fillXMLDoc(Node parent);

    protected abstract void initToDefault();

    protected abstract void initByXMLExpression(Node parent);

}