com.cladonia.xngreditor.actions.ToolsRemoveNodeAction.java Source code

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Here is the source code for com.cladonia.xngreditor.actions.ToolsRemoveNodeAction.java

Source

/*
 * $Id: ToolsRemoveNodeAction.java,v 1.10 2005/03/10 10:54:47 tcurley Exp $ 
 *
 * Copyright (C) 2004, Cladonia Ltd. All rights reserved.
 *
 * This software is the proprietary information of Cladonia Ltd.  
 * Use is subject to license terms.
 */
package com.cladonia.xngreditor.actions;

import java.awt.event.ActionEvent;
import java.util.Vector;

import javax.swing.AbstractAction;
import javax.swing.SwingUtilities;

import org.dom4j.Node;

import com.cladonia.xngreditor.ExchangerEditor;
import com.cladonia.xml.ExchangerDocument;
import com.cladonia.xml.editor.Editor;
import com.cladonia.xngreditor.MessageHandler;
import com.cladonia.xngreditor.properties.ConfigurationProperties;
import com.cladonia.xngreditor.ToolsRemoveNodeDialog;

/**
 * An action that can be used to Remove Node By XPath
 *
 * @version   $Revision: 1.10 $, $Date: 2005/03/10 10:54:47 $
 * @author Thomas Curley <tcurley@cladonia.com>
 */
public class ToolsRemoveNodeAction extends AbstractAction {

    private static final boolean DEBUG = false;
    private ExchangerEditor parent = null;
    private Editor editor = null;
    private ConfigurationProperties props;
    private ToolsRemoveNodeDialog dialog = null;

    private final int YES = 0;
    private final int NO = 1;
    private final int CANCEL = 2;

    /**
     * The constructor for the action which allows Remove Node By XPath
     *
     * @param parent the parent frame.
     */
    public ToolsRemoveNodeAction(ExchangerEditor parent, Editor editor, ConfigurationProperties props) {
        super("Remove Nodes ...");

        this.parent = parent;
        this.props = props;

        //this.properties = props;

        putValue(MNEMONIC_KEY, new Integer('R'));
        putValue(SHORT_DESCRIPTION, "Remove Nodes ...");
    }

    /**
     * Sets the current view.
     *
     * @param view the current view.
     */
    public void setView(Object view) {
        if (view instanceof Editor) {
            editor = (Editor) view;
        } else {
            editor = null;
        }

        setDocument(parent.getDocument());
    }

    public void setDocument(ExchangerDocument doc) {
        if (doc != null && doc.isXML()) {
            setEnabled(editor != null);
        } else {
            setEnabled(false);
        }
    }

    /**
     * The implementation of the validate action, called 
     * after a user action.
     *
     * @param event the action event.
     */
    public void actionPerformed(ActionEvent event) {
        if (dialog == null) {
            dialog = new ToolsRemoveNodeDialog(parent, props);
        }
        //called to make sure that the model is up to date to 
        //prevent any problems found when undo-ing etc.
        parent.getView().updateModel();

        //get the document
        final ExchangerDocument document = parent.getDocument();

        if (document.isError()) {
            MessageHandler.showError(parent, "Please make sure the document is well-formed.", "Parser Error");
            return;
        }

        //create temporary document
        String currentXPath = null;
        Node node = (Node) document.getLastNode(parent.getView().getEditor().getCursorPosition(), true);

        if (props.isUniqueXPath()) {
            currentXPath = node.getUniquePath();
        } else {
            currentXPath = node.getPath();
        }
        dialog.show(currentXPath);

        if (!dialog.isCancelled()) {
            //get the new vector of namespaces
            //Vector newNamespaces = dialog.getNamespaces();
            parent.setWait(true);
            parent.setStatus("Removing Nodes ...");

            // Run in Thread!!!
            Runnable runner = new Runnable() {
                public void run() {
                    try {
                        ExchangerDocument tempDoc = new ExchangerDocument(document.getText());

                        String newString = removeByXPath(tempDoc, dialog.xpathPanel.getXpathPredicate());
                        if (newString != null) {

                            //need to parse the new document to make sure that it
                            //will produce well-formed xml.
                            ExchangerDocument newDocument = new ExchangerDocument(newString);
                            boolean createDocument = true;

                            if (newDocument.isError()) {
                                int questionResult = MessageHandler.showConfirm(parent,
                                        "The resulting document will not be well-formed\n"
                                                + "Do you wish to continue?");

                                if (questionResult == MessageHandler.CONFIRM_NO_OPTION) {
                                    createDocument = false;
                                }
                            }

                            if (createDocument) {
                                if (dialog.toNewDocumentRadio.isSelected()) {
                                    //user has selected to create the result as a new document
                                    parent.open(newDocument, null);
                                } else {
                                    parent.getView().getEditor().setText(newString);
                                    SwingUtilities.invokeLater(new Runnable() {
                                        public void run() {
                                            parent.switchToEditor();

                                            parent.getView().updateModel();
                                        }
                                    });
                                }
                            }

                        }

                    } catch (Exception e) {
                        // This should never happen, just report and continue
                        MessageHandler.showError(parent, "Cannot Remove Nodes", "Tools Remove Node Error");
                    } finally {
                        parent.setStatus("Done");
                        parent.setWait(false);
                    }
                }
            };

            // Create and start the thread ...
            Thread thread = new Thread(runner);
            thread.start();
            //          }
        }
    }

    public String removeByXPath(ExchangerDocument document, String xpathPredicate) throws Exception {

        //List nodeList = document.getDocument().selectNodes( xpathPredicate );
        Vector nodeList = document.search(xpathPredicate);

        if (nodeList.size() > 0) {
            try {

                for (int cnt = 0; cnt < nodeList.size(); ++cnt) {

                    Node node = (Node) nodeList.get(cnt);
                    node.detach();

                }
            } catch (NullPointerException e) {
                MessageHandler.showError(parent, "XPath: " + xpathPredicate + "\nCannot be resolved",
                        "Tools Remove Node Error");
                return (null);
            } catch (Exception e) {
                MessageHandler.showError(parent, "Error removing nodes from the document",
                        "Tools Remove Node Error");
                return (null);
            }

            document.update();
        } else {
            MessageHandler.showError(parent, "No nodes could be found for:\n" + xpathPredicate,
                    "Tools Remove Node Error");
            return (null);
        }

        return document.getText();
    }
}