org.eclipse.gyrex.admin.ui.internal.pages.overview.SystemStatus.java Source code

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Here is the source code for org.eclipse.gyrex.admin.ui.internal.pages.overview.SystemStatus.java

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/*******************************************************************************
 * Copyright (c) 2012, 2013 AGETO Service GmbH and others.
 * All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html.
 *
 * Contributors:
 *     Gunnar Wagenknecht - initial API and implementation
 *******************************************************************************/
package org.eclipse.gyrex.admin.ui.internal.pages.overview;

import java.io.IOException;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;

import org.eclipse.gyrex.admin.ui.internal.AdminUiActivator;
import org.eclipse.gyrex.admin.ui.internal.application.AdminUiUtil;
import org.eclipse.gyrex.admin.ui.internal.pages.OverviewPageItem;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.rap.rwt.RWT;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;

import org.apache.commons.lang.exception.ExceptionUtils;

public class SystemStatus extends OverviewPageItem {

    @Override
    public Control createControl(final Composite parent) {
        final Composite composite = new Composite(parent, SWT.NULL);
        composite.setLayout(AdminUiUtil.createGridLayoutWithoutMargin(1, true));
        composite.setLayoutData(AdminUiUtil.createHorzFillData());

        AdminUiUtil.createHeading(composite, "System Status", 1);

        final Label desc = new Label(composite, SWT.WRAP);
        desc.setData(RWT.MARKUP_ENABLED, Boolean.TRUE);
        desc.setLayoutData(AdminUiUtil.createHorzFillData());

        final IStatus status = AdminUiActivator.getInstance().getSystemStatus();
        if (!status.isOK()) {
            try {
                final StringWriter writer = new StringWriter();
                final IStatus[] children = status.getChildren();
                // print details for all children of the system status
                for (final IStatus child : children) {
                    writeStatus(child, writer);
                }
                desc.setText(writer.toString());
            } catch (final IOException e) {
                desc.setText(ExceptionUtils.getRootCauseMessage(e));
            }
        } else {
            desc.setText("System is running.");
        }

        return composite;
    }

    private String getStatusImage(final IStatus status) {
        switch (status.getSeverity()) {
        case IStatus.CANCEL:
        case IStatus.ERROR:
            return "/static/error.gif";
        case IStatus.WARNING:
            return "/static/warning.gif";
        case IStatus.INFO:
        default:
            return "/static/information.gif";
        }
    }

    final void writeEscaped(final Writer writer, final Object object) throws IOException {
        if (object == null)
            return;

        final String string = object.toString();
        for (int i = 0; i < string.length(); i++) {
            final char c = string.charAt(i);

            switch (c) {
            case '&':
                writer.write("&amp;");
                break;
            case '<':
                writer.write("&lt;");
                break;
            case '>':
                writer.write("&gt;");
                break;

            default:
                if (Character.isISOControl(c) && !Character.isWhitespace(c)) {
                    writer.write('?');
                } else {
                    writer.write(c);
                }
            }
        }
    }

    private void writeStatus(final IStatus status, final Writer writer)
            throws IOException, UnsupportedEncodingException {
        // ignore OK status
        if (status.isOK())
            return;

        /*
         * sometimes we have a multi status with no message but only children;
         * in this case we just print out all children
         */
        final String statusMessage = status.getMessage();
        if (status.isMultiStatus() && ((statusMessage == null) || (statusMessage.trim().length() == 0))) {
            // write only children if a multi status has no message
            final IStatus[] children = status.getChildren();
            for (final IStatus child : children) {
                writeStatusItem(child, writer, 0);
            }
        } else {
            writeStatusItem(status, writer, 0);
        }
    }

    private void writeStatusItem(final IStatus status, final Writer writer, final int identSize)
            throws IOException {
        // ignore OK status
        if (status.isOK())
            return;

        // message
        writer.write("<img src=\"" + getStatusImage(status) + "\" height=\"16\" width=\"16\"/>  ");
        writeEscaped(writer, status.getMessage());
        writer.write(" <small><code>(");
        writeEscaped(writer, status.getPlugin());
        writer.write(", code ");
        writeEscaped(writer, String.valueOf(status.getCode()));
        writer.write(")</code></small>");

        if (status.isMultiStatus()) {
            writer.write("<br/>");
            final IStatus[] children = status.getChildren();
            for (final IStatus child : children) {
                writeStatusItem(child, writer, identSize + 4);
            }
        }
    }
}