de.fhg.igd.mapviewer.server.wms.wizard.pages.WMSLocationFieldEditor.java Source code

Introduction

Here is the source code for de.fhg.igd.mapviewer.server.wms.wizard.pages.WMSLocationFieldEditor.java

Source

/*
 * Copyright (c) 2016 Fraunhofer IGD
 * 
 * All rights reserved. This program and the accompanying materials are made
 * available 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.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contributors:
 *     Fraunhofer IGD <http://www.igd.fraunhofer.de/>
 */
package de.fhg.igd.mapviewer.server.wms.wizard.pages;

import org.eclipse.jface.preference.StringFieldEditor;
import org.eclipse.swt.widgets.Display;

import de.fhg.igd.mapviewer.concurrency.SwtCallback;
import de.fhg.igd.mapviewer.server.wms.capabilities.WMSUtil;
import de.fhg.igd.mapviewer.server.wms.wizard.pages.ConcurrentValidator.Validation;

/**
 * WMS location field editor
 * 
 * @author Simon Templer
 */
public class WMSLocationFieldEditor extends StringFieldEditor {

    private final ConcurrentValidator validator;

    private boolean doValidation = true;

    /**
     * Default constructor
     * 
     * @param display the display
     */
    public WMSLocationFieldEditor(Display display) {
        super();

        setValidateStrategy(StringFieldEditor.VALIDATE_ON_KEY_STROKE);

        validator = new ConcurrentValidator(new SwtCallback<Boolean>(display) {

            @Override
            protected void error(Throwable e) {
                setErrorMessage(e.getLocalizedMessage());
                updateState();
            }

            @Override
            protected void finished(Boolean result) {
                updateState();
            }
        }, false);
    }

    /**
     * @see StringFieldEditor#doCheckState()
     */
    @Override
    protected boolean doCheckState() {
        final String value = getStringValue();

        if (doValidation) {
            validator.runValidation(new Validation() {

                @Override
                public boolean validate() throws Exception {
                    WMSUtil.getCapabilities(value);
                    return true;
                }
            });
        }

        return validator.isValid();
    }

    private void updateState() {
        boolean oldState = isValid();

        doValidation = false;
        try {
            refreshValidState();
        } catch (Exception e) {
            // ignore
        }
        doValidation = true;

        boolean newState = isValid();
        if (oldState != newState) {
            fireStateChanged(IS_VALID, oldState, newState);
        }
    }

}