eu.esdihumboldt.hale.io.gml.ui.wfs.WfsUrlFieldEditor.java Source code

Introduction

Here is the source code for eu.esdihumboldt.hale.io.gml.ui.wfs.WfsUrlFieldEditor.java

Source

/*
 * Copyright (c) 2012 Data Harmonisation Panel
 * 
 * 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:
 *     HUMBOLDT EU Integrated Project #030962
 *     Data Harmonisation Panel <http://www.dhpanel.eu>
 */
package eu.esdihumboldt.hale.io.gml.ui.wfs;

import java.net.URL;

import org.eclipse.jface.preference.StringButtonFieldEditor;
import org.eclipse.jface.preference.StringFieldEditor;
import org.eclipse.jface.wizard.WizardDialog;
import org.eclipse.swt.widgets.Composite;

import de.fhg.igd.slf4jplus.ALogger;
import de.fhg.igd.slf4jplus.ALoggerFactory;
import eu.esdihumboldt.hale.io.gml.ui.wfs.wizard.WfsDescribeFeatureConfiguration;
import eu.esdihumboldt.hale.io.gml.ui.wfs.wizard.WfsDescribeFeatureWizard;
import eu.esdihumboldt.hale.io.gml.ui.wfs.wizard.WfsGetFeatureConfiguration;
import eu.esdihumboldt.hale.io.gml.ui.wfs.wizard.WfsGetFeatureWizard;

/**
 * This editor can be used to select a valid {@link URL} for a WFS to retrieve
 * schema information from. It delegates all details to the
 * {@link WfsDescribeFeatureWizard} and {@link WfsGetFeatureWizard}.
 * 
 * @author Thorsten Reitz
 * @author Jan Kolar
 * @author Simon Templer
 * @partner 01 / Fraunhofer Institute for Computer Graphics Research
 * @partner 02 / Intergraph CS
 */
public class WfsUrlFieldEditor extends StringButtonFieldEditor {

    private final static ALogger _log = ALoggerFactory.getLogger(WfsUrlFieldEditor.class);

    private boolean _getFeatures = false;

    private final String schemaNamespace;

    /**
     * Constructor
     * 
     * @param name the preference name
     * @param labelText the label text
     * @param parent the parent composite
     */
    public WfsUrlFieldEditor(String name, String labelText, Composite parent) {
        super(name, labelText, parent);

        setValidateStrategy(StringFieldEditor.VALIDATE_ON_KEY_STROKE);
        setEmptyStringAllowed(false);

        this.schemaNamespace = null;
    }

    /**
     * Constructor
     * 
     * @param name the preference name
     * @param labelText the label text
     * @param parent the parent composite
     * @param schemaNamespace the schema namespace, may be <code>null</code>
     * @param getFeatures if the editor is for a GetFeature request instead of a
     *            DescribeFeature request
     */
    public WfsUrlFieldEditor(String name, String labelText, Composite parent, String schemaNamespace,
            boolean getFeatures) {
        super(name, labelText, parent);
        this._getFeatures = getFeatures;

        setValidateStrategy(StringFieldEditor.VALIDATE_ON_KEY_STROKE);
        setEmptyStringAllowed(false);

        this.schemaNamespace = schemaNamespace;
    }

    /**
     * @see StringFieldEditor#checkState()
     */
    @Override
    protected boolean checkState() {
        // reset error message in case of an empty string
        setErrorMessage("Please specify a valid URL");

        return super.checkState();
    }

    /**
     * @see StringButtonFieldEditor#changePressed()
     */
    @Override
    protected String changePressed() {
        URL result = null;

        if (!this._getFeatures) {
            WfsDescribeFeatureConfiguration conf = new WfsDescribeFeatureConfiguration();
            WfsDescribeFeatureWizard describeFeatureWizard = new WfsDescribeFeatureWizard(conf);
            WizardDialog dialog = new WizardDialog(this.getShell(), describeFeatureWizard);
            if (dialog.open() == WizardDialog.OK) {
                try {
                    result = conf.getRequestURL();
                } catch (Throwable e) {
                    _log.userError("Error getting the request URL", e); //$NON-NLS-1$
                }
            }
        } else {
            WfsGetFeatureConfiguration conf = new WfsGetFeatureConfiguration(schemaNamespace);
            WfsGetFeatureWizard getFeatureWizard = new WfsGetFeatureWizard(conf);
            WizardDialog dialog = new WizardDialog(this.getShell(), getFeatureWizard);
            if (dialog.open() == WizardDialog.OK) {
                try {
                    result = conf.getRequestURL();
                } catch (Throwable e) {
                    _log.userError("Error getting the request URL", e); //$NON-NLS-1$
                }
            }
        }

        if (result != null) {
            return result.toString();
        } else { // applicable if cancel is pressed.
            return null; //$NON-NLS-1$
        }
    }

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

        try {
            new URL(value);
        } catch (Throwable e) {
            setErrorMessage(e.getLocalizedMessage());
            return false;
        }

        return true;
    }

    /**
     * Get the URL value.
     * 
     * @return the URL or <code>null</code> if the content is no valid URL.
     */
    public URL getURL() {
        try {
            return new URL(getStringValue());
        } catch (Throwable e) {
            setErrorMessage(e.getLocalizedMessage());
            return null;
        }
    }

}