org.eclipse.ant.internal.ui.preferences.URLFieldEditor.java Source code

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Here is the source code for org.eclipse.ant.internal.ui.preferences.URLFieldEditor.java

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/*******************************************************************************
 * Copyright (c) 2000, 2013 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ant.internal.ui.preferences;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;

import org.eclipse.ant.internal.ui.AntUIPlugin;
import org.eclipse.jface.preference.StringButtonFieldEditor;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.DirectoryDialog;

public class URLFieldEditor extends StringButtonFieldEditor {

    public URLFieldEditor(String name, String labelText, Composite parent) {
        super(name, labelText, parent);
        setEmptyStringAllowed(false);
        setChangeButtonText(JFaceResources.getString("openBrowse"));//$NON-NLS-1$
        setErrorMessage(AntPreferencesMessages.URLFieldEditor_0);
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.jface.preference.StringFieldEditor#doCheckState()
     */
    @Override
    protected boolean doCheckState() {
        String text = getTextControl().getText();
        if (text != null && text.length() > 0) {
            try {
                new URL(text);
            } catch (MalformedURLException e) {
                return false;
            }
        }
        return true;
    }

    /*
     * (non-Javadoc) Method declared on StringButtonFieldEditor. Opens the directory chooser dialog and returns the <code>URL</code> of the selected
     * directory.
     */
    @Override
    protected String changePressed() {
        URL url = null;
        try {
            url = new URL(getTextControl().getText());
        } catch (MalformedURLException e1) {
            // do nothing
        }
        File f = null;
        if (url != null) {
            f = new File(url.getFile());
            if (!f.exists()) {
                f = null;
            }
        }

        File d = getDirectory(f);
        if (d == null) {
            return null;
        }

        try {
            return d.toURI().toURL().toExternalForm();
        } catch (MalformedURLException e) {
            AntUIPlugin.log("Internal error setting documentation location", e); //$NON-NLS-1$
            return null;
        }
    }

    /**
     * Helper that opens the directory chooser dialog.
     * 
     * @param startingDirectory
     *            The directory the dialog will open in.
     * @return File File or <code>null</code>.
     */
    private File getDirectory(File startingDirectory) {

        DirectoryDialog fileDialog = new DirectoryDialog(getShell(), SWT.OPEN);
        if (startingDirectory != null) {
            fileDialog.setFilterPath(startingDirectory.getPath());
        }
        String dir = fileDialog.open();
        if (dir != null) {
            dir = dir.trim();
            if (dir.length() > 0) {
                return new File(dir);
            }
        }

        return null;
    }
}