org.wesnoth.jface.RegexStringFieldEditor.java Source code

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Here is the source code for org.wesnoth.jface.RegexStringFieldEditor.java

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/*******************************************************************************
 * Copyright (c) 2010 - 2013 by Timotei Dolean <timotei21@gmail.com>
 * 
 * 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
 *******************************************************************************/
package org.wesnoth.jface;

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

/**
 * A FieldEditor based on the {@link StringFieldEditor} which
 * can validate the value against a regex value
 */
public class RegexStringFieldEditor extends StringFieldEditor {
    protected String regex_;
    protected String errorMessage_;

    /**
     * An regex matcher string field editor.
     * 
     * @param name
     *        the name of the preference this field editor works on
     * @param labelText
     *        The label text of this field editor
     * @param regex
     *        The regex to match this textbox's string
     * @param errorMessage
     *        The message to show as error when field's text
     *        doesn't match the regex
     * @param parent
     *        The parent Composite
     */
    public RegexStringFieldEditor(String name, String labelText, String regex, String errorMessage,
            Composite parent) {
        super(name, labelText, parent);
        regex_ = regex;
        errorMessage_ = errorMessage;
    }

    @Override
    protected boolean checkState() {
        if (regex_ == null) {
            return true;
        }

        boolean matches = getTextControl().getText().matches(regex_);
        setErrorMessage(matches == false ? errorMessage_ : null);
        showErrorMessage();
        return matches;
    }
}