org.eclipse.qvt.declarative.parser.ui.preferences.ExtensionsStringFieldEditor.java Source code

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Here is the source code for org.eclipse.qvt.declarative.parser.ui.preferences.ExtensionsStringFieldEditor.java

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/*******************************************************************************
 * Copyright (c) 2007 E.D.Willink 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:
 *     E.D.Willink - initial API and implementation
 *******************************************************************************/
package org.eclipse.qvt.declarative.parser.ui.preferences;

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

/**
 * Class used to edit a "*.xxx" extension.
 */
public class ExtensionsStringFieldEditor extends StringFieldEditor {
    private String oldExtensions = null;

    public ExtensionsStringFieldEditor(String name, String labelText, Composite parent) {
        super(name, labelText, parent);
        setEmptyStringAllowed(false);
        setErrorMessage("File-name patterns starting with *. and separated by commas required");
    }

    @Override
    protected boolean checkState() {
        if (getExtensionsFromControl() != null) {
            clearErrorMessage();
            return true;
        } else {
            showErrorMessage();
            return false;
        }
    }

    @Override
    protected void doLoad() {
        String value = getPreferenceStore().getString(getPreferenceName());
        setStringValue(value);
    }

    @Override
    protected void doLoadDefault() {
        String value = getPreferenceStore().getDefaultString(getPreferenceName());
        setStringValue(value);
    }

    @Override
    protected void doStore() {
        String extensionsString = getNonNullExtensionsFromControl();
        getPreferenceStore().setValue(getPreferenceName(), extensionsString);
    }

    protected String getExtensionsFromControl() {
        Text textField = getTextControl();
        if (textField == null)
            return null;
        StringBuffer s = null;
        for (String extensionString : textField.getText().split(",")) {
            String trimmedString = extensionString.trim();
            if (!trimmedString.startsWith("*."))
                return null;
            if (s == null)
                s = new StringBuffer();
            else
                s.append(",");
            s.append(trimmedString.substring(2));
        }
        return s != null ? s.toString() : null;
    }

    protected String getNonNullExtensionsFromControl() {
        String extensionsString = getExtensionsFromControl();
        return extensionsString != null ? extensionsString : "";
    }

    @Override
    public String getStringValue() {
        String value = getExtensionsFromControl();
        if (value != null)
            return value;
        return getPreferenceStore().getString(getPreferenceName());
    }

    @Override
    public void setStringValue(String value) {
        Text textField = getTextControl();
        if (textField != null) {
            String newExtensions = value != null ? value : "";
            oldExtensions = getNonNullExtensionsFromControl();
            if (!oldExtensions.equals(newExtensions)) {
                StringBuffer s = null;
                for (String newExtension : newExtensions.split(",")) {
                    if (s == null)
                        s = new StringBuffer();
                    else
                        s.append(",");
                    s.append("*.");
                    s.append(newExtension);
                }
                textField.setText(s != null ? s.toString() : "");
                valueChanged();
            }
        }
    }

    @Override
    protected void valueChanged() {
        setPresentsDefaultValue(false);
        boolean oldState = isValid();
        refreshValidState();
        boolean newState = isValid();
        if (newState != oldState) {
            fireStateChanged(IS_VALID, oldState, newState);
        }
        String newExtensions = getNonNullExtensionsFromControl();
        if (!oldExtensions.equals(newExtensions)) {
            fireValueChanged(VALUE, oldExtensions, newExtensions);
            oldExtensions = newExtensions;
        }
    }
}