org.eclipse.debug.internal.ui.views.memory.CodePagesPreferencePage.java Source code

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Here is the source code for org.eclipse.debug.internal.ui.views.memory.CodePagesPreferencePage.java

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/*******************************************************************************
 * Copyright (c) 2006 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.debug.internal.ui.views.memory;

import java.io.UnsupportedEncodingException;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.debug.internal.ui.DebugUIMessages;
import org.eclipse.debug.internal.ui.DebugUIPlugin;
import org.eclipse.debug.ui.DebugUITools;
import org.eclipse.debug.ui.IDebugUIConstants;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.preference.FieldEditorPreferencePage;
import org.eclipse.jface.preference.StringFieldEditor;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.PlatformUI;

public class CodePagesPreferencePage extends FieldEditorPreferencePage {

    private StringFieldEditor fEbcdicCodePage;
    private StringFieldEditor fAsciiCodePage;

    protected CodePagesPreferencePage() {
        super(FieldEditorPreferencePage.GRID);
        setPreferenceStore(DebugUITools.getPreferenceStore());
        setTitle(DebugUIMessages.CodePagesPrefDialog_1);
    }

    protected void createFieldEditors() {
        fAsciiCodePage = new StringFieldEditor(IDebugUIConstants.PREF_DEFAULT_ASCII_CODE_PAGE,
                DebugUIMessages.CodePagesPrefDialog_2, getFieldEditorParent());
        fAsciiCodePage.setEmptyStringAllowed(false);
        addField(fAsciiCodePage);

        fEbcdicCodePage = new StringFieldEditor(IDebugUIConstants.PREF_DEFAULT_EBCDIC_CODE_PAGE,
                DebugUIMessages.CodePagesPrefDialog_4, getFieldEditorParent());
        fEbcdicCodePage.setEmptyStringAllowed(false);
        addField(fEbcdicCodePage);
    }

    public boolean performOk() {

        if (fAsciiCodePage == null || fEbcdicCodePage == null)
            return super.performOk();

        // check that the codepages are supported
        String asciiCodePage = fAsciiCodePage.getStringValue();
        asciiCodePage = asciiCodePage.trim();
        try {
            new String(new byte[] { 1 }, asciiCodePage);
        } catch (UnsupportedEncodingException e) {
            Shell shell = DebugUIPlugin.getShell();
            if (shell != null) {
                IStatus status = DebugUIPlugin.newErrorStatus(DebugUIMessages.CodePagesPrefDialog_0, e);
                ErrorDialog.openError(shell, DebugUIMessages.CodePagesPrefDialog_6,
                        DebugUIMessages.CodePagesPrefDialog_7, status); // 
            }
            return false;
        }

        String ebcdicCodePage = fEbcdicCodePage.getStringValue();
        ebcdicCodePage = ebcdicCodePage.trim();
        try {
            new String(new byte[] { 1 }, ebcdicCodePage);
        } catch (UnsupportedEncodingException e) {
            Shell shell = DebugUIPlugin.getShell();
            if (shell != null) {
                IStatus status = DebugUIPlugin.newErrorStatus(DebugUIMessages.CodePagesPrefDialog_0, e);
                ErrorDialog.openError(shell, DebugUIMessages.CodePagesPrefDialog_8,
                        DebugUIMessages.CodePagesPrefDialog_9, status); // 
            }
            return false;
        }
        return super.performOk();
    }

    protected Control createContents(Composite parent) {
        PlatformUI.getWorkbench().getHelpSystem().setHelp(parent,
                DebugUIPlugin.getUniqueIdentifier() + ".CodePagesPrefDialog_context"); //$NON-NLS-1$
        return super.createContents(parent);
    }

}