org.eclipse.jdt.debug.ui/ui/org/eclipse/jdt/internal/debug/ui/launcher/VMArgumentsBlock.java

package org.eclipse.jdt.internal.debug.ui.launcher;

/**********************************************************************
Copyright (c) 2000, 2002 IBM Corp.  All rights reserved.
This file is made available under the terms of the Common Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/cpl-v10.html
**********************************************************************/

import org.eclipse.core.runtime.CoreException;
import org.eclipse.debug.core.ILaunchConfiguration;
import org.eclipse.debug.core.ILaunchConfigurationWorkingCopy;
import org.eclipse.jdt.internal.debug.ui.JDIDebugUIPlugin;
import org.eclipse.jdt.launching.IJavaLaunchConfigurationConstants;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;

/**
 * Editor for VM arguments of a Java launch configuration.
 */
public class VMArgumentsBlock extends JavaLaunchConfigurationTab {

	// VM arguments widgets
	protected Label fVMArgumentsLabel;
	protected Text fVMArgumentsText;
	
	/**
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#createControl(Composite)
	 */
	public void createControl(Composite parent) {
		Font font = parent.getFont();

		Composite comp = new Composite(parent, SWT.NONE);
		setControl(comp);
		GridLayout topLayout = new GridLayout();
		topLayout.marginHeight = 0;
		topLayout.marginWidth = 0;
		comp.setLayout(topLayout);	
		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
		comp.setLayoutData(gd);
				
		fVMArgumentsLabel = new Label(comp, SWT.NONE);
		fVMArgumentsLabel.setText(LauncherMessages.getString("JavaArgumentsTab.VM_ar&guments__6")); //$NON-NLS-1$
		fVMArgumentsLabel.setFont(font);
		
		fVMArgumentsText = new Text(comp, SWT.MULTI | SWT.WRAP| SWT.BORDER | SWT.V_SCROLL);
		gd = new GridData(GridData.FILL_BOTH);
		gd.heightHint = 40;
		gd.widthHint = 100;
		fVMArgumentsText.setLayoutData(gd);
		fVMArgumentsText.setFont(font);
		fVMArgumentsText.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent evt) {
				updateLaunchConfigurationDialog();
			}
		});	
				
	}

	/**
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#setDefaults(ILaunchConfigurationWorkingCopy)
	 */
	public void setDefaults(ILaunchConfigurationWorkingCopy configuration) {
		configuration.setAttribute(IJavaLaunchConfigurationConstants.ATTR_VM_ARGUMENTS, (String)null);		
	}

	/**
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#initializeFrom(ILaunchConfiguration)
	 */
	public void initializeFrom(ILaunchConfiguration configuration) {
		try {
			fVMArgumentsText.setText(configuration.getAttribute(IJavaLaunchConfigurationConstants.ATTR_VM_ARGUMENTS, "")); //$NON-NLS-1$
		} catch (CoreException e) {
			setErrorMessage(LauncherMessages.getString("JavaArgumentsTab.Exception_occurred_reading_configuration___15") + e.getStatus().getMessage()); //$NON-NLS-1$
			JDIDebugUIPlugin.log(e);			
		}
	}

	/**
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#performApply(ILaunchConfigurationWorkingCopy)
	 */
	public void performApply(ILaunchConfigurationWorkingCopy configuration) {
		configuration.setAttribute(IJavaLaunchConfigurationConstants.ATTR_VM_ARGUMENTS, getAttributeValueFrom(fVMArgumentsText));
	}

	/**
	 * @see org.eclipse.debug.ui.ILaunchConfigurationTab#getName()
	 */
	public String getName() {
		return LauncherMessages.getString("VMArgumentsBlock.VM_Arguments"); //$NON-NLS-1$
	}
	
	/**
	 * Retuns the string in the text widget, or <code>null</code> if empty.
	 * 
	 * @return text or <code>null</code>
	 */
	protected String getAttributeValueFrom(Text text) {
		String content = text.getText().trim();
		if (content.length() > 0) {
			return content;
		}
		return null;
	}	

}