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/*******************************************************************************
 * Copyright (c) 2000, 2005 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.jdt.internal.debug.ui.actions;


import org.eclipse.jdt.internal.debug.ui.JDIDebugUIPlugin;
import org.eclipse.jdt.internal.debug.ui.launcher.IClasspathViewer;
import org.eclipse.jface.dialogs.IDialogSettings;

/**
 * Abstract action that opens a dialog. Contains a prefix for dialog preference
 * settings.
 */
public abstract class OpenDialogAction extends RuntimeClasspathAction {
	
	/**
	 * Attribute name for the last path used to open a file/directory chooser
	 * dialog.
	 */
	protected static final String LAST_PATH_SETTING = "LAST_PATH_SETTING"; //$NON-NLS-1$
	
	/**
	 * Dialog settings prefix/qualifier
	 */
	private String fPrefix = null;

	/**
	 * Constructs an action that opens a dialog.
	 */
	public OpenDialogAction(String label, IClasspathViewer viewer, String dialogSettingsPrefix) {
		super(label, viewer);
		fPrefix = dialogSettingsPrefix;
	}
	
	/**
	 * Returns the prefix of the identifier used to store dialog settings for
	 * this action.
	 */
	protected String getDialogSettingsPrefix() {
		return fPrefix;
	}
	
	/**
	 * Returns the value of the dialog setting, associated with the given
	 * settingName, resolved by the dialog setting prefix associated with this
	 * action.
	 * 
	 * @param settingName unqualified setting name
	 * @return value or <code>null</code> if none
	 */
	protected String getDialogSetting(String settingName) {
		return getDialogSettings().get(getDialogSettingsPrefix() + "." + settingName); //$NON-NLS-1$
	}
	
	/**
	 * Sets the value of the dialog setting, associated with the given
	 * settingName, resolved by the dialog setting prefix associated with this
	 * action.
	 * 
	 * @param settingName unqualified setting name
	 * @return value or <code>null</code> if none
	 */
	protected void setDialogSetting(String settingName, String value) {
		getDialogSettings().put(getDialogSettingsPrefix() + "." + settingName, value); //$NON-NLS-1$
	}

	/**
	 * Returns this plug-in's dialog settings.
	 * 
	 * @return IDialogSettings
	 */
	protected IDialogSettings getDialogSettings() {
		IDialogSettings settings = JDIDebugUIPlugin.getDefault().getDialogSettings();
		return settings;
	}
	
	protected int getActionType() {
		return ADD;
	}
}

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