/*******************************************************************************
 * Copyright (c) 2013, 2016 Wind River Systems, Inc. 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:
 *     Wind River Systems - initial implementation
 *******************************************************************************/
package org.eclipse.cdt.debug.internal.ui.launch;

import java.util.ArrayList;

import org.eclipse.cdt.debug.ui.CDebugUIPlugin;
import org.eclipse.core.runtime.IAdapterFactory;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.debug.ui.actions.ILaunchable;

/**
 * This is an invalid Adapter factory which insures that there  are no false
 * usages of this class when defining ILaunchable contexts. Please reference
 * the ILaunchable interface and Bugzilla : 396822.
 */
public class InvalidLaunchableAdapterFactory implements IAdapterFactory {
    private static final Class<?>[] TYPES = { ILaunchable.class };
    private static ArrayList<String> currentTraces = new ArrayList<String>();
    
    @Override
    public <T> T getAdapter(Object adaptableObject, Class<T> adapterType) {
    	/*
    	 * Calculate the trace to see if we already have seen this one. We only
    	 * want to report new instances of the violation.
    	 */
    	String trace = getStackTrace();
    	
    	if (!currentTraces.contains(trace)) {
    		/*
    		 * Note we have seen this one for the first time.
    		 */
    		currentTraces.add(trace);
    		
    		/*
    		 * Generate a message for this in the log file.
    		 */
    		String msg = LaunchMessages.getString("Launch.ILaunchable.Interface.Error");  //$NON-NLS-1$
    		
    		CDebugUIPlugin.log(new Status(IStatus.INFO, CDebugUIPlugin.PLUGIN_ID, 0, msg, new Throwable(""))); //$NON-NLS-1$
    	}
    	
    	// We do not actually provide an adapter factory for this.
        return null;
    }

    /*
     * Constructs the stack trace for comparison to see if we have seen this exact trace before.
     * We only report each unique instance once.
     */
    private String getStackTrace() {
    	String trace = ""; //$NON-NLS-1$
    	for (StackTraceElement elem : new Throwable().getStackTrace()) {
            trace += elem.getClassName() + elem.getMethodName() + elem.getFileName() + elem.getLineNumber();
        }
    	return trace;
    }
    
    /*
     * Indicates that we are adapting ILaunchable.
     */
    @Override
    public Class<?>[] getAdapterList() {
        return TYPES;
    }
}