ExceptionHelper.java example

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scisoft-core-master
/*
 * Copyright (c) 2012 Diamond Light Source Ltd.
 *
 * 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
 */

package uk.ac.diamond.scisoft.analysis.rpc.flattening.helpers;

import java.util.Map;

import org.eclipse.dawnsci.analysis.api.rpc.AnalysisRpcRemoteException;

import uk.ac.diamond.scisoft.analysis.rpc.flattening.IRootFlattener;

public class ExceptionHelper extends MapFlatteningHelper<Exception> {
	public static final String EXECTYPESTR = "exctypestr";
	public static final String EXECVALUESTR = "excvaluestr";
	public static final String TRACEBACK = "traceback";
	public static final String PYTHONTEXTS = "pythontexts";

	public ExceptionHelper() {
		super(Exception.class);
	}

	@Override
	public AnalysisRpcRemoteException unflatten(Map<?, ?> thisMap, IRootFlattener rootFlattener) {
		String exctypestr = (String) rootFlattener.unflatten(thisMap
				.get(EXECTYPESTR));
		String excvaluestr = (String) rootFlattener.unflatten(thisMap
				.get(EXECVALUESTR));
		String message = exctypestr;
		if (excvaluestr != null) {
			message += ": " + excvaluestr;
		}
		final StackTraceElement[] stackTrace;
		if (!thisMap.containsKey(TRACEBACK)) {
			StackTraceElement ste = new StackTraceElement(
					"<ExceptionInOtherEndDuringAnalysisRpcCall>", "<unknown>",
					"<unknown>", -1);
			stackTrace = new StackTraceElement[] { ste };
		} else {
			stackTrace = (StackTraceElement[]) rootFlattener.unflatten(thisMap
					.get(TRACEBACK));
		}
		if (thisMap.containsKey(PYTHONTEXTS)) {
			final AnalysisRpcRemoteException e = new AnalysisRpcRemoteException(message);
			e.setStackTrace(stackTrace);
			Object unflatten = rootFlattener.unflatten(thisMap.get(PYTHONTEXTS));
			String[] texts = (String[]) unflatten;
			e.setStackTraceTexts(texts);
			return e;
		} else {
			final AnalysisRpcRemoteException e = new AnalysisRpcRemoteException(message);
			e.setStackTrace(stackTrace);
			return e;
		}
	}

	@Override
	public Object flatten(Object obj, IRootFlattener rootFlattener) {
		Exception thisException = (Exception) obj;
		Map<String, Object> outMap = createMap(getTypeCanonicalName());
		outMap.put(EXECTYPESTR, rootFlattener.flatten(thisException.getClass()
				.getCanonicalName()));
		outMap.put(EXECVALUESTR,
				rootFlattener.flatten(thisException.getLocalizedMessage()));
		outMap.put(TRACEBACK,
				rootFlattener.flatten(thisException.getStackTrace()));
		if (thisException instanceof AnalysisRpcRemoteException) {
			AnalysisRpcRemoteException excWithTexts = (AnalysisRpcRemoteException) thisException;
			outMap.put(PYTHONTEXTS,
					rootFlattener.flatten(excWithTexts.getStackTraceTexts()));
		}
		return outMap;
	}

}