/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package betsy.bpel.virtual.host.exceptions.vm;

import java.util.HashMap;
import java.util.Map;

import org.virtualbox_4_2.VBoxException;
import org.virtualbox_4_2.jaxws.RuntimeFaultMsg;

/**
 * Maps the error codes in the Virtual Box Java API into enum values.
 * <p/>
 * <p/>
 * To get the error code from a VBoxException, use:
 * 
 * <pre>
 * try {
 *    ...
 *    ...
 * }
 * catch (VBoxException vboxException) {
 *    RuntimeFaultMsg fault = (RuntimeFaultMsg) vboxException.getWrapped();
 *    int faultCode = fault.getFaultInfo().getResultCode();
 *    ErrorCode errorCode = ErrorCode.valueOf(faultCode);
 * }
 * </pre>
 * 
 * @author Mattias Holmqvist
 */
public enum VBoxExceptionCode {

	VBOX_E_OBJECT_NOT_FOUND(2159738881L), VBOX_E_INVALID_VM_STATE(2159738882L), VBOX_E_VM_ERROR(
			2159738883L), VBOX_E_FILE_ERROR(2159738884L), VBOX_E_IPRT_ERROR(
			2159738885L), VBOX_E_PDM_ERROR(2159738886L), VBOX_E_INVALID_OBJECT_STATE(
			2159738887L), VBOX_E_HOST_ERROR(2159738888L), VBOX_E_NOT_SUPPORTED(
			2159738889L), VBOX_E_XML_ERROR(2159738890L), VBOX_E_INVALID_SESSION_STATE(
			2159738891L), VBOX_E_OBJECT_IN_USE(2159738892L), VBOX_E_ACCESSDENIED(
			2147942405L), VBOX_E_POINTER(2147500035L), VBOX_E_FAIL(2147500037L), VBOX_E_NOTIMPL(
			2147500033L), VBOX_E_OUTOFMEMORY(2147942414L), VBOX_E_INVALIDARG(
			2147942487L), VBOX_E_UNEXPECTED(2147549183L), VBOX_E_UNKNOWN_ERROR_CODE(
			-1L), VBOX_E_ERROR_CODE_UNAVAILABLE(-2L);

	private long code;

	private static Map<Long, VBoxExceptionCode> table = new HashMap<>();

	VBoxExceptionCode(long code) {
		this.code = code;
	}

	static {
		for (VBoxExceptionCode errorCode : VBoxExceptionCode.values()) {
			table.put(errorCode.code, errorCode);
		}
	}

	/**
	 * Returns an ErrorCode from the fault code given by the VirtualBox API.
	 * 
	 * @param vboxException
	 *            the exception to get the error code from.
	 * @return an ErrorCode representing the given fault code.
	 */
	public static VBoxExceptionCode valueOf(VBoxException vboxException) {
		final Throwable wrapped = vboxException.getWrapped();
		if (wrapped instanceof RuntimeFaultMsg) {
			final RuntimeFaultMsg faultCode = (RuntimeFaultMsg) wrapped;
			final int resultCode = faultCode.getFaultInfo().getResultCode();
			final VBoxExceptionCode errorCode = table
					.get(unsignedIntToLong(resultCode));
			if (errorCode != null) {
				return errorCode;
			}
			return VBOX_E_UNKNOWN_ERROR_CODE;
		}
		return VBOX_E_ERROR_CODE_UNAVAILABLE;
	}

	private static long unsignedIntToLong(int faultCode) {
		return faultCode & 0xffffffffL;
	}

}