| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF 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 org.apache.ignite.internal.visor; |
| |
| import java.io.Externalizable; |
| import java.io.IOException; |
| import java.io.ObjectInput; |
| import java.io.ObjectOutput; |
| import org.apache.ignite.internal.util.typedef.internal.S; |
| |
| /** |
| * Base class for Visor result with error. |
| * |
| * @param <T> Result type. |
| */ |
| public class VisorEither<T> implements Externalizable { |
| /** */ |
| private static final long serialVersionUID = 0L; |
| |
| /** Exception on execution. */ |
| private Throwable error; |
| |
| /** Result. */ |
| private T res; |
| |
| /** |
| * Default constructor. |
| */ |
| public VisorEither() { |
| // No-op. |
| } |
| |
| /** |
| * @param error Exception on execution. |
| */ |
| public VisorEither(Throwable error) { |
| this.error = error; |
| } |
| |
| /** |
| * @param res Result. |
| */ |
| public VisorEither(T res) { |
| this.res = res; |
| } |
| |
| /** |
| * @return {@code true} If failed on execution. |
| */ |
| public boolean failed() { |
| return error != null; |
| } |
| |
| /** |
| * @return Exception on execution. |
| */ |
| public Throwable getError() { |
| return error; |
| } |
| |
| /** |
| * @return Result. |
| */ |
| public T getResult() { |
| return res; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void writeExternal(ObjectOutput out) throws IOException { |
| boolean failed = failed(); |
| |
| out.writeBoolean(failed); |
| out.writeObject(failed ? error : res); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException { |
| if (in.readBoolean()) |
| error = (Throwable)in.readObject(); |
| else |
| res = (T)in.readObject(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public String toString() { |
| return S.toString(VisorEither.class, this); |
| } |
| } |