DataFetchResult.java

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/*
 * Autopsy Forensic Browser
 *
 * Copyright 2020 Basis Technology Corp.
 * Contact: carrier <at> sleuthkit <dot> org
 *
 * Licensed 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.sleuthkit.autopsy.datasourcesummary.uiutils;
 
import java.util.function.Function;

public final class DataFetchResult<R> {

    public enum ResultType {
        SUCCESS, ERROR
    }

    public static <I, O> DataFetchResult<O> getSubResult(DataFetchResult<I> inputResult, Function<I, O> getSubResult) {
        if (inputResult == null) {
            return null;
        } else if (inputResult.getResultType() == ResultType.SUCCESS) {
            O innerData = (inputResult.getData() == null) ? null : getSubResult.apply(inputResult.getData());
            return DataFetchResult.getSuccessResult(innerData);
        } else {
            return DataFetchResult.getErrorResult(inputResult.getException());
        }
    }

    public static <R> DataFetchResult<R> getSuccessResult(R data) {
        return new DataFetchResult<>(ResultType.SUCCESS, data, null);
    }

    public static <R> DataFetchResult<R> getErrorResult(Throwable e) {
        return new DataFetchResult<>(ResultType.ERROR, null, e);
    }
 
    private final ResultType state;
    private final R data;
    private final Throwable exception;

    private DataFetchResult(ResultType state, R data, Throwable exception) {
        this.state = state;
        this.data = data;
        this.exception = exception;
    }

    public ResultType getResultType() {
        return state;
    }

    public R getData() {
        return data;
    }

    public Throwable getException() {
        return exception;
    }
}