org.n52.web.exception.SpiAssertionExceptionAdapter Maven / Gradle / Ivy

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/*
 * Copyright (C) 2013-2019 52°North Initiative for Geospatial Open Source
 * Software GmbH
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 * If the program is linked with libraries which are licensed under one of
 * the following licenses, the combination of the program with the linked
 * library is not considered a "derivative work" of the program:
 *
 *     - Apache License, version 2.0
 *     - Apache Software License, version 1.0
 *     - GNU Lesser General Public License, version 3
 *     - Mozilla Public License, versions 1.0, 1.1 and 2.0
 *     - Common Development and Distribution License (CDDL), version 1.0
 *
 * Therefore the distribution of the program linked with libraries licensed
 * under the aforementioned licenses, is permitted by the copyright holders
 * if the distribution is compliant with both the GNU General Public License
 * version 2 and the aforementioned licenses.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 * for more details.
 */
package org.n52.web.exception;

import java.io.InputStream;

import org.n52.io.request.IoParameters;
import org.n52.io.response.OutputCollection;
import org.n52.io.response.ParameterOutput;
import org.n52.series.spi.srv.ParameterService;
import org.n52.series.spi.srv.RawDataService;

/**
 * Adapts SPI assertions to HTTP Web exceptions.
 *
 * @param 
 *        the parameter type of the service.
 */
public class SpiAssertionExceptionAdapter extends ParameterService
        implements RawDataService {

    private final ParameterService composedService;

    public SpiAssertionExceptionAdapter(ParameterService toCompose) {
        this.composedService = toCompose;
    }

    @Override
    public OutputCollection getExpandedParameters(IoParameters query) {
        OutputCollection parameters = composedService.getExpandedParameters(query);
        assertValidSpiImplementation(parameters);
        return parameters;
    }

    @Override
    public OutputCollection getCondensedParameters(IoParameters query) {
        OutputCollection parameters = composedService.getCondensedParameters(query);
        assertValidSpiImplementation(parameters);
        return parameters;
    }

    @Override
    public OutputCollection getParameters(String[] items, IoParameters query) {
        OutputCollection parameters = composedService.getParameters(items, query);
        assertValidSpiImplementation(parameters);
        return parameters;
    }

    @Override
    public T getParameter(String item, IoParameters query) {
        assertItemExists(item, query);
        return composedService.getParameter(item, query);
    }

    private void assertItemExists(String item, IoParameters parameters) {
        if (!exists(item, parameters)) {
            throw new ResourceNotFoundException("Resource with id '" + item + "' was not found.");
        }
    }

    @Override
    public boolean exists(String id, IoParameters parameters) {
        return composedService.exists(id, parameters);
    }

    @Override
    public InputStream getRawData(String id, IoParameters query) {
        if (composedService.supportsRawData()) {
            return composedService.getRawDataService()
                                  .getRawData(id, query);
        }
        return null;
    }

    @Override
    public InputStream getRawData(IoParameters parameters) {
        if (composedService.supportsRawData()) {
            return composedService.getRawDataService()
                                  .getRawData(parameters);
        }
        return null;
    }

    @Override
    public RawDataService getRawDataService() {
        return composedService.getRawDataService();
    }

    @Override
    public boolean supportsRawData() {
        return composedService.supportsRawData();
    }

    private void assertValidSpiImplementation(OutputCollection parameters) throws InternalServerException {
        if (parameters == null) {
            throw new InternalServerException("SPI implementation did return null value!");
        }
    }

}