org.n52.iceland.binding.json.JSONBinding.java Source code

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Here is the source code for org.n52.iceland.binding.json.JSONBinding.java

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/*
 * Copyright 2015 52North Initiative for Geospatial Open Source
 * Software GmbH
 *
 * 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.n52.iceland.binding.json;

import java.io.IOException;
import java.util.Collections;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.n52.iceland.binding.Binding;
import org.n52.iceland.binding.SimpleBinding;
import org.n52.iceland.coding.OperationKey;
import org.n52.iceland.coding.decode.Decoder;
import org.n52.iceland.coding.decode.OperationDecoderKey;
import org.n52.iceland.exception.HTTPException;
import org.n52.iceland.exception.ows.NoApplicableCodeException;
import org.n52.iceland.exception.ows.OwsExceptionReport;
import org.n52.iceland.exception.ows.concrete.NoDecoderForKeyException;
import org.n52.iceland.ogc.sos.Sos2Constants;
import org.n52.iceland.ogc.sos.SosConstants;
import org.n52.iceland.request.AbstractServiceRequest;
import org.n52.iceland.response.AbstractServiceResponse;
import org.n52.iceland.util.JSONUtils;
import org.n52.iceland.util.http.MediaType;
import org.n52.iceland.util.http.MediaTypes;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.n52.iceland.binding.BindingKey;
import org.n52.iceland.binding.MediaTypeBindingKey;
import org.n52.iceland.binding.PathBindingKey;

import com.fasterxml.jackson.databind.JsonNode;
import com.google.common.collect.ImmutableSet;

/**
 * {@link Binding} implementation for JSON encoded requests
 *
 * @author <a href="mailto:c.autermann@52north.org">Christian Autermann</a>
 * @since 1.0.0
 */
public class JSONBinding extends SimpleBinding {
    private static final String URL_PATTERN = "/json";
    private static final String CONFORMANCE_CLASS = "http://www.opengis.net/spec/SOS/2.0/conf/json";
    private static final Set<String> CONFORMANCE_CLASSES = Collections.singleton(CONFORMANCE_CLASS);
    private static final Logger LOG = LoggerFactory.getLogger(JSONBinding.class);
    private static final String SERVICE = "service";
    private static final String VERSION = "version";
    private static final String REQUEST = "request";

    private static final ImmutableSet<BindingKey> KEYS = ImmutableSet.<BindingKey>builder()
            .add(new PathBindingKey(URL_PATTERN)).add(new MediaTypeBindingKey(MediaTypes.APPLICATION_JSON)).build();

    @Override
    public Set<BindingKey> getKeys() {
        return Collections.unmodifiableSet(KEYS);
    }

    @Override
    public Set<String> getConformanceClasses(String service, String version) {
        if (SosConstants.SOS.equals(service) && Sos2Constants.SERVICEVERSION.equals(version)) {
            return Collections.unmodifiableSet(CONFORMANCE_CLASSES);
        }
        return Collections.emptySet();
    }

    @Override
    protected boolean isUseHttpResponseCodes() {
        return true;
    }

    @Override
    protected MediaType getDefaultContentType() {
        return MediaTypes.APPLICATION_JSON;
    }

    @Override
    public boolean checkOperationHttpPostSupported(OperationKey k) throws HTTPException {
        return getDecoder(new OperationDecoderKey(k, MediaTypes.APPLICATION_JSON)) != null;
    }

    @Override
    public void doPostOperation(HttpServletRequest req, HttpServletResponse res) throws HTTPException, IOException {
        AbstractServiceRequest<?> request = null;
        try {
            request = parseRequest(req);
            checkServiceOperatorKeyTypes(request);
            AbstractServiceResponse response = getServiceOperator(request).receiveRequest(request);
            writeResponse(req, res, response);
        } catch (OwsExceptionReport oer) {
            oer.setVersion(request != null ? request.getVersion() : null);
            writeOwsExceptionReport(req, res, oer);
        }
    }

    private AbstractServiceRequest<?> parseRequest(HttpServletRequest request) throws OwsExceptionReport {
        try {
            JsonNode json = JSONUtils.loadReader(request.getReader());
            if (LOG.isDebugEnabled()) {
                LOG.debug("JSON-REQUEST: {}", JSONUtils.print(json));
            }
            OperationDecoderKey key = new OperationDecoderKey(json.path(SERVICE).textValue(),
                    json.path(VERSION).textValue(), json.path(REQUEST).textValue(), MediaTypes.APPLICATION_JSON);
            Decoder<AbstractServiceRequest<?>, JsonNode> decoder = getDecoder(key);
            if (decoder == null) {
                throw new NoDecoderForKeyException(key);
            }
            AbstractServiceRequest<?> sosRequest = decoder.decode(json);
            sosRequest.setRequestContext(getRequestContext(request));
            return sosRequest;
        } catch (IOException ioe) {
            throw new NoApplicableCodeException().causedBy(ioe)
                    .withMessage("Error while reading request! Message: %s", ioe.getMessage());
        }
    }

    @Override
    public String getUrlPattern() {
        return URL_PATTERN;
    }

    @Override
    public Set<MediaType> getSupportedEncodings() {
        return Collections.singleton(MediaTypes.APPLICATION_JSON);
    }

}