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SCIM conform data types used by OSIAM services and OSIAM connector4Java for data exchange
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/*
 * Copyright (C) 2013 tarent AG
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package org.osiam.resources.helper;

import java.io.IOException;

import org.osiam.resources.scim.Constants;
import org.osiam.resources.scim.Extension;
import org.osiam.resources.scim.User;

import com.fasterxml.jackson.core.JsonLocation;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.Version;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.module.SimpleModule;

public class UserDeserializer extends StdDeserializer {

	private static final long serialVersionUID = 1L;

	public UserDeserializer(Class valueClass) {
        super(valueClass);
    }

    @Override
    public User deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException {
        JsonNode rootNode = jp.readValueAsTree();
        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

        ExtensionDeserializer deserializer = new ExtensionDeserializer(Extension.class);
        SimpleModule testModule = new SimpleModule("ExtensionDeserializerModule", Version.unknownVersion())
                .addDeserializer(Extension.class, deserializer);
        mapper.registerModule(testModule);

        User user = mapper.readValue(rootNode.toString(), User.class);
        if (user.getSchemas() == null) {
            throw new JsonMappingException("Required field Schema is missing");
        }
        if (user.getSchemas().size() == 1) {
            return user;
        }

        User.Builder builder = new User.Builder(user);

        for (String urn : user.getSchemas()) {
            if (urn.equals(Constants.USER_CORE_SCHEMA)) {
                continue;
            }

            JsonNode extensionNode = rootNode.get(urn);
            if (extensionNode == null) {
                throw new JsonParseException("Registered extension not present.", JsonLocation.NA);
            }

            deserializer.setUrn(urn);
            Extension extension = mapper.readValue(extensionNode.toString(), Extension.class);
            builder.addExtension(extension);

        }
        return builder.build();
    }

}