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Java SDK for Serverless Workflow Specification

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/*
 * Copyright 2020-Present The Serverless Workflow Specification Authors
 * 
 * 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 io.serverlessworkflow.api.deserializers;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import io.serverlessworkflow.api.interfaces.Extension;
import io.serverlessworkflow.api.interfaces.WorkflowPropertySource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class ExtensionDeserializer extends StdDeserializer {

    private WorkflowPropertySource context;
    private Map> extensionsMap = new HashMap<>();
    private static Logger logger = LoggerFactory.getLogger(ExtensionDeserializer.class);

    public ExtensionDeserializer() {
        this(Extension.class);
    }

    public ExtensionDeserializer(Class vc) {
        super(vc);
    }

    public ExtensionDeserializer(WorkflowPropertySource context) {
        this(Extension.class);
        this.context = context;
    }

    public void addExtension(String extensionId, Class extensionClass) {
        this.extensionsMap.put(extensionId, extensionClass);
    }

    @Override
    public Extension deserialize(JsonParser jp,
                                 DeserializationContext ctxt) throws IOException {

        ObjectMapper mapper = (ObjectMapper) jp.getCodec();
        JsonNode node = jp.getCodec().readTree(jp);

        String extensionId = node.get("extensionid").asText();

        if (context != null) {
            try {
                String result = context.getPropertySource().getProperty(extensionId);

                if (result != null) {
                    extensionId = result;
                }
            } catch (Exception e) {
                logger.info("Exception trying to evaluate property: {}", e.getMessage());
            }
        }

        // based on the name return the specific extension impl
        if (extensionsMap != null && extensionsMap.containsKey(extensionId)) {
            return mapper.treeToValue(node,
                    extensionsMap.get(extensionId));
        } else {
            throw new IllegalArgumentException("Extension handler not registered for: " + extensionId);
        }
    }
}