server/protocols/jmap-draft/src/main/java/org/apache/james/jmap/draft/model/deserialization/JmapRuleDTODeserializer.java

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package org.apache.james.jmap.draft.model.deserialization;

import java.io.IOException;

import org.apache.commons.lang3.StringUtils;
import org.apache.james.jmap.draft.model.JmapRuleDTO;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.google.common.base.Preconditions;

public class JmapRuleDTODeserializer extends JsonDeserializer<JmapRuleDTO> {

    @Override
    public JmapRuleDTO deserialize(JsonParser jp, DeserializationContext deserializationContext) throws IOException {
        JsonNode node = jp.readValueAsTree();

        JsonNode idNode = node.get("id");
        Preconditions.checkArgument(!idNode.isNull(), "`id` is mandatory");
        Preconditions.checkArgument(StringUtils.isNotBlank(idNode.asText()), "`id` is mandatory");

        JsonNode nameNode = node.get("name");
        Preconditions.checkArgument(!nameNode.isNull(), "`name` is mandatory");
        Preconditions.checkArgument(StringUtils.isNotBlank(nameNode.asText()), "`name` is mandatory");

        JsonNode conditionNode = node.get("condition");
        Preconditions.checkArgument(!conditionNode.isNull(), "`condition` is mandatory");
        JmapRuleDTO.ConditionDTO conditionDTO = jp.getCodec().treeToValue(conditionNode, JmapRuleDTO.ConditionDTO.class);

        JsonNode actionNode = node.get("action");
        Preconditions.checkArgument(!actionNode.isNull(), "`action` is mandatory");
        JmapRuleDTO.ActionDTO actionDTO = jp.getCodec().treeToValue(actionNode, JmapRuleDTO.ActionDTO.class);

        return new JmapRuleDTO(node.get("id").asText(), node.get("name").asText(), conditionDTO, actionDTO);
    }
}