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    • com.hubspot.rosetta.RosettaBinder Maven / Gradle / Ivy

    The newest version!
    package com.hubspot.rosetta;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.BinaryNode;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;
import java.util.function.Consumer;

public enum RosettaBinder {
  INSTANCE;

  public interface Callback {
    void bind(String key, Object value);
  }

  public void bindList(ArrayNode array, String field, Consumer valueConsumer) {
    for (JsonNode value : array) {
      if (!field.isEmpty()) {
        value = value.path(field);
        if (value.isMissingNode()) {
          throw new IllegalArgumentException(
            String.format("Field %s does not exist in elements of input array", field)
          );
        }
      }

      if (!value.isValueNode()) {
        throw new IllegalArgumentException(
          "Binding non-value types as a list is not supported"
        );
      } else {
        valueConsumer.accept(unwrapJsonValue(value));
      }
    }
  }

  public void bind(String prefix, JsonNode node, Callback callback) {
    for (
      Iterator> iterator = node.fields();
      iterator.hasNext();
    ) {
      Entry field = iterator.next();
      String key = prefix.isEmpty() ? field.getKey() : prefix + "." + field.getKey();
      JsonNode value = field.getValue();

      if (value.isObject()) {
        bind(key, value, callback);
      } else if (value.isArray()) {
        List elements = new ArrayList<>();
        for (JsonNode element : value) {
          elements.add(unwrapJsonValue(element));
        }

        callback.bind(key, elements);
      } else {
        callback.bind(key, unwrapJsonValue(value));
      }
    }
  }

  private Object unwrapJsonValue(JsonNode node) {
    if (node.isNull()) {
      return null;
    } else if (node.isBoolean()) {
      return node.booleanValue();
    } else if (node.isBinary()) {
      return ((BinaryNode) node).binaryValue();
    } else if (node.isNumber()) {
      return node.numberValue();
    } else {
      return node.asText();
    }
  }
}
    
    
    
    

    




    
    
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