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Klojang Invoke is a Java module focused on path-based object access and dynamic invocation. Its central classes are the Path class and the PathWalker class. The Path class captures a path through an object graph. For example "employee.address.city". The PathWalker class lets you read from and write to a wide variety of types using Path objects.

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package org.klojang.path;

import java.util.Map;

import static org.klojang.path.PathWalkerException.keyDeserializationFailed;
import static org.klojang.path.PathWalkerException.notModifiable;

@SuppressWarnings({"rawtypes", "unchecked"})
final class MapSegmentWriter extends SegmentWriter {

  MapSegmentWriter(boolean suppressExceptions, KeyDeserializer keyDeserializer) {
    super(suppressExceptions, keyDeserializer);
  }

  @Override
  boolean write(Map map, Path path, Object value) {
    int segment = path.size() - 1;
    Object key;
    if (kd == null) {
      key = path.segment(segment);
    } else {
      try {
        key = kd.deserialize(path, segment);
      } catch (KeyDeserializationException e) {
        return deadEnd(keyDeserializationFailed(path, segment, e));
      }
    }
    try {
      map.put(key, value);
    } catch (UnsupportedOperationException e) {
      return deadEnd(notModifiable(path, segment, Map.class));
    }
    return true;
  }

}