com.github.bloodshura.ignitium.cfg.json.mapping.ValueMapper Maven / Gradle / Ivy

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A collection of configuration and serialization readers and writers, like JSON, internationalization (I18n), and CSV.
There is a newer version: 1.0.1
package com.github.bloodshura.ignitium.cfg.json.mapping;

import com.github.bloodshura.ignitium.enumeration.Enumerations;
import com.github.bloodshura.ignitium.worker.ParseWorker;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

public interface ValueMapper {
	@Nullable
	default Object defaultValue() {
		return null;
	}

	@Nullable
	Object map(@Nullable Object value);

	final class ByIdentifier implements ValueMapper {
		private final Class> type;

		public ByIdentifier(Class> type) {
			this.type = type;
		}

		@Nullable
		@Override
		public Object map(@Nullable Object value) {
			return value != null ? Enumerations.search(type, value.toString()) : null;
		}
	}

	final class ByOrdinal implements ValueMapper {
		private final Class> type;

		public ByOrdinal(Class> type) {
			this.type = type;
		}

		@Nullable
		@Override
		public Object map(@Nullable Object value) {
			if (value == null) {
				return null;
			}

			int index = ParseWorker.toInt(value.toString(), -1);
			Enum[] constants = type.getEnumConstants();

			return index >= 0 && index < constants.length ? constants[index] : null;
		}
	}

	@Nullable
	static ValueMapper createMapper(@Nullable Class mapperClass, @Nonnull Class structureType, @Nonnull Class type, @Nonnull String paramName) throws JsonMappingException {
		if (type.isEnum()) {
			try {
				ValueMapper mapper;

				if (mapperClass != null) {
					try {
						try {
							Constructor constructor = mapperClass.getDeclaredConstructor(Class.class);

							try {
								constructor.setAccessible(true);
								mapper = constructor.newInstance(type);
							} finally {
								constructor.setAccessible(false);
							}
						} catch (NoSuchMethodException exception) {
							Constructor constructor = mapperClass.getDeclaredConstructor();

							try {
								constructor.setAccessible(true);
								mapper = constructor.newInstance();
							} finally {
								constructor.setAccessible(false);
							}
						}
					} catch (InvocationTargetException exception) {
						throw new JsonMappingException("Could not instantiate the value mapper \"" + mapperClass.getName() + "\" of " + structureType.getSimpleName() + "::" + paramName, exception);
					} catch (NoSuchMethodException exception) {
						throw new JsonMappingException("Could not find suitable constructor for value mapper \"" + mapperClass.getName() + "\" of " + structureType.getSimpleName() + "::" + paramName);
					}
				} else {
					mapper = new ValueMapper.ByIdentifier((Class>) type);
				}

				return mapper;
			} catch (IllegalAccessException | InstantiationException exception) {
				throw new JsonMappingException("Could not instantiate the value mapper \"" + mapperClass.getName() + "\" of " + structureType.getSimpleName() + "::" + paramName);
			}
		} else if (mapperClass != null) {
			try {
				ValueMapper mapper;

				try {
					Constructor constructor = mapperClass.getDeclaredConstructor();

					try {
						constructor.setAccessible(true);
						mapper = constructor.newInstance();
					} finally {
						constructor.setAccessible(false);
					}
				} catch (InvocationTargetException exception) {
					throw new JsonMappingException("Could not instantiate the value mapper \"" + mapperClass.getName() + "\" of " + structureType.getSimpleName() + "::" + paramName, exception);
				} catch (NoSuchMethodException exception) {
					throw new JsonMappingException("Could not find suitable constructor for value mapper \"" + mapperClass.getName() + "\" of " + structureType.getSimpleName() + "::" + paramName);
				}

				return mapper;
			} catch (IllegalAccessException | InstantiationException exception) {
				throw new JsonMappingException("Could not instantiate the value mapper \"" + mapperClass.getName() + "\" of " + structureType.getSimpleName() + "::" + paramName);
			}
		}

		return null;
	}
}