73 lines
2.5 KiB
Java
73 lines
2.5 KiB
Java
package net.tomatentum.marinara.wrapper;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import org.slf4j.Logger;
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import io.leangen.geantyref.GenericTypeReflector;
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import net.tomatentum.marinara.interaction.ident.InteractionIdentifier;
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import net.tomatentum.marinara.util.LoggerUtil;
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import net.tomatentum.marinara.util.ReflectionUtil;
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public class IdentifierProvider {
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public static IdentifierProvider of(Converter<?>... converter) {
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return new IdentifierProvider(Arrays.asList(converter));
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}
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private Map<Class<?>, Converter<?>> converter;
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private Logger logger = LoggerUtil.getLogger(getClass());
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private IdentifierProvider(List<Converter<?>> converter) {
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this.converter = new HashMap<>();
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for (Converter<?> conv : converter) {
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if (conv.getClass().getName().contains("$$Lambda"))
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throw new IllegalArgumentException("Lambdas cannot be used for IdentifierConverter because of Type erasure.");
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Type type = GenericTypeReflector.getExactSuperType(conv.getClass(), Converter.class);
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Type parameterType = (Class<?>) ((ParameterizedType) type).getActualTypeArguments()[0];
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if (!(parameterType instanceof Class))
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throw new IllegalArgumentException("Only full Class types are supported by IdentiferConverters");
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this.converter.put((Class<?>) parameterType, conv);
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}
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}
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public InteractionIdentifier provide(Object context) {
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Type type = ReflectionUtil.getMostSpecificClass(
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converter.keySet().stream().filter(x -> x.isAssignableFrom(context.getClass())).toArray(Class<?>[]::new),
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context.getClass());
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if (type == null)
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logger.debug("No Identifier converter found for context {}", context.getClass().toString());
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@SuppressWarnings("unchecked")
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Converter<Object> conv = (Converter<Object>) converter.get(type);
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return conv.convert(context);
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}
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@FunctionalInterface
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public interface Converter<T extends Object> {
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InteractionIdentifier convert(T context);
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}
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public static class LambdaWrapper<T extends Object> implements Converter<T> {
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private Converter<T> converter;
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LambdaWrapper(Converter<T> converter) {
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this.converter = converter;
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}
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@Override
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public InteractionIdentifier convert(T context) {
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return this.converter.convert(context);
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}
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}
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}
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