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package io.dico.dicore.command.parameter.type;
import java.lang.annotation.Annotation;
import java.util.HashMap;
import java.util.Map;
/**
* Map based implementation of {@link IParameterTypeSelector}
*/
public class MapBasedParameterTypeSelector implements IParameterTypeSelector {
static final MapBasedParameterTypeSelector defaultSelector = new MapBasedParameterTypeSelector(false);
private final Map<ParameterKey, ParameterType<?, ?>> parameterTypeMap;
private final boolean useDefault;
public MapBasedParameterTypeSelector(boolean useDefault) {
this.parameterTypeMap = new HashMap<>();
this.useDefault = useDefault;
}
@Override
public <TReturn, TParamInfo> ParameterType<TReturn, TParamInfo> selectExact(ParameterKey key) {
ParameterType<?, ?> out = parameterTypeMap.get(key);
if (useDefault && out == null) {
out = defaultSelector.selectExact(key);
}
if (out == null && key.getReturnType().isEnum()) {
//noinspection unchecked
out = new EnumParameterType(key.getReturnType());
addType(false, out);
}
return cast(out);
}
@Override
public <TReturn, TParamInfo> ParameterType<TReturn, TParamInfo> selectAny(ParameterKey key) {
ParameterType<TReturn, TParamInfo> exact = selectExact(key);
if (exact != null) {
return exact;
}
if (key.getAnnotationClass() != null) {
exact = selectExact(new ParameterKey(key.getReturnType()));
if (exact != null) {
return exact;
}
}
Class<?> returnType = key.getReturnType();
Class<? extends Annotation> annotationClass = key.getAnnotationClass();
ParameterType<?, ?> out = selectByReturnType(parameterTypeMap, returnType, annotationClass, false);
if (out == null && useDefault) {
out = selectByReturnType(defaultSelector.parameterTypeMap, returnType, annotationClass, false);
}
if (out == null) {
out = selectByReturnType(parameterTypeMap, returnType, annotationClass, true);
}
if (out == null && useDefault) {
out = selectByReturnType(defaultSelector.parameterTypeMap, returnType, annotationClass, true);
}
return cast(out);
}
private static ParameterType<?, ?> selectByReturnType(Map<ParameterKey, ParameterType<?, ?>> map, Class<?> returnType,
Class<? extends Annotation> annotationClass, boolean allowSubclass) {
ParameterType<?, ?> out = null;
if (allowSubclass) {
for (ParameterType<?, ?> type : map.values()) {
if (returnType.isAssignableFrom(type.getReturnType())) {
if (annotationClass == type.getAnnotationClass()) {
out = type;
break;
}
if (out == null) {
out = type;
}
}
}
} else {
for (ParameterType<?, ?> type : map.values()) {
if (returnType == type.getReturnType()) {
if (annotationClass == type.getAnnotationClass()) {
out = type;
break;
}
if (out == null) {
out = type;
}
}
}
}
return out;
}
private static <T> T cast(Object o) {
//noinspection unchecked
return (T) o;
}
@Override
public void addType(boolean infolessAlias, ParameterType<?, ?> type) {
parameterTypeMap.put(type.getTypeKey(), type);
if (infolessAlias) {
parameterTypeMap.putIfAbsent(type.getInfolessTypeKey(), type);
}
}
static {
// registers default parameter types
ParameterTypes.clinit();
}
}
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