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InstanceFactory.java
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InstanceFactory.java
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/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jdbi.v3.core.mapper.reflect;
import java.lang.annotation.Annotation;
import java.lang.reflect.Executable;
import java.lang.reflect.Parameter;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.stream.Stream;
import jakarta.annotation.Nullable;
import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.toUnmodifiableList;
abstract class InstanceFactory<T> {
private final Executable executable;
protected InstanceFactory(Executable executable) {
this.executable = requireNonNull(executable, "executable is null");
}
Class<?> getDeclaringClass() {
return executable.getDeclaringClass();
}
int getParameterCount() {
return executable.getParameterCount();
}
Parameter[] getParameters() {
return executable.getParameters();
}
List<Type> getTypes() {
return Arrays.stream(getParameters())
.map(Parameter::getParameterizedType)
.collect(toUnmodifiableList());
}
@Nullable
<A extends Annotation> A getAnnotation(Class<A> annotationClass) {
return executable.getAnnotation(annotationClass);
}
@Nullable
<A extends Annotation> A getAnnotationIncludingType(Class<A> annotationClass) {
return Stream.of(
getAnnotation(annotationClass),
executable.getDeclaringClass().getAnnotation(annotationClass))
.filter(Objects::nonNull)
.findFirst()
.orElse(null);
}
abstract T newInstance(Object... params);
@Override
public abstract String toString();
}