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/*
* Copyright (C) 2012 The Guava Authors
*
* 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 com.google.common.reflect;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.Beta;
import com.google.common.collect.ImmutableList;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import javax.annotation.Nullable;
/**
* Represents a method or constructor parameter.
*
* @author Ben Yu
* @since 14.0
*/
@Beta
public final class Parameter implements AnnotatedElement {
private final Invokable<?, ?> declaration;
private final int position;
private final TypeToken<?> type;
private final ImmutableList<Annotation> annotations;
Parameter(
Invokable<?, ?> declaration,
int position,
TypeToken<?> type,
Annotation[] annotations) {
this.declaration = declaration;
this.position = position;
this.type = type;
this.annotations = ImmutableList.copyOf(annotations);
}
/** Returns the type of the parameter. */
public TypeToken<?> getType() {
return type;
}
/** Returns the {@link Invokable} that declares this parameter. */
public Invokable<?, ?> getDeclaringInvokable() {
return declaration;
}
@Override public boolean isAnnotationPresent(Class<? extends Annotation> annotationType) {
return getAnnotation(annotationType) != null;
}
@Override
@Nullable
public <A extends Annotation> A getAnnotation(Class<A> annotationType) {
checkNotNull(annotationType);
for (Annotation annotation : annotations) {
if (annotationType.isInstance(annotation)) {
return annotationType.cast(annotation);
}
}
return null;
}
@Override public Annotation[] getAnnotations() {
return getDeclaredAnnotations();
}
@Override public Annotation[] getDeclaredAnnotations() {
return annotations.toArray(new Annotation[annotations.size()]);
}
@Override public boolean equals(@Nullable Object obj) {
if (obj instanceof Parameter) {
Parameter that = (Parameter) obj;
return position == that.position && declaration.equals(that.declaration);
}
return false;
}
@Override public int hashCode() {
return position;
}
@Override public String toString() {
return type + " arg" + position;
}
}
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