/*
* Copyright 2017-2020 original 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
*
* https://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 io.micronaut.context.exceptions;
import io.micronaut.inject.BeanDefinition;
import java.util.Iterator;
Exception thrown when a bean is not unique and has multiple possible implementations for a given bean type.
Author: Graeme Rocher Since: 1.0
/**
* Exception thrown when a bean is not unique and has multiple possible implementations for a given bean type.
*
* @author Graeme Rocher
* @since 1.0
*/
public class NonUniqueBeanException extends NoSuchBeanException {
private final Class targetType;
private final Iterator possibleCandidates;
Params: - targetType – The target type
- candidates – The bean definition candidates
Type parameters: - <T> – The type
/**
* @param targetType The target type
* @param candidates The bean definition candidates
* @param <T> The type
*/
public <T> NonUniqueBeanException(Class targetType, Iterator<BeanDefinition<T>> candidates) {
super(buildMessage(candidates));
this.targetType = targetType;
this.possibleCandidates = candidates;
}
Type parameters: - <T> – The type
Returns: The possible bean candidates
/**
* @param <T> The type
* @return The possible bean candidates
*/
public <T> Iterator<BeanDefinition<T>> getPossibleCandidates() {
return possibleCandidates;
}
Type parameters: - <T> – The type
Returns: The bean type requested
/**
* @param <T> The type
* @return The bean type requested
*/
public <T> Class<T> getBeanType() {
return targetType;
}
private static <T> String buildMessage(Iterator<BeanDefinition<T>> possibleCandidates) {
final StringBuilder message = new StringBuilder("Multiple possible bean candidates found: [");
while (possibleCandidates.hasNext()) {
Class next = possibleCandidates.next().getBeanType();
message.append(next.getName());
if (possibleCandidates.hasNext()) {
message.append(", ");
}
}
message.append("]");
return message.toString();
}
}