org.springframework.boot.actuate.endpoint.invoke.reflect.OperationMethodParameters Maven / Gradle / Ivy
/*
* Copyright 2012-2018 the original author or 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 org.springframework.boot.actuate.endpoint.invoke.reflect;
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.stream.Stream;
import org.springframework.boot.actuate.endpoint.invoke.OperationParameter;
import org.springframework.boot.actuate.endpoint.invoke.OperationParameters;
import org.springframework.core.ParameterNameDiscoverer;
import org.springframework.util.Assert;
/**
* {@link OperationParameters} created from an {@link OperationMethod}.
*
* @author Phillip Webb
*/
class OperationMethodParameters implements OperationParameters {
private final List operationParameters;
/**
* Create a new {@link OperationMethodParameters} instance.
* @param method the source method
* @param parameterNameDiscoverer the parameter name discoverer
*/
OperationMethodParameters(Method method,
ParameterNameDiscoverer parameterNameDiscoverer) {
Assert.notNull(method, "Method must not be null");
Assert.notNull(parameterNameDiscoverer,
"ParameterNameDiscoverer must not be null");
String[] parameterNames = parameterNameDiscoverer.getParameterNames(method);
Parameter[] parameters = method.getParameters();
Assert.state(parameterNames != null,
() -> "Failed to extract parameter names for " + method);
this.operationParameters = getOperationParameters(parameters, parameterNames);
}
private List getOperationParameters(Parameter[] parameters,
String[] names) {
List operationParameters = new ArrayList<>(parameters.length);
for (int i = 0; i < names.length; i++) {
operationParameters
.add(new OperationMethodParameter(names[i], parameters[i]));
}
return Collections.unmodifiableList(operationParameters);
}
@Override
public int getParameterCount() {
return this.operationParameters.size();
}
@Override
public OperationParameter get(int index) {
return this.operationParameters.get(index);
}
@Override
public Iterator iterator() {
return this.operationParameters.iterator();
}
@Override
public Stream stream() {
return this.operationParameters.stream();
}
}