/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.drill.exec.compile.sig;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Iterator;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterators;
import com.thoughtworks.paranamer.AnnotationParanamer;
import com.thoughtworks.paranamer.Paranamer;
public class CodeGeneratorMethod implements Iterable<CodeGeneratorArgument> {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(CodeGeneratorMethod.class);
private final String methodName;
private final Class<?> returnType;
private final CodeGeneratorArgument[] arguments;
private final Class<?>[] exs;
private final Method underlyingMethod;
public CodeGeneratorMethod(String name, Class<?> returnType) {
this.methodName = name;
this.returnType = returnType;
this.exs = new Class<?>[0];
this.underlyingMethod = null;
this.arguments = new CodeGeneratorArgument[0];
}
public CodeGeneratorMethod(Method m) {
this.underlyingMethod = m;
this.methodName = m.getName();
this.returnType = m.getReturnType();
// Paranamer para = new BytecodeReadingParanamer();
Paranamer para = new AnnotationParanamer();
String[] parameterNames = para.lookupParameterNames(m, true);
if (parameterNames == null) {
throw new RuntimeException(String.format("Unable to read the parameter names for method %s. This is likely due to the class files not including the appropriate debugging information. Look up java -g for more information.", m));
}
Class<?>[] types = m.getParameterTypes();
if (parameterNames.length != types.length) {
throw new RuntimeException(String.format("Unexpected number of parameter names %s. Expected %s on method %s.", Arrays.toString(parameterNames), Arrays.toString(types), m.toGenericString()));
}
arguments = new CodeGeneratorArgument[parameterNames.length];
for (int i = 0 ; i < parameterNames.length; i++) {
arguments[i] = new CodeGeneratorArgument(parameterNames[i], types[i]);
}
exs = m.getExceptionTypes();
}
public String getMethodName() {
return methodName;
}
public Class<?> getReturnType() {
return returnType;
}
public Iterable<Class<?>> getThrowsIterable() {
return ImmutableList.copyOf(exs);
}
@Override
public Iterator<CodeGeneratorArgument> iterator() {
return Iterators.forArray(arguments);
}
@Override
public String toString() {
return "CodeGeneratorMethod [" + underlyingMethod.toGenericString() + "]";
}
}