/*
* Copyright 2003-2007 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
*
* 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.codehaus.groovy.runtime.metaclass;
import groovy.lang.GroovyRuntimeException;
import groovy.lang.MetaMethod;
import org.codehaus.groovy.reflection.CachedConstructor;
import org.codehaus.groovy.reflection.FastArray;
import java.lang.reflect.Modifier;
/**
* This exception is thrown if the runtime is unable to select
* a method. This class builds the exception text when calling
* getMessage. <br/>
* <b>Note:</b> This exception as for internal use only!
*
* @author Jochen Theodorou
* @since Groovy 1.1
*/
public class MethodSelectionException extends GroovyRuntimeException {
private String methodName;
private FastArray methods;
private Class[] arguments;
/**
* Creates a new MethodSelectionException.
* @param methodName name of the method
* @param methods a FastArray of methods
* @param arguments the method call argument classes
*/
public MethodSelectionException(String methodName, FastArray methods, Class[] arguments) {
super(methodName);
this.methodName = methodName;
this.arguments = arguments;
this.methods = methods;
}
public String getMessage() {
StringBuffer buffer = new StringBuffer();
buffer.append("Could not find which method ").append(methodName);
appendClassNames(buffer,arguments);
buffer.append(" to invoke from this list:");
appendMethods(buffer);
return buffer.toString();
}
private void appendClassNames(StringBuffer argBuf, Class[] classes) {
argBuf.append("(");
for (int i = 0; i < classes.length; i++) {
if (i > 0) {
argBuf.append(", ");
}
Class clazz = classes[i];
String name = clazz==null? "null": clazz.getName();
argBuf.append(name);
}
argBuf.append(")");
}
private void appendMethods(StringBuffer buffer) {
for (int i = 0; i < methods.size; i++) {
buffer.append("\n ");
Object methodOrConstructor = methods.get(i);
if (methodOrConstructor instanceof MetaMethod) {
MetaMethod method = (MetaMethod) methodOrConstructor;
buffer.append(Modifier.toString(method.getModifiers()));
buffer.append(" ").append(method.getReturnType().getName());
buffer.append(" ").append(method.getDeclaringClass().getName());
buffer.append("#");
buffer.append(method.getName());
appendClassNames(buffer,method.getNativeParameterTypes());
}
else {
CachedConstructor method = (CachedConstructor) methodOrConstructor;
buffer.append(Modifier.toString(method.cachedConstructor.getModifiers()));
buffer.append(" ").append(method.cachedConstructor.getDeclaringClass().getName());
buffer.append("#<init>");
appendClassNames(buffer,method.getNativeParameterTypes());
}
}
}
}