/*
* JBoss, Home of Professional Open Source.
*
* Copyright 2012 Red Hat, Inc.
*
* 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.jboss.classfilewriter.util;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.WildcardType;
/**
* Generates the contents of a Signature attribute from a java type.
* <p>
* TODO: this is all wrong, I'm to tired to read the pathetic excuse for a spec properly
*
* @author Stuart Douglas
*
*/
public class SignatureBuilder {
/**
* Generates the field signiture for a field of the given type
*
* @param type
* @return the signiture, or null if no signure is required (e.g. for Class types)
*/
public static String fieldAttribute(Type type) {
StringBuilder builder = new StringBuilder();
fieldAttribute(type, builder);
return builder.toString();
}
private static void fieldAttribute(Type type, StringBuilder builder) {
if (type instanceof Class<?>) {
classType((Class<?>) type, builder);
} else if (type instanceof ParameterizedType) {
ParameterizedType ptype = (ParameterizedType) type;
parametizedType(ptype, builder);
} else if (type instanceof WildcardType) {
WildcardType ptype = (WildcardType) type;
wildcardType(ptype, builder);
}
}
private static void wildcardType(WildcardType type, StringBuilder builder) {
// WRONG
builder.append('*');
}
public static void parametizedType(ParameterizedType type, StringBuilder builder) {
fieldAttribute(type.getRawType(), builder); //write the owner type
//now write the type arguments
builder.append('<');
for(Type t : type.getActualTypeArguments()) {
fieldAttribute(t, builder);
builder.append(';');
}
builder.append(">;");
}
private static void classType(Class<?> clazz, StringBuilder builder) {
if (clazz.isMemberClass()) {
classType(clazz.getDeclaringClass(), builder);
builder.append('.');
builder.append(clazz.getSimpleName());
} else {
builder.append("L");
builder.append(clazz.getName().replace('.', '/'));
}
}
private SignatureBuilder() {
}
}