/*
* JBoss, Home of Professional Open Source
* Copyright 2010, Red Hat Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
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() {
}
}