org.apache.aries.spifly.statictool.StaticToolClassWriter Maven / Gradle / Ivy
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This tool does the weaving to support SPI ServiceLoader statically.
/*
* 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.aries.spifly.statictool;
import org.objectweb.asm.ClassWriter;
/**
* We need to override ASM's default behaviour in
* {@link #getCommonSuperClass(String, String)} so that it accepts a custom
* classloader that can also see the jar that is being processed.
*/
public final class StaticToolClassWriter extends ClassWriter {
private static final String OBJECT_INTERNAL_NAME = "java/lang/Object";
private final ClassLoader loader;
public StaticToolClassWriter(int flags, ClassLoader loader) {
super(flags);
this.loader = loader;
}
/**
* The implementation uses the classloader provided using the Constructor.
*
* This is a slight variation on ASM's default behaviour as that obtains the
* classloader to use ASMs classloader.
*/
@Override
protected String getCommonSuperClass(final String type1, final String type2) {
Class c, d;
try {
c = Class.forName(type1.replace('/', '.'), false, loader);
d = Class.forName(type2.replace('/', '.'), false, loader);
} catch (Exception e) {
throw new RuntimeException(e);
}
if (c.isAssignableFrom(d)) {
return type1;
}
if (d.isAssignableFrom(c)) {
return type2;
}
if (c.isInterface() || d.isInterface()) {
return OBJECT_INTERNAL_NAME;
}
do {
c = c.getSuperclass();
} while (!c.isAssignableFrom(d));
return c.getName().replace('.', '/');
}
}