org.apache.openjpa.util.asm.ClassNodeTracker Maven / Gradle / Ivy

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/*
 * 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.openjpa.util.asm;

import java.util.ArrayList;

import org.apache.xbean.asm9.Type;
import org.apache.xbean.asm9.tree.ClassNode;

/**
 * Helper class to transit from BCClass to ASM
 *
 * @author Mark Struberg
 */
public class ClassNodeTracker {
    private ClassNode classNode;
    private final ClassLoader cl;
    private final EnhancementProject project;

    public ClassNodeTracker(EnhancementProject project, ClassNode classNode, ClassLoader cl) {
        this.project = project;
        this.classNode = classNode;
        if (hasEnhancementCl(cl)) {
            this.cl = cl;
        }
        else {
            this.cl = new EnhancementClassLoader(project, cl);
        }
        project.putClass(classNode.name.replace("/", "."), this);
    }

    private boolean hasEnhancementCl(ClassLoader cl) {
        boolean hasEhCl = false;
        do {
            if (cl instanceof EnhancementClassLoader) {
                hasEhCl = true;
                break;
            }
            cl = cl.getParent();
        } while (cl != null);

        return hasEhCl;
    }

    public ClassNode getClassNode() {
        return classNode;
    }

    public void setClassNode(ClassNode classNode) {
        this.classNode = classNode;
    }

    public ClassLoader getClassLoader() {
        return cl;
    }

    public EnhancementProject getProject() {
        return project;
    }

    public Class getType() {
        try {
            return Class.forName(classNode.name.replace("/", "."), false, cl);
        }
        catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        }
    }

    public void declareInterface(Class iface) {
        if (classNode.interfaces == null) {
            classNode.interfaces = new ArrayList<>();
        }
        classNode.interfaces.add(Type.getInternalName(iface));
    }
}