org.apache.aries.proxy.impl.weaving.SyntheticSerialVerUIDAdder.java Source code

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Here is the source code for org.apache.aries.proxy.impl.weaving.SyntheticSerialVerUIDAdder.java

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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.aries.proxy.impl.weaving;

import java.lang.reflect.Modifier;

import static org.objectweb.asm.Opcodes.ASM5;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.commons.SerialVersionUIDAdder;

class SyntheticSerialVerUIDAdder extends SerialVersionUIDAdder {

    private WovenProxyAdapter wpa;

    //copied from superclass, they are now private
    /**
     * Flag that indicates if we need to compute SVUID.
     */
    private boolean computeSVUID;

    /**
     * Set to true if the class already has SVUID.
     */
    private boolean hasSVUID;

    public SyntheticSerialVerUIDAdder(WovenProxyAdapter cv) {
        super(ASM5, cv);
        wpa = cv;
    }

    // The following visit and visitField methods are workaround since ASM4 does not supply the javadoced method isHasSVUID() by mistake. 
    // When the method isHasSVUId() or similar methods available, we can remove the following two methods.

    @Override
    public void visit(final int version, final int access, final String name, final String signature,
            final String superName, final String[] interfaces) {
        computeSVUID = (access & Opcodes.ACC_INTERFACE) == 0;
        super.visit(version, access, name, signature, superName, interfaces);
    }

    @Override
    public FieldVisitor visitField(final int access, final String name, final String desc, final String signature,
            final Object value) {
        if (computeSVUID) {
            if ("serialVersionUID".equals(name) && Modifier.isFinal(access) && Modifier.isStatic(access)
                    && Type.LONG_TYPE.equals(Type.getType(desc))) {
                // since the class already has SVUID, we won't be computing it.
                computeSVUID = false;
                hasSVUID = true;
            }
        }

        return super.visitField(access, name, desc, signature, value);
    }

    @Override
    public void visitEnd() {

        wpa.setSVUIDGenerated(!!!hasSVUID);
        super.visitEnd();
    }
}