/*
 * The MIT License
 *
 * Copyright (c) 2010, InfraDNA, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.infradna.tool.bridge_method_injector;

import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

/**
 * Adds class annotations.
 *
 * @author Kohsuke Kawaguchi
 */
abstract class ClassAnnotationInjector extends ClassVisitor {
    ClassAnnotationInjector(ClassVisitor cv) {
        super(Opcodes.ASM5, cv);
    }

    private boolean emitted = false;

    private void maybeEmit() {
        if (!emitted) {
            emitted = true;
            emit();
        }
    }

    protected abstract void emit();

    @Override
    public void visitInnerClass(String name, String outerName, String innerName, int access) {
        maybeEmit();
        super.visitInnerClass(name, outerName, innerName, access);
    }

    @Override
    public FieldVisitor visitField(int access, String name, String desc, String signature, Object value) {
        maybeEmit();
        return super.visitField(access, name, desc, signature, value);
    }

    @Override
    public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
        maybeEmit();
        return super.visitMethod(access, name, desc, signature, exceptions);
    }

    @Override
    public void visitEnd() {
        maybeEmit();
        super.visitEnd();
    }
}
