import com.sun.mirror.type.VoidType; //导入依赖的package包/类
@Override
public void visitMethodDeclaration(MethodDeclaration methodDeclaration) {

    ERROR_PREFIX = methodDeclaration.getSimpleName() + ERROR_PREFIX_STATIC;

    // return type must be void
    if (!(methodDeclaration.getReturnType() instanceof VoidType))
        reportError(methodDeclaration,
                "the method shouldn't have any return value, but instead returns " +
                    methodDeclaration.getReturnType().toString());

    // method must not have arguments
    if (!methodDeclaration.getParameters().isEmpty())
        reportError(methodDeclaration, "the method accepts parameters");

}
 

import com.sun.mirror.type.VoidType; //导入依赖的package包/类
@Override
public void visitMethodDeclaration(MethodDeclaration methodDeclaration) {
    boolean correctSignature = false;
    Collection<ParameterDeclaration> methodParams = methodDeclaration.getParameters();
    // return type must be void
    if (methodDeclaration.getReturnType() instanceof VoidType && methodParams.size() == 2) {
        Iterator<ParameterDeclaration> it = methodParams.iterator();
        ParameterDeclaration param = it.next();
        ParameterDeclaration param2 = it.next();

        if (param.getType().toString().equals(Node.class.getName()) &&
            param2.getType().toString().equals(String.class.getName())) {
            correctSignature = true;
        }
    }

    if (!correctSignature) {
        reportError(methodDeclaration,
                ErrorMessages.INCORRECT_METHOD_SIGNATURE_FOR_NODE_ATTACHEMENT_CALLBACK);
    }
}
 

import com.sun.mirror.type.VoidType; //导入依赖的package包/类
@Override
public void visitMethodDeclaration(MethodDeclaration methodDeclaration) {

    boolean correctSignature = false;
    Collection<ParameterDeclaration> methodParams = methodDeclaration.getParameters();
    // return type must be void
    if (methodDeclaration.getReturnType() instanceof VoidType && methodParams.size() == 1) {
        Iterator<ParameterDeclaration> it = methodParams.iterator();
        ParameterDeclaration param = it.next();

        if (param.getType().toString().equals(String.class.getName())) {
            correctSignature = true;
        }
    }

    if (!correctSignature) {
        reportError(methodDeclaration, ErrorMessages.INCORRECT_METHOD_SIGNATURE_FOR_ISREADY_CALLBACK);
    }
}
 

import com.sun.mirror.type.VoidType; //导入依赖的package包/类
protected TypeMirror onVoidType(VoidType type, TypeDeclaration param) {
    return type;
}
 

import com.sun.mirror.type.VoidType; //导入依赖的package包/类
protected abstract T onVoidType(VoidType type, P param);