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package com.google.inject.spi;

import com.google.inject.Binding;

/**
 * No-op visitor for subclassing. All interface methods simply delegate to {@link
 * #visitOther(Binding)}, returning its result.
 *
 * @param  any type to be returned by the visit method. Use {@link Void} with
 *            {@code return null} if no return type is needed.
 */
public abstract class DefaultBindingTargetVisitor implements BindingTargetVisitor {

    /**
     * Default visit implementation. Returns {@code null}.
     */
    protected V visitOther(Binding binding) {
        return null;
    }

    @Override
    public V visit(InstanceBinding instanceBinding) {
        return visitOther(instanceBinding);
    }

    @Override
    public V visit(ProviderInstanceBinding providerInstanceBinding) {
        return visitOther(providerInstanceBinding);
    }

    @Override
    public V visit(ProviderKeyBinding providerKeyBinding) {
        return visitOther(providerKeyBinding);
    }

    @Override
    public V visit(LinkedKeyBinding linkedKeyBinding) {
        return visitOther(linkedKeyBinding);
    }

    @Override
    public V visit(ExposedBinding exposedBinding) {
        return visitOther(exposedBinding);
    }

    @Override
    public V visit(UntargettedBinding untargettedBinding) {
        return visitOther(untargettedBinding);
    }

    @Override
    public V visit(ConstructorBinding constructorBinding) {
        return visitOther(constructorBinding);
    }

    @Override
    public V visit(ConvertedConstantBinding convertedConstantBinding) {
        return visitOther(convertedConstantBinding);
    }

    @Override
    public V visit(ProviderBinding providerBinding) {
        return visitOther(providerBinding);
    }
}