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/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.config.spring;

import com.google.common.collect.ImmutableList;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

/**
 * Default implementation of {@link OptionalObjectsController}
 *
 * @since 3.7.0
 */
public class DefaultOptionalObjectsController implements OptionalObjectsController
{

    private final Set optionalKeys = new HashSet<>();
    private final Set discardedKeys = new HashSet<>();
    private final Object discardedObjectPlaceholder = new Object();



    @Override
    public void registerOptionalKey(String key)
    {
        optionalKeys.add(key);
    }

    @Override
    public void discardOptionalObject(String key)
    {
        discardedKeys.add(key);
    }

    @Override
    public boolean isOptional(String key)
    {
        return optionalKeys.contains(key);
    }

    @Override
    public boolean isDiscarded(String key)
    {
        return discardedKeys.contains(key);
    }

    @Override
    public Object getDiscardedObjectPlaceholder()
    {
        return discardedObjectPlaceholder;
    }

    @Override
    public Collection getAllOptionalKeys()
    {
        return ImmutableList.copyOf(optionalKeys);
    }
}