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/****************************************************************************
 *
 * File:            MapCommon.java
 *
 * Description:     PDFTOOLS internal classes of map implementations.
 *
 * Author:          PDF Tools AG
 * 
 * Copyright:       Copyright (C) 2023 - 2024 PDF Tools AG, Switzerland
 *                  All rights reserved.
 * 
 * Notice:          By downloading and using this artifact, you accept PDF Tools AG's
 *                  [license agreement](https://www.pdf-tools.com/license-agreement/),
 *                  [privacy policy](https://www.pdf-tools.com/privacy-policy/),
 *                  and allow PDF Tools AG to track your usage data.
 *
 ***************************************************************************/

package com.pdftools.sign;

import java.util.AbstractCollection;
import java.util.AbstractSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

/**
 * @hidden
 * In Java, the file name should be always the same as a class name.
 * This dummy class is to fulfill that requirement because some tools, e.g. javadoc, cannot process the file otherwise.
 */
class MapCommon
{}

class KeySet extends AbstractSet
{
    public KeySet(Map map)
    {
        this.map = map;
    }

    @Override
    public boolean remove(Object o)
    {
        return map.remove(o) != null;
    }

    @Override
    public void clear()
    {
        map.clear();
    }

    @Override
    public boolean contains(Object object)
    {
        return map.containsKey(object);
    }

    @Override
    public Iterator iterator()
    {
        return new KeyIterator(map.entrySet().iterator());
    }

    @Override
    public int size()
    {
        return map.size();
    }

    private Map map;
}

class ValueCollection extends AbstractCollection
{
    public ValueCollection(Map map)
    {
        this.map = map;
    }

    @Override
    public Iterator iterator()
    {
        return new ValueIterator(map.entrySet().iterator());
    }

    @Override
    public int size()
    {
        return map.size();
    }

    private Map map;
}

abstract class ProxyIterator implements Iterator
{
    public ProxyIterator(Iterator it)
    {
        this.it = it;
    }

    @Override
    public boolean hasNext() {
        return it.hasNext();
    }

    @Override
    public void remove()
    {
        it.remove();
    }

    Iterator it;
}

class KeyIterator extends ProxyIterator>
{
    public KeyIterator(Iterator> it)
    {
        super(it);
    }

    @Override
    public K next()
    {
        return it.next().getKey();
    }
}

class ValueIterator extends ProxyIterator>
{

    public ValueIterator(Iterator> it)
    {
        super(it);
    }

    @Override
    public V next()
    {
        return it.next().getValue();
    }
}