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package org.openslx.util;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
public class TimeoutHashMap<K, V> implements Map<K, V>
{
private final Map<K, TimeoutReference<V>> map;
private final long timeout;
public TimeoutHashMap( long timeout )
{
this.map = new HashMap<>();
this.timeout = timeout;
}
@Override
public int size()
{
return map.size();
}
@Override
public boolean isEmpty()
{
return map.isEmpty();
}
@Override
public boolean containsKey( Object key )
{
return map.containsKey( key );
}
@Override
public boolean containsValue( Object value )
{
return map.containsValue( value );
}
@Override
public V get( Object key )
{
TimeoutReference<V> timeoutReference = map.get( key );
if ( timeoutReference == null )
return null;
V obj = timeoutReference.get();
if ( obj == null && timeoutReference.isInvalid() ) {
map.remove( key );
}
return obj;
}
@Override
public V put( K key, V value )
{
map.put( key, new TimeoutReference<V>(
false, timeout, value ) );
return value;
}
@Override
public V remove( Object key )
{
TimeoutReference<V> remove = map.remove( key );
if ( remove == null )
return null;
return remove.get();
}
@Override
public void putAll( Map<? extends K, ? extends V> m )
{
for ( java.util.Map.Entry<? extends K, ? extends V> entry : m.entrySet() ) {
put( entry.getKey(), entry.getValue() );
}
}
@Override
public void clear()
{
map.clear();
}
@Override
public Set<K> keySet()
{
return map.keySet();
}
public Map<K, V> getImmutableSnapshot()
{
Map<K, V> copy = new HashMap<>();
for (Entry<K, TimeoutReference<V>> i : map.entrySet()) {
V v = i.getValue().get();
if (i.getValue().isInvalid())
continue;
copy.put(i.getKey(), v);
}
return Collections.unmodifiableMap( copy );
}
@Override
public Collection<V> values()
{
throw new UnsupportedOperationException();
}
@Override
public Set<java.util.Map.Entry<K, V>> entrySet()
{
throw new UnsupportedOperationException();
}
}
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