package luan;

import java.util.Map;
import java.util.Set;
import java.util.Collection;
import java.util.Collections;
import java.util.IdentityHashMap;


public final class LuanImmutabler {
	private final Set handled = Collections.newSetFromMap(new IdentityHashMap());
	private Luan luan = null;

	public void makeImmutable(LuanCloneable obj) throws LuanException {
		if( obj==null || !handled.add(obj) )
			return;
		if( obj instanceof Luan ) {
			if( luan != null )
				throw new RuntimeException("2 luans in "+this+" - "+luan+" "+obj);
			luan = (Luan)obj;
		}
		obj.makeImmutable(this);
	}

	public void makeImmutable(Object[] obj) throws LuanException {
		if( obj==null || !handled.add(obj) )
			return;
		for( Object entry : obj ) {
			makeImmutable(entry);
		}
	}

	public void makeImmutable(Map obj) throws LuanException {
		if( obj==null || !handled.add(obj) )
			return;
		for( Object stupid : obj.entrySet() ) {
			Map.Entry entry = (Map.Entry)stupid;
			makeImmutable(entry.getKey());
			makeImmutable(entry.getValue());
		}
	}

	public void makeImmutable(Collection obj) throws LuanException {
		if( obj==null || !handled.add(obj) )
			return;
		for( Object entry : (Collection)obj ) {
			makeImmutable(entry);
		}
	}

	public void makeImmutable(Object obj) throws LuanException {
		if( obj instanceof LuanCloneable )
			makeImmutable((LuanCloneable)obj);
		else if( obj instanceof Object[] )
			makeImmutable((Object[])obj);
		else if( obj instanceof Map )
			makeImmutable((Map)obj);
		else if( obj instanceof Collection )
			makeImmutable((Collection)obj);
	}
}