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/*
* Copyright (C) 2007-2008, Jeff Thompson
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Collections;
using System.Collections.Generic;
namespace OpenSim.Region.ScriptEngine.Shared.YieldProlog
{
/// <summary>
/// A FindallAnswers holds answers for findall.
/// </summary>
public class FindallAnswers
{
private object _template;
private List<object> _bagArray;
public FindallAnswers(object Template)
{
_template = Template;
_bagArray = new List<object>();
}
public void add()
{
_bagArray.Add(YP.makeCopy(_template, new Variable.CopyStore()));
}
public List<object> resultArray()
{
return _bagArray;
}
/// <summary>
/// Unify Bag with the result. This frees the internal answers, so you can only call this once.
/// </summary>
/// <param name="Bag"></param>
/// <returns></returns>
public IEnumerable<bool> result(object Bag)
{
object result = ListPair.make(_bagArray);
// Try to free the memory.
_bagArray = null;
return YP.unify(Bag, result);
}
/// <summary>
/// This is a simplified findall when the goal is a single call.
/// </summary>
/// <param name="Template"></param>
/// <param name="goal"></param>
/// <param name="Bag"></param>
/// <returns></returns>
public static IEnumerable<bool> findall(object Template, IEnumerable<bool> goal, object Bag)
{
FindallAnswers findallAnswers = new FindallAnswers(Template);
// disable warning on l1, don't see how we can
// code this differently
#pragma warning disable 0168
foreach (bool l1 in goal)
findallAnswers.add();
#pragma warning restore 0168
return findallAnswers.result(Bag);
}
/// <summary>
/// Like findall, except return an array of the results.
/// </summary>
/// <param name="template"></param>
/// <param name="goal"></param>
/// <returns></returns>
public static List<object> findallArray(object Template, IEnumerable<bool> goal)
{
FindallAnswers findallAnswers = new FindallAnswers(Template);
// disable warning on l1, don't see how we can
// code this differently
#pragma warning disable 0168
foreach (bool l1 in goal)
findallAnswers.add();
#pragma warning restore 0168
return findallAnswers.resultArray();
}
}
}
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