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/**
* Copyright (c) Rich Hickey. All rights reserved.
* The use and distribution terms for this software are covered by the
* Common Public License 1.0 (http://opensource.org/licenses/cpl.php)
* which can be found in the file CPL.TXT at the root of this distribution.
* By using this software in any fashion, you are agreeing to be bound by
* the terms of this license.
* You must not remove this notice, or any other, from this software.
**/
using System;
namespace clojure.lang
{
public abstract class ASeq : Obj, ISeq{
int _hash = -1;
public override Obj withMeta(IPersistentMap meta)
{
if(_meta == meta)
return this;
Obj ret = (Obj)MemberwiseClone();
ret._meta = meta;
return ret;
}
override public bool Equals(Object obj) {
if(!(obj is Sequential))
return false;
for(ISeq s = seq(), ms = ((IPersistentCollection)obj).seq();s!=null;s = s.rest(), ms = ms.rest())
{
if(ms == null || !RT.equal(s.first(),ms.first()))
return false;
}
return true;
}
override public int GetHashCode() {
if(_hash == -1)
{
int hash = 0;
for(ISeq s = seq();s!=null;s = s.rest())
{
hash = RT.hashCombine(hash, RT.hash(s.first()));
}
this._hash = hash;
}
return _hash;
}
public virtual Object peek() {
return first();
}
public virtual IPersistentList pop() {
return rest();
}
public virtual int count() {
return 1 + RT.count(rest());
}
public virtual ISeq seq() {
return this;
}
public virtual IPersistentCollection cons(Object o) {
return new Cons(o, this);
}
#region ISeq Members
abstract public object first();
abstract public ISeq rest();
#endregion
}
}
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