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102 lines
4.6 KiB
102 lines
4.6 KiB
/*
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XOWA: the XOWA Offline Wiki Application
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Copyright (C) 2012-2020 gnosygnu@gmail.com
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XOWA is licensed under the terms of the General Public License (GPL) Version 3,
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or alternatively under the terms of the Apache License Version 2.0.
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You may use XOWA according to either of these licenses as is most appropriate
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for your project on a case-by-case basis.
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The terms of each license can be found in the source code repository:
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GPLv3 License: https://github.com/gnosygnu/xowa/blob/master/LICENSE-GPLv3.txt
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Apache License: https://github.com/gnosygnu/xowa/blob/master/LICENSE-APACHE2.txt
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*/
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package gplx.xowa.guis.history;
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import gplx.Bool_;
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import gplx.Bry_;
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import gplx.Byte_ascii;
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import gplx.Ordered_hash;
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import gplx.Ordered_hash_;
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import gplx.xowa.Xoa_ttl;
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import gplx.xowa.Xoa_url;
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import gplx.xowa.Xoa_url_;
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import gplx.xowa.Xoae_page;
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import gplx.xowa.Xowe_wiki;
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public class Xog_history_mgr {
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private final Ordered_hash hash = Ordered_hash_.New_bry(); private final Xog_history_stack stack = new Xog_history_stack();
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public int Count() {return hash.Count();}
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public Xoae_page Cur_page(Xowe_wiki wiki) {return Get_or_fetch(wiki, stack.Cur_itm());}
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public Xoae_page Go_bwd(Xowe_wiki wiki) {return Go_by_dir(wiki, Bool_.N);}
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public Xoae_page Go_fwd(Xowe_wiki wiki) {return Go_by_dir(wiki, Bool_.Y);}
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public Xoae_page Go_by_dir(Xowe_wiki wiki, boolean fwd) {
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Xog_history_itm itm = fwd ? stack.Go_fwd() : stack.Go_bwd();
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if (itm == Xog_history_itm.Null) return Xoae_page.Empty;
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Xoae_page rv = Get_or_fetch(wiki, itm);
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byte[] anch_key = itm.Anch();
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rv.Url().Anch_bry_(anch_key); // must override anchor as it may be different for cached page
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rv.Html_data().Bmk_pos_(itm.Bmk_pos());
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return rv;
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}
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public void Add(Xoae_page page) {
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this.Add(page, Xog_history_mgr.new_(page));
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}
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public void Add(Xoae_page page, Xoa_url url) {
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this.Add(page, Xog_history_mgr.new_(url, page.Html_data().Bmk_pos()));
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}
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private void Add(Xoae_page page, Xog_history_itm new_itm) {
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stack.Add(new_itm);
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byte[] page_key = Build_page_key(page);
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if (!hash.Has(page_key))
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hash.Add(page_key, page);
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}
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public void Update_html_doc_pos(Xoae_page page, byte history_nav_type) {
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Xog_history_itm itm = Get_recent(page, history_nav_type);
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if (itm != null) itm.Bmk_pos_(page.Html_data().Bmk_pos());
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}
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private Xog_history_itm Get_recent(Xoae_page page, byte history_nav_type) {
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int pos = -1;
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int list_pos = stack.Cur_pos();
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switch (history_nav_type) {
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case Xog_history_stack.Nav_fwd: pos = list_pos - 1; break;
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case Xog_history_stack.Nav_bwd: pos = list_pos + 1; break;
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case Xog_history_stack.Nav_by_anchor: pos = list_pos; break;
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}
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if (pos < 0 || pos >= stack.Len()) return null;
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Xog_history_itm recent = stack.Get_at(pos);
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Xog_history_itm page_itm = Xog_history_mgr.new_(page);
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return page_itm.Eq_wo_bmk_pos(recent) ? recent : null; // check that recent page actually matches current; DATE:2014-05-10
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}
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private Xoae_page Get_or_fetch(Xowe_wiki wiki, Xog_history_itm itm) {
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byte[] page_key = Build_page_key(itm.Wiki(), itm.Page(), itm.Qarg());
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Xoae_page rv = (Xoae_page)hash.Get_by(page_key);
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if (rv != null) return rv;
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Xoa_ttl ttl = Xoa_ttl.Parse(wiki, itm.Page());
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return wiki.Data_mgr().Load_page_by_ttl(ttl);
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}
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private static byte[] Build_page_key(Xoae_page page) {return Build_page_key(page.Wiki().Domain_bry(), page.Ttl().Full_url(), page.Url().Qargs_mgr().To_bry());}
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private static byte[] Build_page_key(byte[] wiki_key, byte[] page_key, byte[] args_key) {return Bry_.Add_w_dlm(Byte_ascii.Pipe, wiki_key, page_key, args_key);}
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public static Xog_history_itm new_(Xoae_page pg) {
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byte[] wiki = pg.Wiki().Domain_bry();
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byte[] page = pg.Ttl().Full_url(); // get page_name only (no anchor; no query args)
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byte[] anch = pg.Url().Anch_bry();
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byte[] qarg = pg.Url().Qargs_mgr().To_bry();
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boolean redirect_force = pg.Url().Qargs_mgr().Match(Xoa_url_.Qarg__redirect, Xoa_url_.Qarg__redirect__no);
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String bmk_pos = pg.Html_data().Bmk_pos();
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if (bmk_pos == null) bmk_pos = Xog_history_itm.Html_doc_pos_toc; // never allow null doc_pos; set to top
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return new Xog_history_itm(wiki, page, anch, qarg, redirect_force, bmk_pos);
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}
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public static Xog_history_itm new_(Xoa_url url, String bmk_pos) {
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byte[] wiki = url.Wiki_bry();
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byte[] page = url.Page_bry();
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byte[] anch = url.Anch_bry();
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byte[] qarg = url.Qargs_mgr().To_bry();
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boolean redirect_force = url.Qargs_mgr().Match(Xoa_url_.Qarg__redirect, Xoa_url_.Qarg__redirect__no);
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if (bmk_pos == null) bmk_pos = Xog_history_itm.Html_doc_pos_toc; // never allow null doc_pos; set to top
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return new Xog_history_itm(wiki, page, anch, qarg, redirect_force, bmk_pos);
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}
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}
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