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78 lines
3.2 KiB
78 lines
3.2 KiB
/*
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XOWA: the XOWA Offline Wiki Application
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Copyright (C) 2012 gnosygnu@gmail.com
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package gplx.gfml; import gplx.*;
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class IntObjHash_base {
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public int Count() {return count;} int count;
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public boolean Has(int key) {return Get_by(key) != null;}
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public Object Get_by(int key) {
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if (key < 0) throw Err_.new_wo_type("key must be >= 0", "key", key);
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if (key > maxKey) return null;
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Object[] subAry = FetchSubAry(key);
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return subAry == null ? null : subAry[subIdx];
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}
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public void Add(int key, Object obj) {PutObjAtKey(key, obj, true);}
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public void Set(int key, Object obj) {PutObjAtKey(key, obj, false);}
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public void Del(int key) {
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if (key > maxKey) return; // key does not exist; exit
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Object[] subAry = FetchSubAry(key);
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if (subAry == null) return;
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subAry[subIdx] = null;
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count--;
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}
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public void Clear() {
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rootAry = new Object[0];
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count = 0;
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maxKey = -1;
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}
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void PutObjAtKey(int key, Object obj, boolean isAdd) {
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if (key < 0) throw Err_.new_wo_type("key must be >= 0", "key", key);
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if (obj == null) throw Err_.new_wo_type("Object cannot be null; call .Del on key instead", "key", key);
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if (key > maxKey) ExpandRootAry(key);
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Object[] subAry = FetchSubAry(key);
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if (subAry == null) {
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subAry = new Object[subAryLength];
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rootAry[rootIdx] = subAry;
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}
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Object curVal = subAry[subIdx];
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if ( isAdd && curVal != null) throw Err_.new_wo_type(".Add cannot be called on non-null vals; call .Set instead", "key", key, "val", curVal);
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if (!isAdd && curVal == null) throw Err_.new_wo_type(".Set cannot be called on null vals; call .Add instead", "key", key);
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subAry[subIdx] = obj;
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if (isAdd) count++;
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}
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void ExpandRootAry(int key) {
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int newRootAryBound = (key / subAryLength) + 1;
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Object[] newRootAry = new Object[newRootAryBound];
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Array_.Copy(rootAry, newRootAry);
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rootAry = newRootAry;
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maxKey = (rootAry.length * subAryLength) - 1;
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}
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Object[] FetchSubAry(int key) {
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rootIdx = key / subAryLength;
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subIdx = key % subAryLength;
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return (Object[])rootAry[rootIdx];
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}
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Object[] rootAry = new Object[0]; int maxKey = -1;
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int rootIdx, subIdx; // NOTE: these are temp values that are cached at class level for PERF (originally out)
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public Object Bay() {return bay;} public void Bay_set(Object v) {bay = v;} Object bay = null;
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static final int subAryLength = 16;
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}
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class IntObjHash_base_ {
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public static IntObjHash_base new_() {return new IntObjHash_base();}
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public static IntObjHash_base as_(Object obj) {return obj instanceof IntObjHash_base ? (IntObjHash_base)obj : null;}
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}
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