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wims  3.65+svn20090927
FunctionStack.java
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00001 /*
00002  * Copyright (C) 2008 Mihai Preda.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 package org.javia.arity;
00018 
00019 class FunctionStack {
00020     private Function[] data = new Function[8];
00021     private int size = 0;
00022 
00023     void clear() {
00024         size = 0;
00025     }
00026 
00027     void push(Function b) {
00028         if (size >= data.length) {
00029             Function[] newData = new Function[data.length << 1];
00030             System.arraycopy(data, 0, newData, 0, data.length);
00031             data = newData;
00032         }
00033         data[size++] = b;
00034     }
00035 
00036     void pop(int cnt) {
00037         size -= cnt;
00038     }
00039 
00040     Function[] toArray() {
00041         Function[] trimmed = new Function[size];
00042         System.arraycopy(data, 0, trimmed, 0, size);
00043         return trimmed;
00044     }
00045 }