A simple integer based stack.
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *//** * A simple integer based stack. * * moved to org.apache.xerces.util by neilg to support the * XPathMatcher. * @author Andy Clark, IBM * * @version $Id: IntStack.java 447241 2006-09-18 05:12:57Z mrglavas $ */publicfinalclass IntStack { // // Data // /** Stack depth. */privateint fDepth; /** Stack data. */privateint[] fData; // // Public methods // /** Returns the size of the stack. */publicint size() { return fDepth; } /** Pushes a value onto the stack. */publicvoid push(int value) { ensureCapacity(fDepth + 1); fData[fDepth++] = value; } /** Peeks at the top of the stack. */publicint peek() { return fData[fDepth - 1]; } /** Returns the element at the specified depth in the stack. */publicint elementAt(int depth) { return fData[depth]; } /** Pops a value off of the stack. */publicint pop() { return fData[--fDepth]; } /** Clears the stack. */publicvoid clear() { fDepth = 0; } // debugging /** Prints the stack. */publicvoid print() { System.out.print('('); System.out.print(fDepth); System.out.print(") {"); for (int i = 0; i < fDepth; i++) { if (i == 3) { System.out.print(" ..."); break; } System.out.print(' '); System.out.print(fData[i]); if (i < fDepth - 1) { System.out.print(','); } } System.out.print(" }"); System.out.println(); } // // Private methods // /** Ensures capacity. */privatevoid ensureCapacity(int size) { if (fData == null) { fData = newint[32]; } elseif (fData.length <= size) { int[] newdata = newint[fData.length * 2]; System.arraycopy(fData, 0, newdata, 0, fData.length); fData = newdata; } } } // class IntStack Related examples in the same category
