91 lines
2.2 KiB
Java
91 lines
2.2 KiB
Java
/*******************************************************************************
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* Copyright (c) 2007 IBM Corporation.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package com.ibm.wala.util.graph;
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import com.ibm.wala.util.intset.SimpleIntVector;
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/**
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* We represent a path in a numbered graph as a vector of integers <i_1, ...,
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* i_n> where node i_1 is the src and node i_n is the sink
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*/
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public class Path extends SimpleIntVector {
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private static final long serialVersionUID = 5622964158500601280L;
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final int size;
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private Path(int defaultValue, int size) {
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super(defaultValue, size);
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this.size = size;
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}
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public static Path make(int value) {
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return new Path(value, 1);
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}
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public static Path prepend(int x, Path p) {
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if (p == null) {
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throw new IllegalArgumentException("null p");
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}
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Path result = new Path(0, p.size + 1);
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result.set(0, x);
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for (int i = 0; i < p.size; i++) {
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result.set(i + 1, p.get(i));
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}
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return result;
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}
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@Override
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public int hashCode() {
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int result = 7;
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for (int i = 0; i < size; i++) {
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result += 31 * (get(i) + 1);
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}
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (obj instanceof Path) {
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Path other = (Path) obj;
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if (size == other.size) {
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for (int i = 0; i < size; i++) {
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if (get(i) != other.get(i)) {
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return false;
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}
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}
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return true;
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} else {
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return false;
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}
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} else {
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return false;
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}
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}
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public int size() {
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return size;
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}
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@Override
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public String toString() {
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StringBuffer result = new StringBuffer("[");
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for (int i = 0; i < size; i++) {
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result.append(get(i));
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if (i < size -1) {
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result.append(",");
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}
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}
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result.append("]");
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return result.toString();
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}
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}
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