Here you can find the source of buildUrl(String base, String local)
public static String buildUrl(String base, String local)
//package com.java2s; /* Copyright (c) 2002,2003, Stefan Haustein, Oberhausen, Rhld., Germany * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or * sell copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. *//* w w w . java2 s . c o m*/ public class Main { public static String buildUrl(String base, String local) { int ci = local.indexOf(':'); // slash or 2nd char colon: ignore base, return file:///local if (local.startsWith("/") || ci == 1) return "file:///" + local; // local contains colon, assume URL, return local if (ci > 2 && ci < 6) return local; if (base == null) base = "file:///"; else { if (base.indexOf(':') == -1) base = "file:///" + base; if (!base.endsWith("/")) base = base + ("/"); } return base + local; } public static int indexOf(Object[] arr, Object find) { for (int i = 0; i < arr.length; i++) { if (arr[i].equals(find)) return i; } return -1; } }