[10186] | 1 | /*
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[9874] | 2 | * Misc.java
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| 3 | * Copyright (C) 2002 New Zealand Digital Library, http://www.nzdl.org
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| 4 | *
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| 5 | * This program is free software; you can redistribute it and/or modify
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| 6 | * it under the terms of the GNU General Public License as published by
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| 7 | * the Free Software Foundation; either version 2 of the License, or
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| 8 | * (at your option) any later version.
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| 9 | *
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| 10 | * This program is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | * GNU General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU General Public License
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| 16 | * along with this program; if not, write to the Free Software
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| 17 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 18 | */
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[4101] | 19 |
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[22085] | 20 | package org.greenstone.util;
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[4101] | 21 |
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| 22 | import java.util.HashMap;
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| 23 | import java.util.Set;
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| 24 | import java.util.Map;
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| 25 | import java.util.Iterator;
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[7444] | 26 | import java.util.Properties;
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[9874] | 27 | import java.io.InputStream;
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| 28 | import java.io.BufferedReader;
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| 29 | import java.io.InputStreamReader;
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| 30 | import java.io.IOException;
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| 31 | import java.net.HttpURLConnection;
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| 32 | import java.net.URL;
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| 33 | import java.net.URLConnection;
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[4101] | 34 |
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| 35 | /** contains miscellaneous functions */
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| 36 | public class Misc {
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[31573] | 37 |
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| 38 | // Can initialise static final vars on declaration or in static initialisation code block
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| 39 | // http://stackoverflow.com/questions/2339932/java-can-final-variables-be-initialized-in-static-initialization-block
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| 40 | // Initialise object member final vars on declaration or in constructors
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| 41 | public static final String NEWLINE;
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[4101] | 42 |
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[31573] | 43 | // Before Java 7, no System.lineSeparator() or System.getProperty("line.separator")
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| 44 | // And on local linux, am compiling with JDK 6, so need this.
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| 45 | // http://stackoverflow.com/questions/207947/how-do-i-get-a-platform-dependent-new-line-character
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| 46 |
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| 47 | static {
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| 48 | // http://stackoverflow.com/questions/2591083/getting-java-version-at-runtime
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| 49 | // https://www.tutorialspoint.com/java/lang/package_getspecificationversion.htm
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| 50 |
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| 51 | double java_version = Double.parseDouble(System.getProperty("java.specification.version"));
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| 52 | if(java_version >= 1.7) { // https://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html
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| 53 | NEWLINE = System.getProperty("line.separator");
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| 54 | } else {
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| 55 | NEWLINE = isWindows() ? "\r\n" : "\n";
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| 56 | }
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| 57 | }
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| 58 |
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[4101] | 59 | public static void printHash(HashMap map) {
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| 60 | Set entries = map.entrySet();
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| 61 | Iterator i = entries.iterator();
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| 62 | while (i.hasNext()) {
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| 63 | Map.Entry m = (Map.Entry)i.next();
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| 64 | String name = (String)m.getKey();
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| 65 | String value = (String)m.getValue();
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| 66 | }
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| 67 | }
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[32608] | 68 |
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[4101] | 69 |
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[32608] | 70 | /**
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| 71 | * Handy function to display the list of calling functions by
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| 72 | * printing out the stack trace even when you don't have an exception
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| 73 | */
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| 74 | static public void printStackTrace() {
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| 75 | // https://stackoverflow.com/questions/1069066/get-current-stack-trace-in-java
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| 76 |
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| 77 | //Thread.dumpStack(); // looks too much like an exception, though the newlines separating each function call is handy
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| 78 | //new Exception().printStackTrace(); // outputs in the format of an exception too
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| 79 | //System.err.println("\n@@@@ stacktrace:\n" + Arrays.toString(Thread.currentThread().getStackTrace()) + "\n"); // outputs all in one line
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| 80 |
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| 81 | System.err.println("\n@@@@ stacktrace:");
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| 82 | StackTraceElement[] els = new Throwable().getStackTrace(); // starts at index 1, which is this function
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| 83 | //StackTraceElement[] els = Thread.currentThread().getStackTrace(); starts at index 0, "java.lang.Thread.getStackTrace()"
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| 84 | for(StackTraceElement ste : els) {
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| 85 | System.err.println(" " + ste);
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| 86 | }
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| 87 | }
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| 88 |
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| 89 | /**
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| 90 | * Handy function to display the parent of the calling function
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| 91 | * (the function that called the function that called printCaller())
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| 92 | */
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| 93 | static public void printCaller() {
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| 94 | int parent = 1;
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| 95 | // this function printCaller() itself adds another layer on the callstack since
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| 96 | // it calls the overloaded method, so need to add 1 more to parent
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| 97 | printCaller(parent++);
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| 98 | }
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| 99 |
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| 100 | /**
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| 101 | * Handy function to display the nth ancestor of the calling function
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| 102 | * where ancestor=0 would be the calling function itself
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| 103 | */
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| 104 | static public void printCaller(int ancestor) {
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| 105 | // https://stackoverflow.com/questions/1069066/get-current-stack-trace-in-java
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| 106 |
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| 107 | // Thread.currentThread().getStackTrace() starts at index 0: "java.lang.Thread.getStackTrace()"
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| 108 | // index 1 will be this method (printCaller) and index 2 will be the calling function itself who wants
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| 109 | // to know who called it. So need to at least start at index 3 to get informative caller information
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| 110 |
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| 111 | StackTraceElement[] callstack = Thread.currentThread().getStackTrace();
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| 112 | StackTraceElement requestor = callstack[2]; // the calling function, the function that called this one
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| 113 | StackTraceElement caller_requested = callstack[ancestor+3]; // the function requested
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| 114 | System.err.println("@@@ Function " + requestor + " called by:\n "
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| 115 | + caller_requested + " at " + ancestor + " ancestors back");
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| 116 | }
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| 117 |
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| 118 |
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[10169] | 119 | /** Method to determine if the host system is Windows based.
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| 120 | * @return a boolean which is true if the platform is Windows,
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| 121 | * false otherwise
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| 122 | */
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[7444] | 123 | public static boolean isWindows() {
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| 124 | Properties props = System.getProperties();
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| 125 | String os_name = props.getProperty("os.name","");
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| 126 | if(os_name.startsWith("Windows")) {
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| 127 | return true;
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| 128 | }
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| 129 | return false;
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| 130 | }
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[10169] | 131 |
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[13207] | 132 | public static boolean isWindows9x() {
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| 133 | Properties props = System.getProperties();
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| 134 | String os_name = props.getProperty("os.name","");
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| 135 | if(os_name.startsWith("Windows") && os_name.indexOf("9") != -1) {
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| 136 | return true;
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| 137 | }
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| 138 | return false;
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| 139 | }
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| 140 |
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[10169] | 141 | /** Method to determine if the host system is MacOS based.
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| 142 | * @return a boolean which is true if the platform is MacOS, false otherwise
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| 143 | */
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| 144 | public static boolean isMac() {
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| 145 | Properties props = System.getProperties();
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| 146 | String os_name = props.getProperty("os.name","");
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| 147 | if(os_name.startsWith("Mac OS")) {
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| 148 | return true;
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| 149 | }
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| 150 | return false;
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| 151 | }
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[29576] | 152 |
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| 153 | public static String getGsdlOS() {
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| 154 | if (isWindows()) {
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| 155 | return "windows";
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| 156 | }
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| 157 | if (isMac()) {
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| 158 | return "darwin";
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| 159 | }
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| 160 | return "linux";
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| 161 | }
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[13207] | 162 |
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[10899] | 163 | public static boolean isBigEndian() {
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[7444] | 164 |
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[10899] | 165 | if (System.getProperty("sun.cpu.endian").equals("big")) {
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| 166 | return true;
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| 167 | }
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| 168 | return false;
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| 169 |
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| 170 | }
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| 171 |
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[9874] | 172 | public static BufferedReader makeHttpConnection(String url_string)
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| 173 | throws java.net.MalformedURLException, java.io.IOException {
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| 174 | BufferedReader reader = null;
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| 175 | URL url = new URL(url_string);
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| 176 | HttpURLConnection connection = (HttpURLConnection)url.openConnection();
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| 177 | InputStream input = connection.getInputStream();
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| 178 | reader = new BufferedReader(new InputStreamReader(input));
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| 179 | return reader;
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| 180 | }
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| 181 |
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[10899] | 182 | public static void main(String [] args) {
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| 183 | isBigEndian();
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| 184 | }
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| 185 |
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[4101] | 186 | }
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[9874] | 187 |
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