1 | /*
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2 | * Search4j utility
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3 | * Command Line utility to search a system for java, launch a jar, or compare java versions
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4 | * base on launch4j
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5 | */
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6 |
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7 | #include <iostream>
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8 | #include <string>
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9 | #include <windows.h>
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10 | using namespace std;
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11 |
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12 | bool verbose = false;
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13 |
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14 | enum JvmProperty {
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15 | JavaHome,
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16 | Version,
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17 | Executable
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18 | };
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19 |
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20 | enum Action {
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21 | Find,
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22 | Launch,
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23 | Compare
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24 | };
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25 |
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26 | int process( char* command, string &output ) {
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27 | PROCESS_INFORMATION pi;
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28 | STARTUPINFO si;
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29 | memset(&pi, 0, sizeof(pi));
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30 | memset(&si, 0, sizeof(si));
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31 | si.cb = sizeof(si);
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32 |
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33 | DWORD dwExitCode = -1;
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34 | char cmdline[1024];
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35 | strcpy(cmdline, "dir");
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36 |
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37 | if ( CreateProcess(NULL, command, NULL, NULL, TRUE, 0, NULL, NULL, &si, &pi) ) {
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38 | WaitForSingleObject(pi.hProcess, INFINITE);
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39 | GetExitCodeProcess(pi.hProcess, &dwExitCode);
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40 | CloseHandle(pi.hThread);
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41 | CloseHandle(pi.hProcess);
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42 | }
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43 | return 1;
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44 |
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45 | }
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46 |
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47 | class Jvm {
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48 |
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49 | string javaHome;
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50 | bool isJdk;
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51 |
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52 | // version string. era.major.minor_update. eg: 1.4.2_02
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53 | string version;
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54 | int era;
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55 | int major;
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56 | int minor;
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57 | int update;
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58 |
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59 | public:
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60 |
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61 | void setJavaHome( string jh ) {
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62 | javaHome = jh;
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63 | setVersion();
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64 | }
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65 |
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66 | string getJavaHome() {
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67 | return javaHome;
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68 | }
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69 |
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70 | string getExecutable() {
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71 | string exec = "";
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72 | exec.append( javaHome );
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73 | exec.append( "\\bin\\java.exe" );
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74 | return exec;
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75 | }
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76 |
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77 | string getVersion() {
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78 | return version;
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79 | }
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80 |
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81 | bool check() {
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82 | return true;
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83 | }
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84 |
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85 | private:
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86 |
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87 | void setVersion() {
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88 |
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89 | string command = "", output="";
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90 | command.append( getExecutable() );
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91 | command.append(" -version");
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92 | //bool result = process( command, output );
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93 | }
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94 |
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95 |
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96 | };
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97 |
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98 |
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99 | string actionToString( Action a ) {
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100 | if ( a == Find )
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101 | return "Find";
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102 | else if ( a == Launch )
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103 | return "Launch";
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104 | else if ( a == Compare )
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105 | return "Compare";
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106 | return "Unknown";
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107 | }
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108 |
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109 | string jvmPropertyToString( JvmProperty jp ) {
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110 | if ( jp == JavaHome )
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111 | return "JavaHome";
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112 | else if ( jp == Version )
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113 | return "Version";
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114 | else if ( jp == Executable )
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115 | return "Executable";
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116 | return "Unknown";
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117 | }
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118 |
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119 | void usage() {
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120 |
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121 | cout
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122 | << "-----------------" << endl
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123 | << " search4j: usage" << endl
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124 | << "-----------------" << endl
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125 | << "Three usage methods: find, compare and launch" << endl
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126 | << endl
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127 | << "find: find java and print out information about it" << endl
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128 | << endl
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129 | << " search4j [-v|-e] [-m VERSION_STRING]" << endl
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130 | << " eg: search4j -m 1.4.1_01 -e" << endl
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131 | << endl
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132 | << " by default, print JAVA_HOME. E.g., C:\\Program Files\\jre1.5.0_15, or" << endl
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133 | << " if -v is specified, print the java version string. E.g. 1.5.0_15, or" << endl
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134 | << " if -e is specified, print the path the to the java executable. E.g. C:\\Program Files\\jre1.5.0_15\\bin\\java.exe" << endl
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135 | << " if -m option is used, find a java of the given version or newer, or fail" << endl
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136 | << endl
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137 | << "compare: compare the found java with the given java version string" << endl
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138 | << endl
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139 | << " search4j -c VERSION_STRING" << endl
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140 | << " eg: search4j -c VERSION_STRING" << endl
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141 | << endl
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142 | << " print -1 if found java is older" << endl
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143 | << " print 0 if found java is same" << endl
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144 | << " print 1 if found java is newer" << endl
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145 | << endl
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146 | << "launch: launch the given executable jar with the found java" << endl
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147 | << endl
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148 | << " search4j -l EXECUTABLE_JAR [-m VERSION_STRING]" << endl
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149 | << " eg: search4j -l greenstone3.jar" << endl
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150 | << endl
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151 | << " specify the location of the jar relative to the current directory" << endl
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152 | << " if -m option is used, find a java of the given version or newer" << endl
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153 | << endl
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154 | << "Global Options:" << endl
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155 | << " --verbose : have search4j print out information about what its doing" << endl
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156 | << " --help : display this usage screen" << endl
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157 | << endl
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158 | ;
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159 | }
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160 |
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161 |
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162 | /*
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163 | * function to find java
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164 | * implements the logic drawn on the dl lab whiteboard in feb 08
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165 | * return a Jvm object which represents the jvm on disk
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166 | */
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167 | bool find( Jvm &jvm ) {
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168 |
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169 | if ( verbose ) cout << "Searching for a JVM" << endl;
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170 | char *javaHome = "";
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171 | bool jvmFound = false;
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172 |
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173 | if ( !jvmFound ) {
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174 | //try JAVA_HOME
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175 | if ( verbose ) cout << " - trying JAVA_HOME" << endl;
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176 | javaHome = getenv( "JAVA_HOME" );
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177 | if ( javaHome != NULL ) {
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178 | jvm.setJavaHome( javaHome );
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179 | if ( jvm.check() ) {
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180 | jvmFound = true;
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181 | }
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182 | }
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183 | }
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184 |
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185 | if ( !jvmFound ) {
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186 | //try JRE_HOME
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187 | if ( verbose ) cout << " - trying JRE_HOME" << endl;
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188 | javaHome = getenv( "JRE_HOME" );
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189 | if ( javaHome != NULL ) {
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190 | jvm.setJavaHome( javaHome );
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191 | if ( jvm.check() ) {
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192 | jvmFound = true;
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193 | }
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194 | }
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195 | }
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196 |
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197 | return jvmFound;
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198 | }
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199 |
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200 |
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201 | int main ( int argc, char** argv ) {
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202 |
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203 | string output = "";
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204 | int result = process("dir", output);
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205 | cout << "dir:" << endl << output << endl << result << endl;
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206 |
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207 | JvmProperty jvmProperty = JavaHome;
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208 | Action action = Find;
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209 | string arg1 = "";
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210 |
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211 | //parse commandline arguments
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212 | for (int i=1; i<argc; i++) {
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213 | if ( _stricmp(argv[i], "--verbose") == 0 ) {
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214 | verbose = true;
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215 | } else if ( _stricmp(argv[i], "--help") == 0 || _stricmp(argv[i], "--usage") == 0 ) {
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216 | usage();
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217 | return 0;
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218 | } else if ( _stricmp(argv[i], "-v") == 0 ) {
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219 | jvmProperty = Version;
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220 | } else if ( _stricmp(argv[i], "-e") == 0 ) {
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221 | jvmProperty = Executable;
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222 | } else if ( _stricmp(argv[i], "-c") == 0 ) {
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223 | action = Compare;
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224 | if ( i == argc-1 ) {
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225 | usage();
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226 | return 0;
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227 | } else {
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228 | arg1 = argv[++i];
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229 | }
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230 | } else if ( _stricmp(argv[i], "-l") == 0 ) {
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231 | action = Launch;
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232 | arg1 = argv[++i];
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233 | } else {
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234 | cout << "unknown option: " << argv[i] << endl;
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235 | return -1;
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236 | }
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237 | }
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238 |
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239 | //summarise commandline arguments
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240 | if ( verbose ) {
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241 | cout << "Action: " << actionToString( action ) << endl;
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242 | if ( action == Find ) cout << "Property to print: " << jvmPropertyToString( jvmProperty ) << endl;
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243 | if ( action == Compare ) cout << "Compare to java at: " << arg1 << endl;
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244 | if ( action == Launch ) cout << "Jar to launch: " << arg1 << endl;
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245 | }
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246 |
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247 |
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248 | //Find Action
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249 | //---------------
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250 | if ( action == Find ) {
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251 |
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252 | //find java
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253 | Jvm jvm;
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254 | bool found = find( jvm );
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255 |
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256 | //check if it was found
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257 | if ( found ) {
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258 |
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259 | //found - print out info about it
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260 | if ( verbose ) cout << "JVM found!" << endl;
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261 | if ( jvmProperty == JavaHome ) {
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262 | cout << jvm.getJavaHome() << endl;
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263 | } else if ( jvmProperty == Version ) {
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264 | cout << jvm.getVersion() << endl;
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265 | } else if ( jvmProperty == Version ) {
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266 | cout << jvm.getExecutable() << endl;
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267 | } else {
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268 | return -1; //should never happen
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269 | }
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270 |
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271 | } else {
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272 |
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273 | //not found - exit with -1
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274 | if ( verbose ) cout << "JVM not found" << endl;
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275 | return -1;
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276 |
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277 | }
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278 |
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279 |
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280 |
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281 | //Compare Action
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282 | //---------------
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283 | } else if ( action == Compare ) {
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284 | //compare();
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285 |
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286 |
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287 |
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288 | //Launch Action
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289 | //---------------
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290 | } else if ( action == Launch ) {
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291 | //launch();
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292 | }
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293 |
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294 |
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295 | return 0;
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296 | } |
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