stdlib.java namespace more robust

This is important now that Matlab doesn't include Java

Author: scivision

+stdlib/java_api.m +stdlib/+java/api.m+stdlib/java_api.m renamed to +stdlib/+java/api.m

@@ -1,12 +1,12 @@
 %% JAVA_API Java API version
 
-function a = java_api()
+function a = api()
 
 try
   a = javaMethod('getProperty', 'java.lang.System', 'java.specification.version');
   a = str2double(a);
-catch
-  a = missing;
+catch e
+  a = javaException(e);
 end
 
 end

+stdlib/+java/cpu_load.m

@@ -5,7 +5,7 @@
 
   L = b.getSystemLoadAverage();
   if L < 0
-    if stdlib.java_api() < 14
+    if stdlib.java.api() < 14
       L = b.getSystemCpuLoad();
     else
       % https://docs.oracle.com/en/java/javase/21/docs/api/jdk.management/com/sun/management/OperatingSystemMXBean.html#getCpuLoad()

+stdlib/+java/home.m

@@ -0,0 +1,11 @@
+%% JAVA.HOME get the JAVA_HOME environment variable
+
+function h = home()
+
+try
+  h = char(javaMethod('getProperty', 'java.lang.System', 'java.home'));
+catch e
+  h = javaException(e);
+end
+
+end

+stdlib/+java/private/javaPathObject.m

@@ -1,8 +1,7 @@
 %% JAVAPATHOBJECT Return a Java nio.file.Path object for a given file path.
 function o = javaPathObject(p)
 
-ja = javaArray('java.lang.String', 0);
-o = javaMethod('get', 'java.nio.file.Paths', p, ja);
+o = java.nio.file.Paths.get(p, javaArray('java.lang.String', 0));
 
 % o = java.io.File(p).toPath();
 % javaArray way about 20% faster

+stdlib/+java/ram_free.m

@@ -3,7 +3,7 @@
 try
   b = javaMethod('getOperatingSystemMXBean', 'java.lang.management.ManagementFactory');
 
-  if stdlib.java_api() < 14
+  if stdlib.java.api() < 14
     bytes = b.getFreePhysicalMemorySize();
   else
     bytes = b.getFreeMemorySize();

+stdlib/+java/ram_total.m

@@ -7,7 +7,7 @@
 try
   b = javaMethod('getOperatingSystemMXBean', 'java.lang.management.ManagementFactory');
 
-  if stdlib.java_api() < 14
+  if stdlib.java.api() < 14
     bytes = b.getTotalPhysicalMemorySize();
   else
     bytes = b.getTotalMemorySize();

+stdlib/+java/vendor.m

@@ -0,0 +1,11 @@
+%% JAVA.VENDOR get vendor of Java Virtual Machine
+
+function v = vendor()
+
+try
+  v = char(javaMethod('getProperty', 'java.lang.System', 'java.vendor'));
+catch e
+  v = javaException(e);
+end
+
+end

+stdlib/java_version.m +stdlib/+java/version.m+stdlib/java_version.m renamed to +stdlib/+java/version.m

@@ -1,4 +1,4 @@
-%% JAVA_VERSION get version of Java Virtual Machine
+%% JAVA.VERSION get version of Java Virtual Machine
 %
 % this gives a long string with more detail
 % version('-java')
@@ -7,12 +7,12 @@
 % java.lang.Runtime.version()
 % java.lang.Runtime.getRuntime().version
 
-function v = java_version()
+function v = version()
 
 try
   v = char(javaMethod('getProperty', 'java.lang.System', 'java.version'));
-catch
-  v = missing;
+catch e
+  v = javaException(e);
 end
 
 end

+stdlib/doctor.m

@@ -27,11 +27,9 @@
   raw.netcdf = ncv;
 end
 
-if stdlib.has_java()
-  raw.java.vendor = stdlib.java_vendor();
-  raw.java.version = stdlib.java_version();
-  raw.java.home = stdlib.java_home();
-end
+raw.java.vendor = stdlib.java.vendor();
+raw.java.version = stdlib.java.version();
+raw.java.home = stdlib.java.home();
 
 if stdlib.has_dotnet()
   raw.dotnet.version = stdlib.dotnet_version();