initial version

src/main/java/net/rubygrapefruit/platform/NativeException.java

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+package net.rubygrapefruit.platform;
+
+public class NativeException extends RuntimeException {
+    public NativeException(String message) {
+        super(message);
+    }
+}

src/main/java/net/rubygrapefruit/platform/NativeIntegration.java

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+package net.rubygrapefruit.platform;
+
+public interface NativeIntegration {
+}

src/main/java/net/rubygrapefruit/platform/Platform.java

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+package net.rubygrapefruit.platform;
+
+import net.rubygrapefruit.platform.internal.FileStat;
+import net.rubygrapefruit.platform.internal.FunctionResult;
+import net.rubygrapefruit.platform.internal.PosixFileFunctions;
+
+import java.io.File;
+import java.io.IOException;
+
+public class Platform {
+    private static final Object lock = new Object();
+    private static boolean loaded;
+
+    static <T extends NativeIntegration> T get(Class<T> type) {
+        synchronized (lock) {
+            if (!loaded) {
+                System.setProperty("java.library.path", new File("build/binaries").getAbsolutePath());
+                try {
+                    System.load(new File("build/binaries/libnative-platform.dylib").getCanonicalPath());
+                } catch (IOException e) {
+                    throw new RuntimeException(e);
+                }
+                loaded = true;
+            }
+        }
+        return type.cast(new UnixFileMode() {
+            @Override
+            public void setMode(File file, int perms) {
+                FunctionResult result = new FunctionResult();
+                PosixFileFunctions.chmod(file.getPath(), perms, result);
+                if (result.isFailed()) {
+                    throw new NativeException(String.format("Could not set UNIX mode on %s. Errno is %d.", file, result.getErrno()));
+                }
+            }
+
+            @Override
+            public int getMode(File file) {
+                FunctionResult result = new FunctionResult();
+                FileStat stat = new FileStat();
+                PosixFileFunctions.stat(file.getPath(), stat, result);
+                if (result.isFailed()) {
+                    throw new NativeException(String.format("Could not get UNIX mode on %s. Errno is %d.", file, result.getErrno()));
+                }
+                return stat.mode;
+            }
+        });
+    }
+}

src/main/java/net/rubygrapefruit/platform/UnixFileMode.java

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+package net.rubygrapefruit.platform;
+
+import java.io.File;
+
+public interface UnixFileMode extends NativeIntegration {
+    void setMode(File path, int perms) throws NativeException;
+
+    int getMode(File path) throws NativeException;
+}

src/main/java/net/rubygrapefruit/platform/internal/FileStat.java

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+package net.rubygrapefruit.platform.internal;
+
+public class FileStat {
+    public int mode;
+}

src/main/java/net/rubygrapefruit/platform/internal/FunctionResult.java

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+package net.rubygrapefruit.platform.internal;
+
+public class FunctionResult {
+    int errno;
+
+    public boolean isFailed() {
+        return errno != 0;
+    }
+
+    public int getErrno() {
+        return errno;
+    }
+}

src/main/java/net/rubygrapefruit/platform/internal/PosixFileFunctions.java

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+package net.rubygrapefruit.platform.internal;
+
+public class PosixFileFunctions {
+    public static native void chmod(String file, int perms, FunctionResult result);
+
+    public static native void stat(String file, FileStat stat, FunctionResult result);
+}