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package org.jruby.platform;
import com.kenai.constantine.Constant;
import com.kenai.constantine.ConstantSet;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.jruby.IErrno;
/**
* Holds the platform specific errno values.
*/
public final class Errno {
private static final Collection<Constant> constants = getConstants();
private static final Collection<Constant> getConstants() {
ConstantSet c = ConstantSet.getConstantSet("Errno");
if (c != null) {
return c;
}
return getConstantsFromFields(IErrno.class);
}
public static Collection<Constant> values() {
return constants;
}
private static final class FakeConstant implements Constant {
private final String name;
private final int value;
FakeConstant(String name, int value) {
this.name = name;
this.value = value;
}
public int value() {
return value;
}
public String name() {
return name;
}
}
/**
* Loads the errno values from a static field called 'CONSTANTS' in the class.
* @param errnoClass The class to load errno constants from.
* @return A map of errno name to errno value.
*/
private static Collection<Constant> getConstantsFromFields(Class errnoClass) {
Field[] fields = errnoClass.getFields();
List<Constant> c = new ArrayList<Constant>(fields.length);
for (int i = 0; i < fields.length; ++i) {
try {
c.add(new FakeConstant(fields[i].getName(), fields[i].getInt(errnoClass)));
} catch (IllegalAccessException ex) {
throw new RuntimeException("Non public constant in " + errnoClass.getName(), ex);
}
}
return Collections.unmodifiableCollection(c);
}
}