private static <T> T convertFrom(Object x, OpenType<T> openType) {
if (openType.isValue(x)) {
T t = OpenMBeanAttributeInfoSupport.<T>cast(x);
return t;
}
return convertFromStrings(x, openType);
}
/**
* Returns the hash code value for this {@code OpenMBeanParameterInfoSupport} instance.
*
* <p>The hash code of an {@code OpenMBeanParameterInfoSupport} instance is the sum of the hash
* codes of all elements of information used in {@code equals} comparisons (ie: its name, its
* <i>open type</i>, its default, min, max and legal values, and its Descriptor).
*
* <p>This ensures that {@code t1.equals(t2)} implies that {@code t1.hashCode()==t2.hashCode()}
* for any two {@code OpenMBeanParameterInfoSupport} instances {@code t1} and {@code t2}, as
* required by the general contract of the method {@link Object#hashCode() Object.hashCode()}.
*
* <p>However, note that another instance of a class implementing the {@code
* OpenMBeanParameterInfo} interface may be equal to this {@code OpenMBeanParameterInfoSupport}
* instance as defined by {@link #equals(java.lang.Object)}, but may have a different hash code if
* it is calculated differently.
*
* <p>As {@code OpenMBeanParameterInfoSupport} instances are immutable, the hash code for this
* instance is calculated once, on the first call to {@code hashCode}, and then the same value is
* returned for subsequent calls.
*
* @return the hash code value for this {@code OpenMBeanParameterInfoSupport} instance
*/
public int hashCode() {
// Calculate the hash code value if it has not yet been done
// (ie 1st call to hashCode())
//
if (myHashCode == null) myHashCode = OpenMBeanAttributeInfoSupport.hashCode(this);
// return always the same hash code for this instance (immutable)
//
return myHashCode.intValue();
}
/**
* Returns a string representation of this {@code OpenMBeanParameterInfoSupport} instance.
*
* <p>The string representation consists of the name of this class (i.e. {@code
* javax.management.openmbean.OpenMBeanParameterInfoSupport}), the string representation of the
* name and open type of the described parameter, the string representation of its default, min,
* max and legal values and the string representation of its descriptor.
*
* <p>As {@code OpenMBeanParameterInfoSupport} instances are immutable, the string representation
* for this instance is calculated once, on the first call to {@code toString}, and then the same
* value is returned for subsequent calls.
*
* @return a string representation of this {@code OpenMBeanParameterInfoSupport} instance.
*/
public String toString() {
// Calculate the string value if it has not yet been done (ie
// 1st call to toString())
//
if (myToString == null) myToString = OpenMBeanAttributeInfoSupport.toString(this);
// return always the same string representation for this
// instance (immutable)
//
return myToString;
}
/* A Descriptor contained an array value encoded as Strings. The
Strings must be organized in an array corresponding to the desired
array. If the desired array has n dimensions, so must the String
array. We will convert element by element from String to desired
component type. */
private static <T> T convertFromStringArray(Object x, OpenType<T> openType) {
ArrayType<?> arrayType = (ArrayType<?>) openType;
OpenType<?> baseType = arrayType.getElementOpenType();
int dim = arrayType.getDimension();
String squareBrackets = "[";
for (int i = 1; i < dim; i++) squareBrackets += "[";
Class<?> stringArrayClass;
Class<?> targetArrayClass;
try {
stringArrayClass = Class.forName(squareBrackets + "Ljava.lang.String;");
targetArrayClass = Class.forName(squareBrackets + "L" + baseType.safeGetClassName() + ";");
} catch (ClassNotFoundException e) {
throw new NoClassDefFoundError(e.toString()); // can't happen
}
if (!stringArrayClass.isInstance(x)) {
final String msg =
"Value for "
+ dim
+ "-dimensional array of "
+ baseType.getTypeName()
+ " must be same type or a String "
+ "array with same dimensions";
throw new IllegalArgumentException(msg);
}
OpenType<?> componentOpenType;
if (dim == 1) componentOpenType = baseType;
else {
try {
componentOpenType = new ArrayType<T>(dim - 1, baseType);
} catch (OpenDataException e) {
throw new IllegalArgumentException(e.getMessage(), e);
// can't happen
}
}
int n = Array.getLength(x);
Object[] targetArray = (Object[]) Array.newInstance(targetArrayClass.getComponentType(), n);
for (int i = 0; i < n; i++) {
Object stringish = Array.get(x, i); // String or String[] etc
Object converted = convertFromStrings(stringish, componentOpenType);
Array.set(targetArray, i, converted);
}
return OpenMBeanAttributeInfoSupport.<T>cast(targetArray);
}
/**
* Tests whether {@code obj} is a valid value for the parameter described by this {@code
* OpenMBeanParameterInfo} instance.
*
* @param obj the object to be tested.
* @return {@code true} if {@code obj} is a valid value for the parameter described by this {@code
* OpenMBeanParameterInfo} instance, {@code false} otherwise.
*/
public boolean isValue(Object obj) {
return OpenMBeanAttributeInfoSupport.isValue(this, obj);
// compiler bug? should be able to omit class name here
// also below in toString and hashCode
}
