/**
* Return an <code>Entry</code> object built out of this <code>EntryRep</code> This is used by the
* client-side proxy to convert the <code>EntryRep</code> it gets from the space server into the
* actual <code>Entry</code> object it represents.
*
* @throws UnusableEntryException One or more fields in the entry cannot be deserialized, or the
* class for the entry type itself cannot be deserialized.
*/
Entry entry() throws UnusableEntryException {
ObjectInputStream objIn = null;
try {
ArrayList badFields = null;
ArrayList except = null;
realClass = ClassLoading.loadClass(codebase, className, null, integrity, null);
if (findHash(realClass, false).longValue() != hash)
throw throwNewUnusableEntryException(
new IncompatibleClassChangeError(realClass + " changed"));
Entry entryObj = (Entry) realClass.newInstance();
Field[] fields = getFields(realClass);
/*
* Loop through the fields, ensuring no primitives and
* checking for wildcards.
*/
int nvals = 0; // index into this.values[]
for (int i = 0; i < fields.length; i++) {
Throwable nested = null;
try {
if (!usableField(fields[i])) continue;
final MarshalledInstance val = values[nvals++];
Object value = (val == null ? null : val.get(integrity));
fields[i].set(entryObj, value);
} catch (Throwable e) {
nested = e;
}
if (nested != null) { // some problem occurred
if (badFields == null) {
badFields = new ArrayList(fields.length);
except = new ArrayList(fields.length);
}
badFields.add(fields[i].getName());
except.add(nested);
}
}
/* See if any fields have vanished from the class,
* because of the hashing this should never happen but
* throwing an exception that provides more info
* (instead of AssertionError) seems harmless.
*/
if (nvals < values.length) {
throw throwNewUnusableEntryException(
entryObj, // should this be null?
null, // array of bad-field names
new Throwable[] { // array of exceptions
new IncompatibleClassChangeError(
"A usable field has been removed from "
+ entryObj.getClass().getName()
+ " since this EntryRep was created")
});
}
// if there were any bad fields, throw the exception
if (badFields != null) {
String[] bf = (String[]) badFields.toArray(new String[badFields.size()]);
Throwable[] ex = (Throwable[]) except.toArray(new Throwable[bf.length]);
throw throwNewUnusableEntryException(entryObj, bf, ex);
}
// everything fine, return the entry
return entryObj;
} catch (InstantiationException e) {
/*
* If this happens outside a per-field deserialization then
* this is a complete failure The per-field ones are caught
* inside the per-field loop.
*/
throw throwNewUnusableEntryException(e);
} catch (ClassNotFoundException e) {
// see above
throw throwNewUnusableEntryException(
"Encountered a " + "ClassNotFoundException while unmarshalling " + className, e);
} catch (IllegalAccessException e) {
// see above
throw throwNewUnusableEntryException(e);
} catch (RuntimeException e) {
// see above
throw throwNewUnusableEntryException(
"Encountered a " + "RuntimeException while unmarshalling " + className, e);
} catch (MalformedURLException e) {
// see above
throw throwNewUnusableEntryException(
"Malformed URL " + "associated with entry of type " + className, e);
} catch (MarshalException e) {
// because we call findHash() w/ false, should never happen
throw new AssertionError(e);
}
}
/**
* Create a serialized form of the entry. If <code>validate</code> is <code>true</code>, basic
* sanity checks are done on the class to ensure that it meets the requirements to be an <code>
* Entry</code>. <code>validate</code> is <code>false</code> only when creating the stand-in
* object for "match any", which is never actually marshalled on the wire and so which doesn't
* need to be "proper".
*/
private EntryRep(Entry entry, boolean validate) throws MarshalException {
realClass = entry.getClass();
if (validate) ensureValidClass(realClass);
className = realClass.getName();
codebase = RMIClassLoader.getClassAnnotation(realClass);
/*
* Build up the per-field and superclass information through
* the reflection API.
*/
final Field[] fields = getFields(realClass);
int numFields = fields.length;
// collect the usable field values in vals[0..nvals-1]
MarshalledInstance[] vals = new MarshalledInstance[numFields];
int nvals = 0;
for (int fnum = 0; fnum < fields.length; fnum++) {
final Field field = fields[fnum];
if (!usableField(field)) continue;
final Object fieldValue;
try {
fieldValue = field.get(entry);
} catch (IllegalAccessException e) {
/* In general between using getFields() and
* ensureValidClass this should never happen, however
* there appear to be a few screw cases and
* IllegalArgumentException seems appropriate.
*/
final IllegalArgumentException iae =
new IllegalArgumentException("Couldn't access field " + field);
iae.initCause(e);
throw throwRuntime(iae);
}
if (fieldValue == null) {
vals[nvals] = null;
} else {
try {
vals[nvals] = new MarshalledInstance(fieldValue);
} catch (IOException e) {
throw throwNewMarshalException(
"Can't marshal field " + field + " with value " + fieldValue, e);
}
}
nvals++;
}
// copy the vals with the correct length
this.values = new MarshalledInstance[nvals];
System.arraycopy(vals, 0, this.values, 0, nvals);
try {
hash = findHash(realClass, true).longValue();
} catch (UnusableEntryException e) {
// Will never happen when we pass true to findHash
throw new AssertionError(e);
}
// Loop through the supertypes, making a list of all superclasses.
ArrayList sclasses = new ArrayList();
ArrayList shashes = new ArrayList();
for (Class c = realClass.getSuperclass(); c != Object.class; c = c.getSuperclass()) {
try {
sclasses.add(c.getName());
shashes.add(findHash(c, true));
} catch (ClassCastException cce) {
break; // not Serializable
} catch (UnusableEntryException e) {
// Will never happen when we pass true to findHash
throw new AssertionError(e);
}
}
superclasses = (String[]) sclasses.toArray(new String[sclasses.size()]);
hashes = new long[shashes.size()];
for (int i = 0; i < hashes.length; i++) {
hashes[i] = ((Long) shashes.get(i)).longValue();
}
}
