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Allow a null persistent record to be tranformed to a null runtime record, and

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fail immediately when trying to transform a null runtime record to a persistent
record.
This commit is contained in:
Michael Bayne
2009-07-09 19:50:22 +00:00
parent 7dd164525b
commit 4c697b06a4
1 changed files with 14 additions and 5 deletions
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src/java/com/samskivert/depot/util/RuntimeUtil.java
+14 -5
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@@ -68,9 +68,10 @@ public class RuntimeUtil
{
/**
* Creates a function that creates an instance of R and initializes all accessible (ie. public)
* fields of R from fields of P with matching name. Fields of P that do not exist in R will be
* ignored. See the class documentation for a list of field conversions that will be made
* automatically and the mechanism for performing other conversions.
* fields of R from fields of P with matching name. If the function is applied to null, null
* will be returned. Fields of P that do not exist in R will be ignored. See the class
* documentation for a list of field conversions that will be made automatically and the
* mechanism for performing other conversions.
*/
public static <P extends PersistentRecord, R> Function<P, R> makeToRuntime (
Class<P> pclass, final Class<R> rclass)
@@ -79,6 +80,9 @@ public class RuntimeUtil
final Getter[] getters = getPersistentGetters(pclass, rfields);
return new Function<P, R>() {
public R apply (P record) {
if (record == null) {
return null;
}
try {
R object = rclass.newInstance();
for (int ii = 0, ll = rfields.length; ii < ll; ii++) {
@@ -94,8 +98,9 @@ public class RuntimeUtil
/**
* Creates a function that creates an instance of P and initializes all accessible (ie. public)
* fields of P from fields of R with matching name. Fields of P that do not exist in R will be
* left as default. Note: the types of the fields must match exactly.
* fields of P from fields of R with matching name. If the function is applied to null a
* NullPointerException will be thrown. Fields of P that do not exist in R will be left as
* default. Note: the types of the fields must match exactly.
*/
public static <R, P extends PersistentRecord> Function<R, P> makeToRecord (
Class<R> rclass, final Class<P> pclass)
@@ -104,6 +109,10 @@ public class RuntimeUtil
final Setter[] setters = getPersistentSetters(pclass, rfields);
return new Function<R, P>() {
public P apply (R object) {
if (object == null) {
throw new NullPointerException(
"Cannot convert null runtime record to " + pclass.getSimpleName());
}
try {
P record = pclass.newInstance();
for (int ii = 0, ll = rfields.length; ii < ll; ii++) {