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Implement getField CEL function #271

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Merged
2 commits merged into from
Apr 23, 2025
Merged

Implement getField CEL function #271

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90322d7
Implement getField CEL function
Apr 22, 2025
5d9b72d
Merge branch 'main' of https://github.com/bufbuild/protovalidate-java…
Apr 23, 2025
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7 changes: 7 additions & 0 deletions src/main/java/build/buf/protovalidate/CustomDeclarations.java
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,13 @@ static List<Decl> create() {
// Add 'now' variable declaration
decls.add(Decls.newVar("now", Decls.newObjectType(TimestampT.TimestampType.typeName())));

// Add 'getField' function declaration
decls.add(
Decls.newFunction(
"getField",
Decls.newOverload(
"get_field_any_string", Arrays.asList(Decls.Any, Decls.String), Decls.Any)));

// Add 'isIp' function declaration
decls.add(
Decls.newFunction(
Expand Down
29 changes: 29 additions & 0 deletions src/main/java/build/buf/protovalidate/CustomOverload.java
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,8 @@

package build.buf.protovalidate;

import com.google.protobuf.Descriptors;
import com.google.protobuf.Message;
import java.util.HashSet;
import java.util.Set;
import java.util.regex.Pattern;
Expand All @@ -23,6 +25,7 @@
import org.projectnessie.cel.common.types.ListT;
import org.projectnessie.cel.common.types.StringT;
import org.projectnessie.cel.common.types.Types;
import org.projectnessie.cel.common.types.pb.DefaultTypeAdapter;
import org.projectnessie.cel.common.types.ref.TypeEnum;
import org.projectnessie.cel.common.types.ref.Val;
import org.projectnessie.cel.common.types.traits.Lister;
Expand All @@ -31,6 +34,7 @@
/** Defines custom function overloads (the implementation). */
final class CustomOverload {

private static final String OVERLOAD_GET_FIELD = "getField";
private static final String OVERLOAD_FORMAT = "format";
private static final String OVERLOAD_UNIQUE = "unique";
private static final String OVERLOAD_STARTS_WITH = "startsWith";
Expand Down Expand Up @@ -58,6 +62,7 @@ final class CustomOverload {
*/
static Overload[] create() {
return new Overload[] {
celGetField(),
celFormat(),
celUnique(),
celStartsWith(),
Expand All @@ -75,6 +80,30 @@ static Overload[] create() {
};
}

/**
* Creates a custom function overload for the "getField" operation.
*
* @return The {@link Overload} instance for the "getField" operation.
*/
private static Overload celGetField() {
return Overload.binary(
OVERLOAD_GET_FIELD,
(msgarg, namearg) -> {
if (msgarg.type().typeEnum() != TypeEnum.Object
|| namearg.type().typeEnum() != TypeEnum.String) {
return Err.newErr("no such overload");
}
Message message = msgarg.convertToNative(Message.class);
String fieldName = namearg.convertToNative(String.class);
Descriptors.FieldDescriptor field =
message.getDescriptorForType().findFieldByName(fieldName);
if (field == null) {
return Err.newErr("no such field: " + fieldName);
}
return DefaultTypeAdapter.Instance.nativeToValue(message.getField(field));
});
}

/**
* Creates a custom binary function overload for the "format" operation.
*
Expand Down