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115
common/src/main/java/dev/cel/common/values/ProtoWrapperValue.java
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| // Copyright 2023 Google LLC | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // https://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package dev.cel.common.values; | ||
|
|
||
| import com.google.auto.value.AutoValue; | ||
| import com.google.errorprone.annotations.Immutable; | ||
| import com.google.protobuf.ByteString; | ||
| import com.google.protobuf.FloatValue; | ||
| import com.google.protobuf.Int32Value; | ||
| import com.google.protobuf.Int64Value; | ||
| import com.google.protobuf.MessageOrBuilder; | ||
| import com.google.protobuf.UInt32Value; | ||
| import com.google.protobuf.UInt64Value; | ||
| import dev.cel.common.internal.WellKnownProto; | ||
| import dev.cel.common.types.NullableType; | ||
|
|
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| /** ProtoWrapperValue represents a */ | ||
| @Immutable | ||
| @AutoValue | ||
| public abstract class ProtoWrapperValue extends StructValue { | ||
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| @Override | ||
| public abstract CelValue value(); | ||
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| abstract WellKnownProto wellKnownProto(); | ||
|
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| /** | ||
| * Retrieves the underlying value being held in the wrapper. For example, if this is a | ||
| * `google.protobuf.IntValue', a Java long is returned. | ||
| */ | ||
| public Object nativeValue() { | ||
| if (wellKnownProto().equals(WellKnownProto.BYTES_VALUE)) { | ||
| // Return the proto ByteString as the underlying primitive value rather than a mutable byte | ||
| // array. | ||
| return ByteString.copyFrom(((BytesValue) value()).value().toByteArray()); | ||
| } | ||
| return value().value(); | ||
| } | ||
|
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| @Override | ||
| public abstract NullableType celType(); | ||
|
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| @Override | ||
| public boolean isZeroValue() { | ||
| return value().isZeroValue(); | ||
| } | ||
|
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| @Override | ||
| public CelValue select(String fieldName) { | ||
| throw new UnsupportedOperationException("Wrappers do not support field selection"); | ||
| } | ||
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| @Override | ||
| public boolean hasField(String fieldName) { | ||
| throw new UnsupportedOperationException("Wrappers do not support presence tests"); | ||
| } | ||
|
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| public static ProtoWrapperValue create( | ||
| MessageOrBuilder wrapperMessage, boolean enableUnsignedLongs) { | ||
| WellKnownProto wellKnownProto = getWellKnownProtoFromWrapperName(wrapperMessage); | ||
| CelValue celValue = newCelValueFromWrapper(wrapperMessage, wellKnownProto, enableUnsignedLongs); | ||
| NullableType nullableType = NullableType.create(celValue.celType()); | ||
| return new AutoValue_ProtoWrapperValue(celValue, wellKnownProto, nullableType); | ||
| } | ||
|
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| private static CelValue newCelValueFromWrapper( | ||
| MessageOrBuilder message, WellKnownProto wellKnownProto, boolean enableUnsignedLongs) { | ||
| switch (wellKnownProto) { | ||
| case BOOL_VALUE: | ||
| return BoolValue.create(((com.google.protobuf.BoolValue) message).getValue()); | ||
| case BYTES_VALUE: | ||
| return BytesValue.create( | ||
| CelByteString.of(((com.google.protobuf.BytesValue) message).getValue().toByteArray())); | ||
| case DOUBLE_VALUE: | ||
| return DoubleValue.create(((com.google.protobuf.DoubleValue) message).getValue()); | ||
| case FLOAT_VALUE: | ||
| return DoubleValue.create(((FloatValue) message).getValue()); | ||
| case INT32_VALUE: | ||
| return IntValue.create(((Int32Value) message).getValue()); | ||
| case INT64_VALUE: | ||
| return IntValue.create(((Int64Value) message).getValue()); | ||
| case STRING_VALUE: | ||
| return StringValue.create(((com.google.protobuf.StringValue) message).getValue()); | ||
| case UINT32_VALUE: | ||
| return UintValue.create(((UInt32Value) message).getValue(), enableUnsignedLongs); | ||
| case UINT64_VALUE: | ||
| return UintValue.create(((UInt64Value) message).getValue(), enableUnsignedLongs); | ||
| default: | ||
| throw new IllegalArgumentException( | ||
| "Should only be called for wrapper types. Got: " + wellKnownProto.name()); | ||
| } | ||
| } | ||
|
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| private static WellKnownProto getWellKnownProtoFromWrapperName(MessageOrBuilder message) { | ||
| WellKnownProto wellKnownProto = | ||
| WellKnownProto.getByDescriptorName(message.getDescriptorForType().getFullName()); | ||
| if (!wellKnownProto.isWrapperType()) { | ||
| throw new IllegalArgumentException("Expected a wrapper type. Got: " + wellKnownProto.name()); | ||
| } | ||
|
|
||
| return wellKnownProto; | ||
| } | ||
| } |
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