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Add dev.cel.runtime.CelFunctionBinding
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71 changes: 71 additions & 0 deletions
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runtime/src/main/java/dev/cel/runtime/CelFunctionBinding.java
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| // Copyright 2025 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. | ||
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| package dev.cel.runtime; | ||
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| import com.google.common.collect.ImmutableList; | ||
| import com.google.errorprone.annotations.Immutable; | ||
| import dev.cel.common.annotations.Internal; | ||
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| /** | ||
| * Binding consisting of an overload id, a Java-native argument signature, and an overload | ||
| * definition. | ||
| * | ||
| * <p>While the CEL function has a human-readable {@code camelCase} name, overload ids should use | ||
| * the following convention where all {@code <type>} names should be ASCII lower-cased. For types | ||
| * prefer the unparameterized simple name of time, or unqualified name of any proto-based type: | ||
| * | ||
| * <ul> | ||
| * <li>unary member function: <type>_<function> | ||
| * <li>binary member function: <type>_<function>_<arg_type> | ||
| * <li>unary global function: <function>_<type> | ||
| * <li>binary global function: <function>_<arg_type1>_<arg_type2> | ||
| * <li>global function: <function>_<arg_type1>_<arg_type2>_<arg_typeN> | ||
| * </ul> | ||
| * | ||
| * <p>Examples: string_startsWith_string, mathMax_list, lessThan_money_money | ||
| */ | ||
| @Internal | ||
| @Immutable | ||
| public interface CelFunctionBinding { | ||
| String getOverloadId(); | ||
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| ImmutableList<Class<?>> getArgTypes(); | ||
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| CelFunctionOverload getDefinition(); | ||
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| /** Create a unary function binding from the {@code overloadId}, {@code arg}, and {@code impl}. */ | ||
| @SuppressWarnings("unchecked") | ||
| static <T> CelFunctionBinding from( | ||
| String overloadId, Class<T> arg, CelFunctionOverload.Unary<T> impl) { | ||
| return from(overloadId, ImmutableList.of(arg), (args) -> impl.apply((T) args[0])); | ||
| } | ||
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| /** | ||
| * Create a binary function binding from the {@code overloadId}, {@code arg1}, {@code arg2}, and | ||
| * {@code impl}. | ||
| */ | ||
| @SuppressWarnings("unchecked") | ||
| static <T1, T2> CelFunctionBinding from( | ||
| String overloadId, Class<T1> arg1, Class<T2> arg2, CelFunctionOverload.Binary<T1, T2> impl) { | ||
| return from( | ||
| overloadId, ImmutableList.of(arg1, arg2), (args) -> impl.apply((T1) args[0], (T2) args[1])); | ||
| } | ||
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| /** Create a function binding from the {@code overloadId}, {@code argTypes}, and {@code impl}. */ | ||
| static CelFunctionBinding from( | ||
| String overloadId, Iterable<Class<?>> argTypes, CelFunctionOverload impl) { | ||
| return new FunctionBindingImpl(overloadId, ImmutableList.copyOf(argTypes), impl); | ||
| } | ||
| } |
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runtime/src/main/java/dev/cel/runtime/FunctionBindingImpl.java
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| @@ -0,0 +1,50 @@ | ||
| // Copyright 2025 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. | ||
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| package dev.cel.runtime; | ||
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| import com.google.common.collect.ImmutableList; | ||
| import com.google.errorprone.annotations.Immutable; | ||
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| @Immutable | ||
| final class FunctionBindingImpl implements CelFunctionBinding { | ||
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| private final String overloadId; | ||
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| private final ImmutableList<Class<?>> argTypes; | ||
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| private final CelFunctionOverload definition; | ||
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| @Override | ||
| public String getOverloadId() { | ||
| return overloadId; | ||
| } | ||
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| @Override | ||
| public ImmutableList<Class<?>> getArgTypes() { | ||
| return argTypes; | ||
| } | ||
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| @Override | ||
| public CelFunctionOverload getDefinition() { | ||
| return definition; | ||
| } | ||
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| FunctionBindingImpl( | ||
| String overloadId, ImmutableList<Class<?>> argTypes, CelFunctionOverload definition) { | ||
| this.overloadId = overloadId; | ||
| this.argTypes = argTypes; | ||
| this.definition = definition; | ||
| } | ||
| } |
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