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119 changes: 119 additions & 0 deletions
119
sql/src/main/java/io/crate/operation/scalar/cast/AbstractCastFunction.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| /* | ||
| * Licensed to Crate under one or more contributor license agreements. | ||
| * See the NOTICE file distributed with this work for additional | ||
| * information regarding copyright ownership. Crate licenses this file | ||
| * to you 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 | ||
| * | ||
| * http://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. | ||
| * | ||
| * However, if you have executed another commercial license agreement | ||
| * with Crate these terms will supersede the license and you may use the | ||
| * software solely pursuant to the terms of the relevant commercial | ||
| * agreement. | ||
| */ | ||
|
|
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| package io.crate.operation.scalar.cast; | ||
|
|
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| import com.google.common.base.Preconditions; | ||
| import com.google.common.base.Throwables; | ||
| import io.crate.analyze.symbol.Function; | ||
| import io.crate.analyze.symbol.Literal; | ||
| import io.crate.analyze.symbol.Symbol; | ||
| import io.crate.analyze.symbol.SymbolFormatter; | ||
| import io.crate.exceptions.ConversionException; | ||
| import io.crate.metadata.DynamicFunctionResolver; | ||
| import io.crate.metadata.FunctionImplementation; | ||
| import io.crate.metadata.FunctionInfo; | ||
| import io.crate.metadata.Scalar; | ||
| import io.crate.operation.Input; | ||
| import io.crate.types.DataType; | ||
|
|
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| import java.util.List; | ||
| import java.util.Locale; | ||
|
|
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| public abstract class AbstractCastFunction<From, To> extends Scalar<To,From> { | ||
|
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| protected final DataType<To> returnType; | ||
| protected final FunctionInfo info; | ||
|
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| protected AbstractCastFunction(FunctionInfo info) { | ||
| this.info = info; | ||
| this.returnType = info.returnType(); | ||
| } | ||
|
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| @Override | ||
| public To evaluate(Input<From>... args) { | ||
| assert args.length == 1 : "Number of arguments must be 1"; | ||
| From value = args[0].value(); | ||
| try { | ||
| return returnType.value(value); | ||
| } catch (ClassCastException | IllegalArgumentException | ConversionException e) { | ||
| return onEvaluateException(value, e); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public FunctionInfo info() { | ||
| return info; | ||
| } | ||
|
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| @Override | ||
| public Symbol normalizeSymbol(Function symbol) { | ||
| assert symbol.arguments().size() == 1 : "Number of arguments must be 1"; | ||
| Symbol argument = symbol.arguments().get(0); | ||
| if (argument.symbolType().isValueSymbol()) { | ||
| Object value = ((Input) argument).value(); | ||
| try { | ||
| return Literal.newLiteral(returnType, returnType.value(value)); | ||
| } catch (ClassCastException | IllegalArgumentException | ConversionException e) { | ||
| return onNormalizeException(argument, e); | ||
| } | ||
| } | ||
| return symbol; | ||
| } | ||
|
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| protected Symbol onNormalizeException(Symbol argument, Throwable t) { | ||
| throw new IllegalArgumentException( | ||
| String.format(Locale.ENGLISH, "cannot cast %s to %s", | ||
| SymbolFormatter.format(argument), returnType), t); | ||
| } | ||
|
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| protected To onEvaluateException(From argument, Throwable t) { | ||
| Throwables.propagate(t); | ||
| return null; | ||
| } | ||
|
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| protected abstract static class Resolver implements DynamicFunctionResolver { | ||
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| protected final String name; | ||
| protected final DataType dataType; | ||
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| protected Resolver(DataType dataType, String name) { | ||
| this.name = name; | ||
| this.dataType = dataType; | ||
| } | ||
|
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| protected void checkPreconditions(List<DataType> dataTypes) { | ||
| Preconditions.checkArgument(dataTypes.size() == 1, | ||
| "invalid size of arguments, 1 expected"); | ||
| DataType convertFrom = dataTypes.get(0); | ||
| Preconditions.checkArgument(convertFrom.isConvertableTo(dataType), "type '%s' not supported for conversion to '%s'", convertFrom, dataType); | ||
| } | ||
|
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| protected abstract FunctionImplementation<Function> createInstance(List<DataType> types); | ||
|
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| @Override | ||
| public FunctionImplementation<Function> getForTypes(List<DataType> dataTypes) throws IllegalArgumentException { | ||
| checkPreconditions(dataTypes); | ||
| return createInstance(dataTypes); | ||
| } | ||
| } | ||
| } |
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