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PipelineFunctionLower.java
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PipelineFunctionLower.java
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/*
* Copyright (c) 2021 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.placeholders;
import java.util.Collections;
import java.util.List;
import java.util.stream.Stream;
import javax.annotation.concurrent.Immutable;
/**
* Provides the {@code fn:lower()} function implementation.
*/
@Immutable
final class PipelineFunctionLower implements PipelineFunction {
private static final String FUNCTION_NAME = "lower";
@Override
public String getName() {
return FUNCTION_NAME;
}
@Override
public LowerFunctionSignature getSignature() {
return LowerFunctionSignature.INSTANCE;
}
@Override
public PipelineElement apply(final PipelineElement element, final String paramsIncludingParentheses,
final ExpressionResolver expressionResolver) {
// check if signature matches (empty params!)
validateOrThrow(paramsIncludingParentheses);
return element.map(String::toLowerCase);
}
@Override
public Stream<PipelineElement> applyStreaming(final PipelineElement element, final String paramsIncludingParentheses,
final ExpressionResolver expressionResolver) {
return Stream.of(apply(element, paramsIncludingParentheses, expressionResolver))
; }
private void validateOrThrow(final String paramsIncludingParentheses) {
if (!PipelineFunctionParameterResolverFactory.forEmptyParameters().test(paramsIncludingParentheses)) {
throw PlaceholderFunctionSignatureInvalidException.newBuilder(paramsIncludingParentheses, this)
.build();
}
}
/**
* Describes the signature of the {@code lower()} function.
*/
private static final class LowerFunctionSignature implements Signature {
private static final LowerFunctionSignature INSTANCE = new LowerFunctionSignature();
private LowerFunctionSignature() {
}
@Override
public List<ParameterDefinition<?>> getParameterDefinitions() {
return Collections.emptyList();
}
@Override
public String toString() {
return renderSignature();
}
}
}