/
PipelineFunctionUpper.java
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/
PipelineFunctionUpper.java
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/*
* Copyright (c) 2017-2018 Bosch Software Innovations GmbH.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/org/documents/epl-2.0/index.php
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.model.placeholders;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.annotation.concurrent.Immutable;
/**
* Provides the {@code fn:upper()} function implementation.
*/
@Immutable
final class PipelineFunctionUpper implements PipelineFunction {
static final String FUNCTION_NAME = "upper";
private static final String EMPTY_PARENTHESES_PATTERN = "\\(\\)";
private static final Pattern OVERALL_PATTERN = Pattern.compile(EMPTY_PARENTHESES_PATTERN);
@Override
public String getName() {
return FUNCTION_NAME;
}
@Override
public UpperFunctionSignature getSignature() {
return UpperFunctionSignature.INSTANCE;
}
@Override
public Optional<String> apply(final Optional<String> value, final String paramsIncludingParentheses,
final ExpressionResolver expressionResolver) {
// check if signature matches (empty params!)
validateOrThrow(paramsIncludingParentheses);
return value.map(String::toUpperCase);
}
private void validateOrThrow(final String paramsIncludingParentheses) {
final Matcher matcher = OVERALL_PATTERN.matcher(paramsIncludingParentheses);
if (!matcher.matches()) {
throw PlaceholderFunctionSignatureInvalidException.newBuilder(paramsIncludingParentheses, this)
.build();
}
}
/**
* Describes the signature of the {@code upper()} function.
*/
private static final class UpperFunctionSignature implements Signature {
private static final UpperFunctionSignature INSTANCE = new UpperFunctionSignature();
private UpperFunctionSignature() {
}
@Override
public List<ParameterDefinition> getParameterDefinitions() {
return Collections.emptyList();
}
@Override
public <T> ParameterDefinition<T> getParameterDefinition(final int index) {
throw new IllegalArgumentException("Signature does not define a parameter at index '" + index + "'");
}
@Override
public String toString() {
return renderSignature();
}
}
}