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ImmutableArrayPipeline.java
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ImmutableArrayPipeline.java
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/*
* Copyright (c) 2022 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 static org.eclipse.ditto.placeholders.Expression.SEPARATOR;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.stream.Stream;
import javax.annotation.concurrent.Immutable;
/**
* Immutable implementation of {@link Pipeline} able to execute its {@link FunctionExpression}s.
*/
@Immutable
final class ImmutableArrayPipeline implements ArrayPipeline {
private final ArrayFunctionExpression functionExpression;
private final List<String> stageExpressions;
ImmutableArrayPipeline(final ArrayFunctionExpression functionExpression, final List<String> stageExpressions) {
this.functionExpression = functionExpression;
this.stageExpressions = Collections.unmodifiableList(new ArrayList<>(stageExpressions));
}
@Override
public Stream<PipelineElement> execute(final PipelineElement pipelineInput,
final ExpressionResolver expressionResolver) {
Stream<PipelineElement> input = Stream.of(pipelineInput);
for (final String expression : stageExpressions) {
input = input.flatMap(element -> combineElements(element,
functionExpression.resolve(expression, element, expressionResolver)));
}
return input;
}
@Override
public void validate() {
stageExpressions.stream()
.map(expression -> expression.replaceFirst(
functionExpression.getPrefix() + SEPARATOR, ""))
.forEach(expression -> {
if (!functionExpression.supports(expression)) {
throw PlaceholderFunctionUnknownException.newBuilder(expression).build();
}
});
}
@Override
public boolean equals(final Object o) {
if (this == o) {
return true;
}
if (!(o instanceof ImmutableArrayPipeline)) {
return false;
}
final ImmutableArrayPipeline that = (ImmutableArrayPipeline) o;
return Objects.equals(functionExpression, that.functionExpression) &&
Objects.equals(stageExpressions, that.stageExpressions);
}
@Override
public int hashCode() {
return Objects.hash(functionExpression, stageExpressions);
}
@Override
public String toString() {
return getClass().getSimpleName() + " [" +
"functionExpression=" + functionExpression +
", stageExpressions=" + stageExpressions +
"]";
}
private static Stream<PipelineElement> combineElements(final PipelineElement self,
final Stream<PipelineElement> other) {
return other.map(element -> self.onDeleted(() -> self)
.onUnresolved(() -> element)
.onResolved(s -> element.onDeleted(() -> element)
.onUnresolved(() -> self)
.onResolved(resolved -> element)
));
}
}