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PipelineElementResolved.java
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PipelineElementResolved.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.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import javax.annotation.concurrent.Immutable;
import org.eclipse.ditto.base.model.common.ConditionChecker;
/**
* Pipeline elements containing a resolved value.
*/
@Immutable
final class PipelineElementResolved implements PipelineElement {
private final List<String> values;
private PipelineElementResolved(final Collection<String> values) {
this.values = Collections.unmodifiableList(new ArrayList<>(ConditionChecker.checkNotEmpty(values, "values")));
}
static PipelineElement of(final Collection<String> values) {
return new PipelineElementResolved(values);
}
@Override
public Type getType() {
return Type.RESOLVED;
}
@Override
public PipelineElement onResolved(final Function<String, PipelineElement> stringProcessor) {
return values.stream()
.map(stringProcessor)
.reduce(PipelineElement::concat)
.orElse(PipelineElement.unresolved());
}
@Override
public PipelineElement onUnresolved(final Supplier<PipelineElement> nextPipelineElement) {
return this;
}
@Override
public PipelineElement onDeleted(final Supplier<PipelineElement> nextPipelineElement) {
return this;
}
@Override
public PipelineElement concat(final PipelineElement pipelineElement) {
if (pipelineElement.getType() == Type.DELETED) {
return pipelineElement;
}
final List<String> concatenatedValues = Stream.concat(toStream(), pipelineElement.toStream())
.collect(Collectors.toList());
return PipelineElementResolved.of(concatenatedValues);
}
@Override
public <T> List<T> evaluate(final PipelineElementVisitor<T> visitor) {
return values.stream()
.map(visitor::resolved)
.collect(Collectors.toList());
}
@Override
public Iterator<String> iterator() {
return values.iterator();
}
@Override
public Stream<String> toStream() {
return values.stream();
}
@Override
public boolean equals(final Object that) {
if (that instanceof PipelineElementResolved) {
return Objects.equals(values, ((PipelineElementResolved) that).values);
} else {
return false;
}
}
@Override
public int hashCode() {
return values.hashCode();
}
@Override
public String toString() {
return getClass().getSimpleName() + "[" + values + "]";
}
}