-
Notifications
You must be signed in to change notification settings - Fork 215
/
PipelineElementUnresolved.java
74 lines (61 loc) · 1.9 KB
/
PipelineElementUnresolved.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
/*
* 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.Iterator;
import java.util.List;
import java.util.function.Function;
import java.util.function.Supplier;
import javax.annotation.concurrent.Immutable;
/**
* The unique pipeline element signifying failed resolution.
*/
@Immutable
final class PipelineElementUnresolved implements PipelineElement {
static final PipelineElement INSTANCE = new PipelineElementUnresolved();
private PipelineElementUnresolved() {
// no-op
}
@Override
public Type getType() {
return Type.UNRESOLVED;
}
@Override
public PipelineElement onResolved(final Function<String, PipelineElement> stringProcessor) {
return this;
}
@Override
public PipelineElement onUnresolved(final Supplier<PipelineElement> nextPipelineElement) {
return nextPipelineElement.get();
}
@Override
public PipelineElement onDeleted(final Supplier<PipelineElement> nextPipelineElement) {
return this;
}
@Override
public PipelineElement concat(final PipelineElement pipelineElement) {
return pipelineElement;
}
@Override
public <T> List<T> evaluate(final PipelineElementVisitor<T> visitor) {
return Collections.singletonList(visitor.unresolved());
}
@Override
public Iterator<String> iterator() {
return Collections.emptyIterator();
}
@Override
public String toString() {
return getClass().getSimpleName();
}
}