software.amazon.smithy.waiters.Matcher Maven / Gradle / Ivy
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/*
* Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package software.amazon.smithy.waiters;
import java.util.Map;
import java.util.Objects;
import software.amazon.smithy.model.node.ExpectationNotMetException;
import software.amazon.smithy.model.node.Node;
import software.amazon.smithy.model.node.ObjectNode;
import software.amazon.smithy.model.node.StringNode;
import software.amazon.smithy.model.node.ToNode;
/**
* Determines if an acceptor matches the current state of a resource.
*/
public abstract class Matcher implements ToNode {
// A sealed constructor.
private Matcher() {}
/**
* Visits the variants of the Matcher union type.
*
* @param Type of value to return from the visitor.
*/
public interface Visitor {
T visitOutput(OutputMember outputPath);
T visitInputOutput(InputOutputMember inputOutputPath);
T visitSuccess(SuccessMember success);
T visitErrorType(ErrorTypeMember errorType);
T visitUnknown(UnknownMember unknown);
}
/**
* Gets the value of the set matcher variant.
*
* @return Returns the set variant's value.
*/
public abstract T getValue();
/**
* Gets the member name of the matcher.
*
* @return Returns the set member name.
*/
public abstract String getMemberName();
/**
* Visits the Matcher union type.
*
* @param visitor Visitor to apply.
* @param The type returned by the visitor.
* @return Returns the return value of the visitor.
*/
public abstract U accept(Visitor visitor);
@Override
public final int hashCode() {
return Objects.hash(getMemberName(), getValue());
}
@Override
public final boolean equals(Object o) {
if (o == this) {
return true;
} else if (!(o instanceof Matcher)) {
return false;
} else {
Matcher other = (Matcher) o;
return getMemberName().equals(other.getMemberName()) && getValue().equals(other.getValue());
}
}
/**
* Creates a {@code Matcher} from a {@link Node}.
*
* @param node {@code Node} to create a {@code Matcher} from.
* @return Returns the create {@code Matcher}.
* @throws ExpectationNotMetException if the given {@code node} is invalid.
*/
public static Matcher fromNode(Node node) {
ObjectNode value = node.expectObjectNode();
if (value.size() != 1) {
throw new ExpectationNotMetException("Union value must have exactly one value set", node);
}
Map.Entry entry = value.getMembers().entrySet().iterator().next();
String entryKey = entry.getKey().getValue();
Node entryValue = entry.getValue();
switch (entryKey) {
case "output":
return new OutputMember(PathMatcher.fromNode(entryValue));
case "inputOutput":
return new InputOutputMember(PathMatcher.fromNode(entryValue));
case "success":
return new SuccessMember(entryValue.expectBooleanNode().getValue());
case "errorType":
return new ErrorTypeMember(entryValue.expectStringNode().getValue());
default:
return new UnknownMember(entryKey, entryValue);
}
}
private abstract static class PathMatcherMember extends Matcher {
private final String memberName;
private final PathMatcher value;
private PathMatcherMember(String memberName, PathMatcher value) {
this.memberName = memberName;
this.value = value;
}
@Override
public final String getMemberName() {
return memberName;
}
@Override
public final PathMatcher getValue() {
return value;
}
@Override
public final Node toNode() {
return Node.objectNode().withMember(getMemberName(), value.toNode());
}
}
public static final class OutputMember extends PathMatcherMember {
public OutputMember(PathMatcher value) {
super("output", value);
}
@Override
public U accept(Visitor visitor) {
return visitor.visitOutput(this);
}
}
public static final class InputOutputMember extends PathMatcherMember {
public InputOutputMember(PathMatcher value) {
super("inputOutput", value);
}
@Override
public U accept(Visitor visitor) {
return visitor.visitInputOutput(this);
}
}
/**
* Matches if an operation returns an error, and the error matches the
* expected error type.
*/
public static final class ErrorTypeMember extends Matcher {
private final String value;
public ErrorTypeMember(String value) {
this.value = value;
}
@Override
public String getMemberName() {
return "errorType";
}
@Override
public String getValue() {
return value;
}
@Override
public Node toNode() {
return Node.objectNode().withMember(getMemberName(), Node.from(value));
}
@Override
public U accept(Visitor visitor) {
return visitor.visitErrorType(this);
}
}
/**
* When set to true, matches when a call returns a success response.
* When set to false, matches when a call fails with any error.
*/
public static final class SuccessMember extends Matcher {
private final boolean value;
public SuccessMember(boolean value) {
this.value = value;
}
@Override
public String getMemberName() {
return "success";
}
@Override
public Boolean getValue() {
return value;
}
@Override
public Node toNode() {
return Node.objectNode().withMember(getMemberName(), Node.from(value));
}
@Override
public U accept(Visitor visitor) {
return visitor.visitSuccess(this);
}
}
/**
* Represents an union value.
*/
public static final class UnknownMember extends Matcher {
private final String key;
private final Node value;
public UnknownMember(String key, Node value) {
this.key = key;
this.value = value;
}
@Override
public String getMemberName() {
return key;
}
@Override
public Node getValue() {
return value;
}
@Override
public Node toNode() {
return Node.objectNode().withMember(getMemberName(), getValue());
}
@Override
public U accept(Visitor visitor) {
return visitor.visitUnknown(this);
}
}
}