software.amazon.awssdk.services.kafka.endpoints.internal.Expr Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of kafka Show documentation

The AWS Java SDK for Kafka module holds the client classes that are used for communicating with Kafka.

There is a newer version: 2.29.15

/*
 * Copyright 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.awssdk.services.kafka.endpoints.internal;

import java.util.Map;
import software.amazon.awssdk.annotations.SdkInternalApi;
import software.amazon.awssdk.protocols.jsoncore.JsonNode;

@SdkInternalApi
public abstract class Expr implements Eval {

    public abstract  R accept(ExprVisitor visitor);

    public GetAttr getAttr(String path) {
        return GetAttr.builder().target(this).path(path).build();
    }

    public GetAttr getAttr(Identifier path) {
        return GetAttr.builder().target(this).path(path.asString()).build();
    }

    public static Expr fromNode(JsonNode node) {
        if (node.isObject()) {
            Map objNode = node.asObject();
            JsonNode ref = objNode.get("ref");
            JsonNode fn = objNode.get("fn");
            if ((ref != null ? 1 : 0) + (fn != null ? 1 : 0) != 1) {
                throw SourceException.builder().message("expected exactly one of `ref` or `fn` to be set").build();
            }
            if (ref != null) {
                return ref(Identifier.of(ref.asString()));
            }
            return RuleError.ctx("while parsing fn", () -> FnNode.fromNode(node).validate());
        } else if (node.isString()) {
            return Literal.fromStr(node.asString());
        } else {
            return Literal.fromNode(node);
        }
    }

    /**
     * Parse a value from a "short form" used within a template
     *
     * @param shortForm
     * @return
     */
    public static Expr parseShortform(String shortForm) {
        return RuleError.ctx("while parsing `" + shortForm + "` within a template", () -> {
            if (shortForm.contains("#")) {
                String[] parts = shortForm.split("#", 2);
                String base = parts[0];
                String pattern = parts[1];
                return GetAttr.builder().target(ref(Identifier.of(base))).path(pattern).build();
            } else {
                return ref(Identifier.of(shortForm));
            }
        });
    }

    public String template() {
        throw new RuntimeException(String.format("cannot convert %s to a string template", this));
    }

    public static Ref ref(Identifier name) {
        return new Ref(name);
    }

    public static Expr of(boolean value) {
        return Literal.fromBool(value);
    }

    public static Expr of(int value) {
        return Literal.fromInteger(value);
    }

    public static Expr of(String value) {
        return Literal.fromStr(value);
    }

}