software.amazon.awssdk.services.athena.endpoints.internal.Condition Maven / Gradle / Ivy

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The AWS Java SDK for Amazon Athena module holds the client classes that are used for communicating with Amazon Athena Service

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/*
 * 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.athena.endpoints.internal;

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

@SdkInternalApi
public final class Condition implements Eval, IntoSelf {
    public static final String ASSIGN = "assign";

    private final Expr fn;
    private final Identifier result;

    private Condition(Builder builder) {
        this.fn = builder.fn;
        this.result = builder.result;
    }

    public Expr getFn() {
        return fn;
    }

    public Optional getResult() {
        return Optional.ofNullable(result);
    }

    public static Condition fromNode(JsonNode node) {
        Map objNode = node.asObject();

        Builder b = builder();

        Fn fn = FnNode.fromNode(node).validate();

        b.fn(fn);

        JsonNode assignNode = objNode.get(ASSIGN);
        if (assignNode != null) {
            b.result(assignNode.asString());
        }

        return b.build();
    }

    public static Builder builder() {
        return new Builder();
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        this.getResult().ifPresent(res -> sb.append(res).append(" = "));
        sb.append(this.fn);
        return sb.toString();
    }

    @Override
    public Value eval(Scope scope) {
        Value value = this.fn.eval(scope);
        if (!value.isNone()) {
            this.getResult().ifPresent(res -> scope.insert(res, value));
        }
        return value;
    }

    public Expr expr() {
        if (this.getResult().isPresent()) {
            return Expr.ref(this.getResult().get());
        } else {
            throw new RuntimeException("Cannot generate expr from a condition without a result");
        }
    }

    public static class Builder {
        private Fn fn;
        private Identifier result;

        public Builder fn(Fn fn) {
            this.fn = fn;
            return this;
        }

        public Builder result(String result) {
            this.result = Identifier.of(result);
            return this;
        }

        public Condition build() {
            return new Condition(this);
        }

    }
}