software.amazon.awssdk.services.qldb.endpoints.internal.Ref Maven / Gradle / Ivy

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

There is a newer version: 2.28.3

/*
 * 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.qldb.endpoints.internal;

import software.amazon.awssdk.annotations.SdkInternalApi;

/**
 * A reference to a field.
 */
@SdkInternalApi
public class Ref extends Expr {
    private final Identifier name;

    public Ref(Identifier name) {
        this.name = name;
    }

    @Override
    public  R accept(ExprVisitor visitor) {
        return visitor.visitRef(this);
    }

    public Identifier getName() {
        return name;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        Ref ref = (Ref) o;
        return name.equals(ref.name);
    }

    @Override
    public String template() {
        return String.format("{%s}", name);
    }

    @Override
    public String toString() {
        return name.asString();
    }

    @Override
    public int hashCode() {
        return name != null ? name.hashCode() : 0;
    }

    @Override
    public Value eval(Scope scope) {
        return scope.getValue(this.name).orElse(new Value.None());
    }
}