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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2014-2016 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 com.amazonaws.services.dynamodbv2.document;

import com.amazonaws.services.dynamodbv2.document.internal.InternalUtils;

/**
 * A key/value pair.
 */
public class Attribute {
    private final String name;
    private final Object value;

    public Attribute(String attrName, Object value) {
        InternalUtils.checkInvalidAttrName(attrName);
        this.name = attrName;
        this.value = value;
    }

    public String getName() {
        return name;
    }

    public Object getValue() {
        return value;
    }

    @Override
    public String toString() {
        return "{" + name + ": " + value + "}";
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int hashCode = 1;
        // attribute name is never null as enforced in ctor
        hashCode = prime * hashCode + getName().hashCode();
        hashCode = prime * hashCode
                + ((getValue() == null) ? 0 : getValue().hashCode());
        return hashCode;
    }

    @Override
    public boolean equals(Object in) {
        if (in instanceof Attribute) {
            Attribute that = (Attribute)in;
            if (this.name.equals(that.name)) {
                if (this.value == null)
                    return that.value == null;
                else
                    return this.value.equals(that.value);
            }
        }
        return false;
    }
}