com.amazonaws.services.dynamodbv2.document.internal.ItemValueConformer Maven / Gradle / Ivy

/*
 * Copyright 2014-2019 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.internal;

import static com.amazonaws.util.BinaryUtils.copyBytesFrom;

import java.math.BigDecimal;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * Used to standardize a given Item's value into a standard
 * internal representation (for purposes such as equality comparison.)
 */
public class ItemValueConformer extends ValueTransformer {
    /**
     * This method is assumed to be called for the purpose of a setter method
     * invocation, but NOT a getter method invocation.
     */
    @Override public Object transform(Object value) {
        if (value == null) {
            return value;
        } else if (value instanceof Boolean) {
            return value;
        } else if (value instanceof String) {
            return value;
        } else if (value instanceof Number) {
            return InternalUtils.toBigDecimal((Number)value);
        } else if (value instanceof byte[]) {
            return value;
        } else if (value instanceof ByteBuffer) {
            return copyBytesFrom((ByteBuffer)value);
        } else if (value instanceof Set) {
            @SuppressWarnings("unchecked")
            Set