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

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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.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 set = (Set) value;
            if (set.size() == 0)
                return value;
            Object element = set.iterator().next();
            if (element instanceof String) {
                return value;
            } else if (element instanceof BigDecimal) {
                return value;
            } else if (element instanceof Number) {
                @SuppressWarnings("unchecked")
                Set in = (Set) value;
                Set out = new LinkedHashSet(set.size());
                for (Number n : in)
                    out.add(InternalUtils.toBigDecimal(n));
                return out;
            } else if (element instanceof byte[]) {
                return value;
            } else if (element instanceof ByteBuffer) {
                @SuppressWarnings("unchecked")
                Set bs = (Set) value;
                Set out = new LinkedHashSet(bs.size());
                for (ByteBuffer bb: bs)
                    out.add(copyBytesFrom(bb));
                return out;
            } else {
                throw new UnsupportedOperationException("element type: "
                        + element.getClass());
            }
        } else if (value instanceof List) {
            @SuppressWarnings("unchecked")
            List in = (List) value;
            if (in.size() == 0)
                return in;
            List out = new ArrayList();
            for (Object v : in)
                out.add(transform(v));
            return out;
        } else if (value instanceof Map) {
            @SuppressWarnings("unchecked")
            Map in = (Map) value;
            if (in.size() == 0)
                return in;
            Map out = new LinkedHashMap(in.size());
            for (Map.Entry e : in.entrySet())
                out.put(e.getKey(), transform(e.getValue()));
            return out;
        } else {
            throw new UnsupportedOperationException("value type: "
                    + value.getClass());
        }
    }
}    
    
    
    

    




    
    
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