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

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/*
 * Copyright 2015-2022 Amazon Technologies, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *    http://aws.amazon.com/apache2.0
 *
 * 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.xspec;

import java.util.Collections;
import java.util.Map;

import com.amazonaws.annotation.Beta;

/**
 * Expression specification for making scan request to Amazon DynamoDB.
 * 

* Even though the internal name map and value map are unmodifiable, this object * is only as unmodifiable as the underlying values in it's value map. In turn, * the values in the value maps are essentially provided by the users of this * library. In other words, this object is thread-safe as long as the underlying * values provided by the users are thread-safe. */ @Beta public final class ScanExpressionSpec extends ExpressionSpec { private final String projectionExpression; private final String filterExpression; private final Map nameMap; private final Map valueMap; ScanExpressionSpec(ExpressionSpecBuilder builder) { SubstitutionContext context = new SubstitutionContext(); this.filterExpression = builder.buildConditionExpression(context); this.projectionExpression = builder.buildProjectionExpression(context); final Map nameMap = context.getNameMap(); this.nameMap = nameMap == null ? null : Collections.unmodifiableMap(nameMap); Map valueMap = context.getValueMap(); this.valueMap = valueMap == null ? null : Collections.unmodifiableMap(valueMap); } /** * Returns the projection expression; or null if there is none. */ public String getProjectionExpression() { return projectionExpression; } /** * Returns the condition expression; or null if there is none. */ public String getFilterExpression() { return filterExpression; } /** * Returns the name map which is unmodifiable; or null if there is none. */ @Override public Map getNameMap() { return nameMap; } /** * Returns the value map which is unmodifiable; or null if there is none. */ public Map getValueMap() { return valueMap; } }





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