Example usage for com.amazonaws.services.dynamodbv2.model KeysAndAttributes setExpressionAttributeNames

Introduction

In this page you can find the example usage for com.amazonaws.services.dynamodbv2.model KeysAndAttributes setExpressionAttributeNames.

Prototype

public void setExpressionAttributeNames(java.util.Map<String, String> expressionAttributeNames) 

Source Link

Document

One or more substitution tokens for attribute names in an expression.

Usage

From source file:org.iternine.jeppetto.dao.dynamodb.DynamoDBQueryModelDAO.java

License:Apache License

@Override
public Iterable<T> findByIds(ID... ids) throws JeppettoException {
    Collection<Map<String, AttributeValue>> keys = new ArrayList<Map<String, AttributeValue>>();

    for (ID id : ids) {
        keys.add(getKeyFrom(id));/*from w  ww.ja v  a 2s  .c o m*/
    }

    KeysAndAttributes keysAndAttributes = new KeysAndAttributes().withKeys(keys);

    keysAndAttributes.setConsistentRead(consistentRead);
    keysAndAttributes.setProjectionExpression(projectionExpression);

    if (!projectionExpressionNames.isEmpty()) {
        keysAndAttributes.setExpressionAttributeNames(projectionExpressionNames);
    }

    BatchGetItemRequest batchGetItemRequest = new BatchGetItemRequest()
            .withRequestItems(Collections.singletonMap(tableName, keysAndAttributes));

    return new BatchGetIterable<T>(dynamoDB, persistableEnhancer, batchGetItemRequest, tableName);
}

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