Example usage for com.amazonaws.services.dynamodbv2.datamodeling DynamoDBQueryExpression setFilterExpression

Introduction

In this page you can find the example usage for com.amazonaws.services.dynamodbv2.datamodeling DynamoDBQueryExpression setFilterExpression.

Prototype

public void setFilterExpression(String filterExpression) 

Source Link

Document

Evaluates the query results and returns only the desired values.

Usage

From source file:org.openhab.persistence.dynamodb.internal.DynamoDBPersistenceService.java

License:Open Source License

private void maybeAddStateFilter(FilterCriteria filter,
        final DynamoDBQueryExpression<DynamoDBItem<?>> queryExpression) {
    if (filter.getOperator() != null && filter.getState() != null) {
        // Convert filter's state to DynamoDBItem in order get suitable string representation for the state
        final DynamoDBItem<?> filterState = AbstractDynamoDBItem.fromState(filter.getItemName(),
                filter.getState(), new Date());
        queryExpression.setFilterExpression(String.format("%s %s :opstate",
                DynamoDBItem.ATTRIBUTE_NAME_ITEMSTATE, operatorAsString(filter.getOperator())));

        filterState.accept(new DynamoDBItemVisitor() {

            @Override/* w  w w  .j  a  v a  2s  .  c  o  m*/
            public void visit(DynamoDBStringItem dynamoStringItem) {
                queryExpression.setExpressionAttributeValues(
                        ImmutableMap.of(":opstate", new AttributeValue().withS(dynamoStringItem.getState())));
            }

            @Override
            public void visit(DynamoDBBigDecimalItem dynamoBigDecimalItem) {
                queryExpression.setExpressionAttributeValues(ImmutableMap.of(":opstate",
                        new AttributeValue().withN(dynamoBigDecimalItem.getState().toPlainString())));
            }
        });

    }
}

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