Example usage for org.apache.cassandra.index Index supportsExpression

Introduction

In this page you can find the example usage for org.apache.cassandra.index Index supportsExpression.

Prototype

public boolean supportsExpression(ColumnMetadata column, Operator operator);

Source Link

Document

Called to determine whether this index can provide a searcher to execute a query on the supplied column using the specified operator.

Usage

From source file:com.stratio.cassandra.lucene.IndexPagingState.java

License:Apache License

private Expression expression(ReadCommand command) throws ReflectiveOperationException {

    // Try with custom expressions
    for (Expression expression : command.rowFilter().getExpressions()) {
        if (expression.isCustom()) {
            return expression;
        }/*from ww  w  .jav a2  s  .  c o  m*/
    }

    // Try with dummy column
    ColumnFamilyStore cfs = Keyspace.open(command.metadata().ksName)
            .getColumnFamilyStore(command.metadata().cfName);
    for (Expression expression : command.rowFilter().getExpressions()) {
        for (org.apache.cassandra.index.Index index : cfs.indexManager.listIndexes()) {
            if (index instanceof Index
                    && index.supportsExpression(expression.column(), expression.operator())) {
                return expression;
            }
        }
    }

    return null;
}

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