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package com.salesforce.phoenix.compile;
import java.sql.SQLException;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import com.salesforce.phoenix.expression.Expression;
import com.salesforce.phoenix.schema.PDataType;
import com.salesforce.phoenix.schema.tuple.Tuple;
/**
*
* Projector for getting value from a select statement for an expression
*
* @author jtaylor
* @since 0.1
*/
public class ExpressionProjector implements ColumnProjector {
private final String name;
private final Expression expression;
private final String tableName;
private final boolean isCaseSensitive;
public ExpressionProjector(String name, String tableName, Expression expression, boolean isCaseSensitive) {
this.name = name;
this.expression = expression;
this.tableName = tableName;
this.isCaseSensitive = isCaseSensitive;
}
@Override
public String getTableName() {
return tableName;
}
@Override
public Expression getExpression() {
return expression;
}
@Override
public String getName() {
return name;
}
@Override
public final Object getValue(Tuple tuple, PDataType type, ImmutableBytesWritable ptr) throws SQLException {
try {
Expression expression = getExpression();
if (!expression.evaluate(tuple, ptr)) {
return null;
}
if (ptr.getLength() == 0) {
return null;
}
return type.toObject(ptr, expression.getDataType(), expression.getColumnModifier());
} catch (RuntimeException e) {
// FIXME: Expression.evaluate does not throw SQLException
// so this will unwrap throws from that.
if (e.getCause() instanceof SQLException) {
throw (SQLException) e.getCause();
}
throw e;
}
}
@Override
public boolean isCaseSensitive() {
return isCaseSensitive;
}
}