| package edu.uci.ics.asterix.om.typecomputer.impl; |
| |
| import java.util.Iterator; |
| |
| import org.apache.commons.lang3.mutable.Mutable; |
| |
| import edu.uci.ics.asterix.om.base.AString; |
| import edu.uci.ics.asterix.om.constants.AsterixConstantValue; |
| import edu.uci.ics.asterix.om.typecomputer.base.IResultTypeComputer; |
| import edu.uci.ics.asterix.om.types.ARecordType; |
| import edu.uci.ics.asterix.om.types.IAType; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalExpressionTag; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.ConstantExpression; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider; |
| |
| public class RecordConstructorResultType implements IResultTypeComputer { |
| |
| private boolean isOpen; |
| |
| public static final RecordConstructorResultType CLOSED_INSTANCE = new RecordConstructorResultType(false); |
| public static final RecordConstructorResultType OPEN_INSTANCE = new RecordConstructorResultType(true); |
| |
| private RecordConstructorResultType(boolean open) { |
| this.isOpen = open; |
| } |
| |
| @Override |
| public IAType computeType(ILogicalExpression expression, IVariableTypeEnvironment env, |
| IMetadataProvider<?, ?> metadataProvider) throws AlgebricksException { |
| AbstractFunctionCallExpression f = (AbstractFunctionCallExpression) expression; |
| int n = f.getArguments().size() / 2; |
| String[] fieldNames = new String[n]; |
| IAType[] fieldTypes = new IAType[n]; |
| int i = 0; |
| Iterator<Mutable<ILogicalExpression>> argIter = f.getArguments().iterator(); |
| while (argIter.hasNext()) { |
| ILogicalExpression e1 = argIter.next().getValue(); |
| if (e1.getExpressionTag() == LogicalExpressionTag.CONSTANT) { |
| ConstantExpression nameExpr = (ConstantExpression) e1; |
| if (!(nameExpr.getValue() instanceof AsterixConstantValue)) { |
| throw new AlgebricksException("Expecting a string and found " + nameExpr.getValue() + " instead."); |
| } |
| fieldNames[i] = ((AString) ((AsterixConstantValue) nameExpr.getValue()).getObject()).getStringValue(); |
| } |
| ILogicalExpression e2 = argIter.next().getValue(); |
| try { |
| fieldTypes[i] = (IAType) env.getType(e2); |
| } catch (AlgebricksException e) { |
| throw new AlgebricksException(e); |
| } |
| i++; |
| } |
| return new ARecordType(null, fieldNames, fieldTypes, isOpen); |
| } |
| } |