| package edu.uci.ics.asterix.om.typecomputer.impl; |
| |
| import edu.uci.ics.asterix.om.typecomputer.base.IResultTypeComputer; |
| import edu.uci.ics.asterix.om.types.ATypeTag; |
| import edu.uci.ics.asterix.om.types.AUnionType; |
| import edu.uci.ics.asterix.om.types.IAType; |
| import edu.uci.ics.asterix.om.util.NonTaggedFormatUtil; |
| 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.expressions.AbstractFunctionCallExpression; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider; |
| |
| public class NonTaggedSwitchCaseComputer implements IResultTypeComputer { |
| |
| private static final String errMsg1 = "switch case should have at least 3 parameters "; |
| private static final String errMsg2 = "every case expression should have the same return type"; |
| private static final String errMsg3 = "swith conditon type should be compatible with each case type"; |
| |
| public static IResultTypeComputer INSTANCE = new NonTaggedSwitchCaseComputer(); |
| |
| @Override |
| public IAType computeType(ILogicalExpression expression, IVariableTypeEnvironment env, |
| IMetadataProvider<?, ?> metadataProvider) throws AlgebricksException { |
| AbstractFunctionCallExpression fce = (AbstractFunctionCallExpression) expression; |
| if (fce.getArguments().size() < 3) |
| throw new AlgebricksException(errMsg1); |
| |
| IAType t0; |
| IAType t1; |
| IAType ti; |
| |
| ATypeTag tag0; |
| ATypeTag tag1; |
| ATypeTag tagi; |
| try { |
| t0 = (IAType) env.getType(fce.getArguments().get(0).getValue()); |
| t1 = (IAType) env.getType(fce.getArguments().get(2).getValue()); |
| tag0 = t0.getTypeTag(); |
| tag1 = t1.getTypeTag(); |
| if (t0.getTypeTag() == ATypeTag.UNION && NonTaggedFormatUtil.isOptionalField((AUnionType) t0)) |
| tag0 = ((AUnionType) t0).getUnionList().get(NonTaggedFormatUtil.OPTIONAL_TYPE_INDEX_IN_UNION_LIST) |
| .getTypeTag(); |
| if (t1.getTypeTag() == ATypeTag.UNION && NonTaggedFormatUtil.isOptionalField((AUnionType) t1)) |
| tag1 = ((AUnionType) t1).getUnionList().get(NonTaggedFormatUtil.OPTIONAL_TYPE_INDEX_IN_UNION_LIST) |
| .getTypeTag(); |
| for (int i = 2; i < fce.getArguments().size(); i += 2) { |
| ti = (IAType) env.getType(fce.getArguments().get(i).getValue()); |
| tagi = ti.getTypeTag(); |
| if (ti.getTypeTag() == ATypeTag.UNION && NonTaggedFormatUtil.isOptionalField((AUnionType) ti)) |
| tagi = ((AUnionType) ti).getUnionList().get(NonTaggedFormatUtil.OPTIONAL_TYPE_INDEX_IN_UNION_LIST) |
| .getTypeTag(); |
| if (tag1 != tagi) |
| if (!t1.toString().equals(ti.toString())) |
| throw new AlgebricksException(errMsg2); |
| } |
| for (int i = 1; i < fce.getArguments().size(); i += 2) { |
| ti = (IAType) env.getType(fce.getArguments().get(i).getValue()); |
| tagi = ti.getTypeTag(); |
| if (ti.getTypeTag() == ATypeTag.UNION && NonTaggedFormatUtil.isOptionalField((AUnionType) ti)) |
| tagi = ((AUnionType) ti).getUnionList().get(NonTaggedFormatUtil.OPTIONAL_TYPE_INDEX_IN_UNION_LIST) |
| .getTypeTag(); |
| if (tag0 != tagi) |
| throw new AlgebricksException(errMsg3); |
| } |
| } catch (AlgebricksException e) { |
| throw new AlgebricksException(e); |
| } |
| return t1; |
| } |
| } |