| package edu.uci.ics.hyracks.dataflow.std.join; |
| |
| import edu.uci.ics.hyracks.api.comm.IFrameTupleAccessor; |
| import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator; |
| import edu.uci.ics.hyracks.api.dataflow.value.ITuplePairComparator; |
| |
| class JoinComparator implements ITuplePairComparator { |
| private final IBinaryComparator bComparator; |
| private final int field0; |
| private final int field1; |
| |
| public JoinComparator(IBinaryComparator bComparator, int field0, int field1) { |
| this.bComparator = bComparator; |
| this.field0 = field0; |
| this.field1 = field1; |
| } |
| |
| @Override |
| public int compare(IFrameTupleAccessor accessor0, int tIndex0, IFrameTupleAccessor accessor1, int tIndex1) { |
| int tStart0 = accessor0.getTupleStartOffset(tIndex0); |
| int fStartOffset0 = accessor0.getFieldSlotsLength() + tStart0; |
| |
| int tStart1 = accessor1.getTupleStartOffset(tIndex1); |
| int fStartOffset1 = accessor1.getFieldSlotsLength() + tStart1; |
| |
| int fStart0 = accessor0.getFieldStartOffset(tIndex0, field0); |
| int fEnd0 = accessor0.getFieldEndOffset(tIndex0, field0); |
| int fLen0 = fEnd0 - fStart0; |
| |
| int fStart1 = accessor1.getFieldStartOffset(tIndex1, field1); |
| int fEnd1 = accessor1.getFieldEndOffset(tIndex1, field1); |
| int fLen1 = fEnd1 - fStart1; |
| |
| int c = bComparator.compare(accessor0.getBuffer().array(), fStart0 + fStartOffset0, fLen0, accessor1 |
| .getBuffer().array(), fStart1 + fStartOffset1, fLen1); |
| if (c != 0) { |
| return c; |
| } |
| return 0; |
| } |
| } |