Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.kylin.storage.cache; import org.apache.kylin.common.util.DateFormat; import org.apache.kylin.metadata.filter.CompareTupleFilter; import org.apache.kylin.metadata.filter.LogicalTupleFilter; import org.apache.kylin.metadata.filter.TupleFilter; import org.apache.kylin.metadata.model.TblColRef; import com.google.common.collect.Range; /** */ public class TsConditionExtractor { /** * * @return null if the ts range conflicts with each other * Ranges.all() if no ts condition is defined(in surfaced ANDs) */ public static Range<Long> extractTsCondition(TblColRef tsColRef, TupleFilter rootFilter) { return extractTsConditionInternal(rootFilter, tsColRef); } private static Range<Long> extractTsConditionInternal(TupleFilter filter, TblColRef colRef) { if (filter == null) { return Range.all(); } if (filter instanceof LogicalTupleFilter) { if (filter.getOperator() == TupleFilter.FilterOperatorEnum.AND) { Range<Long> ret = Range.all(); for (TupleFilter child : filter.getChildren()) { Range childRange = extractTsConditionInternal(child, colRef); if (childRange != null) { if (ret.isConnected(childRange) && !ret.intersection(childRange).isEmpty()) { ret = ret.intersection(childRange); } else { return null; } } else { return null; } } return ret.isEmpty() ? null : ret; } else { //for conditions like date > DATE'2000-11-11' OR date < DATE '1999-01-01' //we will use Ranges.all() rather than two ranges to represent them return Range.all(); } } if (filter instanceof CompareTupleFilter) { CompareTupleFilter compareTupleFilter = (CompareTupleFilter) filter; if (compareTupleFilter.getColumn() == null)// column will be null at filters like " 1<>1" return Range.all(); if (compareTupleFilter.getColumn().equals(colRef)) { Object firstValue = compareTupleFilter.getFirstValue(); long t; switch (compareTupleFilter.getOperator()) { case EQ: t = DateFormat.stringToMillis((String) firstValue); return Range.closed(t, t); case LT: t = DateFormat.stringToMillis((String) firstValue); return Range.lessThan(t); case LTE: t = DateFormat.stringToMillis((String) firstValue); return Range.atMost(t); case GT: t = DateFormat.stringToMillis((String) firstValue); return Range.greaterThan(t); case GTE: t = DateFormat.stringToMillis((String) firstValue); return Range.atLeast(t); case NEQ: case IN://not handled for now break; default: } } } return Range.all(); } }