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/**
 * 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.lens.cube.parse;

import java.util.Iterator;
import java.util.Set;

import org.apache.lens.cube.metadata.FactPartition;

/**
 * Writes timerange partitions as an OR expression.
 */
public class ORTimeRangeWriter implements TimeRangeWriter {

  @Override
  public String getTimeRangeWhereClause(CubeQueryContext cubeQueryContext, String tableName,
    Set rangeParts) {
    if (rangeParts.size() == 0) {
      return "";
    }
    StringBuilder partStr = new StringBuilder();
    Iterator it = rangeParts.iterator();
    while (it.hasNext()) {
      FactPartition factPartition = it.next();
      partStr.append("(");

      String partFilter = TimeRangeUtils.getTimeRangePartitionFilter(factPartition, cubeQueryContext, tableName);
      partStr.append(partFilter);
      partStr.append(")");
      if (it.hasNext()) {
        partStr.append(" OR ");
      }
    }
    return partStr.toString();
  }
}