/**
* Copyright 2013 Cloudera Inc.
*
* Licensed 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 com.cloudera.cdk.data.hbase.filters;
import com.cloudera.cdk.data.DatasetException;
import com.cloudera.cdk.data.hbase.impl.EntitySchema;
import com.cloudera.cdk.data.hbase.impl.EntitySchema.FieldMapping;
import com.cloudera.cdk.data.hbase.impl.EntitySerDe;
import com.cloudera.cdk.data.hbase.impl.MappingType;
import org.apache.hadoop.hbase.filter.CompareFilter;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.filter.SingleColumnValueFilter;
/**
* An EntityFilter that will perform an equality filter on a single entity
* field.
*/
public class SingleFieldEntityFilter implements EntityFilter {
private final org.apache.hadoop.hbase.filter.Filter filter;
public SingleFieldEntityFilter(EntitySchema entitySchema,
EntitySerDe<?> entitySerDe, String fieldName, Object filterValue) {
this(entitySchema, entitySerDe, fieldName, filterValue,
CompareFilter.CompareOp.EQUAL);
}
public SingleFieldEntityFilter(EntitySchema entitySchema,
EntitySerDe<?> entitySerDe, String fieldName, Object filterValue,
CompareFilter.CompareOp equalityOperator) {
FieldMapping fieldMapping = entitySchema.getFieldMapping(fieldName);
if (fieldMapping.getMappingType() != MappingType.COLUMN) {
throw new DatasetException(
"SingleColumnValueFilter only compatible with COLUMN mapping types.");
}
byte[] family = fieldMapping.getFamily();
byte[] qualifier = fieldMapping.getQualifier();
byte[] comparisonBytes = entitySerDe.serializeColumnValueToBytes(fieldName,
filterValue);
this.filter = new SingleColumnValueFilter(family, qualifier,
equalityOperator, comparisonBytes);
}
public Filter getFilter() {
return filter;
}
}