/**
* 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.hadoop.hive.ql.udf.generic;
import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorConverter.TextConverter;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.io.Text;
public abstract class GenericUDFBaseTrim extends GenericUDF {
private transient TextConverter converter;
private Text result = new Text();
private String udfName;
public GenericUDFBaseTrim(String _udfName) {
this.udfName = _udfName;
}
@Override
public ObjectInspector initialize(ObjectInspector[] arguments) throws UDFArgumentException {
if (arguments.length != 1) {
throw new UDFArgumentException(udfName + " requires one value argument. Found :"
+ arguments.length);
}
PrimitiveObjectInspector argumentOI;
if(arguments[0] instanceof PrimitiveObjectInspector) {
argumentOI = (PrimitiveObjectInspector) arguments[0];
} else {
throw new UDFArgumentException(udfName + " takes only primitive types. found "
+ arguments[0].getTypeName());
}
switch (argumentOI.getPrimitiveCategory()) {
case STRING:
case CHAR:
case VARCHAR:
break;
default:
throw new UDFArgumentException(udfName + " takes only STRING/CHAR/VARCHAR types. Found "
+ argumentOI.getPrimitiveCategory());
}
converter = new TextConverter(argumentOI);
return PrimitiveObjectInspectorFactory.writableStringObjectInspector;
}
@Override
public Object evaluate(DeferredObject[] arguments) throws HiveException {
Object valObject = arguments[0].get();
if (valObject == null) {
return null;
}
String val = ((Text) converter.convert(valObject)).toString();
if (val == null) {
return null;
}
result.set(performOp(val.toString()));
return result;
}
@Override
public String getDisplayString(String[] children) {
return udfName + "(" + StringUtils.join(children, ", ") + ")";
}
protected abstract String performOp(String val);
}