/**
* 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.exec.UDFArgumentTypeException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters.Converter;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector.PrimitiveCategory;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
public abstract class GenericUDFBasePad extends GenericUDF {
private transient Converter converter1;
private transient Converter converter2;
private transient Converter converter3;
private Text result = new Text();
private String udfName;
public GenericUDFBasePad(String _udfName) {
this.udfName = _udfName;
}
@Override
public ObjectInspector initialize(ObjectInspector[] arguments) throws UDFArgumentException {
if (arguments.length != 3) {
throw new UDFArgumentException(udfName + " requires three arguments. Found :"
+ arguments.length);
}
converter1 = checkArguments(arguments, 0);
converter2 = checkArguments(arguments, 1);
converter3 = checkArguments(arguments, 2);
return PrimitiveObjectInspectorFactory.writableStringObjectInspector;
}
@Override
public Object evaluate(DeferredObject[] arguments) throws HiveException {
Object valObject1 = arguments[0].get();
Object valObject2 = arguments[1].get();
Object valObject3 = arguments[2].get();
if (valObject1 == null || valObject2 == null || valObject3 == null) {
return null;
}
Text str = (Text) converter1.convert(valObject1);
IntWritable lenW = (IntWritable) converter2.convert(valObject2);
Text pad = (Text) converter3.convert(valObject3);
if (str == null || pad == null || lenW == null) {
return null;
}
int len = lenW.get();
byte[] data = result.getBytes();
if (data.length < len) {
data = new byte[len];
}
byte[] txt = str.getBytes();
byte[] padTxt = pad.getBytes();
performOp(data, txt, padTxt, len, str, pad);
result.set(data, 0, len);
return result;
}
@Override
public String getDisplayString(String[] children) {
return udfName + "(" + StringUtils.join(children, ", ") + ")";
}
protected abstract void performOp(byte[] data, byte[] txt, byte[] padTxt, int len, Text str,
Text pad);
private Converter checkArguments(ObjectInspector[] arguments, int i)
throws UDFArgumentException {
if (arguments[i].getCategory() != ObjectInspector.Category.PRIMITIVE) {
throw new UDFArgumentTypeException(i + 1, "Only primitive type arguments are accepted but "
+ arguments[i].getTypeName() + " is passed. as arguments");
}
PrimitiveCategory inputType = ((PrimitiveObjectInspector) arguments[i]).getPrimitiveCategory();
Converter converter;
switch (inputType) {
case STRING:
case CHAR:
case VARCHAR:
converter = ObjectInspectorConverters.getConverter((PrimitiveObjectInspector) arguments[i],
PrimitiveObjectInspectorFactory.writableStringObjectInspector);
break;
case INT:
case SHORT:
case BYTE:
converter = ObjectInspectorConverters.getConverter((PrimitiveObjectInspector) arguments[i],
PrimitiveObjectInspectorFactory.writableIntObjectInspector);
break;
default:
throw new UDFArgumentTypeException(i + 1, udfName
+ " only takes STRING/CHAR/INT/SHORT/BYTE/VARCHAR types as " + (i + 1) + "-ths argument, got "
+ inputType);
}
return converter;
}
}