/**
* 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.xml;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.io.Text;
@Description(name = "xpath_string",
value = "_FUNC_(xml, xpath) - Returns the text contents of the first xml node that matches the xpath expression",
extended = "Example:\n"
+ " > SELECT _FUNC_('<a><b>b</b><c>cc</c></a>','a/c') FROM src LIMIT 1;\n"
+ " 'cc'\n"
+ " > SELECT _FUNC_('<a><b>b1</b><b>b2</b></a>','a/b') FROM src LIMIT 1;\n"
+ " 'b1'\n"
+ " > SELECT _FUNC_('<a><b>b1</b><b>b2</b></a>','a/b[2]') FROM src LIMIT 1;\n"
+ " 'b2'\n"
+ " > SELECT _FUNC_('<a><b>b1</b><b>b2</b></a>','a') FROM src LIMIT 1;\n"
+ " 'b1b2'"
)
public class UDFXPathString extends UDF {
private final UDFXPathUtil xpath = new UDFXPathUtil();
private final Text result = new Text();
public Text evaluate(String xml, String path) {
String s = xpath.evalString(xml, path);
if (s == null) {
return null;
}
result.set(s);
return result;
}
}