/**
* Licensed to Odiago, Inc. under one or more contributor license
* agreements. See the NOTICE.txt file distributed with this work for
* additional information regarding copyright ownership. Odiago, Inc.
* 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 com.odiago.flumebase.exec.builtins;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.List;
import org.apache.avro.util.Utf8;
import com.odiago.flumebase.exec.EventWrapper;
import com.odiago.flumebase.lang.ScalarFunc;
import com.odiago.flumebase.lang.Type;
/**
* Return the STRING representation of a BINARY object.
*/
public class bin2str extends ScalarFunc {
/** Charset used to decode all ByteBuffers */
private static Charset UTF8_CHARSET;
static {
UTF8_CHARSET = Charset.forName("UTF-8");
}
@Override
public Type getReturnType() {
return Type.getNullable(Type.TypeName.STRING);
}
@Override
public Object eval(EventWrapper event, Object... args) {
Object arg0 = args[0];
if (null == arg0) {
return null;
} else {
ByteBuffer bytes = (ByteBuffer) arg0;
return new Utf8(new String(bytes.array(), bytes.position(), bytes.remaining(),
UTF8_CHARSET));
}
}
@Override
public List<Type> getArgumentTypes() {
return Collections.singletonList(Type.getNullable(Type.TypeName.BINARY));
}
}