/*
* 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.nifi.processors.hadoop;
import org.apache.nifi.components.ValidationContext;
import org.apache.nifi.components.ValidationResult;
import org.apache.nifi.components.Validator;
import java.io.File;
/**
* Validators for Hadoop related processors.
*/
public interface HadoopValidators {
/*
* Validates that one or more files exist, as specified in a single property.
*/
Validator ONE_OR_MORE_FILE_EXISTS_VALIDATOR = new Validator() {
@Override
public ValidationResult validate(String subject, String input, ValidationContext context) {
final String[] files = input.split(",");
for (String filename : files) {
try {
final File file = new File(filename.trim());
final boolean valid = file.exists() && file.isFile();
if (!valid) {
final String message = "File " + file + " does not exist or is not a file";
return new ValidationResult.Builder().subject(subject).input(input).valid(false).explanation(message).build();
}
} catch (SecurityException e) {
final String message = "Unable to access " + filename + " due to " + e.getMessage();
return new ValidationResult.Builder().subject(subject).input(input).valid(false).explanation(message).build();
}
}
return new ValidationResult.Builder().subject(subject).input(input).valid(true).build();
}
};
/*
* Validates that a property is a valid umask, i.e. a short octal number that is not negative.
*/
Validator UMASK_VALIDATOR = new Validator() {
@Override
public ValidationResult validate(final String subject, final String value, final ValidationContext context) {
String reason = null;
try {
final short shortVal = Short.parseShort(value, 8);
if (shortVal < 0) {
reason = "octal umask [" + value + "] cannot be negative";
} else if (shortVal > 511) {
// HDFS umask has 9 bits: rwxrwxrwx ; the sticky bit cannot be umasked
reason = "octal umask [" + value + "] is not a valid umask";
}
} catch (final NumberFormatException e) {
reason = "[" + value + "] is not a valid short octal number";
}
return new ValidationResult.Builder().subject(subject).input(value).explanation(reason).valid(reason == null)
.build();
}
};
/*
* Validates that a property is a valid short number greater than 0.
*/
Validator POSITIVE_SHORT_VALIDATOR = new Validator() {
@Override
public ValidationResult validate(final String subject, final String value, final ValidationContext context) {
String reason = null;
try {
final short shortVal = Short.parseShort(value);
if (shortVal <= 0) {
reason = "short integer must be greater than zero";
}
} catch (final NumberFormatException e) {
reason = "[" + value + "] is not a valid short integer";
}
return new ValidationResult.Builder().subject(subject).input(value).explanation(reason).valid(reason == null)
.build();
}
};
}