org.kitesdk.morphline.base.Validator Maven / Gradle / Ivy
/*
* Copyright 2013 Cloudera Inc.
*
* Licensed 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.kitesdk.morphline.base;
import java.util.Arrays;
import org.kitesdk.morphline.api.MorphlineCompilationException;
import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.typesafe.config.Config;
/**
* Simple helper to validate user configurable parameters.
*/
public final class Validator {
/**
* Validates that the given value is contained in the range [min, max]
*/
public void validateRange(Config config, T value, Comparable min, Comparable max) {
boolean isValid = min.compareTo(value) <= 0 && 0 <= max.compareTo(value);
if (!isValid) {
throw new MorphlineCompilationException(
String.format("Invalid choice: '%s' (choose from {%s..%s})",
value,
min,
max),
config);
}
}
/**
* Validates that an enum of the given type with the given value exists, and that this enum is
* contained in the given list of permitted choices; finally returns that enum object.
*/
public > T validateEnum(Config config, String value, Class type, T... choices) {
if (choices.length == 0) {
choices = type.getEnumConstants();
}
Preconditions.checkArgument(choices.length > 0);
try {
T result = Enum.valueOf(type, value);
if (!Arrays.asList(choices).contains(result)) {
throw new IllegalArgumentException();
}
return result;
} catch (IllegalArgumentException e) {
throw new MorphlineCompilationException(
String.format("Invalid choice: '%s' (choose from {%s})",
value,
Joiner.on(",").join(choices)),
config);
}
}
// public T validateChoice(Config config, String value, T... choices) {
// Preconditions.checkArgument(choices.length > 0);
// int i = Arrays.asList(choices).indexOf(value);
// if (i >= 0) {
// return choices[i];
// }
// fail(config, String.format("Invalid choice: '%s' (choose from {%s})", value, Joiner.on(",").join(choices)));
// return null; // keep compiler happy
// }
}