package com.thinkbiganalytics.policy.validation;
/*-
* #%L
* thinkbig-field-policy-default
* %%
* Copyright (C) 2017 ThinkBig Analytics
* %%
* 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.
* #L%
*/
import com.thinkbiganalytics.policy.PolicyProperty;
import com.thinkbiganalytics.policy.PolicyPropertyRef;
import com.thinkbiganalytics.policy.PolicyPropertyTypes;
import com.thinkbiganalytics.policy.PropertyLabelValue;
import org.apache.commons.lang3.StringUtils;
import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Validates the value is a given timestamp
*/
@Validator(name = "Timestamp", description = "Validate Hive-friendly timstamp format")
public class TimestampValidator implements ValidationPolicy<String> {
private static final DateTimeFormatter DATETIME_NANOS = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss.SSSSSSSSS");
private static final DateTimeFormatter DATETIME_MILLIS = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss.SSS");
private static final DateTimeFormatter DATETIME_NOMILLIS = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss");
private static final DateTimeFormatter DATETIME_ISO8601 = ISODateTimeFormat.dateTimeParser();
private static final int MIN_LENGTH = 19;
private static final int MAX_LENGTH = 29;
private static Logger log = LoggerFactory.getLogger(TimestampValidator.class);
@PolicyProperty(name = "allowNull", value = "false", displayName = "Allow Null Values",
hint = "Null values are considered to be valid", type = PolicyPropertyTypes.PROPERTY_TYPE.select,
labelValues = {@PropertyLabelValue(label = "Yes", value = "true"),
@PropertyLabelValue(label = "No", value = "false")})
private boolean allowNull = false;
public TimestampValidator(@PolicyPropertyRef(name = "allowNull") boolean allowNull) {
super();
this.allowNull = allowNull;
}
public TimestampValidator() {
super();
}
@Override
public boolean validate(String value) {
if (!StringUtils.isEmpty(value)) {
try {
parseTimestamp(value);
return true;
} catch (IllegalArgumentException e) {
log.debug("Invalid timestamp format [{}]", value);
return false;
}
} else {
return allowNull;
}
}
/**
* Parses the string date and returns the
* Sqoop treats null values as \N.
*/
public DateTime parseTimestamp(String value) {
// Check if the value is consider a null
if ((allowNull) && (value.toUpperCase().equals("NULL"))) {
return new DateTime();
}
int cnt = value.length();
if (cnt < MIN_LENGTH || cnt > MAX_LENGTH) {
throw new IllegalArgumentException("Unexpected format");
}
if (value.charAt(10) == 'T') {
return DATETIME_ISO8601.parseDateTime(value);
} else if (cnt == MIN_LENGTH) {
return DATETIME_NOMILLIS.parseDateTime(value);
} else if (cnt == MAX_LENGTH) {
return DATETIME_NANOS.parseDateTime(value);
} else {
return DATETIME_MILLIS.parseDateTime(value);
}
}
public boolean getAllowNull() {
return allowNull;
}
public boolean isAllowNull() {
return allowNull;
}
public void setAllowNull(boolean allowNull) {
this.allowNull = allowNull;
}
}