io.druid.java.util.common.parsers.ParserUtils Maven / Gradle / Ivy
/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.java.util.common.parsers;
import com.google.common.base.Function;
import com.google.common.collect.Sets;
import org.joda.time.DateTime;
import java.util.ArrayList;
import java.util.Set;
public class ParserUtils
{
public static final Function nullEmptyStringFunction = new Function()
{
@Override
public String apply(String input)
{
if (input == null || input.isEmpty()) {
return null;
}
return input;
}
};
public static ArrayList generateFieldNames(int length)
{
ArrayList names = new ArrayList<>(length);
for (int i = 0; i < length; ++i) {
names.add("column_" + (i + 1));
}
return names;
}
/**
* Factored timestamp parsing into its own Parser class, but leaving this here
* for compatibility
*
* @param format
*
* @return
*/
public static Function createTimestampParser(final String format)
{
return TimestampParser.createTimestampParser(format);
}
public static Set findDuplicates(Iterable fieldNames)
{
Set duplicates = Sets.newHashSet();
Set uniqueNames = Sets.newHashSet();
for (String fieldName : fieldNames) {
String next = fieldName.toLowerCase();
if (uniqueNames.contains(next)) {
duplicates.add(next);
}
uniqueNames.add(next);
}
return duplicates;
}
public static void validateFields(Iterable fieldNames)
{
Set duplicates = findDuplicates(fieldNames);
if (!duplicates.isEmpty()) {
throw new ParseException("Duplicate column entries found : %s", duplicates.toString());
}
}
public static String stripQuotes(String input)
{
input = input.trim();
if (input.charAt(0) == '\"' && input.charAt(input.length() - 1) == '\"') {
input = input.substring(1, input.length() - 1).trim();
}
return input;
}
}