| /** |
| * 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.hadoop.mrunit.internal.util; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.mrunit.types.Pair; |
| |
| public class StringUtils { |
| |
| /** |
| * Split "key \t val" into Pair(Text(key), Text(val)) |
| * |
| * @param tabSeparatedPair |
| * @return |
| */ |
| public static Pair<Text, Text> parseTabbedPair(final String tabSeparatedPair) { |
| final int split = tabSeparatedPair.indexOf('\t'); |
| if (split == -1) { |
| throw new IllegalArgumentException("String pair missing a tab separator"); |
| } |
| return new Pair<Text, Text>(new Text(tabSeparatedPair.substring(0, split)), |
| new Text(tabSeparatedPair.substring(split + 1))); |
| } |
| |
| /** |
| * Split "val,val,val,val..." into a List of Text(val) objects. |
| * |
| * @param commaDelimList |
| * A list of values separated by commas |
| */ |
| public static List<Text> parseCommaDelimitedList( |
| final String commaDelimList) { |
| final ArrayList<Text> outList = new ArrayList<Text>(); |
| |
| final int len = commaDelimList.length(); |
| int curPos = 0; |
| int curComma = commaDelimList.indexOf(','); |
| if (curComma == -1) { |
| curComma = len; |
| } |
| |
| while (curPos < len) { |
| outList.add(new Text(commaDelimList.substring(curPos, curComma).trim())); |
| curPos = curComma + 1; |
| curComma = commaDelimList.indexOf(',', curPos); |
| if (curComma == -1) { |
| curComma = len; |
| } |
| } |
| |
| return outList; |
| } |
| |
| /** |
| * Transform a list with elements a and b into a string "(a,b)". |
| */ |
| public static void formatValueList(final List<?> values, |
| final StringBuilder sb) { |
| sb.append("("); |
| |
| boolean first = true; |
| for (final Object val : values) { |
| if (!first) { |
| sb.append(", "); |
| } |
| first = false; |
| sb.append(val); |
| } |
| |
| sb.append(")"); |
| } |
| |
| /** |
| * Transform a list with elements (a1,a2) and (b1,b2) into a string "[(a1,a2),(b1,b2)]". |
| */ |
| public static <K, V> void formatPairList(final List<Pair<K, V>> pairs, |
| final StringBuilder sb) { |
| sb.append("["); |
| |
| boolean first = true; |
| for (final Pair<K, V> p : pairs) { |
| if (!first) { |
| sb.append(", "); |
| } |
| first = false; |
| sb.append("(" + p.getFirst() + ", " + p.getSecond() + ")"); |
| } |
| |
| sb.append("]"); |
| } |
| } |