| 1 | /* |
| 2 | * Copyright 2006-2007 the original author or authors. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.springframework.batch.item.file.transform; |
| 18 | |
| 19 | import java.util.ArrayList; |
| 20 | import java.util.List; |
| 21 | |
| 22 | /** |
| 23 | * Tokenizer used to process data obtained from files with fixed-length format. |
| 24 | * Columns are specified by array of Range objects ({@link #setColumns(Range[])}). |
| 25 | * |
| 26 | * @author tomas.slanina |
| 27 | * @author peter.zozom |
| 28 | * @author Dave Syer |
| 29 | */ |
| 30 | public class FixedLengthTokenizer extends AbstractLineTokenizer { |
| 31 | |
| 32 | private Range[] ranges; |
| 33 | |
| 34 | /** |
| 35 | * Set the column ranges. Used in conjunction with the |
| 36 | * {@link RangeArrayPropertyEditor} this property can be set in the form of |
| 37 | * a String describing the range boundaries, e.g. "1,4,7" or "1-3,4-6,7" or |
| 38 | * "1-2,4-5,7-10". |
| 39 | * |
| 40 | * @param ranges the column ranges expected in the input |
| 41 | */ |
| 42 | public void setColumns(Range[] ranges) { |
| 43 | this.ranges = ranges; |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * Yields the tokens resulting from the splitting of the supplied |
| 48 | * <code>line</code>. |
| 49 | * |
| 50 | * @param line |
| 51 | * the line to be tokenised (can be <code>null</code>) |
| 52 | * |
| 53 | * @return the resulting tokens (empty if the line is null) |
| 54 | */ |
| 55 | protected List doTokenize(String line) { |
| 56 | List tokens = new ArrayList(ranges.length); |
| 57 | int lineLength; |
| 58 | String token; |
| 59 | |
| 60 | lineLength = line.length(); |
| 61 | |
| 62 | for (int i = 0; i < ranges.length; i++) { |
| 63 | |
| 64 | int startPos = ranges[i].getMin() - 1; |
| 65 | int endPos = ranges[i].getMax(); |
| 66 | |
| 67 | if (lineLength >= endPos) { |
| 68 | token = line.substring(startPos, endPos); |
| 69 | } else if (lineLength >= startPos) { |
| 70 | token = line.substring(startPos); |
| 71 | } else { |
| 72 | token = ""; |
| 73 | } |
| 74 | |
| 75 | tokens.add(token); |
| 76 | } |
| 77 | |
| 78 | return tokens; |
| 79 | } |
| 80 | } |