| /* |
| * Copyright (C) 2011 The Android Open Source Project |
| * |
| * 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 com.android.tradefed.util; |
| |
| import java.io.PrintWriter; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Helper class to display a matrix of String elements so each element column is lined up |
| */ |
| public class TableFormatter { |
| |
| private int mColumnSpacing = 2; |
| |
| /** |
| * Sets the number of whitespace characters between each column. |
| * |
| * @param spacing the number of whitespace characters |
| * @return the {@link TableFormatter} |
| */ |
| public TableFormatter setColumnSpacing(int spacing) { |
| mColumnSpacing = spacing; |
| return this; |
| } |
| |
| /** |
| * Display given String elements as an table with aligned columns. |
| * |
| * @param table a matrix of String elements. Rows can be different length |
| * @param writer the {@link PrintWriter} to dump output to |
| */ |
| public void displayTable(List<List<String>> table, PrintWriter writer) { |
| if (table.size() <= 0) { |
| throw new IllegalArgumentException(); |
| } |
| // build index of max column sizes |
| List<Integer> maxColumnSizes = getColumnSizes(table); |
| for (List<String> rowData : table) { |
| for (int col = 0; col < rowData.size(); col++) { |
| writer.append(rowData.get(col)); |
| int numPaddingChars = maxColumnSizes.get(col) - rowData.get(col).length(); |
| insertPadding(numPaddingChars, writer); |
| } |
| writer.println(); |
| } |
| } |
| |
| private void insertPadding(int numChars, PrintWriter writer) { |
| for (int i = 0; i < numChars; i++) { |
| writer.append(' '); |
| } |
| } |
| |
| private List<Integer> getColumnSizes(List<List<String>> table) { |
| List<Integer> maxColumnSizes = new ArrayList<Integer>(); |
| for (List<String> rowData : table) { |
| for (int colIndex = 0; colIndex < rowData.size(); colIndex++) { |
| if (colIndex >= maxColumnSizes.size()) { |
| maxColumnSizes.add(colIndex, 0); |
| } |
| // add column spacing to string length so there is at least that amount of space |
| // between columns |
| int stringSize = rowData.get(colIndex).length() + mColumnSpacing; |
| if (maxColumnSizes.get(colIndex) < stringSize) { |
| maxColumnSizes.set(colIndex, stringSize); |
| } |
| } |
| } |
| |
| return maxColumnSizes; |
| } |
| } |