();
+ for (int i = 0; i < len; i++) {
+ Object o = objects[i];
+ String value = o == null ? "null" : o.toString();
+ datas.add(value);
+
+ // 获取第 i 列的最大长度值，如果当前列的长度大于了以前的最大列，就覆盖最大列长度为当前的列长度.
+ Integer maxColSize = this.maxColMap.get(i);
+ if (maxColSize == null) {
+ this.maxColMap.put(i, value.length());
+ continue;
+ }
+
+ if (value.length() > maxColSize) {
+ this.maxColMap.put(i, value.length());
+ }
+ }
+ this.rows.add(new Row(rowType, datas));
+ }
+ return this;
+ }
+
+ /**
+ * 构建表格标题所在行的字符串.
+ *
+ * 这里重点需要计算出标题所占用的最大字符串长度，然后截取出标题的字符串.
+ * 计算标题字符串最大长度的公式: `maxTitleSize = n * (maxColSize) + (n - 1) * 3`;
+ *
+ */
+ private void buildTitle() {
+ if (this.title != null) {
+ // 计算出标题字符串最大长度.
+ int maxTitleSize = 0;
+ for (Integer maxColSize : this.maxColMap.values()) {
+ maxTitleSize += maxColSize;
+ }
+ maxTitleSize += 3 * (this.maxColMap.size() - 1);
+
+ // 如果最大的标题字符串长度大于了现有的标题，就对现有的标题进行截取.
+ if (this.title.length() > maxTitleSize) {
+ this.title = this.title.substring(0, maxTitleSize);
+ }
+
+ // 拼接出标题行的上边框和标题行的数据.
+ this.join.append("+");
+ for (int i = 0; i < maxTitleSize + 2; i++) {
+ this.join.append("-");
+ }
+ this.join.append("+\n")
+ .append("|")
+ .append(StrUtils.center(this.title, maxTitleSize + 2, ' '))
+ .append("|\n");
+
+ this.lastRowType = RowType.TITLE;
+ }
+ }
+
+ /**
+ * 构建生成表格 table，先构建出标题，然后遍历每行数据进行构建.
+ */
+ private void buildTable() {
+ this.buildTitle();
+
+ // 遍历每行的数据，生成表格的行数据.
+ for (int i = 0, len = this.rows.size(); i < len; i++) {
+ List datas = this.rows.get(i).datas;
+ switch (this.rows.get(i).rowType) {
+ // 如果当前行是表头，则需要考虑生成上下边框.
+ case HEADER:
+ if (this.lastRowType != RowType.HEADER) {
+ this.buildRowBorder(datas);
+ }
+ this.buildRowData(datas);
+ this.buildRowBorder(datas);
+ break;
+ // 如果当前行是普通数据行，则需要考虑在最后一行处追加下边框.
+ case DATA:
+ this.buildRowData(datas);
+ if (i == len - 1) {
+ this.buildRowBorder(datas);
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ }
+
+ /**
+ * 构建边框行的方法.
+ *
+ * @param datas 行
+ */
+ private void buildRowBorder(List datas) {
+ this.join.append("+");
+ for (int i = 0, len = datas.size(); i < len; i++) {
+ for (int j = 0; j < this.maxColMap.get(i) + 2; j++) {
+ this.join.append("-");
+ }
+ this.join.append("+");
+ }
+ this.join.append("\n");
+ }
+
+ /**
+ * 构建数据行的方法.
+ *
+ * @param datas 行数据
+ */
+ private void buildRowData(List datas) {
+ this.join.append("|");
+ for (int i = 0, len = datas.size(); i < len; i++) {
+ this.join.append(StrUtils.center(datas.get(i), this.maxColMap.get(i) + 2, ' '))
+ .append("|");
+ }
+ this.join.append("\n");
+ }
+
+ /**
+ * 渲染出生成的结果.
+ *
+ * @return Table的ASCII字符串
+ */
+ public String render() {
+ this.buildTable();
+ return this.join.toString();
+ }
+
+ /**
+ * 表格每行的类型和数据的实体类.
+ */
+ private static class Row {
+
+ /** 行类型. */
+ private RowType rowType;
+
+ /** 行数据. */
+ private List datas;
+
+ /**
+ * 构造方法.
+ *
+ * @param rowType 行类型
+ * @param datas 行数据集
+ */
+ Row(RowType rowType, List datas) {
+ this.rowType = rowType;
+ this.datas = datas;
+ }
+
+ }
+
+ /**
+ * 区分是表头还是普通表格数据的枚举类.
+ */
+ private enum RowType {
+ TITLE, HEADER, DATA
+ }
+
+ /**
+ * 字符串工具类.
+ */
+ private static final class StrUtils {
+
+ /**
+ * 将某字符串置于给定大小的中间.
+ *
+ * @param str 字符串
+ * @param size 总大小
+ * @param padChar 填充字符
+ * @return 字符串结果
+ */
+ private static String center(String str, int size, char padChar) {
+ if (str != null && size > 0) {
+ int strLen = str.length();
+ int pads = size - strLen;
+ if (pads > 0) {
+ str = leftPad(str, strLen + pads / 2, padChar);
+ str = rightPad(str, size, padChar);
+ }
+ }
+ return str;
+ }
+
+ /**
+ * 对给定的字符串和大小进行左填充.
+ *
+ * @param str 字符串
+ * @param size 填充的总大小
+ * @param padChar 填充字符
+ * @return 填充结果
+ */
+ private static String leftPad(final String str, int size, char padChar) {
+ int pads = size - str.length();
+ return pads <= 0 ? str : repeat(padChar, pads).concat(str);
+ }
+
+ /**
+ * 对给定的字符串和大小进行右填充.
+ *
+ * @param str 字符串
+ * @param size 填充的总大小
+ * @param padChar 填充字符
+ * @return 填充结果
+ */
+ private static String rightPad(final String str, int size, char padChar) {
+ int pads = size - str.length();
+ return pads <= 0 ? str : str.concat(repeat(padChar, pads));
+ }
+
+ /**
+ * 重复填充字符为字符串.
+ *
+ * @param ch 字符
+ * @param repeat 重复次数
+ * @return 字符串
+ */
+ private static String repeat(char ch, int repeat) {
+ char[] buf = new char[repeat];
+ for (int i = repeat - 1; i >= 0; i--) {
+ buf[i] = ch;
+ }
+ return new String(buf);
+ }
+
+ }
+
+}
diff --git a/src/test/java/com/blinkfox/minitable/MiniTableTest.java b/src/test/java/com/blinkfox/minitable/MiniTableTest.java
new file mode 100644
index 0000000..c7f0e0b
--- /dev/null
+++ b/src/test/java/com/blinkfox/minitable/MiniTableTest.java
@@ -0,0 +1,72 @@
+package com.blinkfox.minitable;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * MiniTableTest.
+ *
+ * @author blinkfox on 2019-01-13.
+ */
+public class MiniTableTest {
+
+ private static final String TABLE = ""
+ + "+-------------------------------------------------------------+\n"
+ + "| The Title |\n"
+ + "+-----------+--------+-----+--------------------+-------------+\n"
+ + "| Name | Sex | Age | Email | Phone |\n"
+ + "+-----------+--------+-----+--------------------+-------------+\n"
+ + "| LiLei | male | 25 | lilei@gmail.com | 13809345219 |\n"
+ + "| hanMeiMei | female | 23 | hmm@163.com | 13515343853 |\n"
+ + "+-----------+--------+-----+--------------------+-------------+\n"
+ + "| Name | Sex | Age | Email | Phone |\n"
+ + "+-----------+--------+-----+--------------------+-------------+\n"
+ + "| ZhangSan | female | 32 | zhangsan@gmail.com | 13920199836 |\n"
+ + "| Lisi | male | 28 | lisi@qq.com | 13635781534 |\n"
+ + "| WangWu | male | 48 | wangwu@163.com | 15809876236 |\n"
+ + "+-----------+--------+-----+--------------------+-------------+\n";
+
+ /**
+ * 测试正常渲染的情况.
+ */
+ @Test
+ public void render() {
+ String table = new MiniTable("The Title")
+ .addHeaders("Name", "Sex", "Age", "Email", "Phone")
+ .addDatas("LiLei", "male", 25, "lilei@gmail.com", "13809345219")
+ .addDatas("hanMeiMei", "female", 23, "hmm@163.com", "13515343853")
+ .addHeaders("Name", "Sex", "Age", "Email", "Phone")
+ .addDatas("ZhangSan", "female", 32, "zhangsan@gmail.com", "13920199836")
+ .addDatas("Lisi", "male", 28, "lisi@qq.com", "13635781534")
+ .addDatas("WangWu", "male", 48, "wangwu@163.com", "15809876236")
+ .render();
+ Assert.assertEquals(TABLE, table);
+ }
+
+ /**
+ * 测试参数不对时的情况.
+ */
+ @Test(expected = IllegalArgumentException.class)
+ public void renderWithException() {
+ new MiniTable().addHeaders("col11", "col12")
+ .addDatas("col21")
+ .render();
+ }
+
+ /**
+ * 测试参数不对时的情况.
+ */
+ @Test
+ public void renderWithLongTitle() {
+ String table = new MiniTable("This is a too long title.")
+ .addHeaders("col11", "col12")
+ .render();
+ Assert.assertEquals(""
+ + "+---------------+\n"
+ + "| This is a too |\n"
+ + "+-------+-------+\n"
+ + "| col11 | col12 |\n"
+ + "+-------+-------+\n", table);
+ }
+
+}
\ No newline at end of file