Created
February 4, 2016 07:19
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| import java.util.HashMap; | |
| import java.util.Map; | |
| import java.util.function.Supplier; | |
| public class TemplateEvaluator { | |
| private Map<String, Supplier<String>> keywords = new HashMap<>(); | |
| public void addTemplateVariable(String keyword, Supplier<String> template) { | |
| keywords.put(keyword, template); | |
| } | |
| public String evaluteTemplate(String template) { | |
| StringBuilder sbTemplate = new StringBuilder(); | |
| int prevIndex = 0; | |
| int index = nextIndex(prevIndex, template); | |
| while (index > -1) { | |
| sbTemplate.append(template.substring(0, index)); | |
| template = template.substring(index); | |
| index = template.indexOf("}"); | |
| String keyword = template.substring(2, index); | |
| sbTemplate.append(keywords.get(keyword).get()); | |
| template = template.substring(index + 1); | |
| index = template.indexOf("${"); | |
| } | |
| sbTemplate.append(template); | |
| return sbTemplate.toString(); | |
| } | |
| private int nextIndex(int index, String template) { | |
| return template.indexOf("${", index); | |
| } | |
| } |
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| import static org.junit.Assert.assertEquals; | |
| import java.time.LocalDate; | |
| import org.junit.Before; | |
| import org.junit.Test; | |
| public class TemplateEvaluatorTest { | |
| private TemplateEvaluator evaluator; | |
| @Before | |
| public void setup(){ | |
| evaluator = new TemplateEvaluator(); | |
| evaluator.addTemplateVariable("today", () -> LocalDate.now().toString()); | |
| evaluator.addTemplateVariable("year", () -> String.valueOf(LocalDate.now().getYear())); | |
| evaluator.addTemplateVariable("month", () -> String.valueOf(LocalDate.now().getMonthValue() + 1)); | |
| evaluator.addTemplateVariable("day", () -> String.valueOf(LocalDate.now().getDayOfMonth())); | |
| } | |
| @Test | |
| public void testTemplate(){ | |
| assertEquals(evaluator.evaluteTemplate("<html>${today}</html>"), "<html>" + LocalDate.now().toString() + "</html>"); | |
| } | |
| } |
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