.ReVo. |
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| Passato a format la stringa da formttare e in variables le variabili con cui bisogna sostituire le corrispondenze. CODICE import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* La classe ti permette di formattare una stringa X
* e di sostituire dei blocchi con valori di variabili.
*
* @author Marco Acierno
*/
public class Template {
private final Pattern pattern;
public Template(String start, String end) {
pattern = Pattern.compile(Pattern.quote(start) + "([^}]+)" + Pattern.quote(end));
}
public Template() {
this("{", "}");
}
public String format(String text, Map<String, String> variables) {
Matcher matcher = pattern.matcher(text);
/* appendReplacement e appendTail accettano solo StringBuffer */
StringBuffer buffer = new StringBuffer();
while (matcher.find()) {
String key = matcher.group(1);
String value = variables.get(key);
if (value == null) {
matcher.appendReplacement(buffer, "{" + key + "}");
continue;
}
matcher.appendReplacement(buffer, value);
}
matcher.appendTail(buffer);
return buffer.toString();
}
} Alcuni test-cases per capire come funziona: CODICE import org.junit.Test;
import java.util.HashMap;
import java.util.Map;
import static org.junit.Assert.*;
public class TemplateTest {
@Test
public void testFormat() throws Exception {
Template template = new Template();
String text = "Hello {who}, {saluto}";
String result = "Hello ReVo_, ok?";
Map<String, String> vars = new HashMap<>();
vars.put("who", "ReVo_");
vars.put("saluto", "ok?");
assertEquals(result, template.format(text, vars));
}
@Test
public void testWithoutAnyArgument() throws Exception {
Template template = new Template();
String text = "Hello world!";
String result = "Hello world!";
Map<String, String> vars = new HashMap<>();
vars.put("who", "ReVo_");
vars.put("saluto", "ok?");
assertEquals(result, template.format(text, vars));
}
@Test
public void testWithSomeArgumentsWithoutBind() throws Exception {
Template template = new Template();
String text = "Hello {world}!";
String result = "Hello {world}!";
Map<String, String> vars = new HashMap<>();
vars.put("who", "ReVo_");
vars.put("saluto", "ok?");
assertEquals(result, template.format(text, vars));
}
@Test
public void testWithADifferentStartEnd() throws Exception {
Template template = new Template("|", "|");
String text = "Hello |world|!";
String result = "Hello ReVo_!";
Map<String, String> vars = new HashMap<>();
vars.put("world", "ReVo_");
assertEquals(result, template.format(text, vars));
}
@Test
public void testWithADifferentStartEnd2() throws Exception {
Template template = new Template("|", "-");
String text = "Hello |world-!";
String result = "Hello ReVo_!";
Map<String, String> vars = new HashMap<>();
vars.put("world", "ReVo_");
assertEquals(result, template.format(text, vars));
}
} Ho creato questa classe per il progetto JBucket-API per specificare l'url dove eseguire la richiesta e le parti variabili: CODICE @Loader(url = "https://bitbucket.org/api/2.0/{type}/{username}/followers?page={page}", type = LoaderType.Followers) |
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