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Improve escaper performance

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This commit is contained in:
David
2017-03-28 22:21:35 +02:00
parent 6903bcbe4d
commit 29e16df057
3 changed files with 80 additions and 17 deletions
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6
pom.xml
View File

@@ -52,6 +52,12 @@
<version>1.3</version> <version>1.3</version>
<scope>test</scope> <scope>test</scope>
</dependency> </dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.0</version>
<scope>test</scope>
</dependency>
</dependencies> </dependencies>
<packaging>jar</packaging> <packaging>jar</packaging>

40
src/main/java/j2html/utils/SimpleEscaper.java
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@@ -1,28 +1,36 @@
package j2html.utils; package j2html.utils;
import java.util.HashMap;
import java.util.Map;
public class SimpleEscaper { public class SimpleEscaper {
private static Map<Character, String> map = new HashMap<Character, String>() {{
put('&', "&amp;");
put('<', "&lt;");
put('>', "&gt;");
put('"', "&quot;");
put('\'', "&#x27;");
}};
public static String escape(String s) { public static String escape(String s) {
if (s == null) { if (s == null) {
return null; return null;
} }
String escapedString = ""; StringBuilder escapedText = new StringBuilder();
for(char c : s.toCharArray()) { char currentChar;
String escaped = map.get(c); for (int i = 0; i < s.length(); i++) {
escapedString += escaped != null ? escaped : c; currentChar = s.charAt(i);
switch (currentChar) {
case '<':
escapedText.append("&lt;");
break;
case '>':
escapedText.append("&gt;");
break;
case '&':
escapedText.append("&amp;");
break;
case '"':
escapedText.append("&quot;");
break;
case '\'':
escapedText.append("&#x27;");
break;
default:
escapedText.append(currentChar);
} }
return escapedString; }
return escapedText.toString();
} }
} }

49
src/test/java/j2html/PerformanceTest.java Normal file
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@@ -0,0 +1,49 @@
package j2html;
import java.util.concurrent.Callable;
import org.apache.commons.lang3.StringEscapeUtils;
import org.junit.Test;
import j2html.utils.SimpleEscaper;
public class PerformanceTest {
private String shortTestString = "<body>\n"
+ " <h1 class=\"example\">Heading!</h1>\n"
+ " <img src=\"img/hello.png\">\n"
+ "</body>";
// syntax-highlighted getting started example from j2html.com:
private String longTestString =
"<pre class=\" language-java\"><code class=\" language-java\"><span class=\"token keyword\">import</span> <span class=\"token keyword\">static</span> j2html<span class=\"token punctuation\">.</span>TagCreator<span class=\"token punctuation\">.</span>*<span class=\"token punctuation\">;</span>\n"
+ "\n"
+ "<span class=\"token keyword\">public</span> <span class=\"token keyword\">class</span> <span class=\"token class-name\">Main</span> <span class=\"token punctuation\">{</span>\n"
+ " <span class=\"token keyword\">public</span> <span class=\"token keyword\">static</span> <span class=\"token keyword\">void</span> <span class=\"token function\">main<span class=\"token punctuation\">(</span></span>String<span class=\"token punctuation\">[</span><span class=\"token punctuation\">]</span> args<span class=\"token punctuation\">)</span> <span class=\"token punctuation\">{</span>\n"
+ " <span class=\"token function\">body<span class=\"token punctuation\">(</span></span><span class=\"token punctuation\">)</span><span class=\"token punctuation\">.</span><span class=\"token function\">with<span class=\"token punctuation\">(</span></span>\n"
+ " <span class=\"token function\">h1<span class=\"token punctuation\">(</span></span><span class=\"token string\">\"Heading!\"</span><span class=\"token punctuation\">)</span><span class=\"token punctuation\">.</span><span class=\"token function\">withClass<span class=\"token punctuation\">(</span></span><span class=\"token string\">\"example\"</span><span class=\"token punctuation\">)</span><span class=\"token punctuation\">,</span>\n"
+ " <span class=\"token function\">img<span class=\"token punctuation\">(</span></span><span class=\"token punctuation\">)</span><span class=\"token punctuation\">.</span><span class=\"token function\">withSrc<span class=\"token punctuation\">(</span></span><span class=\"token string\">\"img/hello.png\"</span><span class=\"token punctuation\">)</span>\n"
+ " <span class=\"token punctuation\">)</span><span class=\"token punctuation\">.</span><span class=\"token function\">render<span class=\"token punctuation\">(</span></span><span class=\"token punctuation\">)</span><span class=\"token punctuation\">;</span>\n"
+ " <span class=\"token punctuation\">}</span>\n"
+ "<span class=\"token punctuation\">}</span>\n"
+ "</code></pre>";
@Test
public void test_escaper_performnce() throws Exception {
timeEscaper("SimpleEscaper#short", () -> SimpleEscaper.escape(shortTestString));
timeEscaper("SimpleEscaper#long", () -> SimpleEscaper.escape(longTestString));
timeEscaper("ApacheEscaper#short", () -> StringEscapeUtils.escapeHtml4(shortTestString));
timeEscaper("ApacheEscaper#long", () -> StringEscapeUtils.escapeHtml4(longTestString));
}
private void timeEscaper(String name, Callable escaper) throws Exception {
long startTime = System.nanoTime();
for (int i = 0; i < 1000; i++) {
escaper.call();
}
long endTime = System.nanoTime();
long durationMs = (endTime - startTime) / 1000000;
System.out.println(String.format("%-21s%s", name + ":", +durationMs + "ms"));
}
}