diff options
| -rw-r--r-- | build.xml | 3 | ||||
| -rw-r--r-- | usage_examples/CleanupExample_post.jpage | 22 | ||||
| -rw-r--r-- | usage_examples/CleanupExample_pre.jpage | 15 | ||||
| -rw-r--r-- | website/features/Cleanup.html | 62 |
4 files changed, 102 insertions, 0 deletions
@@ -74,6 +74,9 @@ <antcall target="-integrateSnippet"> <param name="transformationName" value="Data" /> </antcall> + <antcall target="-integrateSnippet"> + <param name="transformationName" value="Cleanup" /> + </antcall> <mkdir dir="dist" /> <tar destfile="dist/website.tar"> <tarfileset dir="build/website" /> diff --git a/usage_examples/CleanupExample_post.jpage b/usage_examples/CleanupExample_post.jpage new file mode 100644 index 00000000..91458459 --- /dev/null +++ b/usage_examples/CleanupExample_post.jpage @@ -0,0 +1,22 @@ +import java.io.*; + +public class CleanupExample { + public static void main(String[] args) throws IOException { + InputStream in = new FileInputStream(args[0]); + try { + OutputStream out = new FileOutputStream(args[1]); + try { + byte[] b = new byte[10000]; + while (true) { + int r = in.read(b); + if (r == -1) break; + out.write(b, 0, r); + } + } finally { + out.close(); + } + } finally { + in.close(); + } + } +} diff --git a/usage_examples/CleanupExample_pre.jpage b/usage_examples/CleanupExample_pre.jpage new file mode 100644 index 00000000..9f639171 --- /dev/null +++ b/usage_examples/CleanupExample_pre.jpage @@ -0,0 +1,15 @@ +import lombok.Cleanup; +import java.io.*; + +public class CleanupExample { + public static void main(String[] args) throws IOException { + @Cleanup InputStream in = new FileInputStream(args[0]); + @Cleanup OutputStream out = new FileOutputStream(args[1]); + byte[] b = new byte[10000]; + while (true) { + int r = in.read(b); + if (r == -1) break; + out.write(b, 0, r); + } + } +} diff --git a/website/features/Cleanup.html b/website/features/Cleanup.html new file mode 100644 index 00000000..53c94701 --- /dev/null +++ b/website/features/Cleanup.html @@ -0,0 +1,62 @@ +<!DOCTYPE html> +<html><head> + <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> + <link rel="stylesheet" type="text/css" href="../logi/reset.css" /> + <link rel="stylesheet" type="text/css" href="features.css" /> + <link rel="shortcut icon" href="../favicon.ico" type="image/x-icon" /> + <meta name="description" content="Spice up your java" /> + <title>@Cleanup</title> + <!--[if lt IE 7]><script type="text/javascript" src="logi/iepngfix_tilebg.js"></script><![endif]--> +</head><body><div id="pepper"> + <div class="meat"> + <div class="minimumHeight"></div> + <div class="header"><a href="../index.html">Project Lombok</a></div> + <h1>@Cleanup</h1> + <div class="overview"> + <h3>Overview</h3> + <p> + You can use <code>@Cleanup</code> to ensure a given resource is automatically cleaned up before the code execution path exits your + current scope. You do this by annotating any local variable declaration with the <code>@Cleanup</code> annotation like so:<br /> + <code>@Cleanup InputStream in = new FileInputStream("some/file");</code></br /> + As a result, at the end of the scope you're in, <code>in.close()</code> is called. This call is guaranteed to run by way of a + try/finally construct. Look at the example below to see how this works. + </p><p> + If the type of object you'd like to cleanup does not have a <code>close()</code> method, but some other no-argument method, you can + specify the name of this method like so:<br /> + <code>@Cleanup("dispose") org.eclipse.swt.widgets.CoolBar bar = new CoolBar(parent, 0);</code><br /> + By default, the cleanup method is presumed to be <code>close()</code>. A cleanup method that takes argument cannot be called via + <code>@Cleanup</code>. + </p> + </div> + <div class="snippets"> + <div class="pre"> + <h3>With Lombok</h3> + <div class="snippet">@HTML_PRE@</div> + </div> + <div class="sep"></div> + <div class="post"> + <h3>Vanilla Java</h3> + <div class="snippet">@HTML_POST@</div> + </div> + </div> + <div style="clear: left;"></div> + <div class="overview"> + <h3>Small print</h3><div class="smallprint"> + <p> + If your code throws an exception, and the cleanup method call that is then triggered also throws an exception, then the original exception + is hidden by the exception thrown by the cleanup call. You should <em>not</em> rely on this 'feature'. Preferably, lombok would like to generate + code so that, if the main body has thrown an exception, any exception thrown by the close call is silently swallowed (but if the main body + exited in any other way, exceptions by the close call will not be swallowed). The authors of lombok do not currently know of a feasible way + to implement this scheme, but if java updates allow it, or we find a way, we'll fix it. + </p><p> + You do still need to handle any exception that the cleanup method can generate! + </p> + </div> + </div> + <footer> + <a href="index.html">Back to features</a> | <a href="Data.html">Previous feature (@Data)</a> | <a href="Synchronized.html">Next feature (@Synchronized)</a><br /> + <span class="copyright">Copyright © 2009 Reinier Zwitserloot and Roel Spilker, licensed under the <a href="http://www.opensource.org/licenses/mit-license.php">MIT licence</a>.</span> + </footer> + <div style="clear: both;"></div> + </div> +</div></body></html> |