|
|
Java example source code file (QueryHandler.java)
This example Java source code file (QueryHandler.java) is included in the alvinalexander.com
"Java Source Code
Warehouse" project. The intent of this project is to help you "Learn
Java by Example" TM.
Learn more about this Java project at its project page.
The QueryHandler.java Java example source code
/*
* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* The Original Code is HAT. The Initial Developer of the
* Original Code is Bill Foote, with contributions from others
* at JavaSoft/Sun.
*/
package com.sun.tools.hat.internal.server;
import java.io.PrintWriter;
import com.sun.tools.hat.internal.model.*;
import com.sun.tools.hat.internal.util.Misc;
import java.io.StringWriter;
import java.net.URLEncoder;
import java.io.UnsupportedEncodingException;
/**
*
* @author Bill Foote
*/
abstract class QueryHandler {
protected String urlStart;
protected String query;
protected PrintWriter out;
protected Snapshot snapshot;
abstract void run();
void setUrlStart(String s) {
urlStart = s;
}
void setQuery(String s) {
query = s;
}
void setOutput(PrintWriter o) {
this.out = o;
}
void setSnapshot(Snapshot ss) {
this.snapshot = ss;
}
protected String encodeForURL(String s) {
try {
s = URLEncoder.encode(s, "UTF-8");
} catch (UnsupportedEncodingException ex) {
// Should never happen
ex.printStackTrace();
}
return s;
}
protected void startHtml(String title) {
out.print("<html>");
print(title);
out.println("</title>");
out.println("<body bgcolor=\"#ffffff\"><center><h1>");
print(title);
out.println("</h1></center>");
}
protected void endHtml() {
out.println("</body></html>");
}
protected void error(String msg) {
println(msg);
}
protected void printAnchorStart() {
out.print("<a href=\"");
out.print(urlStart);
}
protected void printThingAnchorTag(long id) {
printAnchorStart();
out.print("object/");
printHex(id);
out.print("\">");
}
protected void printObject(JavaObject obj) {
printThing(obj);
}
protected void printThing(JavaThing thing) {
if (thing == null) {
out.print("null");
return;
}
if (thing instanceof JavaHeapObject) {
JavaHeapObject ho = (JavaHeapObject) thing;
long id = ho.getId();
if (id != -1L) {
if (ho.isNew())
out.println("<strong>");
printThingAnchorTag(id);
}
print(thing.toString());
if (id != -1) {
if (ho.isNew())
out.println("[new]</strong>");
out.print(" (" + ho.getSize() + " bytes)");
out.println("</a>");
}
} else {
print(thing.toString());
}
}
protected void printRoot(Root root) {
StackTrace st = root.getStackTrace();
boolean traceAvailable = (st != null) && (st.getFrames().length != 0);
if (traceAvailable) {
printAnchorStart();
out.print("rootStack/");
printHex(root.getIndex());
out.print("\">");
}
print(root.getDescription());
if (traceAvailable) {
out.print("</a>");
}
}
protected void printClass(JavaClass clazz) {
if (clazz == null) {
out.println("null");
return;
}
printAnchorStart();
out.print("class/");
print(encodeForURL(clazz));
out.print("\">");
print(clazz.toString());
out.println("</a>");
}
protected String encodeForURL(JavaClass clazz) {
if (clazz.getId() == -1) {
return encodeForURL(clazz.getName());
} else {
return clazz.getIdString();
}
}
protected void printField(JavaField field) {
print(field.getName() + " (" + field.getSignature() + ")");
}
protected void printStatic(JavaStatic member) {
JavaField f = member.getField();
printField(f);
out.print(" : ");
if (f.hasId()) {
JavaThing t = member.getValue();
printThing(t);
} else {
print(member.getValue().toString());
}
}
protected void printStackTrace(StackTrace trace) {
StackFrame[] frames = trace.getFrames();
for (int i = 0; i < frames.length; i++) {
StackFrame f = frames[i];
String clazz = f.getClassName();
out.print("<font color=purple>");
print(clazz);
out.print("</font>");
print("." + f.getMethodName() + "(" + f.getMethodSignature() + ")");
out.print(" <bold>:</bold> ");
print(f.getSourceFileName() + " line " + f.getLineNumber());
out.println("<br>");
}
}
protected void printException(Throwable t) {
println(t.getMessage());
out.println("<pre>");
StringWriter sw = new StringWriter();
t.printStackTrace(new PrintWriter(sw));
print(sw.toString());
out.println("</pre>");
}
protected void printHex(long addr) {
if (snapshot.getIdentifierSize() == 4) {
out.print(Misc.toHex((int)addr));
} else {
out.print(Misc.toHex(addr));
}
}
protected long parseHex(String value) {
return Misc.parseHex(value);
}
protected void print(String str) {
out.print(Misc.encodeHtml(str));
}
protected void println(String str) {
out.println(Misc.encodeHtml(str));
}
}
</pre>
<div id="after_source_code">
<h2>Other Java examples (source code examples)</h2>
<p>Here is a short list of links related to this Java QueryHandler.java source code file:</p>
<ul>
<li><a href="/java/jwarehouse"><img src="/images/scw/find.png" border="0"> The search page</a></li>
<li><a href="index.shtml"><img src="/images/scw/folder.png" border="0"> Other Java source code examples at this package level</a></li>
<li><a href="/java/jwarehouse/about.shtml"><img src="/images/scw/information.png" border="0"> Click here to learn more about this project</a></li>
</ul>
</div>
</td>
</tr>
</table>
</div>
</div>
<div style="padding-top: 1em; width: 310px; margin-left: auto; margin-right: auto; table {border-collapse: collapse; border: none;}; tr {border-collapse: collapse; border: none; text-align: center;};">
<table width="100%" cellspacing="0" cellpadding="0">
<tr>
<td colspan="2" style="border-collapse: collapse; border: none; text-align: center;};">
<em>... this post is sponsored by my books ...</em>
</td>
</tr>
<tr>
<td width="150" style="border-collapse: collapse; border: none; text-align: center;};">
<a href="https://kbhr.co/ckbk-v2"><img
src="/images/books/scala-cookbook-v2-cover-220h.jpg"
title="The Scala Cookbook, by Alvin Alexander" height="220" />
<br /><span style="opacity: 0.4;">#1 New Release!</span></a>
</td>
<td width="150" style="border-collapse: collapse; border: none; text-align: center; padding-left: 8px;">
<a href="http://kbhr.co/fps-book"><img
src="/images/books/functional-programming-simplified-small.jpg"
title="Functional Programming, Simplified, by Alvin Alexander"
height="220" />
<br /><span style="opacity: 0.4;">FP Best Seller</span></a>
</td>
</tr>
</table>
<p> </p>
</div>
<div id="whats_new">
<h2>new blog posts</h2>
<div id="whats_new_list">
<ul>
<li><a class="whats_new_link" href="/photos/young-buddhist-monks-flight-training-class-school">Flight training school</a></li>
<li><a class="whats_new_link" href="/photos/last-draft-of-scala-cookbook">Last draft of the Scala Cookbook</a></li>
<li><a class="whats_new_link" href="/personal/shinzen-young-meditation-technique-noting-thoughts">Shinzen Young'''s mindfulness meditation technique for noting thoughts</a></li>
<br/>
<li><a class="whats_new_link" href="/misc/zen-way-of-calligraphy-zen-mind-beginners-suzuki">The Zen way of calligraphy ...</a></li>
<li><a class="whats_new_link" href="/misc/techcrunch-tracking-technology-industry-layoffs-2024">TechCrunch: Tracking layoffs in the technology industry</a></li>
<li><a class="whats_new_link" href="/photos/bluesky-what-it-is-why-join-instead-of-twitter-x-twix">Bluesky: What it is, and why join (instead of Twitter/X)</a></li>
<br/>
<li><a class="whats_new_link" href="/misc/bluesky-echo-chamber-surround-sound-for-facts">Echo chamber? Nah, we prefer to call it surround sound for facts.</a></li>
<li><a class="whats_new_link" href="/photos/huge-benefit-bluesky-social-network-custom-open-feeds-algorithms">Huge benefit of Bluesky: Different feeds (algorithms) you can choose from</a></li>
<li><a class="whats_new_link" href="/misc/all-great-persons-i-have-met-radical-humility-gratitude">All the truly great persons I have ever met are characterized by ... (quote)</a></li>
<br/>
<br/>
</div>
</ul>
</div>
<p> </p>
<p align="center"><font color="#000000" size="2"
face="Verdana,Arial">Copyright 1998-2024 Alvin Alexander, alvinalexander.com<br/>
All Rights Reserved.<br/>
<br/>
A percentage of advertising revenue from<br/>
pages under the <a href="/java/jwarehouse">/java/jwarehouse</a>
URI on this website is<br/>
paid back to open source projects.</p>
<script>
shuffle(books);
var div = document.getElementById("leftcol");
var pre = '<div style="margin: 0; padding-right: 1.6em"><h2 align="center">favorite books</h2>';
var post = '</div>';
if (adblock) {
var str = books.slice(0,3).join(" ");
div.insertAdjacentHTML('beforeend', pre + str + post);
} else {
var str = books.slice(0,1).join(" ");
div.insertAdjacentHTML('beforeend', pre + str + post);
}
</script>
<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-3075717592179848"
crossorigin="anonymous"></script>
<p style="padding-bottom: 80px;"> </p>
</body>
|