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Java example source code file (QueryHandler.java)
This example Java source code file (QueryHandler.java) is included in the alvinalexander.com
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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>
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