/*
* FindBugs - Find bugs in Java programs
* Copyright (C) 2004-2005 Dave Brosius <dbrosius@users.sourceforge.net>
* Copyright (C) 2004-2005 University of Maryland
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package edu.umd.cs.findbugs.detect;
import org.apache.bcel.Repository;
import org.apache.bcel.classfile.Code;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.classfile.Method;
import edu.umd.cs.findbugs.BugInstance;
import edu.umd.cs.findbugs.BugReporter;
import edu.umd.cs.findbugs.BytecodeScanningDetector;
import edu.umd.cs.findbugs.ba.ClassContext;
public class BadAppletConstructor extends BytecodeScanningDetector {
private final BugReporter bugReporter;
private final JavaClass appletClass;
private boolean inConstructor;
public BadAppletConstructor(BugReporter bugReporter) {
this.bugReporter = bugReporter;
JavaClass appletClass = null;
try {
appletClass = Repository.lookupClass("java.applet.Applet");
} catch (ClassNotFoundException cnfe) {
bugReporter.reportMissingClass(cnfe);
}
this.appletClass = appletClass;
}
@Override
public void visitClassContext(ClassContext classContext) {
if (appletClass == null) {
return;
}
JavaClass cls = classContext.getJavaClass();
try {
if (cls.instanceOf(appletClass)) {
cls.accept(this);
}
} catch (ClassNotFoundException cnfe) {
bugReporter.reportMissingClass(cnfe);
}
}
@Override
public void visit(Method obj) {
inConstructor = obj.getName().equals("<init>");
}
@Override
public void visit(Code obj) {
if (inConstructor) {
super.visit(obj);
}
}
@Override
public void sawOpcode(int seen) {
if (seen == INVOKEVIRTUAL) {
String method = getNameConstantOperand();
String signature = getSigConstantOperand();
if (((method.equals("getDocumentBase") || method.equals("getCodeBase")) && signature.equals("()Ljava/net/URL;"))
|| (method.equals("getAppletContext") && signature.equals("()Ljava/applet/AppletContext;"))
|| (method.equals("getParameter") && signature.equals("(Ljava/lang/String;)Ljava/lang/String;"))) {
bugReporter.reportBug(new BugInstance(this, "BAC_BAD_APPLET_CONSTRUCTOR", NORMAL_PRIORITY)
.addClassAndMethod(this).addSourceLine(this));
}
}
}
}