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SpotBugs: Because it's easy!
/*
* FindBugs - Find Bugs in Java programs
* Copyright (C) 2003-2007 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;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Map;
import javax.annotation.CheckForNull;
import org.apache.bcel.classfile.Method;
import org.apache.bcel.generic.MethodGen;
import edu.umd.cs.findbugs.ba.AnalysisContext;
import edu.umd.cs.findbugs.ba.AnalysisFeatures;
import edu.umd.cs.findbugs.ba.ClassContext;
import edu.umd.cs.findbugs.ba.Location;
/**
* Accumulate warnings that may occur at multiple source locations,
* consolidating them into a single warning.
*
* @author Bill Pugh
* @author David Hovemeyer
*/
public class BugAccumulator {
private final BugReporter reporter;
private final boolean performAccumulation;
private final Map map = new HashMap<>();
private final HashMap hashes = new HashMap<>();
private BugInstance lastBug;
private SourceLineAnnotation lastSourceLine;
static class Data {
public Data(int priority, SourceLineAnnotation primarySource) {
this.priority = priority;
this.primarySource = primarySource;
}
int priority;
SourceLineAnnotation primarySource;
LinkedHashSet allSource = new LinkedHashSet<>();
}
/**
* Constructor.
*
* @param reporter
* the BugReporter to which warnings should eventually be
* reported
*/
public BugAccumulator(BugReporter reporter) {
this.reporter = reporter;
performAccumulation = AnalysisContext.currentAnalysisContext().getBoolProperty(AnalysisFeatures.MERGE_SIMILAR_WARNINGS);
}
public @CheckForNull SourceLineAnnotation getLastBugLocation() {
return lastSourceLine;
}
public void forgetLastBug() {
Data d = map.get(lastBug);
if (d != null) {
d.allSource.remove(lastSourceLine);
if (d.allSource.isEmpty()) {
map.remove(lastBug);
hashes.remove(lastBug.getInstanceHash());
}
}
lastBug = null;
lastSourceLine = null;
}
/**
* Accumulate a warning at given source location.
*
* @param bug
* the warning
* @param sourceLine
* the source location
*/
public void accumulateBug(BugInstance bug, SourceLineAnnotation sourceLine) {
if (sourceLine == null) {
throw new NullPointerException("Missing source line");
}
int priority = bug.getPriority();
if (!performAccumulation) {
bug.addSourceLine(sourceLine);
} else {
bug.setPriority(Priorities.NORMAL_PRIORITY);
}
lastBug = bug;
lastSourceLine = sourceLine;
Data d = map.get(bug);
if (d == null) {
String hash = bug.getInstanceHash();
BugInstance conflictingBug = hashes.get(hash);
if (conflictingBug != null) {
if (conflictingBug.getPriority() <= priority) {
return;
}
map.remove(conflictingBug);
}
d = new Data(priority, sourceLine);
map.put(bug, d);
hashes.put(hash, bug);
} else if (d.priority > priority) {
if (d.priority >= Priorities.LOW_PRIORITY) {
reportBug(bug, d);
d.allSource.clear();
}
d.priority = priority;
d.primarySource = sourceLine;
} else if (priority >= Priorities.LOW_PRIORITY && priority > d.priority) {
bug.setPriority(priority);
reporter.reportBug(bug);
return;
}
d.allSource.add(sourceLine);
}
/**
* Accumulate a warning at source location currently being visited by given
* BytecodeScanningDetector.
*
* @param bug
* the warning
* @param visitor
* the BytecodeScanningDetector
*/
public void accumulateBug(BugInstance bug, BytecodeScanningDetector visitor) {
SourceLineAnnotation source = SourceLineAnnotation.fromVisitedInstruction(visitor);
accumulateBug(bug, source);
}
public Iterable uniqueBugs() {
return map.keySet();
}
public Iterable locations(BugInstance bug) {
return map.get(bug).allSource;
}
/**
* Report accumulated warnings to the BugReporter. Clears all accumulated
* warnings as a side-effect.
*/
public void reportAccumulatedBugs() {
for (Map.Entry e : map.entrySet()) {
BugInstance bug = e.getKey();
Data d = e.getValue();
reportBug(bug, d);
}
clearBugs();
}
public void reportBug(BugInstance bug, Data d) {
bug.setPriority(d.priority);
bug.addSourceLine(d.primarySource);
HashSet lines = new HashSet<>();
lines.add(d.primarySource.getStartLine());
d.allSource.remove(d.primarySource);
for (SourceLineAnnotation source : d.allSource) {
if (lines.add(source.getStartLine())) {
bug.addSourceLine(source);
bug.describe(SourceLineAnnotation.ROLE_ANOTHER_INSTANCE);
} /* else if (false && SystemProperties.ASSERTIONS_ENABLED) {
AnalysisContext.logError("Skipping duplicated source warning for " + bug.getInstanceHash() + " " + bug.getMessage());
}*/
}
reporter.reportBug(bug);
}
/**
* Clear all accumulated bugs without reporting them
*/
public void clearBugs() {
map.clear();
hashes.clear();
lastBug = null;
lastSourceLine = null;
}
public void accumulateBug(BugInstance bug, ClassContext classContext, Method method, Location location) {
accumulateBug(bug, SourceLineAnnotation.fromVisitedInstruction(classContext, method, location));
}
public void accumulateBug(BugInstance bug, ClassContext classContext, MethodGen methodGen, String sourceFile,
Location location) {
accumulateBug(bug, SourceLineAnnotation.fromVisitedInstruction(classContext, methodGen, sourceFile, location.getHandle()));
}
}