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CompareTablesQuery.java
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CompareTablesQuery.java
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/*******************************************************************************
* Copyright (c) 2010, 2023 SAP AG and IBM Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors: SAP AG - initial API and implementation
* Andrew Johnson - conversion to proper query, set operations via contexts
******************************************************************************/
package org.eclipse.mat.internal.snapshot.inspections;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Serializable;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.nio.charset.UnsupportedCharsetException;
import java.text.FieldPosition;
import java.text.Format;
import java.text.ParsePosition;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.mat.SnapshotException;
import org.eclipse.mat.collect.ArrayInt;
import org.eclipse.mat.internal.Messages;
import org.eclipse.mat.query.Bytes;
import org.eclipse.mat.query.BytesFormat;
import org.eclipse.mat.query.Column;
import org.eclipse.mat.query.ContextDerivedData;
import org.eclipse.mat.query.ContextDerivedData.DerivedOperation;
import org.eclipse.mat.query.ContextProvider;
import org.eclipse.mat.query.IContextObject;
import org.eclipse.mat.query.IContextObjectSet;
import org.eclipse.mat.query.IDecorator;
import org.eclipse.mat.query.IIconProvider;
import org.eclipse.mat.query.IQuery;
import org.eclipse.mat.query.IQueryContext;
import org.eclipse.mat.query.IResult;
import org.eclipse.mat.query.IResultTable;
import org.eclipse.mat.query.IResultTree;
import org.eclipse.mat.query.IStructuredResult;
import org.eclipse.mat.query.ResultMetaData;
import org.eclipse.mat.query.annotations.Argument;
import org.eclipse.mat.query.annotations.HelpUrl;
import org.eclipse.mat.query.annotations.Icon;
import org.eclipse.mat.query.annotations.Menu;
import org.eclipse.mat.query.annotations.Menu.Entry;
import org.eclipse.mat.query.refined.Filter;
import org.eclipse.mat.snapshot.ISnapshot;
import org.eclipse.mat.snapshot.OQL;
import org.eclipse.mat.snapshot.model.IClass;
import org.eclipse.mat.snapshot.model.IObject;
import org.eclipse.mat.snapshot.model.IObjectArray;
import org.eclipse.mat.snapshot.model.IPrimitiveArray;
import org.eclipse.mat.snapshot.model.NamedReference;
import org.eclipse.mat.snapshot.query.Icons;
import org.eclipse.mat.util.IProgressListener;
import org.eclipse.mat.util.MessageUtil;
import org.eclipse.mat.util.SimpleMonitor;
import org.eclipse.mat.util.VoidProgressListener;
import com.ibm.icu.text.DecimalFormat;
import com.ibm.icu.text.DecimalFormatSymbols;
import com.ibm.icu.text.NumberFormat;
@Icon("/META-INF/icons/compare.gif")
@HelpUrl("/org.eclipse.mat.ui.help/tasks/comparingdata.html")
@Menu({ @Entry(options = "-setop ALL")
,@Entry(options = "-mode DIFF_TO_PREVIOUS -prefix -mask \""
+ CompareTablesQuery.simplePattern
+ "\" -x java.util.HashMap$Node:key java.util.Hashtable$Entry:key java.util.WeakHashMap$Entry:referent java.util.concurrent.ConcurrentHashMap$Node:key;")
,@Entry(options = "-mode DIFF_TO_PREVIOUS -prefix -mask \""
+ CompareTablesQuery.complexPattern
+ "\" -x java.util.HashMap$Node:key java.util.Hashtable$Entry:key java.util.WeakHashMap$Entry:referent java.util.concurrent.ConcurrentHashMap$Node:key;")
,@Entry(options = "-mode DIFF_TO_PREVIOUS -prefix -mask \""
+ CompareTablesQuery.complexPattern
+ "\" -x java.util.HashMap$Node:key java.util.Hashtable$Entry:key java.util.WeakHashMap$Entry:referent java.util.concurrent.ConcurrentHashMap$Node:key; -setop ALL")
})
public class CompareTablesQuery implements IQuery
{
@Argument
public IStructuredResult[] tables;
@Argument
public IQueryContext queryContext;
@Argument(isMandatory = false)
public ISnapshot[] snapshots;
@Argument(isMandatory = false)
public Mode mode = Mode.ABSOLUTE;
@Argument(isMandatory = false)
public Operation setOp = Operation.NONE;
@Argument(isMandatory = false)
public int keyColumn = 1;
@Argument(isMandatory = false)
public Pattern mask;
@Argument(isMandatory = false)
public String replace;
@Argument(isMandatory = false)
public boolean prefix;
@Argument(isMandatory = false)
public boolean suffix;
// @Argument(isMandatory = false)
public boolean addrefs = true;
@Argument(isMandatory = false, flag = "x")
public String[] extraReferences;
@Argument(isMandatory = false, flag = "xfile")
public File extraReferencesListFile;
private boolean[] sameSnapshot;
static final String addressPattern = "\\s@ 0x[0-9a-f]+"; //$NON-NLS-1$
/**
* Pattern to match list of array references e.g.
* [1], [23], [33]
* [1], [23], [33], [55],...
*/
static final String arrayPattern = "^(\\[[0-9]+\\], ){0,100}\\[[0-9]+\\](,\\.\\.\\.)?$"; //$NON-NLS-1$
static final String arraySizePattern = "(?<=\\p{javaJavaIdentifierPart}\\[)\\d+(?=\\])"; //$NON-NLS-1$
static final String simplePattern = addressPattern + "|" + arrayPattern; //$NON-NLS-1$
static final String complexPattern = addressPattern + "|" + arrayPattern + "|" + arraySizePattern; //$NON-NLS-1$ //$NON-NLS-2$
static {
// Validate RegEx as it can't be done in the @Entry
Pattern.compile(simplePattern);
Pattern.compile(complexPattern);
}
public enum Mode
{
ABSOLUTE("ABSOLUTE"), // //$NON-NLS-1$
DIFF_TO_FIRST("DIFF_TO_FIRST"), // //$NON-NLS-1$
DIFF_TO_PREVIOUS("DIFF_TO_PREVIOUS"), //$NON-NLS-1$
DIFF_RATIO_TO_FIRST("DIFF_RATIO_TO_FIRST"), // //$NON-NLS-1$
DIFF_RATIO_TO_PREVIOUS("DIFF_RATIO_TO_PREVIOUS"); //$NON-NLS-1$
String label;
private Mode(String label)
{
this.label = label;
}
public String toString()
{
return label;
}
}
public enum Operation
{
NONE,
ALL,
INTERSECTION,
UNION,
SYMMETRIC_DIFFERENCE,
DIFFERENCE,
REVERSE_DIFFERENCE
}
public IResult execute(IProgressListener listener) throws Exception
{
if (tables == null) return null;
// Length 1 table is valid, and we need to process it in case it is from a different snapshot
// Check key column is present
for (int i = 0; i < tables.length; ++i)
{
if (tables[i] == null || keyColumn > tables[i].getColumns().length || keyColumn < 1)
throw new IllegalArgumentException(MessageUtil.format(Messages.CompareTablesQuery_MissingKeyColumn, keyColumn, i + 1));
}
IStructuredResult base = tables[0];
Column[] baseColumns = base.getColumns();
Column key = baseColumns[keyColumn-1];
sameSnapshot = new boolean[tables.length];
ISnapshot sn = (ISnapshot)queryContext.get(ISnapshot.class, null);
boolean foundTree = false;
for (int i = 0; i < tables.length; ++i)
{
sameSnapshot[i] = (snapshots[i] == null || sn.equals(snapshots[i]));
if (tables[i] instanceof IResultTree)
foundTree = true;
}
List<ComparedColumn> attributes = new ArrayList<ComparedColumn>();
for (int i = 0; i < baseColumns.length; i++)
{
if (i == keyColumn-1)
continue;
// Check for duplicate column names
int prevDuplicateCol = -1;
for (int k = 0; k < i - 1; ++k)
{
if (baseColumns[i].getLabel().equals(baseColumns[k].getLabel()))
prevDuplicateCol = k > keyColumn - 1 ? k - 1 : k; // Adjust for key column
}
int[] indexes = new int[tables.length];
for (int j = 0; j < indexes.length; j++)
{
if (prevDuplicateCol >= 0)
{
// Start search after previous found column
int pc = attributes.get(prevDuplicateCol).getColumnIndexes()[j];
int ci = getColumnIndex(baseColumns[i].getLabel(), tables[j], pc + 1);
// Not found, so duplicate the last column
if (ci == -1)
ci = pc;
indexes[j] = ci;
}
else
{
indexes[j] = getColumnIndex(baseColumns[i].getLabel(), tables[j], 0);
}
}
attributes.add(new ComparedColumn(baseColumns[i], indexes, true));
}
collectExtraRefs();
return foundTree ? new ComparisonResultTree(mergeKeys(null, listener), key, attributes, mode, setOp)
: new ComparisonResultTable(mergeKeys(null, listener), key, attributes, mode, setOp);
}
private int getColumnIndex(String name, IStructuredResult table, int colstart)
{
Column[] columns = table.getColumns();
for (int i = colstart; i < columns.length; i++)
{
if (columns[i].getLabel().equals(name)) return i;
}
return -1;
}
/**
* Calculate extra parts for the key.
* @param table index
* @param row
* @return a String or null
*/
String extraKey(int table, Object row)
{
final String noextra = null;
if (extraReferences == null || extraReferences.length == 0)
return noextra;
if (snapshots[table] == null)
return noextra;
IContextObject ctx = tables[table].getContext(row);
if (ctx == null)
return noextra;
int objId = ctx.getObjectId();
if (objId == -1)
return noextra;
IObject obj = null;
IClass cls;
try
{
// Just resolve the type for now
cls = snapshots[table].getClassOf(objId);
}
catch (SnapshotException e)
{
return noextra;
}
StringBuilder sb = new StringBuilder();
for (String s : extraReferences)
{
String p1[] = s.split(":", 2); //$NON-NLS-1$
if (p1.length < 1)
continue;
try
{
if (cls.doesExtend(p1[0]))
{
if (obj == null)
obj = snapshots[table].getObject(objId);
if (p1.length < 2)
{
// Just the class name, so resolve just the object
String val = obj.getClassSpecificName();
if (val != null)
{
if (sb.length() > 0)
sb.append(' ');
sb.append(val);
}
continue;
}
for (String field : p1[1].split(",")) //$NON-NLS-1$
{
Object o;
try
{
o = obj.resolveValue(field);
}
catch (SnapshotException e)
{
continue;
}
String val;
if (o instanceof IObject)
{
val = ((IObject)o).getClassSpecificName();
}
else if (o != null)
{
val = o.toString();
}
else
{
val = null;
}
if (val != null)
{
if (sb.length() > 0)
sb.append(' ');
sb.append(val);
}
}
}
}
catch (SnapshotException e)
{
}
}
if (sb.length() > 0)
return sb.toString();
return noextra;
}
/**
* Calculate extra prefix for the key.
* Look for the immediate dominator and see if any fields point to this.
* Also do this for small object arrays.
* @param table index
* @param row
* @return a String or null
*/
String extraPrefix(int table, Object row)
{
// Only generate prefixes for small dominator arrays
final int SMALL_ARRAY_SIZE = 512;
final String noextra = null;
if (!addrefs)
return noextra;
if (snapshots[table] == null)
return noextra;
IContextObject ctx = tables[table].getContext(row);
if (ctx == null)
return noextra;
int objId = ctx.getObjectId();
if (objId == -1)
return noextra;
StringBuilder sb = new StringBuilder();
try
{
int immdom = snapshots[table].getImmediateDominatorId(objId);
if (immdom >= 0)
{
if (!snapshots[table].isArray(immdom))
{
IObject immobj = snapshots[table].getObject(immdom);
for (NamedReference ref : immobj.getOutboundReferences())
{
if (ref.getObjectId() == objId)
{
if (sb.length() > 0)
sb.append(',');
sb.append(ref.getName());
}
}
}
else
{
if (snapshots[table].getClassOf(immdom).getObjectId() == objId)
sb.append("<class>"); //$NON-NLS-1$
// Big arrays could be expensive to read
if (snapshots[table].getHeapSize(immdom) < SMALL_ARRAY_SIZE)
{
long objAddress = snapshots[table].mapIdToAddress(objId);
IObject immobj = snapshots[table].getObject(immdom);
// Don't get named references for object array - expensive
if (immobj instanceof IObjectArray)
{
// Arrays can be huge, extracting references could be huge
IObjectArray heapArray = (IObjectArray)immobj;
int length = heapArray.getLength();
int step = 65536;
int maxarray = 1024*1024;
int maxattribute = 150;
boolean big = length > maxarray;
if (big)
{
length = maxarray;
}
for (int i = 0; i < length; i += step)
{
long l[] = heapArray.getReferenceArray(i, Math.min(step, length - i));
for (int j = 0; j < l.length; ++j)
{
if (l[j] == objAddress)
{
if (sb.length() > 0)
sb.append(", "); //$NON-NLS-1$
int sl = sb.length();
sb.append('[');
sb.append(i + j);
sb.append(']');
if (sb.length() > maxattribute)
{
// Remove space after comma?
if (sl > 0)
sl--;
sb.delete(sl, sb.length());
sb.append("..."); //$NON-NLS-1$
big = false;
i = length;
break;
}
}
}
}
if (big)
{
if (sb.length() > 0)
sb.append(",..."); //$NON-NLS-1$
}
}
}
}
}
}
catch (SnapshotException e1)
{
}
if (sb.length() > 0)
return sb.toString();
return noextra;
}
/**
* Collect the extra type+field references.
*/
void collectExtraRefs() throws IOException
{
// extra key refs
// read the file (if any)
String[] fromFile = getLinesFromFile();
if (fromFile != null && fromFile.length > 0)
{
if (extraReferences != null)
{
// merge from file and manually entered entries
String[] tmp = new String[fromFile.length + extraReferences.length];
System.arraycopy(fromFile, 0, tmp, 0, fromFile.length);
System.arraycopy(extraReferences, 0, tmp, fromFile.length, extraReferences.length);
extraReferences = tmp;
}
else
{
extraReferences = fromFile;
}
}
}
/**
* Read from a file.
* @return an array of strings of lines from the file,
* not including line termination characters.
* @throws IOException
*/
private String[] getLinesFromFile() throws IOException
{
if (extraReferencesListFile == null)
return null;
List<String> result = new ArrayList<String>();
Charset cs;
try
{
String encoding = ResourcesPlugin.getEncoding();
if (encoding != null)
cs = Charset.forName(encoding);
else
cs = StandardCharsets.UTF_8;
}
catch (UnsupportedCharsetException e)
{
cs = StandardCharsets.UTF_8;
}
try (FileInputStream fis = new FileInputStream(extraReferencesListFile);
InputStreamReader isr = new InputStreamReader(fis, cs);
BufferedReader in = new BufferedReader(isr))
{
String line = null;
while ((line = in.readLine()) != null)
{
result.add(line);
}
}
return result.toArray(new String[result.size()]);
}
/**
* Hold a place for a row when the key is a duplicate.
*/
static class PlaceHolder
{
Object key;
int pos;
PlaceHolder(Object key, int pos)
{
this.key = key;
this.pos = pos;
}
@Override
public int hashCode()
{
final int prime = 31;
int result = 1;
result = prime * result + ((key == null) ? 0 : key.hashCode());
result = prime * result + pos;
return result;
}
@Override
public boolean equals(Object obj)
{
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
PlaceHolder other = (PlaceHolder) obj;
if (key == null)
{
if (other.key != null)
return false;
}
else if (!key.equals(other.key))
return false;
if (pos != other.pos)
return false;
return true;
}
}
private List<ComparedRow> mergeKeys(ComparedRow parent, IProgressListener listener)
{
SimpleMonitor sm = new SimpleMonitor(Messages.CompareTablesQuery_Comparing, listener, new int[] {60,30,10});
Map<Object, Object[]> map = new LinkedHashMap<Object, Object[]>();
int sizes[] = new int[tables.length];
// Only get elements once
List<?>elements[] = new List<?>[tables.length];
// Calculate the total number of rows
int totalsize = 0;
for (int i = 0; i < tables.length; i++)
{
IStructuredResult table = tables[i];
int size;
if (table instanceof IResultTable)
{
if (parent == null)
size = ((IResultTable)table).getRowCount();
else
size = 0;
}
else if (table instanceof IResultTree)
{
if (parent == null)
{
elements[i] = ((IResultTree)table).getElements();
size = elements[i].size();
}
else
{
Object treerow = parent.getRows()[i];
if (treerow != null && ((IResultTree)table).hasChildren(treerow))
{
elements[i] = ((IResultTree)table).getChildren(treerow);
size = elements[i].size();
}
else
{
size = 0;
}
}
}
else
{
size = 0;
}
sizes[i] = size;
totalsize += size;
// For overflow
if (totalsize < 0)
totalsize = Integer.MAX_VALUE;
}
listener = sm.nextMonitor();
listener.beginTask(Messages.CompareTablesQuery_Initial, totalsize);
long sortwork = 0;
for (int i = 0; i < tables.length; i++)
{
listener.subTask(MessageUtil.format(Messages.CompareTablesQuery_InitialComparisonForTable, i + 1));
IStructuredResult table = tables[i];
int size = sizes[i];
List<?>treeRows;
if (table instanceof IResultTree)
{
treeRows = elements[i];
}
else
{
treeRows = null;
}
Column c = tables[i].getColumns()[keyColumn - 1];
IDecorator id = c.getDecorator();
Map<Object, Integer>lastcache = new HashMap<Object,Integer>();
for (int j = 0; j < size; j++)
{
Object row;
if (table instanceof IResultTable)
{
row = ((IResultTable)table).getRow(j);
}
else if (table instanceof IResultTree)
{
row = treeRows.get(j);
}
else
{
row = null;
}
Object key = table.getColumnValue(row, keyColumn-1);
key = modifyKey(i, id, row, key);
Object[] rows = map.get(key);
if (rows == null)
{
rows = new Object[tables.length];
map.put(key, rows);
}
int ii = 0;
if (lastcache.containsKey(key))
{
ii = lastcache.get(key);
}
while (rows[ii + i] != null)
{
/*
* Normally:
* rows[rowTable1, rowTableb]
* With duplicate keys from one Table we extend the array
* rows[rowTable1, rowTable2, rowTable1v2, rowTable2v2, rowTable1v3, null]
* etc.
* and later convert to multiple rows
*/
ii += tables.length;
if (ii >= rows.length)
{
sortwork -= rows.length * rows.length;
// Grow the row array
int spare = rows.length / tables.length / 2;
rows = Arrays.copyOf(rows, rows.length + (spare + 1) * tables.length);
map.put(key, rows);
sortwork += rows.length * rows.length;
}
}
rows[ii + i] = row;
if (ii > 0)
{
// With many duplicates it can take a long time to find a free slot, so cache the last used
lastcache.put(key, ii);
// Add a placeholder so that a row goes here
map.put(new PlaceHolder(key, ii), new Object[0]);
}
if (listener.isCanceled())
throw new IProgressListener.OperationCanceledException();
listener.worked(1);
}
}
listener.done();
listener = sm.nextMonitor();
listener.beginTask(Messages.CompareTablesQuery_Initial, totalsize);
// Match up duplicate keys
for (Map.Entry<Object, Object[]> entry : map.entrySet())
{
Object rows[] = entry.getValue();
if (rows.length > tables.length)
{
listener.subTask(MessageUtil.format(Messages.CompareTablesQuery_ResolvingDuplicateKey, entry.getKey()));
// Duplicated key, so expand to separate rows
if (!sortRows(rows, listener))
{
// Some statistics if it failed to fully sort
int tn = tables.length;
int total = 0;
int maxTableTotal = 0;
int maxTable = 0;
for (int i = 0; i < tn; ++i)
{
int t = 0;
for (int j = i; j < rows.length; j += tn)
{
if (rows[j] != null)
++t;
}
if (t > maxTableTotal)
{
maxTableTotal = t;
maxTable = i + 1;
}
total += t;
}
listener.sendUserMessage(IProgressListener.Severity.WARNING, MessageUtil.format(Messages.CompareTablesQuery_IncompleteSorting, entry.getKey(), maxTableTotal, maxTable, total), null);
};
// Guess n-squared work
listener.worked((int)(totalsize * (long)rows.length * rows.length / sortwork));
}
if (listener.isCanceled())
throw new IProgressListener.OperationCanceledException();
}
listener.done();
listener = sm.nextMonitor();
listener.beginTask(Messages.CompareTablesQuery_BuildingResult, totalsize);
List<ComparedRow> result = new ArrayList<ComparedRow>(map.size());
for (Map.Entry<Object, Object[]> entry : map.entrySet())
{
Object key = entry.getKey();
Object rows[] = entry.getValue();
if (key instanceof PlaceHolder)
{
// A subsequent duplicated key
PlaceHolder ph = (PlaceHolder)key;
// Find the real, sorted row list
rows = map.get(ph.key);
// Extract the appropriate part
Object rows1[] = Arrays.copyOfRange(rows, ph.pos, ph.pos + tables.length);
result.add(new ComparedRow(ph.key, rows1));
}
else if (rows.length <= tables.length)
result.add(new ComparedRow(entry.getKey(), entry.getValue()));
else
{
// Duplicated key, but this is the first record
Object rows1[] = Arrays.copyOfRange(rows, 0, tables.length);
result.add(new ComparedRow(entry.getKey(), rows1));
}
if (listener.isCanceled())
throw new IProgressListener.OperationCanceledException();
listener.worked(1);
}
listener.done();
return result;
}
private Object modifyKey(int i, IDecorator id, Object row, Object key)
{
String extrakey = extraKey(i, row);
if (extrakey != null)
{
key = key + " " + extrakey; //$NON-NLS-1$
}
if (mask != null && key != null)
{
String keystr = key.toString();
String keystr2 = mask.matcher(keystr).replaceAll(replace == null ? "" : replace); //$NON-NLS-1$
if (!keystr.equals(keystr2))
{
key = keystr2;
}
}
// Fix up decoration
if (prefix || suffix)
{
String pfx;
if (prefix)
{
if (id != null)
{
pfx = id.prefix(row);
if (pfx == null)
pfx = extraPrefix(i, row);
}
else
{
pfx = extraPrefix(i, row);
}
}
else
{
pfx = null;
}
String sfx = suffix && id != null ? id.suffix(row) : null;
if (mask != null && pfx != null)
{
pfx = mask.matcher(pfx).replaceAll(replace == null ? "" : replace); //$NON-NLS-1$
if (pfx.length() == 0)
pfx = null;
}
if (mask != null && sfx != null)
{
sfx = mask.matcher(sfx).replaceAll(replace == null ? "" : replace); //$NON-NLS-1$
if (sfx.length() == 0)
sfx = null;
}
if (pfx != null || sfx != null)
key = new ComparedRow(pfx, key, sfx, null);
}
return key;
}
/**
* See if two rows from two tables match.
* Do a bit more matching via IContextObject.
* Match via context object ID or address.
* @param table1 index
* @param row1
* @param table2 index
* @param row2
* @param matchType - the higher the number the more likely a match
* @return true if they seem the same
*/
boolean rowMatches(int table1, Object row1, int table2, Object row2, int matchType)
{
IContextObject ctx1 = tables[table1].getContext(row1);
IContextObject ctx2 = tables[table2].getContext(row2);
if (ctx1 == null && ctx2 == null)
return true;
if (ctx1 == null || ctx2 == null)
return false;
int objectId1 = ctx1.getObjectId();
int objectId2 = ctx2.getObjectId();
if (sameSnapshot[table1] && sameSnapshot[table2] ||
snapshots[table1].equals(snapshots[table2]))
{
//System.out.println("compare "+ctx1.getObjectId() +" "+ ctx2.getObjectId());
return objectId1 == objectId2;
}
if (objectId1 == -1 && objectId2 == -1)
return true;
if (objectId1 == -1 || objectId2 == -1)
return false;
try
{
// Classes don't match, so different
IClass cls1 = snapshots[table1].getClassOf(objectId1);
IClass cls2 = snapshots[table2].getClassOf(objectId2);
if (!cls1.getName().equals(cls2.getName()))
return false;
long addr1 = snapshots[table1].mapIdToAddress(objectId1);
long addr2 = snapshots[table2].mapIdToAddress(objectId2);
// Address match, guess the same?
if (addr1 == addr2)
return true;
// Compare using getClassSpecificName() but this could be done
// using the key by specifying the class in the key match
boolean skip = false;
if (cls1.isArrayType())
{
if (cls1 instanceof IPrimitiveArray)
{
IPrimitiveArray pa = (IPrimitiveArray)cls1;
int type = pa.getType();
switch (type)
{
// Normally no resolver for these types so skip
case IObject.Type.BOOLEAN:
case IObject.Type.SHORT:
case IObject.Type.INT:
case IObject.Type.LONG:
case IObject.Type.FLOAT:
case IObject.Type.DOUBLE:
skip = true;
break;
case IObject.Type.BYTE:
case IObject.Type.CHAR:
break;
}
}
else if (cls1 instanceof IObjectArray)
{
skip = true;
}
}
if (matchType >= 1 && !skip)
{
String val1 = snapshots[table1].getObject(objectId1).getClassSpecificName();
String val2 = snapshots[table2].getObject(objectId2).getClassSpecificName();
if (val1 != null)
return val1.equals(val2);
else
if (val2 != null)
return false;
// No class specific name, so not sure
}
if (matchType >= 2)
{
// Guess match on retained size, presuming it retains more than itself!
if (snapshots[table1].getRetainedHeapSize(objectId1) > snapshots[table1].getHeapSize(objectId1)
&& snapshots[table1].getRetainedHeapSize(objectId1) == snapshots[table2]
.getRetainedHeapSize(objectId2))
return true;
// Match primitive arrays by size if they are big enough
final long MINARRAYMATCHSIZE = 400;
if (cls1 instanceof IPrimitiveArray
&& snapshots[table1].getHeapSize(objectId1) == snapshots[table2].getHeapSize(objectId2)
&& snapshots[table1].getHeapSize(objectId1) >= MINARRAYMATCHSIZE)
return true;
}
return false;
}
catch (SnapshotException e)
{
return false;
}
}
/**
* Try to match rows from different tables. Have definite matches in same
* row. Unmatched can be anywhere.
*
* <pre>
* A2=B3,A2=C1,A3=B5,A4=C2
* [A1,B1,C1,A2,B2,C2,A3,B3,null,A4,B4,null,null,B5,null]
* A1 B1 C1
* A2 B2 C2
* A3 B3
* A4 B4
* B5
* </pre>
*
* Goes to:
*
* <pre>
* A1 B1
* A2 B3 C1
* A3 B5
* A4 B2 C2
* B4
* </pre>
* <ol>
* <li>find first match of B[1]..B[5] with A[1] and put in first slot (&
* shift others up)</li>
* <li>find next match of B[2]..B[5] in with A[2] and put in second slot (&
* shift others up)</li>
* <li>..</li>
* <li>find first match of C[1]..C[2] with A[1] and put in first slot (&
* shift others up)</li>
* <li>if no match find first match of C[1]..C[2] with B[1] and put in first
* slot (& shift others up)</li>
* <li>if no match find first match of C[2]..C[2] with A[2] and put in first
* slot (& shift others up)</li>
* </ol>
* Not perfect though:
*
* <pre>
* 1 1 2
* 2 3 5
* 3 5
* 4
* </pre>
*
* gives