/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2002-2013 Pentaho Corporation.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.states.datarow;
import java.util.Iterator;
import org.pentaho.reporting.engine.classic.core.event.PageEventListener;
import org.pentaho.reporting.engine.classic.core.function.Expression;
import org.pentaho.reporting.engine.classic.core.function.Function;
import org.pentaho.reporting.engine.classic.core.states.LayoutProcess;
import org.pentaho.reporting.engine.classic.core.util.IntList;
import org.pentaho.reporting.engine.classic.core.util.IntegerCache;
import org.pentaho.reporting.engine.classic.core.util.LevelList;
public class LevelStorageBackend
{
private static final Integer[] EMPTY_INTEGERARRAY = new Integer[0];
private static class LevelStorageImpl implements LevelStorage
{
private LevelStorageBackend levelData;
private Expression[] expressions;
private LevelStorageImpl(final LevelStorageBackend levelData,
final Expression[] expressions)
{
this.levelData = levelData;
this.expressions = expressions;
}
public int getLevelNumber()
{
return levelData.getLevelNumber();
}
public Iterator<Function> getFunctions()
{
return new IndirectIndexIterator<Function>(levelData.getFunctions(), expressions);
}
public Iterator<Function> getPageFunctions()
{
return new IndirectIndexIterator<Function>(levelData.getPageEventListeners(), expressions);
}
public Iterator<Expression> getActiveExpressions()
{
return new IndirectIndexIterator<Expression>(levelData.getActiveExpressions(), expressions);
}
}
private int levelNumber;
private int[] activeExpressions;
private int[] functions;
private int[] pageEventListeners;
public LevelStorageBackend(final int levelNumber,
final int[] activeExpressions,
final int[] functions,
final int[] pageEventListeners)
{
if (pageEventListeners == null)
{
throw new NullPointerException();
}
if (activeExpressions == null)
{
throw new NullPointerException();
}
if (functions == null)
{
throw new NullPointerException();
}
this.levelNumber = levelNumber;
this.activeExpressions = activeExpressions;
this.functions = functions;
this.pageEventListeners = pageEventListeners;
}
public int getLevelNumber()
{
return levelNumber;
}
public int[] getFunctions()
{
return functions;
}
/**
* @return Returns the activeExpressions.
*/
public int[] getActiveExpressions()
{
return activeExpressions;
}
/**
* @return Returns the pageEventListeners.
*/
public int[] getPageEventListeners()
{
return pageEventListeners;
}
public boolean hasPageEventListeners()
{
return pageEventListeners != null && pageEventListeners.length > 0;
}
public static LevelStorageBackend[] revalidate(final Expression[] expressions,
final int length,
final boolean includeStructuralProcessing)
{
// recompute the level storage ..
final LevelList levelList = new LevelList();
int minLevel = Integer.MIN_VALUE;
for (int i = 0; i < length; i++)
{
final Expression expression = expressions[i];
// The list maps the current position to the level ..
final int dependencyLevel = expression.getDependencyLevel();
levelList.add(IntegerCache.getInteger(i), dependencyLevel);
if (minLevel < dependencyLevel)
{
minLevel = dependencyLevel;
}
}
if (includeStructuralProcessing)
{
if (minLevel > Integer.MIN_VALUE)
{
for (int i = 0; i < length; i++)
{
final Expression expression = expressions[i];
// The list maps the current position to the level ..
final int dependencyLevel = expression.getDependencyLevel();
if (dependencyLevel == minLevel && (expression instanceof Function == false))
{
// add this expression to the structural pre-processing so that it can influence the
// construction of the crosstab if needed.
levelList.add(IntegerCache.getInteger(i), LayoutProcess.LEVEL_STRUCTURAL_PREPROCESSING);
}
}
}
}
final Integer[] levels = levelList.getLevelsDescendingArray();
final LevelStorageBackend[] levelData = new LevelStorageBackend[levels.length];
final int expressionsCount = levelList.size();
final int capacity = Math.min(20, expressionsCount);
final IntList activeExpressions = new IntList(capacity);
final IntList functions = new IntList(capacity);
final IntList pageEventListeners = new IntList(capacity);
for (int i = 0; i < levels.length; i++)
{
final int currentLevel = levels[i].intValue();
final Integer[] data = (Integer[])
levelList.getElementArrayForLevel(currentLevel, EMPTY_INTEGERARRAY);
for (int x = 0; x < data.length; x++)
{
final Integer position = data[x];
final Expression ex = expressions[position.intValue()];
final int globalPosition = position.intValue();
if (ex instanceof Function == false)
{
if (ex.getName() != null)
{
activeExpressions.add(globalPosition);
}
continue;
}
activeExpressions.add(globalPosition);
functions.add(globalPosition);
if (ex instanceof PageEventListener)
{
pageEventListeners.add(globalPosition);
}
}
levelData[i] = new LevelStorageBackend(currentLevel,
activeExpressions.toArray(),
functions.toArray(), pageEventListeners.toArray());
activeExpressions.clear();
functions.clear();
pageEventListeners.clear();
}
return levelData;
}
public static LevelStorage getLevelStorage(final LevelStorageBackend levelStorageBackend,
final Expression[] expressions)
{
return new LevelStorageImpl(levelStorageBackend, expressions);
}
}