/* ====================================================================   Copyright 2004   Apache Software Foundation   Licensed under the Apache License, Version 2.0 (the "License");   you may not use this file except in compliance with the License.   You may obtain a copy of the License at       http://www.apache.org/licenses/LICENSE-2.0   Unless required by applicable law or agreed to in writing, software   distributed under the License is distributed on an "AS IS" BASIS,   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   See the License for the specific language governing permissions and   limitations under the License.==================================================================== */package org.apache.poi.hssf.model;import org.apache.poi.ddf.EscherDgRecord;import org.apache.poi.ddf.EscherDggRecord;import java.util.List;import java.util.ArrayList;/** * Provides utilities to manage drawing groups. * * @author Glen Stampoultzis (glens at apache.org) */public class DrawingManager2{    EscherDggRecord dgg;    List drawingGroups = new ArrayList( );    public DrawingManager2( EscherDggRecord dgg )    {        this.dgg = dgg;    }    public EscherDgRecord createDgRecord()    {        EscherDgRecord dg = new EscherDgRecord();        dg.setRecordId( EscherDgRecord.RECORD_ID );        short dgId = findNewDrawingGroupId();        dg.setOptions( (short) ( dgId << 4 ) );        dg.setNumShapes( 0 );        dg.setLastMSOSPID( -1 );        drawingGroups.add(dg);        dgg.addCluster( dgId, 0 );        dgg.setDrawingsSaved( dgg.getDrawingsSaved() + 1 );        return dg;    }    /**     * Allocates new shape id for the new drawing group id.     *     * @return a new shape id.     */    public int allocateShapeId(short drawingGroupId)    {        dgg.setNumShapesSaved( dgg.getNumShapesSaved() + 1 );        // Add to existing cluster if space available        for (int i = 0; i < dgg.getFileIdClusters().length; i++)        {            EscherDggRecord.FileIdCluster c = dgg.getFileIdClusters()[i];            if (c.getDrawingGroupId() == drawingGroupId && c.getNumShapeIdsUsed() != 1024)            {                int result = c.getNumShapeIdsUsed() + (1024 * (i+1));                c.incrementShapeId();                EscherDgRecord dg = getDrawingGroup(drawingGroupId);                dg.setNumShapes( dg.getNumShapes() + 1 );                dg.setLastMSOSPID( result );                if (result >= dgg.getShapeIdMax())                    dgg.setShapeIdMax( result + 1 );                return result;            }        }        // Create new cluster        dgg.addCluster( drawingGroupId, 0 );        dgg.getFileIdClusters()[dgg.getFileIdClusters().length-1].incrementShapeId();        EscherDgRecord dg = getDrawingGroup(drawingGroupId);        dg.setNumShapes( dg.getNumShapes() + 1 );        int result = (1024 * dgg.getFileIdClusters().length);        dg.setLastMSOSPID( result );        if (result >= dgg.getShapeIdMax())            dgg.setShapeIdMax( result + 1 );        return result;    }    ////////////  Non-public methods /////////////    short findNewDrawingGroupId()    {        short dgId = 1;        while ( drawingGroupExists( dgId ) )            dgId++;        return dgId;    }    EscherDgRecord getDrawingGroup(int drawingGroupId)    {        return (EscherDgRecord) drawingGroups.get(drawingGroupId-1);    }    boolean drawingGroupExists( short dgId )    {        for ( int i = 0; i < dgg.getFileIdClusters().length; i++ )        {            if ( dgg.getFileIdClusters()[i].getDrawingGroupId() == dgId )                return true;        }        return false;    }    int findFreeSPIDBlock()    {        int max = dgg.getShapeIdMax();        int next = ( ( max / 1024 ) + 1 ) * 1024;        return next;    }    public EscherDggRecord getDgg()    {        return dgg;    }}