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package org.apache.openoffice.ooxml.schema.model.complex;

import org.apache.openoffice.ooxml.schema.model.base.INodeVisitor;
import org.apache.openoffice.ooxml.schema.model.base.Location;
import org.apache.openoffice.ooxml.schema.model.base.Node;
import org.apache.openoffice.ooxml.schema.model.base.NodeType;

/** An occurrence indicator is based on a minimum and a maximum value.
 *  The minimum value is 0 or larger.  If it is 0 then the child node is optional.
 *  The maximum value is at least as large as the minimum value.
 *  It can be 'unbounded' in which case the child node can appear any number of times.
 *  'Unbounded' is internally stored as -1.
 *  
 *  An OccurrenceIndicator represents the minOccur and maxOccur attributes of
 *  XML schema elements.
 *   
 *  There is usually exactly one child.
 */
public class OccurrenceIndicator
    extends Node
{
    public static int unbounded = -1;

    public OccurrenceIndicator (
        final Node aParent,
        final String sMinimum,
        final String sMaximum,
        final Location aLocation)
    {
        super(aParent, null, aLocation);
        
        mnMinimum = ParseValue(sMinimum);
        mnMaximum = ParseValue(sMaximum);
        
        assert(mnMinimum>=0);
        assert(mnMaximum==unbounded || mnMaximum>=mnMinimum);
    }
    
    
    
    
    @Override
    public NodeType GetNodeType ()
    {
        return NodeType.OccurrenceIndicator;
    }
    
    
    
    
    /** Return a string version of the minimum value for textual display.
     */
    public String GetDisplayMinimum ()
    {
        return Integer.toString(mnMinimum);
    }
    

    
    
    /** Return a string version of the maximum value for textual display.
     */
    public String GetDisplayMaximum ()
    {
        if (mnMaximum == unbounded)
            return "unbounded";
        else
            return Integer.toString(mnMaximum);
    }
    
    
    
    
    public int GetMinimum ()
    {
        return mnMinimum;
    }
    
    
    
    
    public int GetMaximum ()
    {
        return mnMaximum;
    }

    
    
    
    @Override
    public void AcceptVisitor (final INodeVisitor aVisitor)
    {
        aVisitor.Visit(this);
    } 
    
    
    
    
    @Override
    public String toString ()
    {
        return String.format("occurrence %s to %s",
            GetDisplayMinimum(),
            GetDisplayMaximum());
    }
    
    
    
    
    private static int ParseValue (final String sValue)
    {
        if (sValue == null)
        {
            // Missing values default to 1.
            return 1;
        }
        else
            switch (sValue)
            {
                case "0" : return 0;
                case "1" : return 1;
                case "unbounded" : return unbounded;
                default: return Integer.parseInt(sValue);
            }
    }
    
    
    
    private final int mnMinimum;
    private final int mnMaximum;
}
