/**************************************************************
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 *
 *************************************************************/

import com.sun.star.uno.UnoRuntime;
import com.sun.star.accessibility.XAccessible;
import com.sun.star.accessibility.XAccessibleContext;
import com.sun.star.accessibility.AccessibleRelation;
import com.sun.star.accessibility.XAccessibleRelationSet;
import com.sun.star.accessibility.AccessibleRelationType;
import com.sun.star.lang.IndexOutOfBoundsException;

import tools.NameProvider;

class AccessibleRelationHandler
    extends NodeHandler
{
    public NodeHandler createHandler( XAccessibleContext xContext )
    {
        AccessibleRelationHandler aHandler = null;
        if (xContext != null)
        {
            XAccessibleRelationSet xRelation = xContext.getAccessibleRelationSet();
            if (xRelation != null)
                aHandler = new AccessibleRelationHandler(xContext);
        }
        return aHandler;
    }

    public AccessibleRelationHandler()
    {
    }

    public AccessibleRelationHandler( XAccessibleContext xContext )
    {
        XAccessibleRelationSet xRelation = xContext.getAccessibleRelationSet();
        if (xRelation != null)
            maChildList.setSize( 1 );
    }

    public AccessibleTreeNode createChild( AccessibleTreeNode aParent,
                                           int nIndex )
    {
        XAccessibleRelationSet xRelation = null;
        AccessibleTreeNode aChild = null;

        if( aParent instanceof AccTreeNode )
        {
            xRelation =
                ((AccTreeNode)aParent).getContext().getAccessibleRelationSet();
        }
        if( xRelation == null )
            return aChild;


        VectorNode aVNode = new VectorNode( "RelationSet", aParent);
        int nCount = xRelation.getRelationCount();
        try
        {
            for( int i = 0; i < nCount; i++ )
            {
                AccessibleRelation aRelation = xRelation.getRelation( i );

                StringBuffer aBuffer = new StringBuffer();
                aBuffer.append (NameProvider.getRelationName (aRelation.RelationType));
                aBuffer.append( ": " );

                for( int j = 0; j < aRelation.TargetSet.length; j++ )
                {
                    Object aTarget = aRelation.TargetSet[j];
                    XAccessible xAccTarget =
                        (XAccessible)UnoRuntime.queryInterface(
                             XAccessible.class, aTarget );
                    if( xAccTarget == null )
                    {
                        aBuffer.append( aTarget.toString() );
                    }
                    else
                    {
                        aBuffer.append( xAccTarget.getAccessibleContext().
                                         getAccessibleName() );
                    }
                    aBuffer.append( ", " );
                }
                aBuffer.delete( aBuffer.length() - 2, aBuffer.length() );

                aVNode.addChild( new StringNode( aBuffer.toString(),
                                                 aParent ) );
            }

            aChild = aVNode;
        }
        catch( IndexOutOfBoundsException e )
        {
            aChild = new StringNode( "IndexOutOfBounds", aParent );
        }

        return aChild;
    }
}