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/*
 * Copyright (c) 2001-2013 Oracle and/or its affiliates. All rights reserved.
 *
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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package com.sun.msv.reader.relax;

import com.sun.msv.grammar.Expression;
import com.sun.msv.reader.ExpressionOwner;
import com.sun.msv.reader.SimpleState;
import com.sun.msv.reader.State;
import com.sun.msv.util.StartTagInfo;

/**
 * Base implementation for HedgeRuleState and TopLevelState.
 * 
 * expects one and only one expression as its child.
 * 
 * @author Kohsuke KAWAGUCHI
 */
public abstract class HedgeRuleBaseState extends SimpleState implements ExpressionOwner
{
    private Expression contentModel = null;
    
    public void onEndChild( Expression exp )
    {// this method is called after child expression is found and parsed
        if( contentModel!=null )
            reader.reportError( RELAXReader.ERR_MORE_THAN_ONE_CHILD_EXPRESSION );
            // recover by ignoring previous expression
        
        contentModel = exp;
    }
    
    protected final void endSelf()
    {
        super.endSelf();
        
        if( contentModel==null )
        {
            reader.reportError( RELAXReader.ERR_MISSING_CHILD_EXPRESSION );
            return;    // recover by ignoring this hedgeRule.
        }
        
        endSelf(contentModel);    // do something useful with child expression
    }
    
    /** derived class will receive child expression by this method */
    protected abstract void endSelf( Expression contentModel );

    
    protected State createChildState( StartTagInfo tag ) {
        // particles only
        return reader.createExpressionChildState(this,tag);
    }
}