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/*
 * Copyright (c) 2001-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 */

package com.sun.msv.reader.xmlschema;

import java.util.Iterator;

import com.sun.msv.grammar.Expression;
import com.sun.msv.grammar.NameClass;
import com.sun.msv.grammar.ReferenceContainer;
import com.sun.msv.grammar.ReferenceExp;
import com.sun.msv.grammar.trex.ElementPattern;
import com.sun.msv.grammar.xmlschema.ElementDeclExp;
import com.sun.msv.grammar.xmlschema.XMLSchemaSchema;
import com.sun.msv.reader.GrammarReader;
import com.sun.msv.reader.State;

/**
 * used to parse <any > element.
 * 
 * @author Kohsuke KAWAGUCHI
 */
public class AnyElementState extends AnyState
{
    protected Expression createExpression( final String namespace, final String process ) {
        final XMLSchemaReader reader = (XMLSchemaReader)this.reader;
        final XMLSchemaSchema currentSchema = reader.currentSchema;
        
        if( process.equals("skip") ) {
            // "skip" can be expanded now.
            NameClass nc = getNameClass(namespace,currentSchema);
            
            ElementPattern ep = new ElementPattern(nc,Expression.nullSet);
                
            ep.contentModel = 
                // 
                reader.pool.createMixed(
                    reader.pool.createZeroOrMore(
                        reader.pool.createChoice(
                            ep,
                            reader.pool.createAttribute(nc)
                        )
                    )
                );
                
            // minOccurs/maxOccurs is processed through interception
            return ep;
        }
        
        // "lax"/"strict" has to be back-patched later.
        final ReferenceExp exp = new ReferenceExp("any("+process+":"+namespace+")");
        reader.addBackPatchJob( new GrammarReader.BackPatch(){
            public State getOwnerState() { return AnyElementState.this; }
            public void patch() {

                if( !process.equals("lax")
                &&  !process.equals("strict") )  {
                    reader.reportError( XMLSchemaReader.ERR_BAD_ATTRIBUTE_VALUE, "processContents", process );
                    exp.exp = Expression.nullSet;
                    return;
                }
                
                exp.exp = Expression.nullSet;
                NameClass nc = getNameClass(namespace,currentSchema);
                Iterator itr;
                itr = reader.grammar.iterateSchemas();
                while( itr.hasNext() ) {
                    XMLSchemaSchema schema = (XMLSchemaSchema)itr.next();
                    // nc is built by using NamespaceNameClass.
                    // "strict" allows global element declarations of 
                    // specified namespaces.
                    if(nc.accepts( schema.targetNamespace, NameClass.LOCALNAME_WILDCARD ))
                        // schema.topLevel is choices of globally declared elements.
                        exp.exp = reader.pool.createChoice( exp.exp, schema.topLevel );
                }
                
                if( !process.equals("lax") )
                    return;    // if processContents="strict", the above is fine.
                
                // if "lax", we have to add an expression to
                // match other elements.
                NameClass laxNc = createLaxNameClass( nc,
                    new XMLSchemaReader.RefResolver() {
                        public ReferenceContainer get( XMLSchemaSchema schema ) {
                            return schema.elementDecls;
                        }
                    });
                
                exp.exp = reader.pool.createChoice(
                    new ElementPattern( laxNc,
                        reader.pool.createMixed(
                            reader.pool.createZeroOrMore(
                                reader.pool.createChoice(
                                    reader.pool.createAttribute(NameClass.ALL),
                                    exp)))),
                     exp.exp );
            }
        });
        
        exp.exp = Expression.nullSet;    // dummy for a while.
        
        // minOccurs/maxOccurs is processed through interception
        return exp;
    }

    protected NameClass getNameClassFrom( ReferenceExp exp ) {
        return ((ElementDeclExp)exp).getElementExp().getNameClass();
    }
    
}