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XML Schema Object Model (XSOM) is a Java library that allows applications to easily parse XML Schema documents and inspect information in them. It is expected to be useful for applications that need to take XML Schema as an input.

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/*
 * Copyright (c) 1997, 2019 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.xml.xsom.impl;

import com.sun.xml.xsom.XSComplexType;
import com.sun.xml.xsom.XSType;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

/**
 *
 *
 * @author
 *     Kohsuke Kawaguchi ([email protected])
 */
class ImplUtil {
    private static XSType[] listDirectSubstitutables( XSType _this ) {
        ArrayList r = new ArrayList();

        // TODO: handle @block
        Iterator itr = ((SchemaImpl)_this.getOwnerSchema()).parent.iterateTypes();
        while( itr.hasNext() ) {
            XSType t = (XSType)itr.next();
            if( t.getBaseType()==_this )
                r.add(t);
        }
        return (XSType[]) r.toArray(new XSType[r.size()]);
    }

    public static XSType[] listSubstitutables( XSType _this ) {
        Set substitables = new HashSet();
        buildSubstitutables( _this, substitables );
        return (XSType[]) substitables.toArray(new XSType[substitables.size()]);
    }

    public static void buildSubstitutables( XSType _this, Set substitutables ) {
        if( _this.isLocal() )    return;
        buildSubstitutables( _this, _this, substitutables );
    }

    private static void buildSubstitutables( XSType head, XSType _this, Set substitutables ) {
        if(!isSubstitutable(head,_this))
            return;    // no derived type of _this can substitute head.

        if(substitutables.add(_this)) {
            XSType[] child = listDirectSubstitutables(_this);
            for( int i=0; iValidation Rule: Schema-Validity Assessment (Element) 1.2.1.2.4
     */
    private static boolean isSubstitutable( XSType _base, XSType derived ) {
        // too ugly to the point that it's almost unbearable.
        // I mean, it's not even transitive. Thus we end up calling this method
        // for each candidate
        if( _base.isComplexType() ) {
            XSComplexType base = _base.asComplexType();

            for( ; base!=derived; derived=derived.getBaseType() ) {
                if( base.isSubstitutionProhibited( derived.getDerivationMethod() ) )
                    return false;    // Type Derivation OK (Complex)-1
            }
            return true;
        } else {
            // simple type don't have any @block
            return true;
        }
    }

}