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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, 2018 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;

/*-
 * #%L
 * XSOM
 * %%
 * Copyright (C) 2019 - 2020 Entur
 * %%
 * Licensed under the EUPL, Version 1.1 or – as soon they will be
 * approved by the European Commission - subsequent versions of the
 * EUPL (the "Licence");
 * 
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * 
 * http://ec.europa.eu/idabc/eupl5
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 * #L%
 */

import com.sun.xml.xsom.XSElementDecl;
import com.sun.xml.xsom.XSModelGroup;
import com.sun.xml.xsom.XSModelGroupDecl;
import com.sun.xml.xsom.XSTerm;
import com.sun.xml.xsom.XSWildcard;
import com.sun.xml.xsom.impl.parser.SchemaDocumentImpl;
import com.sun.xml.xsom.visitor.XSFunction;
import com.sun.xml.xsom.visitor.XSTermFunction;
import com.sun.xml.xsom.visitor.XSTermFunctionWithParam;
import com.sun.xml.xsom.visitor.XSTermVisitor;
import com.sun.xml.xsom.visitor.XSVisitor;
import com.sun.xml.xsom.visitor.XSWildcardFunction;
import com.sun.xml.xsom.visitor.XSWildcardVisitor;
import org.xml.sax.Locator;

import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Iterator;
import java.util.Set;

public abstract class WildcardImpl extends ComponentImpl implements XSWildcard, Ref.Term
{
    protected WildcardImpl( SchemaDocumentImpl owner, AnnotationImpl _annon, Locator _loc, ForeignAttributesImpl _fa, int _mode ) {
        super(owner,_annon,_loc,_fa);
        this.mode = _mode;
    }
    
    private final int mode;
    public int getMode() { return mode; }
    
    // compute the union
    public WildcardImpl union( SchemaDocumentImpl owner, WildcardImpl rhs ) {
        if(this instanceof Any || rhs instanceof Any)
            return new Any(owner,null,null,null,mode);
        
        if(this instanceof Finite && rhs instanceof Finite) {
            Set values = new LinkedHashSet();
            values.addAll( ((Finite)this).names );
            values.addAll( ((Finite)rhs ).names );
            return new Finite(owner,null,null,null,values,mode);
        }
        
        if(this instanceof Other && rhs instanceof Other) {
            if( ((Other)this).otherNamespace.equals(
                ((Other)rhs).otherNamespace) )
                return new Other(owner,null,null,null, ((Other)this).otherNamespace, mode );
            else
                // this somewhat strange rule is indeed in the spec
                return new Other(owner,null,null,null, "", mode );
        }
        
        Other o;
        Finite f;
        
        if( this instanceof Other ) {
            o=(Other)this; f=(Finite)rhs;
        } else {
            o=(Other)rhs; f=(Finite)this;
        }
        
        if(f.names.contains(o.otherNamespace))
            return new Any(owner,null,null,null,mode);
        else
            return new Other(owner,null,null,null,o.otherNamespace,mode);
    }
    
    
    
    public final static class Any extends WildcardImpl implements XSWildcard.Any {
        public Any( SchemaDocumentImpl owner, AnnotationImpl _annon, Locator _loc, ForeignAttributesImpl _fa, int _mode ) {
            super(owner,_annon,_loc,_fa,_mode);
        }
        
        public boolean acceptsNamespace( String namespaceURI ) {
            return true;
        }
        public void visit( XSWildcardVisitor visitor ) {
            visitor.any(this);
        }
        public Object apply( XSWildcardFunction function ) {
            return function.any(this);
        }
    }
    
    public final static class Other extends WildcardImpl implements XSWildcard.Other {
        public Other( SchemaDocumentImpl owner, AnnotationImpl _annon, Locator _loc, ForeignAttributesImpl _fa,
                    String otherNamespace, int _mode ) {
            super(owner,_annon,_loc,_fa,_mode);
            this.otherNamespace = otherNamespace;
        }
        
        private final String otherNamespace;

        public String getOtherNamespace() { return otherNamespace; }
        
        public boolean acceptsNamespace( String namespaceURI ) {
            return !namespaceURI.equals(otherNamespace);
        }

        public void visit( XSWildcardVisitor visitor ) {
            visitor.other(this);
        }
        public Object apply( XSWildcardFunction function ) {
            return function.other(this);
        }
    }
    
    public final static class Finite extends WildcardImpl implements XSWildcard.Union {
        public Finite( SchemaDocumentImpl owner, AnnotationImpl _annon, Locator _loc, ForeignAttributesImpl _fa,
                    Set ns, int _mode ) {
            super(owner,_annon,_loc,_fa,_mode);
            names = ns;
            namesView = Collections.unmodifiableSet(names);
        }
        
        private final Set names;
        private final Set namesView;

        public Iterator iterateNamespaces() {
            return names.iterator();
        }

        public Collection getNamespaces() {
            return namesView;
        }

        public boolean acceptsNamespace( String namespaceURI ) {
            return names.contains(namespaceURI);
        }

        public void visit( XSWildcardVisitor visitor ) {
            visitor.union(this);
        }
        public Object apply( XSWildcardFunction function ) {
            return function.union(this);
        }
    }
    
    public final void visit( XSVisitor visitor ) {
        visitor.wildcard(this);
    }
    public final void visit( XSTermVisitor visitor ) {
        visitor.wildcard(this);
    }
    public Object apply( XSTermFunction function ) {
        return function.wildcard(this);
    }

    public  T apply(XSTermFunctionWithParam function, P param) {
        return function.wildcard(this,param);
    }

    public Object apply( XSFunction function ) {
        return function.wildcard(this);
    }


    public boolean isWildcard()                 { return true; }
    public boolean isModelGroupDecl()           { return false; }
    public boolean isModelGroup()               { return false; }
    public boolean isElementDecl()              { return false; }

    public XSWildcard asWildcard()              { return this; }
    public XSModelGroupDecl asModelGroupDecl()  { return null; }
    public XSModelGroup asModelGroup()          { return null; }
    public XSElementDecl asElementDecl()        { return null; }


    // Ref.Term implementation
    public XSTerm getTerm() { return this; }
}