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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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/*
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 *
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 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 * GPL Classpath Exception:
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package com.sun.xml.xsom.impl;

import com.sun.xml.xsom.XSElementDecl;
import com.sun.xml.xsom.XSIdentityConstraint;
import com.sun.xml.xsom.XSModelGroup;
import com.sun.xml.xsom.XSModelGroupDecl;
import com.sun.xml.xsom.XSTerm;
import com.sun.xml.xsom.XSType;
import com.sun.xml.xsom.XSWildcard;
import com.sun.xml.xsom.XmlString;
import com.sun.xml.xsom.impl.parser.PatcherManager;
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 org.xml.sax.Locator;

import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class ElementDecl extends DeclarationImpl implements XSElementDecl, Ref.Term
{
    public ElementDecl( PatcherManager reader, SchemaDocumentImpl owner,
        AnnotationImpl _annon, Locator _loc, ForeignAttributesImpl fa,
        String _tns, String _name, boolean _anonymous,
        
        XmlString _defv, XmlString _fixedv,
        boolean _nillable, boolean _abstract, Boolean _form,
        Ref.Type _type, Ref.Element _substHead,
        int _substDisallowed, int _substExcluded,
        List idConstraints) {
        
        super(owner,_annon,_loc,fa,_tns,_name,_anonymous);
        
        this.defaultValue = _defv;
        this.fixedValue = _fixedv;
        this.nillable = _nillable;
        this._abstract = _abstract;
        this.form = _form;
        this.type = _type;
        this.substHead = _substHead;
        this.substDisallowed = _substDisallowed;
        this.substExcluded = _substExcluded;
        this.idConstraints = Collections.unmodifiableList((List)idConstraints);

        for (IdentityConstraintImpl idc : idConstraints)
            idc.setParent(this);

        if(type==null)
            throw new IllegalArgumentException();
    }
    
    private XmlString defaultValue;
    public XmlString getDefaultValue() { return defaultValue; }
    
    private XmlString fixedValue;
    public XmlString getFixedValue() { return fixedValue; }

    private boolean nillable;
    public boolean isNillable() { return nillable; }
    
    private boolean _abstract;
    public boolean isAbstract() { return _abstract; }
    
    private Ref.Type type;
    public XSType getType() { return type.getType(); }
    
    private Ref.Element substHead;
    public XSElementDecl getSubstAffiliation() {
        if(substHead==null)     return null;
        return substHead.get();
    }
    
    private int substDisallowed;
    public boolean isSubstitutionDisallowed( int method ) {
        return (substDisallowed&method)!=0;
    }
    
    private int substExcluded;
    public boolean isSubstitutionExcluded( int method ) {
        return (substExcluded&method)!=0;
    }

    private final List idConstraints;
    public List getIdentityConstraints() {
        return idConstraints;
    }

    private Boolean form;
    public Boolean getForm() {
        return form;
    }


    /**
     * @deprecated 
     */
    public XSElementDecl[] listSubstitutables() {
        Set s = getSubstitutables();
        return s.toArray(new XSElementDecl[s.size()]);
    }

    /** Set that represents element decls that can substitute this element. */
    private Set substitutables = null;

    /** Unmodifieable view of {@link #substitutables}. */
    private Set substitutablesView = null;
    
    public Set getSubstitutables() {
        if( substitutables==null ) {
            // if the field is null by the time this method
            // is called, it means this element is substitutable by itself only.
            substitutables = substitutablesView = Collections.singleton((XSElementDecl)this);
        }
        return substitutablesView;
    }
    
    protected void addSubstitutable( ElementDecl decl ) {
        if( substitutables==null ) {
            substitutables = new HashSet();
            substitutables.add(this);
            substitutablesView = Collections.unmodifiableSet(substitutables);
        }
        substitutables.add(decl);
    }
    
    
    public void updateSubstitutabilityMap() {
        ElementDecl parent = this;
        XSType type = this.getType(); 

        boolean rused = false;
        boolean eused = false;
        
        while( (parent=(ElementDecl)parent.getSubstAffiliation())!=null ) {
            
            if(parent.isSubstitutionDisallowed(XSType.SUBSTITUTION))
                continue;
            
            boolean rd = parent.isSubstitutionDisallowed(XSType.RESTRICTION);
            boolean ed = parent.isSubstitutionDisallowed(XSType.EXTENSION);

            if( (rd && rused) || ( ed && eused ) )   continue;
            
            XSType parentType = parent.getType();
            while (type!=parentType) {
                if(type.getDerivationMethod()==XSType.RESTRICTION)  rused = true;
                else                                                eused = true;
                
                type = type.getBaseType();
                if(type==null)  // parentType and type doesn't share the common base type. a bug in the schema.
                    break;
                
                if( type.isComplexType() ) {
                    rd |= type.asComplexType().isSubstitutionProhibited(XSType.RESTRICTION);
                    ed |= type.asComplexType().isSubstitutionProhibited(XSType.EXTENSION);
                }
                if (getRoot().getAnyType().equals(type)) break;
            }
            
            if( (rd && rused) || ( ed && eused ) )   continue;
            
            // this element can substitute "parent"
            parent.addSubstitutable(this);
        }
    }
    
    public boolean canBeSubstitutedBy(XSElementDecl e) {
        return getSubstitutables().contains(e);
    }

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

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



    
    public void visit( XSVisitor visitor ) {
        visitor.elementDecl(this);
    }
    public void visit( XSTermVisitor visitor ) {
        visitor.elementDecl(this);
    }
    public Object apply( XSTermFunction function ) {
        return function.elementDecl(this);
    }

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

    public Object apply( XSFunction function ) {
        return function.elementDecl(this);
    }
    
    
    // Ref.Term implementation
    public XSTerm getTerm() { return this; }
}