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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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package com.sun.xml.xsom.impl;

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 org.xml.sax.Locator;

public class ModelGroupDeclImpl extends DeclarationImpl implements XSModelGroupDecl, Ref.Term
{
    public ModelGroupDeclImpl( SchemaDocumentImpl owner,
        AnnotationImpl _annon, Locator _loc, ForeignAttributesImpl _fa,
        String _targetNamespace, String _name,
        ModelGroupImpl _modelGroup ) {
        
        super(owner,_annon,_loc,_fa,_targetNamespace,_name,false);
        this.modelGroup = _modelGroup;
        
        if(modelGroup==null)
            throw new IllegalArgumentException();
    }
    
    private final ModelGroupImpl modelGroup;
    public XSModelGroup getModelGroup() { return modelGroup; }
    
    /**
     * This component is a redefinition of "oldMG". Fix up the internal state
     * as such. 
     */
    public void redefine( ModelGroupDeclImpl oldMG ) {
        modelGroup.redefine(oldMG);
    }
    
    
    public void visit( XSVisitor visitor ) {
        visitor.modelGroupDecl(this);
    }
    public void visit( XSTermVisitor visitor ) {
        visitor.modelGroupDecl(this);
    }
    public Object apply( XSTermFunction function ) {
        return function.modelGroupDecl(this);
    }

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

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


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

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


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