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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.XSParticle;
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;

import java.util.Arrays;
import java.util.Iterator;

public class ModelGroupImpl extends ComponentImpl implements XSModelGroup, Ref.Term
{
    public ModelGroupImpl( SchemaDocumentImpl owner, AnnotationImpl _annon, Locator _loc, ForeignAttributesImpl _fa,
                           Compositor _compositor, ParticleImpl[] _children ) {

        super(owner,_annon,_loc,_fa);
        this.compositor = _compositor;
        this.children = _children;

        if(compositor==null)
            throw new IllegalArgumentException();
        for( int i=children.length-1; i>=0; i-- )
            if(children[i]==null)
                throw new IllegalArgumentException();
    }

    private final ParticleImpl[] children;
    public ParticleImpl getChild( int idx ) { return children[idx]; }
    public int getSize() { return children.length; }

    public ParticleImpl[] getChildren() { return children; }


    private final Compositor compositor;
    public Compositor getCompositor() { return compositor; }


    public void redefine(ModelGroupDeclImpl oldMG) {
        for (ParticleImpl p : children)
            p.redefine(oldMG);
    }

    public Iterator iterator() {
        return Arrays.asList((XSParticle[])children).iterator();
    }


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

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



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

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

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

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