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/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
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package com.sun.org.apache.xerces.internal.impl.xs.traversers;

import com.sun.org.apache.xerces.internal.impl.xs.SchemaGrammar;
import com.sun.org.apache.xerces.internal.impl.xs.SchemaSymbols;
import com.sun.org.apache.xerces.internal.impl.xs.XSAnnotationImpl;
import com.sun.org.apache.xerces.internal.impl.xs.XSGroupDecl;
import com.sun.org.apache.xerces.internal.impl.xs.XSModelGroupImpl;
import com.sun.org.apache.xerces.internal.impl.xs.XSParticleDecl;
import com.sun.org.apache.xerces.internal.impl.xs.util.XInt;
import com.sun.org.apache.xerces.internal.util.DOMUtil;
import com.sun.org.apache.xerces.internal.util.XMLSymbols;
import com.sun.org.apache.xerces.internal.xni.QName;
import org.w3c.dom.Element;

/**
 * The model group schema component traverser.
 *
 * <group
 *   name = NCName>
 *   Content: (annotation?, (all | choice | sequence))
 * </group>
 *
 * @xerces.internal
 *
 * @author Rahul Srivastava, Sun Microsystems Inc.
 * @author Elena Litani, IBM
 * @author Lisa Martin,  IBM
 */
class  XSDGroupTraverser extends XSDAbstractParticleTraverser {

    XSDGroupTraverser (XSDHandler handler,
            XSAttributeChecker gAttrCheck) {

        super(handler, gAttrCheck);
    }

    XSParticleDecl traverseLocal(Element elmNode,
            XSDocumentInfo schemaDoc,
            SchemaGrammar grammar) {

        // General Attribute Checking for elmNode declared locally
        Object[] attrValues = fAttrChecker.checkAttributes(elmNode, false,
                schemaDoc);
        QName refAttr = (QName) attrValues[XSAttributeChecker.ATTIDX_REF];
        XInt  minAttr = (XInt)  attrValues[XSAttributeChecker.ATTIDX_MINOCCURS];
        XInt  maxAttr = (XInt)  attrValues[XSAttributeChecker.ATTIDX_MAXOCCURS];

        XSGroupDecl group = null;

        // ref should be here.
        if (refAttr == null) {
            reportSchemaError("s4s-att-must-appear", new Object[]{"group (local)", "ref"}, elmNode);
        } else {
            // get global decl
            // index is a particle index.
            group = (XSGroupDecl)fSchemaHandler.getGlobalDecl(schemaDoc, XSDHandler.GROUP_TYPE, refAttr, elmNode);
        }

        // no children other than "annotation?" are allowed
        Element child = DOMUtil.getFirstChildElement(elmNode);
        if (child != null && DOMUtil.getLocalName(child).equals(SchemaSymbols.ELT_ANNOTATION)) {
            // REVISIT:  put this somewhere
            traverseAnnotationDecl(child, attrValues, false, schemaDoc);
            child = DOMUtil.getNextSiblingElement(child);
        }

        if (child != null) {
            reportSchemaError("s4s-elt-must-match.1", new Object[]{"group (local)", "(annotation?)", DOMUtil.getLocalName(elmNode)}, elmNode);
        }

        int minOccurs = minAttr.intValue();
        int maxOccurs = maxAttr.intValue();

        XSParticleDecl particle = null;

        // not empty group, not empty particle
        if (group != null && group.fModelGroup != null &&
                !(minOccurs == 0 && maxOccurs == 0)) {
            // create a particle to contain this model group
            if (fSchemaHandler.fDeclPool != null) {
                particle = fSchemaHandler.fDeclPool.getParticleDecl();
            } else {
                particle = new XSParticleDecl();
            }
            particle.fType = XSParticleDecl.PARTICLE_MODELGROUP;
            particle.fValue = group.fModelGroup;
            particle.fMinOccurs = minOccurs;
            particle.fMaxOccurs = maxOccurs;
        }

        fAttrChecker.returnAttrArray(attrValues, schemaDoc);

        return particle;

    } // traverseLocal

    XSGroupDecl traverseGlobal(Element elmNode,
            XSDocumentInfo schemaDoc,
            SchemaGrammar grammar) {

        // General Attribute Checking for elmNode declared globally
        Object[] attrValues = fAttrChecker.checkAttributes(elmNode, true,
                schemaDoc);
        String  strNameAttr = (String)  attrValues[XSAttributeChecker.ATTIDX_NAME];

        // must have a name
        if (strNameAttr == null) {
            reportSchemaError("s4s-att-must-appear", new Object[]{"group (global)", "name"}, elmNode);
        }

        XSGroupDecl group = null;
        XSParticleDecl particle = null;

        // must have at least one child
        Element l_elmChild = DOMUtil.getFirstChildElement(elmNode);
        XSAnnotationImpl annotation = null;
        if (l_elmChild == null) {
            reportSchemaError("s4s-elt-must-match.2",
                    new Object[]{"group (global)", "(annotation?, (all | choice | sequence))"},
                    elmNode);
        } else {
            // Create the group defi up-front, so it can be passed
            // to the traversal methods
            group = new XSGroupDecl();

            String childName = l_elmChild.getLocalName();
            if (childName.equals(SchemaSymbols.ELT_ANNOTATION)) {
                annotation = traverseAnnotationDecl(l_elmChild, attrValues, true, schemaDoc);
                l_elmChild = DOMUtil.getNextSiblingElement(l_elmChild);
                if (l_elmChild != null)
                    childName = l_elmChild.getLocalName();
            }
            else {
                String text = DOMUtil.getSyntheticAnnotation(elmNode);
                if (text != null) {
                    annotation = traverseSyntheticAnnotation(elmNode, text, attrValues, false, schemaDoc);
                }
            }

            if (l_elmChild == null) {
                reportSchemaError("s4s-elt-must-match.2",
                        new Object[]{"group (global)", "(annotation?, (all | choice | sequence))"},
                        elmNode);
            } else if (childName.equals(SchemaSymbols.ELT_ALL)) {
                particle = traverseAll(l_elmChild, schemaDoc, grammar, CHILD_OF_GROUP, group);
            } else if (childName.equals(SchemaSymbols.ELT_CHOICE)) {
                particle = traverseChoice(l_elmChild, schemaDoc, grammar, CHILD_OF_GROUP, group);
            } else if (childName.equals(SchemaSymbols.ELT_SEQUENCE)) {
                particle = traverseSequence(l_elmChild, schemaDoc, grammar, CHILD_OF_GROUP, group);
            } else {
                reportSchemaError("s4s-elt-must-match.1",
                        new Object[]{"group (global)", "(annotation?, (all | choice | sequence))", DOMUtil.getLocalName(l_elmChild)},
                        l_elmChild);
            }

            if (l_elmChild != null &&
                    DOMUtil.getNextSiblingElement(l_elmChild) != null) {
                reportSchemaError("s4s-elt-must-match.1",
                        new Object[]{"group (global)", "(annotation?, (all | choice | sequence))",
                        DOMUtil.getLocalName(DOMUtil.getNextSiblingElement(l_elmChild))},
                        DOMUtil.getNextSiblingElement(l_elmChild));
            }

            // add global group declaration to the grammar
            if (strNameAttr != null) {
                group.fName = strNameAttr;
                group.fTargetNamespace = schemaDoc.fTargetNamespace;
                if (particle != null)
                    group.fModelGroup = (XSModelGroupImpl)particle.fValue;
                group.fAnnotation = annotation;
                grammar.addGlobalGroupDecl(group);
            }
            else {
                // name attribute is not there, don't return this group.
                group = null;
            }
        }
        if(group != null) {
            // store groups redefined by restriction in the grammar so
            // that we can get at them at full-schema-checking time.
            Object redefinedGrp = fSchemaHandler.getGrpOrAttrGrpRedefinedByRestriction(XSDHandler.GROUP_TYPE,
                    new QName(XMLSymbols.EMPTY_STRING, strNameAttr, strNameAttr, schemaDoc.fTargetNamespace),
                    schemaDoc, elmNode);
            if(redefinedGrp != null) {
                // store in grammar
                grammar.addRedefinedGroupDecl(group, (XSGroupDecl)redefinedGrp,
                        fSchemaHandler.element2Locator(elmNode));
            }
        }

        fAttrChecker.returnAttrArray(attrValues, schemaDoc);

        return group;

    } // traverseGlobal
}
