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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

package org.apache.xerces.impl.xs;

import org.apache.xerces.impl.dv.ValidatedInfo;
import org.apache.xerces.impl.xs.util.XSObjectListImpl;
import org.apache.xerces.xs.XSAnnotation;
import org.apache.xerces.xs.XSAttributeGroupDefinition;
import org.apache.xerces.xs.XSAttributeUse;
import org.apache.xerces.xs.XSConstants;
import org.apache.xerces.xs.XSNamespaceItem;
import org.apache.xerces.xs.XSObjectList;
import org.apache.xerces.xs.XSWildcard;

/**
 * The XML representation for an attribute group declaration
 * schema component is a global <attributeGroup> element information item
 * 
 * @xerces.internal 
 *
 * @author Sandy Gao, IBM
 * @author Rahul Srivastava, Sun Microsystems Inc.
 *
 * @version $Id: XSAttributeGroupDecl.java 834253 2009-11-09 22:07:23Z sandygao $
 */
public class XSAttributeGroupDecl implements XSAttributeGroupDefinition {

    // name of the attribute group
    public String fName = null;
    // target namespace of the attribute group
    public String fTargetNamespace = null;
    // number of attribute uses included by this attribute group
    int fAttrUseNum = 0;
    // attribute uses included by this attribute group
    private static final int INITIAL_SIZE = 5;
    XSAttributeUseImpl[] fAttributeUses = new XSAttributeUseImpl[INITIAL_SIZE];
    // attribute wildcard included by this attribute group
    public XSWildcardDecl fAttributeWC = null;
    // whether there is an attribute use whose type is or is derived from ID.
    public String fIDAttrName = null;

    // optional annotation
    public XSObjectList fAnnotations;
    
    protected XSObjectListImpl fAttrUses = null;
    
    // The namespace schema information item corresponding to the target namespace 
    // of the attribute group definition, if it is globally declared; or null otherwise.
    private XSNamespaceItem fNamespaceItem = null;

    // add an attribute use
    // if the type is derived from ID, but there is already another attribute
    // use of type ID, then return the name of the other attribute use;
    // otherwise, return null
    public String addAttributeUse(XSAttributeUseImpl attrUse) {

        // if this attribute use is prohibited, then don't check whether it's
        // of type ID
        if (attrUse.fUse != SchemaSymbols.USE_PROHIBITED) {
            if (attrUse.fAttrDecl.fType.isIDType()) {
                // if there is already an attribute use of type ID,
                // return its name (and don't add it to the list, to avoid
                // interruption to instance validation.
                if (fIDAttrName == null)
                    fIDAttrName = attrUse.fAttrDecl.fName;
                else
                    return fIDAttrName;
            }
        }

        if (fAttrUseNum == fAttributeUses.length) {
            fAttributeUses = resize(fAttributeUses, fAttrUseNum*2);
        }
        fAttributeUses[fAttrUseNum++] = attrUse;

        return null;
    }

    public void replaceAttributeUse(XSAttributeUse oldUse, XSAttributeUseImpl newUse) {
        for (int i=0; i 0) {
//            OUTER: for (int i = 0; i < fAttrUseNum; i++) {
//                if (fAttributeUses[i].fUse == SchemaSymbols.USE_PROHIBITED)
//                    continue;
//                for (int j = 1; j <= pCount; j++) {
//                    if (fAttributeUses[i].fAttrDecl.fName == pUses[fAttrUseNum-pCount].fAttrDecl.fName &&
//                        fAttributeUses[i].fAttrDecl.fTargetNamespace == pUses[fAttrUseNum-pCount].fAttrDecl.fTargetNamespace) {
//                        continue OUTER;
//                    }
//                }
//                pUses[newCount++] = fAttributeUses[i];
//            }
//            fAttributeUses = pUses;
//            fAttrUseNum = newCount;
//        }
    }

    /**
     * Check that the attributes in this group validly restrict those from a base group.
     * If an error is found, an Object[] is returned. This contains the arguments for the error message
     * describing the error. The last element in the array (at index arr.length - 1) is the the error code.
     * Returns null if there is no error.
     * 
     * REVISIT: is there a better way of returning the appropriate information for the error?
     * 
     * @param typeName the name of the type containing this attribute group, used for error reporting purposes
     * @param baseGroup the XSAttributeGroupDecl that is the base we are checking against
     */
    public Object[] validRestrictionOf(String typeName, XSAttributeGroupDecl baseGroup) {

        Object[] errorArgs = null;
        XSAttributeUseImpl attrUse = null;
        XSAttributeDecl attrDecl = null;
        XSAttributeUseImpl baseAttrUse = null;
        XSAttributeDecl baseAttrDecl = null;

        for (int i=0; iname of this XSObject depending on the
     * XSObject type.
     */
    public String getName() {
        return fName;
    }

    /**
     * The namespace URI of this node, or null if it is
     * unspecified.  defines how a namespace URI is attached to schema
     * components.
     */
    public String getNamespace() {
        return fTargetNamespace;
    }

    /**
     * {attribute uses} A set of attribute uses.
     */
    public XSObjectList getAttributeUses() {
        if (fAttrUses == null){
            fAttrUses = new XSObjectListImpl(fAttributeUses, fAttrUseNum);
        }
        return fAttrUses;
    }

    /**
     * {attribute wildcard} Optional. A wildcard.
     */
    public XSWildcard getAttributeWildcard() {
        return fAttributeWC;
    }

    /**
     * Optional. Annotation.
     */
    public XSAnnotation getAnnotation() {
        return (fAnnotations != null) ? (XSAnnotation) fAnnotations.item(0) : null;
    }

    /**
     * Optional. Annotations.
     */
    public XSObjectList getAnnotations() {
        return (fAnnotations != null) ? fAnnotations : XSObjectListImpl.EMPTY_LIST;
    }
    
    /**
     * @see org.apache.xerces.xs.XSObject#getNamespaceItem()
     */
    public XSNamespaceItem getNamespaceItem() {
        return fNamespaceItem;
    }

    void setNamespaceItem(XSNamespaceItem namespaceItem) {
        fNamespaceItem = namespaceItem;
    }

} // class XSAttributeGroupDecl