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Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family. This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is the reference implementation of XNI but other parser components, configurations, and parsers can be written using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual. Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema 1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that it does not yet provide an option to enable normalization checking as described in section 2.13 of this specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.

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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.dv.XSSimpleType;
import org.apache.xerces.impl.xs.util.XSObjectListImpl;
import org.apache.xerces.xni.QName;
import org.apache.xerces.xs.ShortList;
import org.apache.xerces.xs.XSAnnotation;
import org.apache.xerces.xs.XSAttributeDeclaration;
import org.apache.xerces.xs.XSComplexTypeDefinition;
import org.apache.xerces.xs.XSConstants;
import org.apache.xerces.xs.XSNamespaceItem;
import org.apache.xerces.xs.XSObjectList;
import org.apache.xerces.xs.XSSimpleTypeDefinition;
import org.apache.xerces.xs.XSValue;

/**
 * The XML representation for an attribute declaration
 * schema component is an <attribute> element information item
 * 
 * @xerces.internal 
 *
 * @author Elena Litani, IBM
 * @author Sandy Gao, IBM
 * @version $Id: XSAttributeDecl.java 1024038 2010-10-18 22:06:35Z sandygao $
 */
public class XSAttributeDecl implements XSAttributeDeclaration {

    // scopes
    public final static short     SCOPE_ABSENT        = 0;
    public final static short     SCOPE_GLOBAL        = 1;
    public final static short     SCOPE_LOCAL         = 2;

    // the name of the attribute
    String fName = null;
    // the target namespace of the attribute
    String fTargetNamespace = null;
    // the simple type of the attribute
    XSSimpleType fType = null;
    public QName fUnresolvedTypeName = null;
    // value constraint type: default, fixed or !specified
    short fConstraintType = XSConstants.VC_NONE;
    // scope
    short fScope = XSConstants.SCOPE_ABSENT;
    // enclosing complex type, when the scope is local
    XSComplexTypeDecl fEnclosingCT = null;
    // optional annotations
    XSObjectList fAnnotations = null;    
    // value constraint value
    ValidatedInfo fDefault = null;
    // The namespace schema information item corresponding to the target namespace 
    // of the attribute declaration, if it is globally declared; or null otherwise.
    private XSNamespaceItem fNamespaceItem = null;

    public void setValues(String name, String targetNamespace,
            XSSimpleType simpleType, short constraintType, short scope,
            ValidatedInfo valInfo, XSComplexTypeDecl enclosingCT,
            XSObjectList annotations) {
        fName = name;
        fTargetNamespace = targetNamespace;
        fType = simpleType;
        fConstraintType = constraintType;
        fScope = scope;
        fDefault = valInfo;
        fEnclosingCT = enclosingCT;
        fAnnotations = annotations;
    }

    public void reset(){
        fName = null;
        fTargetNamespace = null;
        fType = null;
        fUnresolvedTypeName = null;
        fConstraintType = XSConstants.VC_NONE;
        fScope = XSConstants.SCOPE_ABSENT;
        fDefault = null;
        fAnnotations = null;
    }

    /**
     * Get the type of the object, i.e ELEMENT_DECLARATION.
     */
    public short getType() {
        return XSConstants.ATTRIBUTE_DECLARATION;
    }

    /**
     * The name 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;
    }

    /**
     * A simple type definition
     */
    public XSSimpleTypeDefinition getTypeDefinition() {
        return fType;
    }

    /**
     * Optional. Either global or a complex type definition (
     * ctDefinition). This property is absent in the case of
     * declarations within attribute group definitions: their scope will be
     * determined when they are used in the construction of complex type
     * definitions.
     */
    public short getScope() {
        return fScope;
    }

    /**
     * Locally scoped declarations are available for use only within the
     * complex type definition identified by the scope
     * property.
     */
    public XSComplexTypeDefinition getEnclosingCTDefinition() {
        return fEnclosingCT;
    }

    /**
     * Value constraint: one of default, fixed.
     */
    public short getConstraintType() {
        return fConstraintType;
    }

    /**
     * Value constraint: The actual value (with respect to the {type
     * definition}) Should we return Object instead of DOMString?
     */
    public String getConstraintValue() {
        // REVISIT: SCAPI: what's the proper representation
        return getConstraintType() == XSConstants.VC_NONE ?
               null :
               fDefault.stringValue();
    }

    /**
     * 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;
    }
    
    public ValidatedInfo getValInfo() {
        return fDefault;
    }
    
    /**
     * @see org.apache.xerces.xs.XSObject#getNamespaceItem()
     */
    public XSNamespaceItem getNamespaceItem() {
        return fNamespaceItem;
    }

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

    public Object getActualVC() {
        return getConstraintType() == XSConstants.VC_NONE ?
               null :
               fDefault.actualValue;
    }

    public short getActualVCType() {
        return getConstraintType() == XSConstants.VC_NONE ?
               XSConstants.UNAVAILABLE_DT :
               fDefault.actualValueType;
    }

    public ShortList getItemValueTypes() {
        return getConstraintType() == XSConstants.VC_NONE ?
               null :
               fDefault.itemValueTypes;
    }

    public XSValue getValueConstraintValue() {
        return fDefault;
    }

} // class XSAttributeDecl