/*
 * 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.
 */

package com.sun.org.apache.xerces.internal.impl.xs;

import com.sun.org.apache.xerces.internal.impl.dv.XSSimpleType;
import com.sun.org.apache.xerces.internal.xs.*;
import com.sun.org.apache.xerces.internal.impl.dv.ValidatedInfo;

/**
 * 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,v 1.2.6.1 2005/09/09 07:30:54 sunithareddy Exp $
 */
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;
    // 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 annotation
    XSAnnotationImpl fAnnotation = null;
    // value constraint value
    ValidatedInfo fDefault = null;

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

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

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

    /**
     * The <code>name</code> of this <code>XSObject</code> depending on the
     * <code>XSObject</code> type.
     */
    public String getName() {
        return fName;
    }

    /**
     * The namespace URI of this node, or <code>null</code> 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 (
     * <code>ctDefinition</code>). 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 <code>scope</code>
     * 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 fAnnotation;
    }
    
    public ValidatedInfo getValInfo() {
        return fDefault;
    }
    /**
     * @see com.sun.org.apache.xerces.internal.xs.XSObject#getNamespaceItem()
     */
    public XSNamespaceItem getNamespaceItem() {
        // REVISIT: implement
        return null;
    }

    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;
    }

} // class XSAttributeDecl