/*
 * The contents of this file are subject to the terms
 * of the Common Development and Distribution License
 * (the "License").  You may not use this file except
 * in compliance with the License.
 * 
 * You can obtain a copy of the license at
 * https://jwsdp.dev.java.net/CDDLv1.0.html
 * See the License for the specific language governing
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL
 * HEADER in each file and include the License file at
 * https://jwsdp.dev.java.net/CDDLv1.0.html  If applicable,
 * add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your
 * own identifying information: Portions Copyright [yyyy]
 * [name of copyright owner]
 */
package com.sun.xml.xsom;

import com.sun.xml.xsom.visitor.XSSimpleTypeFunction;
import com.sun.xml.xsom.visitor.XSSimpleTypeVisitor;

/**
 * Simple type.
 * 
 * @author
 *  Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 */
public interface XSSimpleType extends XSType, XSContentType
{
    /**
     * Gets the base type as XSSimpleType.
     * 
     * Equivalent to
     * <code>
     * (XSSimpleType)getBaseType()
     * </code>
     * Since this is a simple type, we know that the base type
     * is also a simple type.
     *
     * The only exception is xs:anySimpleType, which has xs:anyType
     * as the base type.
     *
     * @return
     *      null if this is xs:anySimpleType. Otherwise non-null.
     */
    XSSimpleType getSimpleBaseType();
    
    /**
     * Gets the variety of this simple type.
     */
    XSVariety getVariety();

    /**
     * Gets the ancestor primitive {@link XSSimpleType} if
     * this type is {@link XSVariety#ATOMIC atomic}.
     *
     * @return
     *      null otherwise.
     */
    XSSimpleType getPrimitiveType();

    /**
     * Returns true if this is a primitive built-in simple type
     * (that directly derives from xs:anySimpleType, by definition.)
     */
    boolean isPrimitive();

    /**
     * Gets the nearest ancestor {@link XSListSimpleType} (including itself)
     * if the variety of this type is {@link XSVariety#LIST list}.
     *
     * @return otherwise return null
     */
    XSListSimpleType getBaseListType();

    /**
     * Gets the nearest ancestor {@link XSUnionSimpleType} (including itself)
     * if the variety of this type is {@link XSVariety#UNION union}.
     *
     * @return otherwise return null
     */
    XSUnionSimpleType getBaseUnionType();

    /**
     * Returns true if this type definition is marked as 'final'
     * with respect to the given {@link XSVariety}.
     *
     * @return
     *      true if the type is marked final.
     */
    boolean isFinal(XSVariety v);
    
    /**
     * If this {@link XSSimpleType} is redefined by another simple type,
     * return that component.
     *
     * @return null
     *      if this component has not been redefined.
     */
    public XSSimpleType getRedefinedBy();

    /**
     * Gets the effective facet object of the given name.
     * 
     * <p>
     * For example, if a simple type "foo" is derived from
     * xs:string by restriction with the "maxLength" facet and
     * another simple type "bar" is derived from "foo" by
     * restriction with another "maxLength" facet, this method
     * will return the latter one, because that is the most
     * restrictive, effective facet.
     * 
     * <p>
     * For those facets that can have multiple values
     * (pattern facets and enumeration facets), this method
     * will return only the first one.
     * TODO: allow clients to access all of them by some means.
     * 
     * @return
     *      If this datatype has a facet of the given name,
     *      return that object. If the facet is not specified
     *      anywhere in its derivation chain, null will be returned.
     */
    XSFacet getFacet( String name );
    
    
    
    void visit( XSSimpleTypeVisitor visitor );
    <T> T apply( XSSimpleTypeFunction<T> function );
    
    /** Returns true if <code>this instanceof XSRestrictionSimpleType</code>. */
    boolean isRestriction();
    /** Returns true if <code>this instanceof XSListSimpleType</code>. */
    boolean isList();
    /** Returns true if <code>this instanceof XSUnionSimpleType</code>. */
    boolean isUnion();
    
    XSRestrictionSimpleType asRestriction();
    XSListSimpleType asList();
    XSUnionSimpleType asUnion();
}