v2/src/binding/org/apache/xmlbeans/impl/binding/bts/BindingType.java

/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2003 The Apache Software Foundation.  All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
*
* 3. The end-user documentation included with the redistribution,
*    if any, must include the following acknowledgment:
*       "This product includes software developed by the
*        Apache Software Foundation (http://www.apache.org/)."
*    Alternately, this acknowledgment may appear in the software itself,
*    if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
*    not be used to endorse or promote products derived from this
*    software without prior written permission. For written
*    permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache
*    XMLBeans", nor may "Apache" appear in their name, without prior
*    written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2003 BEA Systems
* Inc., <http://www.bea.com/>. For more information on the Apache Software
* Foundation, please see <http://www.apache.org/>.
*/
package org.apache.xmlbeans.impl.binding.bts;

import org.apache.xmlbeans.SchemaType;

/**
 * Represents a Java+XML component and a rule for getting between
 * them.
 */
public abstract class BindingType
{
    private final BindingTypeName btName;

    /**
     * This kind of constructor is used when making a new one out of the blue.
     *
     * Subclasses should call super(..) when defining constructors that init new BindingTypes.
     */
    protected BindingType(BindingTypeName btName)
    {
        this.btName = btName;
    }

    /**
     * This constructor loads an instance from an XML file
     *
     * Subclasses should have ctors of the same signature and call super(..) first.
     */
    protected BindingType(org.apache.xmlbeans.x2003.x09.bindingConfig.BindingType node)
    {
        this.btName = BindingTypeName.forPair(
                JavaName.forString(node.getJavatype()),
                XmlName.forString(node.getXmlcomponent()));
    }

    /**
     * This function copies an instance back out to the relevant part of the XML file.
     *
     * Subclasses should override and call super.write first.
     */
    protected org.apache.xmlbeans.x2003.x09.bindingConfig.BindingType write(org.apache.xmlbeans.x2003.x09.bindingConfig.BindingType node)
    {
        node = (org.apache.xmlbeans.x2003.x09.bindingConfig.BindingType)node.changeType(kinds.typeForClass(this.getClass()));
        node.setJavatype(btName.getJavaName().toString());
        node.setXmlcomponent(btName.getXmlName().toString());
        return node;
    }

    public final BindingTypeName getName()
    {
        return btName;
    }

    /* REGISTRY OF SUBCLASSES */

    private static final Class[] ctorArgs = new Class[] {org.apache.xmlbeans.x2003.x09.bindingConfig.BindingType.class};

    public static BindingType loadFromBindingTypeNode(org.apache.xmlbeans.x2003.x09.bindingConfig.BindingType node)
    {
        try
        {
            Class clazz = kinds.classForType(node.schemaType());
            return (BindingType)clazz.getConstructor(ctorArgs).newInstance(new Object[] {node});
        }
        catch (Exception e)
        {
            throw (IllegalStateException)new IllegalStateException("Cannot load class for " + node.schemaType() + ": should be registered.").initCause(e);
        }
    }

    /**
     * Should only be called by BindingFile, when loading up bindingtypes
     */
    static KindRegistry kinds = new KindRegistry();

    public static void registerClassAndType(Class clazz, SchemaType type)
    {
        if (!BindingType.class.isAssignableFrom(clazz))
            throw new IllegalArgumentException("Classes must inherit from BindingType");
        if (!org.apache.xmlbeans.x2003.x09.bindingConfig.BindingType.type.isAssignableFrom(type))
            throw new IllegalArgumentException("Schema types must inherit from binding-type");
        kinds.registerClassAndType(clazz, type);
    }

    static
    {
        registerClassAndType(JaxbBean.class, org.apache.xmlbeans.x2003.x09.bindingConfig.JaxbBean.type);
        registerClassAndType(ByNameBean.class, org.apache.xmlbeans.x2003.x09.bindingConfig.ByNameBean.type);
        registerClassAndType(SimpleBindingType.class, org.apache.xmlbeans.x2003.x09.bindingConfig.SimpleType.type);
        registerClassAndType(SimpleDocumentBinding.class, org.apache.xmlbeans.x2003.x09.bindingConfig.SimpleDocumentBinding.type);
    }

}