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/*
 * Copyright (c) 1997, 2021 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.xml.bind;

import java.util.concurrent.Callable;

import javax.xml.bind.Unmarshaller;
import javax.xml.bind.ValidationEventHandler;
import javax.xml.bind.annotation.XmlIDREF;

import org.xml.sax.SAXException;

/**
 * Pluggable ID/IDREF handling layer.
 *
 * 

* THIS INTERFACE IS SUBJECT TO CHANGE WITHOUT NOTICE. * *

* This 'interface' can be implemented by applications and specified to * {@link Unmarshaller#setProperty(String, Object)} to ovierride the ID/IDREF * processing of the JAXB RI like this: * *

 * unmarshaller.setProperty(IDResolver.class.getName(),new MyIDResolverImpl());
 * 
* *

Error Handling

*

* This component runs inside the JAXB RI unmarshaller. Therefore, it needs * to coordinate with the JAXB RI unmarshaller when it comes to reporting * errors. This makes sure that applications see consistent error handling behaviors. * *

* When the {@link #startDocument(ValidationEventHandler)} method is invoked, * the unmarshaller passes in a {@link ValidationEventHandler} that can be used * by this component to report any errors encountered during the ID/IDREF processing. * *

* When an error is detected, the error should be first reported to this * {@link ValidationEventHandler}. If the error is fatal or the event handler * decided to abort, the implementation should throw a {@link SAXException}. * This signals the unmarshaller to abort the processing. * * @author Kohsuke Kawaguchi * @since JAXB 2.0 beta */ public abstract class IDResolver { /** * Called when the unmarshalling starts. * *

* Since one {@link Unmarshaller} may be used multiple times * to unmarshal documents, one {@link IDResolver} may be used multiple times, too. * * @param eventHandler * Any errors found during the unmarshalling should be reported to this object. */ public void startDocument(ValidationEventHandler eventHandler) throws SAXException { } /** * Called after the unmarshalling completes. * *

* This is a good opporunity to reset any internal state of this object, * so that it doesn't keep references to other objects unnecessarily. */ public void endDocument() throws SAXException { } /** * Binds the given object to the specified ID. * *

* While a document is being unmarshalled, every time * an ID value is found, this method is invoked to * remember the association between ID and objects. * This association is supposed to be used later to resolve * IDREFs. * *

* This method is invoked right away as soon as a new ID value is found. * * @param id * The ID value found in the document being unmarshalled. * Always non-null. * @param obj * The object being unmarshalled which is going to own the ID. * Always non-null. */ public abstract void bind( String id, Object obj ) throws SAXException; /** * Obtains the object to be pointed by the IDREF value. * *

* While a document is being unmarshalled, every time * an IDREF value is found, this method is invoked immediately to * obtain the object that the IDREF is pointing to. * *

* This method returns a {@link Callable} to support forward-references. * When this method returns with a non-null return value, * the JAXB RI unmarshaller invokes the {@link Callable#call()} method immediately. * If the implementation can find the target object (in which case * it was a backward reference), then a non-null object shall be returned, * and it is used as the target object. * *

* When a forward-reference happens, the {@code call} method * should return null. In this case the JAXB RI unmarshaller invokes * the {@code call} method again after all the documents are fully unmarshalled. * If the {@code call} method still returns null, then the JAXB RI unmarshaller * treats it as an error. * *

* A {@link Callable} object returned from this method may not throw * any exception other than a {@link SAXException} (which means a fatal error.) * * @param id * The IDREF value found in the document being unmarshalled. * Always non-null. * @param targetType * The expected type to which ID resolves to. JAXB infers this * information from the signature of the fields that has {@link XmlIDREF}. * When a property is a collection, this parameter will be the type * of the individual item in the collection. * @return * null if the implementation is sure that the parameter combination * will never yield a valid object. Otherwise non-null. */ public abstract Callable resolve( String id, Class targetType ) throws SAXException; }





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