javax.xml.bind.Binder Maven / Gradle / Ivy
/*
* Copyright (c) 2005, 2018 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 javax.xml.bind;
import org.w3c.dom.Node;
import javax.xml.validation.Schema;
/**
* Enable synchronization between XML infoset nodes and JAXB objects
* representing same XML document.
*
*
* An instance of this class maintains the association between XML nodes of
* an infoset preserving view and a JAXB representation of an XML document.
* Navigation between the two views is provided by the methods
* {@link #getXMLNode(Object)} and {@link #getJAXBNode(Object)}.
*
*
* Modifications can be made to either the infoset preserving view or the
* JAXB representation of the document while the other view remains
* unmodified. The binder is able to synchronize the changes made in the
* modified view back into the other view using the appropriate
* Binder update methods, {@link #updateXML(Object, Object)} or
* {@link #updateJAXB(Object)}.
*
*
* A typical usage scenario is the following:
*
* - load XML document into an XML infoset representation
* - {@link #unmarshal(Object)} XML infoset view to JAXB view.
* (Note to conserve resources, it is possible to only unmarshal a
* subtree of the XML infoset view to the JAXB view.)
* - application access/updates JAXB view of XML document.
* - {@link #updateXML(Object)} synchronizes modifications to JAXB view
* back into the XML infoset view. Update operation preserves as
* much of original XML infoset as possible (i.e. comments, PI, ...)
*
*
*
* A Binder instance is created using the factory method
* {@link JAXBContext#createBinder()} or {@link JAXBContext#createBinder(Class)}.
*
*
* The template parameter, XmlNode, is the
* root interface/class for the XML infoset preserving representation.
* A Binder implementation is required to minimally support
* an XmlNode value of org.w3c.dom.Node.class.
* A Binder implementation can support alternative XML infoset
* preserving representations.
*
* @author
* Kohsuke Kawaguchi ([email protected])
* Joseph Fialli
*
* @since 1.6, JAXB 2.0
*/
public abstract class Binder {
/**
* Unmarshal XML infoset view to a JAXB object tree.
*
*
* This method is similar to {@link Unmarshaller#unmarshal(Node)}
* with the addition of maintaining the association between XML nodes
* and the produced JAXB objects, enabling future update operations,
* {@link #updateXML(Object, Object)} or {@link #updateJAXB(Object)}.
*
*
* When {@link #getSchema()} is non-null, xmlNode
* and its descendants is validated during this operation.
*
*
* This method throws {@link UnmarshalException} when the Binder's
* {@link JAXBContext} does not have a mapping for the XML element name
* or the type, specifiable via {@code @xsi:type}, of {@code xmlNode}
* to a JAXB mapped class. The method {@link #unmarshal(Object, Class)}
* enables an application to specify the JAXB mapped class that
* the {@code xmlNode} should be mapped to.
*
* @param xmlNode
* the document/element to unmarshal XML data from.
*
* @return
* the newly created root object of the JAXB object tree.
*
* @throws JAXBException
* If any unexpected errors occur while unmarshalling
* @throws UnmarshalException
* If the {@link ValidationEventHandler ValidationEventHandler}
* returns false from its {@code handleEvent} method or the
* {@code Binder} is unable to perform the XML to Java
* binding.
* @throws IllegalArgumentException
* If the node parameter is null
*/
public abstract Object unmarshal( XmlNode xmlNode ) throws JAXBException;
/**
* Unmarshal XML root element by provided {@code declaredType}
* to a JAXB object tree.
*
*
* Implements Unmarshal by Declared Type
*
*
* This method is similar to {@link Unmarshaller#unmarshal(Node, Class)}
* with the addition of maintaining the association between XML nodes
* and the produced JAXB objects, enabling future update operations,
* {@link #updateXML(Object, Object)} or {@link #updateJAXB(Object)}.
*
*
* When {@link #getSchema()} is non-null, xmlNode
* and its descendants is validated during this operation.
*
* @param xmlNode
* the document/element to unmarshal XML data from.
* @param declaredType
* appropriate JAXB mapped class to hold {@code node}'s XML data.
*
* @return
* JAXB Element representation
* of {@code node}
*
* @throws JAXBException
* If any unexpected errors occur while unmarshalling
* @throws UnmarshalException
* If the {@link ValidationEventHandler ValidationEventHandler}
* returns false from its {@code handleEvent} method or the
* {@code Binder} is unable to perform the XML to Java
* binding.
* @throws IllegalArgumentException
* If any of the input parameters are null
* @since 1.6, JAXB 2.0
*/
public abstract JAXBElement
unmarshal( XmlNode xmlNode, Class declaredType )
throws JAXBException;
/**
* Marshal a JAXB object tree to a new XML document.
*
*
* This method is similar to {@link Marshaller#marshal(Object, Node)}
* with the addition of maintaining the association between JAXB objects
* and the produced XML nodes,
* enabling future update operations such as
* {@link #updateXML(Object, Object)} or {@link #updateJAXB(Object)}.
*
*
* When {@link #getSchema()} is non-null, the marshalled
* xml content is validated during this operation.
*
* @param jaxbObject
* The content tree to be marshalled.
* @param xmlNode
* The parameter must be a Node that accepts children.
*
* @throws JAXBException
* If any unexpected problem occurs during the marshalling.
* @throws MarshalException
* If the {@link ValidationEventHandler ValidationEventHandler}
* returns false from its {@code handleEvent} method or the
* {@code Binder} is unable to marshal {@code jaxbObject} (or any
* object reachable from {@code jaxbObject}).
*
* @throws IllegalArgumentException
* If any of the method parameters are null
*/
public abstract void marshal( Object jaxbObject, XmlNode xmlNode ) throws JAXBException;
/**
* Gets the XML element associated with the given JAXB object.
*
*
* Once a JAXB object tree is associated with an XML fragment,
* this method enables navigation between the two trees.
*
*
* An association between an XML element and a JAXB object is
* established by the bind methods and the update methods.
* Note that this association is partial; not all XML elements
* have associated JAXB objects, and not all JAXB objects have
* associated XML elements.
*
* @param jaxbObject An instance that is reachable from a prior
* call to a bind or update method that returned
* a JAXB object tree.
*
* @return
* null if the specified JAXB object is not known to this
* {@link Binder}, or if it is not associated with an
* XML element.
*
* @throws IllegalArgumentException
* If the jaxbObject parameter is null
*/
public abstract XmlNode getXMLNode( Object jaxbObject );
/**
* Gets the JAXB object associated with the given XML element.
*
*
* Once a JAXB object tree is associated with an XML fragment,
* this method enables navigation between the two trees.
*
*
* An association between an XML element and a JAXB object is
* established by the unmarshal, marshal and update methods.
* Note that this association is partial; not all XML elements
* have associated JAXB objects, and not all JAXB objects have
* associated XML elements.
*
* @return
* null if the specified XML node is not known to this
* {@link Binder}, or if it is not associated with a
* JAXB object.
*
* @throws IllegalArgumentException
* If the node parameter is null
*/
public abstract Object getJAXBNode( XmlNode xmlNode );
/**
* Takes an JAXB object and updates
* its associated XML node and its descendants.
*
*
* This is a convenience method of:
*
* updateXML( jaxbObject, getXMLNode(jaxbObject));
*
*
* @throws JAXBException
* If any unexpected problem occurs updating corresponding XML content.
* @throws IllegalArgumentException
* If the jaxbObject parameter is null
*/
public abstract XmlNode updateXML( Object jaxbObject ) throws JAXBException;
/**
* Changes in JAXB object tree are updated in its associated XML parse tree.
*
*
* This operation can be thought of as an "in-place" marshalling.
* The difference is that instead of creating a whole new XML tree,
* this operation updates an existing tree while trying to preserve
* the XML as much as possible.
*
*
* For example, unknown elements/attributes in XML that were not bound
* to JAXB will be left untouched (whereas a marshalling operation
* would create a new tree that doesn't contain any of those.)
*
*
* As a side-effect, this operation updates the association between
* XML nodes and JAXB objects.
*
* @param jaxbObject root of potentially modified JAXB object tree
* @param xmlNode root of update target XML parse tree
*
* @return
* Returns the updated XML node. Typically, this is the same
* node you passed in as xmlNode, but it maybe
* a different object, for example when the tag name of the object
* has changed.
*
* @throws JAXBException
* If any unexpected problem occurs updating corresponding XML content.
* @throws IllegalArgumentException
* If any of the input parameters are null
*/
public abstract XmlNode updateXML( Object jaxbObject, XmlNode xmlNode ) throws JAXBException;
/**
* Takes an XML node and updates its associated JAXB object and its descendants.
*
*
* This operation can be thought of as an "in-place" unmarshalling.
* The difference is that instead of creating a whole new JAXB tree,
* this operation updates an existing tree, reusing as much JAXB objects
* as possible.
*
*
* As a side-effect, this operation updates the association between
* XML nodes and JAXB objects.
*
* @return
* Returns the updated JAXB object. Typically, this is the same
* object that was returned from earlier
* {@link #marshal(Object,Object)} or
* {@link #updateJAXB(Object)} method invocation,
* but it maybe
* a different object, for example when the name of the XML
* element has changed.
*
* @throws JAXBException
* If any unexpected problem occurs updating corresponding JAXB mapped content.
* @throws IllegalArgumentException
* If node parameter is null
*/
public abstract Object updateJAXB( XmlNode xmlNode ) throws JAXBException;
/**
* Specifies whether marshal, unmarshal and update methods
* performs validation on their XML content.
*
* @param schema set to null to disable validation.
*
* @see Unmarshaller#setSchema(Schema)
*/
public abstract void setSchema( Schema schema );
/**
* Gets the last {@link Schema} object (including null) set by the
* {@link #setSchema(Schema)} method.
*
* @return the Schema object for validation or null if not present
*/
public abstract Schema getSchema();
/**
* Allow an application to register a {@code ValidationEventHandler}.
*
* The {@code ValidationEventHandler} will be called by the JAXB Provider
* if any validation errors are encountered during calls to any of the
* Binder unmarshal, marshal and update methods.
*
*
* Calling this method with a null parameter will cause the Binder
* to revert back to the default default event handler.
*
* @param handler the validation event handler
* @throws JAXBException if an error was encountered while setting the
* event handler
*/
public abstract void setEventHandler( ValidationEventHandler handler ) throws JAXBException;
/**
* Return the current event handler or the default event handler if one
* hasn't been set.
*
* @return the current ValidationEventHandler or the default event handler
* if it hasn't been set
* @throws JAXBException if an error was encountered while getting the
* current event handler
*/
public abstract ValidationEventHandler getEventHandler() throws JAXBException;
/**
*
* Set the particular property in the underlying implementation of
* {@code Binder}. This method can only be used to set one of
* the standard JAXB defined unmarshal/marshal properties
* or a provider specific property for binder, unmarshal or marshal.
* Attempting to set an undefined property will result in
* a PropertyException being thrown. See
* Supported Unmarshal Properties
* and
* Supported Marshal Properties.
*
* @param name the name of the property to be set. This value can either
* be specified using one of the constant fields or a user
* supplied string.
* @param value the value of the property to be set
*
* @throws PropertyException when there is an error processing the given
* property or value
* @throws IllegalArgumentException
* If the name parameter is null
*/
abstract public void setProperty( String name, Object value ) throws PropertyException;
/**
* Get the particular property in the underlying implementation of
* {@code Binder}. This method can only
* be used to get one of
* the standard JAXB defined unmarshal/marshal properties
* or a provider specific property for binder, unmarshal or marshal.
* Attempting to get an undefined property will result in
* a PropertyException being thrown. See
* Supported Unmarshal Properties
* and
* Supported Marshal Properties.
*
* @param name the name of the property to retrieve
* @return the value of the requested property
*
* @throws PropertyException
* when there is an error retrieving the given property or value
* property name
* @throws IllegalArgumentException
* If the name parameter is null
*/
abstract public Object getProperty( String name ) throws PropertyException;
}