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/*
* Copyright (c) 1998, 2019 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.oxm.mappings;
import java.util.Enumeration;
import java.util.Vector;
import org.eclipse.persistence.descriptors.ClassDescriptor;
import org.eclipse.persistence.exceptions.DatabaseException;
import org.eclipse.persistence.exceptions.DescriptorException;
import org.eclipse.persistence.internal.helper.ClassConstants;
import org.eclipse.persistence.internal.helper.DatabaseField;
import org.eclipse.persistence.internal.identitymaps.CacheKey;
import org.eclipse.persistence.internal.oxm.XMLConversionManager;
import org.eclipse.persistence.internal.oxm.mappings.DirectCollectionMapping;
import org.eclipse.persistence.internal.oxm.mappings.XMLContainerMapping;
import org.eclipse.persistence.internal.queries.CollectionContainerPolicy;
import org.eclipse.persistence.internal.queries.ContainerPolicy;
import org.eclipse.persistence.internal.queries.JoinedAttributeManager;
import org.eclipse.persistence.internal.sessions.AbstractRecord;
import org.eclipse.persistence.internal.sessions.AbstractSession;
import org.eclipse.persistence.mappings.AttributeAccessor;
import org.eclipse.persistence.mappings.converters.Converter;
import org.eclipse.persistence.mappings.converters.TypeConversionConverter;
import org.eclipse.persistence.mappings.foundation.AbstractCompositeDirectCollectionMapping;
import org.eclipse.persistence.oxm.XMLConstants;
import org.eclipse.persistence.oxm.XMLField;
import org.eclipse.persistence.oxm.XMLMarshaller;
import org.eclipse.persistence.oxm.XMLUnmarshaller;
import org.eclipse.persistence.oxm.mappings.converters.XMLConverter;
import org.eclipse.persistence.oxm.mappings.nullpolicy.AbstractNullPolicy;
import org.eclipse.persistence.oxm.mappings.nullpolicy.NullPolicy;
import org.eclipse.persistence.oxm.mappings.nullpolicy.XMLNullRepresentationType;
import org.eclipse.persistence.oxm.record.DOMRecord;
import org.eclipse.persistence.oxm.record.XMLRecord;
import org.eclipse.persistence.queries.ObjectBuildingQuery;
import org.eclipse.persistence.sessions.Session;
/**
* Composite direct collection XML mappings map a collection of simple types (String, Number, Date,
* etc.) to and from a sequence of composite XML nodes.
*
*
Composite direct collection XML mappings can be used in the following scenarios:
* - Mapping to Multiple Text Nodes
* - Mapping to Multiple Attributes
* - Mapping to a Single Text Node
* - Mapping to a Single Attribute
* - Mapping to a List of Unions
* - Mapping a Union of Lists
* - Specifying the Content Type of a Collection
*
*
* Setting the XPath: TopLink XML mappings make use of an XPath statement to find the relevant
* data in an XML document. The XPath statement is relative to the context node specified in the descriptor.
* The XPath may contain node type, path, and positional information. The XPath is specified on the
* mapping using the setXPath method.
*
*
The following XPath statements may be used to specify the location of XML data relating to an object's
* name attribute:
*
*
* XPath statements
*
* XPath
* Description
*
*
* @tasks
* The "@" character indicates that the node is an attribute. This XPath applies only to the single
* attribute node case; each member of the collection is mapped to a single node.
*
*
* tasks/@task
* The "@" character indicates that the node is an attribute. The information is stored
* in the attribute node of the tasks element.
*
*
* text()
* "text()" indicates that the node is a text node. In this case the task value in the
* text node belongs to the context node.
*
*
* tasks/text()
* The task information is stored in the text node of the tasks element.
*
*
* tasks/task/text()
* The XPath statement may be used to specify any valid path.
*
*
* task[2]/text()
* The XPath statement may contain positional information. In this case the task
* information is stored in the text node of the second occurrence of the task element.
*
*
*
* Mapping to a Single Text Node: By default, TopLink maps each member of a collection
* to it's own node. It is possible, however, to mapping a collection to a single node; here the contents of
* the node is treated as a space-separated list. This behavior is set on the mapping using the
* setUsesSingleNode method, with 'true' as the parameter.
*
*
*
*
XML Schema
*
* <?xml version="1.0" encoding="UTF-8"?>
* <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
* <xsd:element name="employee" type="employee-type"/>
* <xsd:complexType name="employee-type">
* <xsd:sequence>
* <xsd:element name="tasks" type="tasks-type"/>
* </xsd:sequence>
* </xsd:complexType>
* <xsd:simpleType name="tasks-type">
* <xsd:list itemType="xsd:string"/>
* </xsd:simpleType>
* </xsd:schema>
*
*
*
Code Sample
*
* XMLCompositeDirectCollectionMapping tasksMapping = new XMLCompositeDirectCollectionMapping();
* tasksMapping.setAttributeName("tasks");
* tasksMapping.setXPath("tasks/text()");
* tasksMapping.setUsesSingleNode(true);
*
*
*
Specifying the Content Type of a Collection: By default, TopLink will treat the node values
* read in by a composite direct collection XML mapping as objects of type String. You can override this behavior
* by specifying the type of the collection's contents.
*
*
*
*
XML Schema
*
* <?xml version="1.0" encoding="UTF-8"?>
* <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
* <xsd:element name="employee" type="employee-type"/>
* <xsd:complexType name="employee-type">
* <xsd:sequence>
* <xsd:element name="vacation" type="xsd:string" maxOccurs="unbounded"/>
* </xsd:sequence>
* </xsd:complexType>
* </xsd:schema>
*
*
*
Code Sample
*
* XMLCompositeDirectCollectionMapping tasksMapping = new XMLCompositeDirectCollectionMapping();
* tasksMapping.setAttributeName("vacationDays");
* tasksMapping.setXPath("vacation/text()");
* tasksMapping.setAttributeElementClass(Calendar.class);
*
*
*
Mapping to a List of Unions:
*
*
*
*
XML Schema
*
* <?xml version="1.0" encoding="UTF-8"?>
* <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
* <xsd:element name="vacation" type="listOfUnions"/>
* <xsd:simpleType name="listOfUnions">
* <xsd:list>
* <xsd:simpleType>
* <xsd:union memberTypes="xsd:date xsd:integer"/>
* </xsd:simpleType>
* </xsd:list>
* </xsd:simpleType>
* </xsd:schema>
*
*
*
Code Sample
*
* XMLCompositeDirectCollectionMapping mapping = new XMLCompositeDirectCollectionMapping();
* mapping.setAttributeName("myattribute");
* XMLUnionField field = new XMLUnionField("listOfUnions/text()");
* mapping.addSchemaType(new QName(url,XMLConstants.INT));
* mapping.addSchemaType(new QName(url,XMLConstants.DATE));
* mapping.setField(field);
* mapping.useSingleElement(false);
*
*
*
More Information: For more information about using the XML Composite Direct
* Collection Mapping, see the "Understanding XML Mappings" chapter of the Oracle TopLink
* Developer's Guide.
*
* @since Oracle TopLink 10g Release 2 (10.1.3)
*/
public class XMLCompositeDirectCollectionMapping extends AbstractCompositeDirectCollectionMapping implements DirectCollectionMapping, XMLMapping, XMLNillableMapping {
private boolean isCDATA;
private boolean isDefaultEmptyContainer = XMLContainerMapping.EMPTY_CONTAINER_DEFAULT;
private boolean isWriteOnly;
private AbstractNullPolicy nullPolicy;
protected boolean reuseContainer;
private boolean isCollapsingStringValues;
private boolean isNormalizingStringValues;
private AbstractNullPolicy wrapperNullPolicy;
/** Support specification of the value to use for null. */
protected transient Object nullValue;
public XMLCompositeDirectCollectionMapping() {
super();
this.nullPolicy = new NullPolicy();
this.nullPolicy.setNullRepresentedByEmptyNode(true);
}
/**
* INTERNAL:
*/
@Override
public boolean isXMLMapping() {
return true;
}
/**
* INTERNAL:
* Initialize the mapping.
*/
@Override
public void initialize(AbstractSession session) throws DescriptorException {
super.initialize(session);
if (this.getField() instanceof XMLField) {
if (valueConverter instanceof TypeConversionConverter) {
TypeConversionConverter converter = (TypeConversionConverter) valueConverter;
this.getField().setType(converter.getObjectClass());
}
String xpathString = ((XMLField) getField()).getXPath();
if (this.isAbstractCompositeDirectCollectionMapping() && (xpathString.indexOf(XMLConstants.ATTRIBUTE) == -1) && (!xpathString.endsWith(XMLConstants.TEXT))) {
throw DescriptorException.invalidXpathForXMLDirectMapping(this);
}
}
ContainerPolicy cp = getContainerPolicy();
if (cp != null) {
if (cp.getContainerClass() == null) {
Class cls = session.getDatasourcePlatform().getConversionManager().convertClassNameToClass(cp.getContainerClassName());
cp.setContainerClass(cls);
}
}
((XMLField) this.getField()).setIsCDATA(this.isCDATA());
}
/**
* Set the Mapping field name attribute to the given XPath String
* @param xpathString String
*/
@Override
public void setXPath(String xpathString) {
if ((xpathString.indexOf(XMLConstants.ATTRIBUTE) == -1) && (!xpathString.endsWith(XMLConstants.TEXT))) {
xpathString += '/' + XMLConstants.TEXT;
}
setField(new XMLField(xpathString));
}
/**
* Get the XPath String
* @return String the XPath String associated with this Mapping
*/
public String getXPath() {
return getFieldName();
}
@Override
public void useCollectionClassName(String concreteContainerClassName) {
this.setContainerPolicy(new CollectionContainerPolicy(concreteContainerClassName));
}
/**
* INTERNAL:
* Build the nested collection from the database row.
*/
@Override
public Object valueFromRow(AbstractRecord row, JoinedAttributeManager joinManager, ObjectBuildingQuery sourceQuery, CacheKey cacheKey, AbstractSession executionSession, boolean isTargetProtected, Boolean[] wasCacheUsed) throws DatabaseException {
ContainerPolicy cp = this.getContainerPolicy();
DOMRecord domRecord = (DOMRecord) row;
Object fieldValue = domRecord.getValues(this.getField(), this.getNullPolicy());
if (fieldValue == null) {
if (reuseContainer) {
Object currentObject = ((XMLRecord) row).getCurrentObject();
Object container = getAttributeAccessor().getAttributeValueFromObject(currentObject);
return container != null ? container : cp.containerInstance();
} else {
return cp.containerInstance();
}
}
Vector fieldValues = this.getDescriptor().buildDirectValuesFromFieldValue(fieldValue);
if (fieldValues == null) {
if (reuseContainer) {
Object currentObject = ((XMLRecord) row).getCurrentObject();
Object container = getAttributeAccessor().getAttributeValueFromObject(currentObject);
return container != null ? container : cp.containerInstance();
} else {
return cp.containerInstance();
}
}
Object result = null;
if (reuseContainer) {
Object currentObject = ((XMLRecord) row).getCurrentObject();
Object container = getAttributeAccessor().getAttributeValueFromObject(currentObject);
result = container != null ? container : cp.containerInstance();
} else {
result = cp.containerInstance(fieldValues.size());
}
for (Enumeration stream = fieldValues.elements(); stream.hasMoreElements();) {
Object element = stream.nextElement();
element = convertDataValueToObjectValue(element, executionSession, ((XMLRecord) row).getUnmarshaller());
if (element != null && element.getClass() == ClassConstants.STRING) {
if (isCollapsingStringValues) {
element = XMLConversionManager.getDefaultXMLManager().collapseStringValue((String)element);
} else if(isNormalizingStringValues) {
element = XMLConversionManager.getDefaultXMLManager().normalizeStringValue((String)element);
}
}
cp.addInto(element, result, sourceQuery.getSession());
}
return result;
}
/**
* INTERNAL:
*/
@Override
public void writeFromObjectIntoRow(Object object, AbstractRecord row, AbstractSession session, WriteType writeType) {
if (this.isReadOnly()) {
return;
}
Object attributeValue = this.getAttributeValueFromObject(object);
if (attributeValue == null) {
row.put(this.getField(), null);
return;
}
ContainerPolicy cp = this.getContainerPolicy();
Vector elements = new Vector(cp.sizeFor(attributeValue));
Object iter = cp.iteratorFor(attributeValue);
if (null != iter) {
while (cp.hasNext(iter)) {
Object element = cp.next(iter, session);
element = convertObjectValueToDataValue(element, session, ((XMLRecord) row).getMarshaller());
if (element != null) {
elements.addElement(element);
} else if(!usesSingleNode()){
AbstractNullPolicy nullPolicy = getNullPolicy();
if (nullPolicy == null) {
elements.addElement(null);
} else {
if (nullPolicy.getMarshalNullRepresentation() == XMLNullRepresentationType.XSI_NIL) {
elements.addElement(XMLRecord.NIL);
} else if (nullPolicy.getMarshalNullRepresentation() == XMLNullRepresentationType.ABSENT_NODE) {
// Do nothing
} else {
elements.addElement(XMLConstants.EMPTY_STRING);
}
}
}
}
}
Object fieldValue = null;
if (!elements.isEmpty()) {
fieldValue = this.getDescriptor().buildFieldValueFromDirectValues(elements, elementDataTypeName, session);
}
row.put(this.getField(), fieldValue);
}
@Override
public void writeSingleValue(Object value, Object parent, XMLRecord record, AbstractSession session) {
Object element = convertObjectValueToDataValue(value, session, record.getMarshaller());
record.add(this.getField(), element);
}
@Override
public void setIsCDATA(boolean CDATA) {
isCDATA = CDATA;
}
@Override
public boolean isCDATA() {
return isCDATA;
}
@Override
public void setIsWriteOnly(boolean b) {
this.isWriteOnly = b;
}
@Override
public boolean isWriteOnly() {
return isWriteOnly;
}
@Override
public void setAttributeValueInObject(Object object, Object value) throws DescriptorException {
if (isWriteOnly()) {
return;
}
super.setAttributeValueInObject(object, value);
}
@Override
public void preInitialize(AbstractSession session) throws DescriptorException {
getAttributeAccessor().setIsWriteOnly(this.isWriteOnly());
getAttributeAccessor().setIsReadOnly(this.isReadOnly());
super.preInitialize(session);
}
@Override
public AbstractNullPolicy getNullPolicy() {
return this.nullPolicy;
}
@Override
public void setNullPolicy(AbstractNullPolicy value) {
this.nullPolicy = value;
}
/**
* Return true if the original container on the object should be used if
* present. If it is not present then the container policy will be used to
* create the container.
*/
@Override
public boolean getReuseContainer() {
return reuseContainer;
}
/**
* Specify whether the original container on the object should be used if
* present. If it is not present then the container policy will be used to
* create the container.
*/
@Override
public void setReuseContainer(boolean reuseContainer) {
this.reuseContainer = reuseContainer;
}
/**
* PUBLIC:
* Returns true if this mapping is normalizing string values on unmarshal before adding
* them to the collection. Normalize replaces any CR, LF or Tab characters with a
* single space character.
*/
@Override
public boolean isNormalizingStringValues() {
return this.isNormalizingStringValues;
}
/**
* PUBLIC:
* Indicates that this mapping should normalize all string values before adding them
* to the collection on unmarshal. Normalize replaces any CR, LF or Tab characters with a
* single space character.
* @param normalize
*/
@Override
public void setNormalizingStringValues(boolean normalize) {
this.isNormalizingStringValues = normalize;
}
/**
* PUBLIC:
* Indicates that this mapping should collapse all string values before adding them
* to the collection on unmarshal. Collapse removes leading and trailing whitespaces, and replaces
* any sequence of whitespace characters with a single space.
* @param collapse
*/
@Override
public void setCollapsingStringValues(boolean collapse) {
this.isCollapsingStringValues = collapse;
}
/**
* PUBLIC:
* Returns true if this mapping should collapse all string values before adding them
* to the collection. Collapse removes leading and trailing whitespaces, and replaces
* any sequence of whitespace characters with a single space.
*/
@Override
public boolean isCollapsingStringValues() {
return this.isCollapsingStringValues;
}
/**
* INTERNAL
* Return true if an empty container should be set on the object if there
* is no presence of the collection in the XML document.
* @since EclipseLink 2.3.3
*/
@Override
public boolean isDefaultEmptyContainer() {
return isDefaultEmptyContainer;
}
/**
* INTERNAL
* Indicate whether by default an empty container should be set on the
* field/property if the collection is not present in the XML document.
* @since EclipseLink 2.3.3
*/
@Override
public void setDefaultEmptyContainer(boolean defaultEmptyContainer) {
this.isDefaultEmptyContainer = defaultEmptyContainer;
}
@Override
public AbstractNullPolicy getWrapperNullPolicy() {
return this.wrapperNullPolicy;
}
@Override
public void setWrapperNullPolicy(AbstractNullPolicy policy) {
this.wrapperNullPolicy = policy;
}
/**
* INTERNAL
* @since EclipseLink 2.5.0
*/
@Override
public Object convertObjectValueToDataValue(Object value, Session session, XMLMarshaller marshaller) {
if (hasValueConverter()) {
if (valueConverter instanceof XMLConverter) {
return ((XMLConverter)valueConverter).convertObjectValueToDataValue(value, session, marshaller);
} else {
return valueConverter.convertObjectValueToDataValue(value, session);
}
}
return value;
}
/**
* INTERNAL
* @since EclipseLink 2.5.0
*/
@Override
public Object convertDataValueToObjectValue(Object value, Session session, XMLUnmarshaller unmarshaller) {
if (hasValueConverter()) {
if (valueConverter instanceof XMLConverter) {
return ((XMLConverter)valueConverter).convertDataValueToObjectValue(value, session, unmarshaller);
} else {
return valueConverter.convertDataValueToObjectValue(value, session);
}
}
return value;
}
/**
* PUBLIC:
* Allow for the value used for null to be specified.
* This can be used to convert database null values to application specific values, when null values
* are not allowed by the application (such as in primitives).
* Note: the default value for NULL is used on reads, writes, and query SQL generation
*/
@Override
public Object getNullValue() {
return nullValue;
}
/**
* PUBLIC:
* Allow for the value used for null to be specified.
* This can be used to convert database null values to application specific values, when null values
* are not allowed by the application (such as in primitives).
* Note: the default value for NULL is used on reads
*/
@Override
public void setNullValue(Object nullValue) {
this.nullValue = nullValue;
}
}