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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* // Copyright (c) 1998, 2007, Oracle. All rights reserved.
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*
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* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
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*
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package oracle.toplink.essentials.internal.ejb.cmp3.xml;
import java.io.InputStream;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import oracle.toplink.essentials.exceptions.XMLParseException;
import oracle.toplink.essentials.exceptions.ValidationException;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataConstants;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataHelper;
import oracle.toplink.essentials.internal.ejb.cmp3.metadata.MetadataLogger;
import oracle.toplink.essentials.internal.ejb.cmp3.xml.parser.XPathEngine;
import oracle.toplink.essentials.internal.ejb.cmp3.xml.parser.XMLException;
import oracle.toplink.essentials.internal.ejb.cmp3.xml.parser.XMLExceptionHandler;
/**
* Utility class used for handling element inspection.
*
* @author Guy Pelletier
* @since TopLink EJB 3.0 Reference Implementation
*/
public class XMLHelper {
private Document m_document;
private ClassLoader m_loader;
private String m_documentName;
private String m_defaultPackage;
private XPathEngine m_xPathEngine;
/**
* INTERNAL:
*/
protected XMLHelper(Document document, ClassLoader loader) {
m_xPathEngine = XPathEngine.getInstance();
m_loader = loader;
m_document = document;
Node node = getNode(document, new String[] {XMLConstants.ENTITY_MAPPINGS, XMLConstants.PACKAGE, XMLConstants.TEXT});
if (node != null && node.getNodeValue() != null) {
m_defaultPackage = node.getNodeValue();
} else {
m_defaultPackage = "";
}
}
/**
* INTERNAL:
*/
public XMLHelper(Document document, String fileName, ClassLoader loader) {
this(document, loader);
m_documentName = fileName;
}
/**
* INTERNAL:
*/
public List getCascadeTypes(Node node) {
ArrayList cTypes = new ArrayList();
NodeList cascadeTypes = getNodes(node, XMLConstants.CASCADE, XMLConstants.ALL_CHILDREN);
for (int i = 0; i < cascadeTypes.getLength(); i++) {
cTypes.add(cascadeTypes.item(i).getLocalName());
}
return cTypes;
}
/**
* INTERNAL:
*/
public Class getClassForName(String className) {
return MetadataHelper.getClassForName(getFullyQualifiedClassName(className), m_loader);
}
/**
* INTERNAL:
* Return the Class for a given node. This method assumes that the node
* requires a class attribute, i.e. entity or mapped-superclass.
*/
public Class getClassForNode(Node node) {
return MetadataHelper.getClassForName(getClassNameForNode(node), m_loader);
}
/**
* INTERNAL:
* Return the fully qualified class name for a given node. This method
* assumes that the node requires a class attribute, i.e. entity or
* mapped-superclass.
*/
public String getClassNameForNode(Node node) {
return getFullyQualifiedClassName(getNodeValue(node, XMLConstants.ATT_CLASS));
}
/**
* INTERNAL:
* Return the instance document associated with this helper.
*/
public Document getDocument() {
return m_document;
}
/**
* INTERNAL:
* Return the instance document name associated with this helper.
*/
public String getDocumentName() {
return m_documentName;
}
/**
* INTERNAL:
*/
public String getFetchTypeDefaultEAGER(Node node) {
return getNodeValue(node, XMLConstants.ATT_FETCH, MetadataConstants.EAGER);
}
/**
* INTERNAL:
*/
public String getFetchTypeDefaultLAZY(Node node) {
return getNodeValue(node, XMLConstants.ATT_FETCH, MetadataConstants.LAZY);
}
/**
* INTERNAL:
* This convenience method will attempt to fully qualify a class name if
* required. This assumes that the className value is non-null, and a
* "qualified" class name contains at least one '.'
*/
public String getFullyQualifiedClassName(String className) {
return getFullyQualifiedClassName(className, m_defaultPackage);
}
/**
* INTERNAL:
* This convenience method will attempt to fully qualify a class name if
* required. This assumes that the className value is non-null, and a
* "qualified" class name contains at least one '.'
*/
public static String getFullyQualifiedClassName(String className, String packageName) {
// if there is no global package defined or the class name is qualified, return className
if (packageName.equals("") || className.indexOf(".") != -1) {
return className;
}
// prepend the package to the class name
// format of global package is "foo.bar."
if (packageName.endsWith(".")) {
return (packageName + className);
}
// format of global package is "foo.bar"
return (packageName + "." + className);
}
/**
* INTERNAL:
* This convenience method determines the type of relationship mapping the
* node represents, and returns the appropriate logging context.
*/
public String getLoggingContextForDefaultMappingReferenceClass(Node mappingNode) {
if (mappingNode.getLocalName().equals(XMLConstants.ONE_TO_ONE)) {
return MetadataLogger.ONE_TO_ONE_MAPPING_REFERENCE_CLASS;
}
if (mappingNode.getLocalName().equals(XMLConstants.ONE_TO_MANY)) {
return MetadataLogger.ONE_TO_MANY_MAPPING_REFERENCE_CLASS;
}
if (mappingNode.getLocalName().equals(XMLConstants.MANY_TO_ONE)) {
return MetadataLogger.MANY_TO_ONE_MAPPING_REFERENCE_CLASS;
}
// assume many-to-many
return MetadataLogger.MANY_TO_MANY_MAPPING_REFERENCE_CLASS;
}
/**
* INTERNAL:
*/
public String getMappedBy(Node node) {
return getNodeValue(node, XMLConstants.ATT_MAPPED_BY, "");
}
/**
* INTERNAL:
* Get a node off the given node.
*/
public Node getNode(Node node, String xPath) {
return getNode(node, new String[] {xPath});
}
/**
* INTERNAL:
* Get a node off the given node.
*/
public Node getNode(Node node, String[] xPath) {
return m_xPathEngine.selectSingleNode(node, xPath);
}
/**
* INTERNAL:
* Get a node off the document node.
*/
public Node getNode(String[] xPath) {
return getNode(m_document, xPath);
}
/**
* INTERNAL:
* Get the nodes off the given node.
*/
public NodeList getNodes(String xPath1, String xPath2) {
return getNodes(m_document, new String[] {xPath1, xPath2});
}
/**
* INTERNAL:
* Get the nodes off the given node.
*/
public NodeList getNodes(String[] xPath) {
return getNodes(m_document, xPath);
}
/**
* INTERNAL:
*/
public String getNodeTextValue(Node node, String xPath) {
return getNodeValue(node, new String[] {xPath, XMLConstants.TEXT});
}
/**
* INTERNAL:
*/
public String getNodeTextValue(String xPath1, String xPath2) {
return getNodeValue(m_document, new String[] {xPath1, xPath2, XMLConstants.TEXT});
}
/**
* INTERNAL:
*/
public String getNodeTextValue(String xPath1, String xPath2, String defaultValue) {
return getNodeValue(m_document, new String[] {xPath1, xPath2, XMLConstants.TEXT}, defaultValue);
}
/**
* INTERNAL:
*/
public String getNodeValue(Node node, String xPath) {
return getNodeValue(node, new String[] {xPath});
}
/**
* INTERNAL:
*/
public boolean getNodeValue(Node node, String xPath, boolean defaultValue) {
return getNodeValue(node, new String[] {xPath}, defaultValue);
}
/**
* INTERNAL:
*/
public Class getNodeValue(Node node, String xPath, Class defaultValue) {
return getNodeValue(node, new String[] {xPath}, defaultValue);
}
/**
* INTERNAL:
*/
public int getNodeValue(Node node, String xPath, int defaultValue) {
return getNodeValue(node, new String[] {xPath}, defaultValue);
}
/**
* INTERNAL:
*/
public String getNodeValue(Node node, String xPath, String defaultValue) {
return getNodeValue(node, new String[] {xPath}, defaultValue);
}
/**
* INTERNAL:
*/
public NodeList getNodes(Node node, String xPath) {
return getNodes(node, new String[] {xPath});
}
/**
* INTERNAL:
*/
public NodeList getNodes(Node node, String xPath1, String xPath2) {
return getNodes(node, new String[] {xPath1, xPath2});
}
/**
* INTERNAL:
*/
public NodeList getNodes(Node node, String[] xPath) {
return m_xPathEngine.selectNodes(node, xPath);
}
/**
* INTERNAL:
*/
public boolean getNodeValue(Node node, String[] xPath, boolean defaultValue) {
return getValue(getNode(node, xPath), defaultValue);
}
/**
* INTERNAL:
*/
public Class getNodeValue(Node node, String[] xPath, Class defaultValue) {
return getValue(getNode(node, xPath), defaultValue);
}
/**
* INTERNAL:
*/
public int getNodeValue(Node node, String[] xPath, int defaultValue) {
return getValue(getNode(node, xPath), defaultValue);
}
/**
* INTERNAL:
*/
public String getNodeValue(Node node, String[] xPath, String defaultValue) {
return getValue(getNode(node, xPath), defaultValue);
}
/**
* INTERNAL:
*/
public String getNodeValue(Node node, String[] xPath) {
return getNodeValue(node, xPath, "");
}
/**
* INTERNAL:
*/
public String getNodeValue(String[] xPath) {
return getNodeValue(xPath, "");
}
/**
* INTERNAL:
*/
public int getNodeValue(String[] xPath, int defaultValue) {
return getValue(getNode(xPath), defaultValue);
}
/**
* INTERNAL:
*/
public String getNodeValue(String[] xPath, String defaultValue) {
return getValue(getNode(xPath), defaultValue);
}
/**
* INTERNAL:
*/
public String getPackage() {
return m_defaultPackage;
}
/**
* INTERNAL:
*/
public Class getTargetEntity(Node node) {
return getNodeValue(node, XMLConstants.ATT_TARGET_ENTITY, void.class);
}
/**
* INTERNAL:
*/
public NodeList getTextColumnNodes(Node node) {
return getNodes(node, new String[] {XMLConstants.COLUMN_NAME, XMLConstants.TEXT});
}
/**
* INTERNAL:
*/
private boolean getValue(Node node, boolean defaultValue) {
if (node == null) {
return defaultValue;
} else {
return Boolean.parseBoolean(node.getNodeValue());
}
}
/**
* INTERNAL:
*/
private Class getValue(Node node, Class defaultValue) {
if (node == null) {
return defaultValue;
} else {
return getClassForName(node.getNodeValue());
}
}
/**
* INTERNAL:
*/
private int getValue(Node node, int defaultValue) {
if (node == null) {
return defaultValue;
} else {
return Integer.parseInt(node.getNodeValue());
}
}
/**
* INTERNAL:
*/
private String getValue(Node node, String defaultValue) {
if (node == null) {
return defaultValue;
} else {
String value = node.getNodeValue();
if (value == null) {
return defaultValue;
} else {
return value;
}
}
}
/**
* INTERNAL:
*/
public boolean hasNode(Node node, String xPath) {
return getNode(node, xPath) != null;
}
/**
* INTERNAL:
*/
public boolean isOptional(Node node) {
return getNodeValue(node, XMLConstants.ATT_OPTIONAL, true);
}
/**
* INTERNAL:
* Locate a node in the DOM tree for a given class.
*/
public Node locateEmbeddableNode(Class cls) {
return locateNode(cls, XMLConstants.EMBEDDABLE);
}
/**
* INTERNAL:
* Locate a node in the DOM tree for a given class.
*/
public Node locateEntityNode(Class cls) {
return locateNode(cls, XMLConstants.ENTITY);
}
/**
* INTERNAL:
* Locate a node in the DOM tree for a given class.
*/
public Node locateMappedSuperclassNode(Class cls) {
return locateNode(cls, XMLConstants.MAPPED_SUPERCLASS);
}
/**
* INTERNAL:
* Locate a node in the DOM tree for the given class. Will look for
* an entity, embeddable, or mapped-superclass node with @class matching
* the class name.
*/
public Node locateNode(Class cls) {
Node result = null;
result = locateEntityNode(cls);
if (result == null) {
result = locateMappedSuperclassNode(cls);
}
if (result == null) {
result = locateEmbeddableNode(cls);
}
return result;
}
/**
* INTERNAL:
* Locate a node in the DOM tree for a given class.
* The search string should be used as follows:
* - For an entity: XMLConstants.ENTITY
* - For an embeddable: XMLConstants.EMBEDDABLE
* - For a mapped superclass: XMLConstants.MAPPED_SUPERCLASS
* Or call locateNode which will check them all. For efficiency, it looks
* for an entity first.
*/
private Node locateNode(Class cls, String searchString) {
NodeList nodes = getNodes(m_document, XMLConstants.ENTITY_MAPPINGS, searchString);
if (nodes != null) {
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
// process @class (required)
if (getClassNameForNode(node).equals(cls.getName())) {
return node;
}
}
}
return null;
}
/**
* INTERNAL:
* Locate a node in the DOM tree for a given attribute name.
*/
// WIP - method may go away.
public Node locateNodeForAttribute(Node node, String attributeName) {
NodeList attributeNodes = getNodes(node, XMLConstants.ATTRIBUTES, XMLConstants.ALL_CHILDREN);
if (attributeNodes != null) {
Node attributeNode;
for (int i = 0; i < attributeNodes.getLength(); i++) {
attributeNode = attributeNodes.item(i);
// process @name (required)
if (getNodeValue(attributeNode, XMLConstants.ATT_NAME).equals(attributeName)) {
return attributeNode;
}
}
}
return null;
}
/**
* INTERNAL:
* Return the root entity in an entity class hierarchy
*/
public Class locateRootEntity(Class entityClass) {
Class superclass = entityClass.getSuperclass();
if (superclass != null) {
Node entityNode = locateEntityNode(superclass);
if (entityNode != null) {
return locateRootEntity(superclass);
}
}
return entityClass;
}
/**
* INTERNAL:
* Indicates if a given node has a primary-key-join-column sub-element.
*/
public boolean nodeHasPrimaryKeyJoinColumns(Node node) {
if (node == null) {
return false;
}
NodeList nodes = getNodes(node, XMLConstants.PK_JOIN_COLUMN);
return (nodes != null && nodes.getLength() > 0);
}
/**
* INTERNAL:
* Indicates if a given node has a primary-key-join-column sub-element.
*/
public boolean nodeHasJoinColumns(Node node) {
if (node == null) {
return false;
}
NodeList nodes = getNodes(node, XMLConstants.JOIN_COLUMN);
return (nodes != null && nodes.getLength() > 0);
}
/**
* INTERNAL:
* Build a DOM from an instance document using the provided URL.
*/
public static Document parseDocument(InputStream xmlDocumentInputStream, String documentName, ClassLoader loader) {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
dbf.setAttribute(XMLConstants.SCHEMA_LANGUAGE, XMLConstants.XML_SCHEMA);
dbf.setValidating(true);
// attempt to load the schema from the classpath
URL schemaURL = loader.getResource(XMLConstants.ORM_SCHEMA_NAME);
if (schemaURL != null) {
dbf.setAttribute(XMLConstants.JAXP_SCHEMA_SOURCE, schemaURL.toString());
}
// create a document builder
DocumentBuilder db;
try {
db = dbf.newDocumentBuilder();
} catch (ParserConfigurationException pex) {
throw XMLParseException.exceptionCreatingDocumentBuilder(documentName, pex);
}
// set the parse exception handler
XMLExceptionHandler xmlExceptionHandler = new XMLExceptionHandler();
db.setErrorHandler(xmlExceptionHandler);
// parse the document
Document doc = null;
try {
doc = db.parse(xmlDocumentInputStream);
} catch (IOException ioex) {
throw XMLParseException.exceptionReadingXMLDocument(documentName, ioex);
} catch (SAXException saxex) {
// XMLExceptionHandler will handle parse exceptions
}
XMLException xmlEx = xmlExceptionHandler.getXMLException();
if (xmlEx != null) {
throw ValidationException.invalidEntityMappingsDocument(documentName, xmlEx);
}
return doc;
}
/**
* INTERNAL:
* Update the loader after it changes.
*/
public void setLoader(ClassLoader loader) {
m_loader = loader;
}
/**
* INTERNAL:
* Get the loader.
*/
public ClassLoader getClassLoader() {
return m_loader;
}
}
