org.apache.openjpa.persistence.jest.XMLFormatter Maven / Gradle / Ivy
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* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.openjpa.persistence.jest;
import static org.apache.openjpa.persistence.jest.Constants.ATTR_ID;
import static org.apache.openjpa.persistence.jest.Constants.ATTR_KEY_TYPE;
import static org.apache.openjpa.persistence.jest.Constants.ATTR_MEMBER_TYPE;
import static org.apache.openjpa.persistence.jest.Constants.ATTR_NAME;
import static org.apache.openjpa.persistence.jest.Constants.ATTR_NULL;
import static org.apache.openjpa.persistence.jest.Constants.ATTR_TYPE;
import static org.apache.openjpa.persistence.jest.Constants.ATTR_VALUE_TYPE;
import static org.apache.openjpa.persistence.jest.Constants.ATTR_VERSION;
import static org.apache.openjpa.persistence.jest.Constants.ELEMENT_DESCRIPTION;
import static org.apache.openjpa.persistence.jest.Constants.ELEMENT_ENTRY;
import static org.apache.openjpa.persistence.jest.Constants.ELEMENT_ENTRY_KEY;
import static org.apache.openjpa.persistence.jest.Constants.ELEMENT_ENTRY_VALUE;
import static org.apache.openjpa.persistence.jest.Constants.ELEMENT_INSTANCE;
import static org.apache.openjpa.persistence.jest.Constants.ELEMENT_MEMBER;
import static org.apache.openjpa.persistence.jest.Constants.ELEMENT_NULL_REF;
import static org.apache.openjpa.persistence.jest.Constants.ELEMENT_REF;
import static org.apache.openjpa.persistence.jest.Constants.ELEMENT_URI;
import static org.apache.openjpa.persistence.jest.Constants.JEST_INSTANCE_XSD;
import static org.apache.openjpa.persistence.jest.Constants.MIME_TYPE_XML;
import static org.apache.openjpa.persistence.jest.Constants.NULL_VALUE;
import static org.apache.openjpa.persistence.jest.Constants.ROOT_ELEMENT_INSTANCE;
import static org.apache.openjpa.persistence.jest.Constants.ROOT_ELEMENT_MODEL;
import java.io.BufferedReader;
import java.io.CharArrayWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.util.Arrays;
import java.util.BitSet;
import java.util.Collection;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.persistence.metamodel.Attribute;
import javax.persistence.metamodel.ManagedType;
import javax.persistence.metamodel.MapAttribute;
import javax.persistence.metamodel.Metamodel;
import javax.persistence.metamodel.PluralAttribute;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
import org.apache.openjpa.kernel.OpenJPAStateManager;
import org.apache.openjpa.kernel.StoreContext;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.meta.ClassMetaData;
import org.apache.openjpa.meta.FieldMetaData;
import org.apache.openjpa.meta.JavaTypes;
import org.apache.openjpa.meta.ValueMetaData;
import org.apache.openjpa.persistence.meta.Members;
import org.apache.openjpa.util.InternalException;
import org.w3c.dom.CDATASection;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/**
* Marshals a root instance and its persistent closure as an XML element.
* The closure is resolved against the persistence context that contains the root instance.
* The XML document adheres to the jest-instance.xsd schema.
*
* @author Pinaki Poddar
*
*/
public class XMLFormatter implements ObjectFormatter {
public static final Schema _xsd;
private static final DocumentBuilder _builder;
private static final Transformer _transformer;
private static final String EMPTY_TEXT = " ";
protected static Localizer _loc = Localizer.forPackage(XMLFormatter.class);
static {
try {
_builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
_transformer = TransformerFactory.newInstance().newTransformer();
SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
InputStream xsd = XMLFormatter.class.getResourceAsStream(JEST_INSTANCE_XSD);
_xsd = factory.newSchema(new StreamSource(xsd));
_transformer.setOutputProperty(OutputKeys.METHOD, "xml");
_transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
_transformer.setOutputProperty(OutputKeys.INDENT, "yes");
_transformer.setOutputProperty(OutputKeys.STANDALONE, "no");
_transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
_transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public String getMimeType() {
return MIME_TYPE_XML;
}
/**
* Encodes the closure of given collection of managed instance into a new XML document
* according to JEST Instance XML Schema.
*
* @param sm a collection of managed instances.
* @param parent the parent node to which the new node be attached.
*/
public Document encode(final Collection sms, Metamodel model) {
Element root = newDocument(ROOT_ELEMENT_INSTANCE);
Closure closure = new Closure(sms);
for (OpenJPAStateManager sm : closure) {
encodeManagedInstance(sm, root, false, model);
}
return root.getOwnerDocument();
}
/**
* Encodes the given meta-model into a new XML document according to JEST Domain XML Schema.
*
* @param model a persistent domain model. Must not be null.
*/
public Document encode(Metamodel model) {
Element root = newDocument(ROOT_ELEMENT_MODEL);
for (ManagedType t : model.getManagedTypes()) {
encodeManagedType(t, root);
}
return root.getOwnerDocument();
}
/**
* Create a new document with the given tag as the root element.
*
* @param rootTag the tag of the root element
*
* @return the document element of a new document
*/
public Element newDocument(String rootTag) {
Document doc = _builder.newDocument();
Element root = doc.createElement(rootTag);
doc.appendChild(root);
String[] nvpairs = new String[] {
"xmlns:xsi", XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI,
// "xsi:noNamespaceSchemaLocation", JEST_INSTANCE_XSD,
ATTR_VERSION, "1.0",
};
for (int i = 0; i < nvpairs.length; i += 2) {
root.setAttribute(nvpairs[i], nvpairs[i+1]);
}
return root;
}
@Override
public Document writeOut(Collection objs, Metamodel model, String title, String desc,
String uri, OutputStream out) throws IOException {
Document doc = encode(objs, model);
decorate(doc, title, desc, uri);
write(doc, out);
return doc;
}
@Override
public Document writeOut(Metamodel model, String title, String desc, String uri, OutputStream out)
throws IOException {
Document doc = encode(model);
decorate(doc, title, desc, uri);
write(doc, out);
return doc;
}
Document decorate(Document doc, String title, String desc, String uri) {
Element root = doc.getDocumentElement();
Element instance = (Element)root.getElementsByTagName(ELEMENT_INSTANCE).item(0);
Element uriElement = doc.createElement(ELEMENT_URI);
uriElement.setTextContent(uri == null ? NULL_VALUE : uri);
Element descElement = doc.createElement(ELEMENT_DESCRIPTION);
descElement.setTextContent(desc == null ? NULL_VALUE : desc);
root.insertBefore(uriElement, instance);
root.insertBefore(descElement, instance);
return doc;
}
public void write(Document doc, OutputStream out) throws IOException {
try {
_transformer.transform(new DOMSource(doc), new StreamResult(out));
} catch (Exception e) {
throw new IOException(e);
}
}
public void write(Document doc, Writer writer) throws IOException {
try {
_transformer.transform(new DOMSource(doc), new StreamResult(writer));
} catch (Exception e) {
throw new IOException(e);
}
}
/**
* Encodes the closure of a persistent instance into a XML element.
*
* @param sm the managed instance to be encoded. Can be null.
* @param parent the parent XML element to which the new XML element be added. Must not be null. Must be
* owned by a document.
* @param visited the persistent instances that had been encoded already. Must not be null or immutable.
*
* @return the new element. The element has been appended as a child to the given parent in this method.
*/
private Element encodeManagedInstance(final OpenJPAStateManager sm, final Element parent,
boolean isRef, Metamodel model) {
if (parent == null)
throw new InternalException(_loc.get("format-xml-null-parent"));
Document doc = parent.getOwnerDocument();
if (doc == null)
throw new InternalException(_loc.get("format-xml-null-doc"));
if (sm == null || isRef) {
return encodeRef(parent, sm);
}
Element root = doc.createElement(ELEMENT_INSTANCE);
parent.appendChild(root);
root.setAttribute(ATTR_ID, ior(sm));
Element child = null;
BitSet loaded = sm.getLoaded();
StoreContext ctx = (StoreContext)sm.getGenericContext();
List> attrs = MetamodelHelper.getAttributesInOrder(sm.getMetaData(), model);
for (int i = 0; i < attrs.size(); child = null, i++) {
Members.Member attr = (Members.Member) attrs.get(i);
FieldMetaData fmd = attr.fmd;
if (!loaded.get(fmd.getIndex()))
continue;
String tag = MetamodelHelper.getTagByAttributeType(attr);
Object value = sm.fetch(fmd.getIndex());
switch (fmd.getDeclaredTypeCode()) {
case JavaTypes.BOOLEAN:
case JavaTypes.BYTE:
case JavaTypes.CHAR:
case JavaTypes.DOUBLE:
case JavaTypes.FLOAT:
case JavaTypes.INT:
case JavaTypes.LONG:
case JavaTypes.SHORT:
case JavaTypes.BOOLEAN_OBJ:
case JavaTypes.BYTE_OBJ:
case JavaTypes.CHAR_OBJ:
case JavaTypes.DOUBLE_OBJ:
case JavaTypes.FLOAT_OBJ:
case JavaTypes.INT_OBJ:
case JavaTypes.LONG_OBJ:
case JavaTypes.SHORT_OBJ:
case JavaTypes.BIGDECIMAL:
case JavaTypes.BIGINTEGER:
case JavaTypes.DATE:
case JavaTypes.NUMBER:
case JavaTypes.CALENDAR:
case JavaTypes.LOCALE:
case JavaTypes.STRING:
case JavaTypes.ENUM:
child = doc.createElement(tag);
child.setAttribute(ATTR_NAME, fmd.getName());
if (value == null) {
encodeNull(child);
} else {
encodeBasic(child, value, fmd.getDeclaredType());
}
break;
case JavaTypes.OID:
child = doc.createElement(ELEMENT_REF);
child.setAttribute(ATTR_NAME, fmd.getName());
if (value == null) {
encodeNull(child);
} else {
encodeBasic(child, value, fmd.getDeclaredType());
}
break;
case JavaTypes.PC:
child = doc.createElement(tag);
child.setAttribute(ATTR_NAME, fmd.getName());
child.setAttribute(ATTR_TYPE, typeOf(fmd));
OpenJPAStateManager other = ctx.getStateManager(value);
encodeManagedInstance(other, child, true, model);
break;
case JavaTypes.ARRAY:
Object[] values = (Object[])value;
value = Arrays.asList(values);
// no break;
case JavaTypes.COLLECTION:
child = doc.createElement(tag);
child.setAttribute(ATTR_NAME, fmd.getName());
child.setAttribute(ATTR_TYPE, typeOf(fmd));
child.setAttribute(ATTR_MEMBER_TYPE, typeOf(fmd.getElement().getDeclaredType()));
if (value == null) {
encodeNull(child);
break;
}
Collection members = (Collection)value;
boolean basic = fmd.getElement().getTypeMetaData() == null;
for (Object o : members) {
Element member = doc.createElement(ELEMENT_MEMBER);
child.appendChild(member);
if (o == null) {
encodeNull(member);
} else {
if (basic) {
encodeBasic(member, o, o.getClass());
} else {
encodeManagedInstance(ctx.getStateManager(o), member, true, model);
}
}
}
break;
case JavaTypes.MAP:
child = doc.createElement(tag);
child.setAttribute(ATTR_NAME, fmd.getName());
child.setAttribute(ATTR_TYPE, typeOf(fmd));
child.setAttribute(ATTR_KEY_TYPE, typeOf(fmd.getElement().getDeclaredType()));
child.setAttribute(ATTR_VALUE_TYPE, typeOf(fmd.getValue().getDeclaredType()));
if (value == null) {
encodeNull(child);
break;
}
Set> entries = ((Map)value).entrySet();
boolean basicKey = fmd.getElement().getTypeMetaData() == null;
boolean basicValue = fmd.getValue().getTypeMetaData() == null;
for (Map.Entry e : entries) {
Element entry = doc.createElement(ELEMENT_ENTRY);
Element entryKey = doc.createElement(ELEMENT_ENTRY_KEY);
Element entryValue = doc.createElement(ELEMENT_ENTRY_VALUE);
entry.appendChild(entryKey);
entry.appendChild(entryValue);
child.appendChild(entry);
if (e.getKey() == null) {
encodeNull(entryKey);
} else {
if (basicKey) {
encodeBasic(entryKey, e.getKey(), e.getKey().getClass());
} else {
encodeManagedInstance(ctx.getStateManager(e.getKey()), entryKey, true, model);
}
}
if (e.getValue() == null) {
encodeNull(entryValue);
} else {
if (basicValue) {
encodeBasic(entryValue, e.getValue(), e.getValue().getClass());
} else {
encodeManagedInstance(ctx.getStateManager(e.getValue()), entryValue, true, model);
}
}
}
break;
case JavaTypes.INPUT_STREAM:
case JavaTypes.INPUT_READER:
child = doc.createElement(tag);
child.setAttribute(ATTR_NAME, fmd.getName());
child.setAttribute(ATTR_TYPE, typeOf(fmd));
if (value == null) {
encodeNull(child);
} else {
CDATASection data = doc.createCDATASection(streamToString(value));
child.appendChild(data);
}
break;
case JavaTypes.PC_UNTYPED:
case JavaTypes.OBJECT:
// START - ALLOW PRINT STATEMENTS
System.err.println("Not handled " + fmd.getName() + " of type " + fmd.getDeclaredType());
// STOP - ALLOW PRINT STATEMENTS
}
if (child != null) {
root.appendChild(child);
}
}
return root;
}
/**
* Sets the given value element as null. The null attribute is set to true.
*
* @param element the XML element to be set
*/
private void encodeNull(Element element) {
element.setAttribute(ATTR_NULL, "true");
}
private Element encodeRef(Element parent, OpenJPAStateManager sm) {
Element ref = parent.getOwnerDocument().createElement(sm == null ? ELEMENT_NULL_REF : ELEMENT_REF);
if (sm != null)
ref.setAttribute(ATTR_ID, ior(sm));
// IMPORTANT: for xml transformer not to omit the closing tag, otherwise dojo is confused
ref.setTextContent(EMPTY_TEXT);
parent.appendChild(ref);
return ref;
}
/**
* Sets the given value element. The type is set to the given runtime type.
* String form of the given object is set as the text content.
*
* @param element the XML element to be set
* @param obj value of the element. Never null.
*/
private void encodeBasic(Element element, Object obj, Class runtimeType) {
element.setAttribute(ATTR_TYPE, typeOf(runtimeType));
if (obj instanceof Date)
element.setTextContent(dateFormat.format(obj));
else
element.setTextContent(obj == null ? NULL_VALUE : obj.toString());
}
/**
* Convert the given stream (either an InutStream or a Reader) to a String
* to be included in CDATA section of a XML document.
*
* @param value the field value to be converted. Can not be null
*/
private String streamToString(Object value) {
Reader reader = null;
if (value instanceof InputStream) {
reader = new BufferedReader(new InputStreamReader((InputStream)value));
} else if (value instanceof Reader) {
reader = (Reader)value;
} else {
throw new RuntimeException();
}
CharArrayWriter writer = new CharArrayWriter();
try {
for (int c; (c = reader.read()) != -1;) {
writer.write(c);
}
} catch (IOException ex) {
throw new RuntimeException(ex);
}
return writer.toString();
}
private void encodeManagedType(ManagedType type, Element parent) {
Document doc = parent.getOwnerDocument();
Element root = doc.createElement(type.getPersistenceType().toString().toLowerCase());
parent.appendChild(root);
root.setAttribute(ATTR_NAME, type.getJavaType().getSimpleName());
List> attributes = MetamodelHelper.getAttributesInOrder(type);
for (Attribute a : attributes) {
String tag = MetamodelHelper.getTagByAttributeType(a);
Element child = doc.createElement(tag);
root.appendChild(child);
child.setAttribute(ATTR_TYPE, typeOf(a.getJavaType()));
if (a instanceof PluralAttribute) {
if (a instanceof MapAttribute) {
child.setAttribute(ATTR_KEY_TYPE, typeOf(((MapAttribute)a).getKeyJavaType()));
child.setAttribute(ATTR_VALUE_TYPE, typeOf(((MapAttribute)a).getBindableJavaType()));
} else {
child.setAttribute(ATTR_MEMBER_TYPE, typeOf(((PluralAttribute)a).getBindableJavaType()));
}
}
child.setTextContent(a.getName());
}
}
void validate(Document doc) throws Exception {
Validator validator = _xsd.newValidator();
validator.validate(new DOMSource(doc));
}
String ior(OpenJPAStateManager sm) {
return typeOf(sm) + "-" + sm.getObjectId();
}
String typeOf(OpenJPAStateManager sm) {
return sm.getMetaData().getDescribedType().getSimpleName();
}
String typeOf(Class cls) {
return cls.getSimpleName();
}
String typeOf(ClassMetaData meta) {
return meta.getDescribedType().getSimpleName();
}
String typeOf(ValueMetaData vm) {
if (vm.getTypeMetaData() == null)
return typeOf(vm.getType());
return typeOf(vm.getTypeMetaData());
}
String typeOf(FieldMetaData fmd) {
return fmd.getType().getSimpleName();
}
}
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