| /* |
| * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package javax.xml.bind; |
| |
| import javax.xml.bind.annotation.XmlRootElement; |
| import javax.xml.namespace.QName; |
| import javax.xml.transform.Result; |
| import javax.xml.transform.Source; |
| import javax.xml.transform.stream.StreamResult; |
| import javax.xml.transform.stream.StreamSource; |
| import java.beans.Introspector; |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.Reader; |
| import java.io.Writer; |
| import java.lang.ref.WeakReference; |
| import java.net.HttpURLConnection; |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| import java.net.URL; |
| import java.net.URLConnection; |
| |
| /** |
| * Class that defines convenience methods for common, simple use of JAXB. |
| * |
| * <p> |
| * Methods defined in this class are convenience methods that combine several basic operations |
| * in the {@link JAXBContext}, {@link Unmarshaller}, and {@link Marshaller}. |
| * |
| * They are designed |
| * to be the prefered methods for developers new to JAXB. They have |
| * the following characterstics: |
| * |
| * <ol> |
| * <li>Generally speaking, the performance is not necessarily optimal. |
| * It is expected that people who need to write performance |
| * critical code will use the rest of the JAXB API directly. |
| * <li>Errors that happen during the processing is wrapped into |
| * {@link DataBindingException} (which will have {@link JAXBException} |
| * as its {@link Throwable#getCause() cause}. It is expected that |
| * people who prefer the checked exception would use |
| * the rest of the JAXB API directly. |
| * </ol> |
| * |
| * <p> |
| * In addition, the {@code unmarshal} methods have the following characteristic: |
| * |
| * <ol> |
| * <li>Schema validation is not performed on the input XML. |
| * The processing will try to continue even if there |
| * are errors in the XML, as much as possible. Only as |
| * the last resort, this method fails with {@link DataBindingException}. |
| * </ol> |
| * |
| * <p> |
| * Similarly, the {@code marshal} methods have the following characteristic: |
| * <ol> |
| * <li>The processing will try to continue even if the Java object tree |
| * does not meet the validity requirement. Only as |
| * the last resort, this method fails with {@link DataBindingException}. |
| * </ol> |
| * |
| * |
| * <p> |
| * All the methods on this class require non-null arguments to all parameters. |
| * The {@code unmarshal} methods either fail with an exception or return |
| * a non-null value. |
| * |
| * @author Kohsuke Kawaguchi |
| * @since 1.6, JAXB 2.1 |
| */ |
| public final class JAXB { |
| /** |
| * No instanciation is allowed. |
| */ |
| private JAXB() {} |
| |
| /** |
| * To improve the performance, we'll cache the last {@link JAXBContext} used. |
| */ |
| private static final class Cache { |
| final Class type; |
| final JAXBContext context; |
| |
| public Cache(Class type) throws JAXBException { |
| this.type = type; |
| this.context = JAXBContext.newInstance(type); |
| } |
| } |
| |
| /** |
| * Cache. We don't want to prevent the {@link Cache#type} from GC-ed, |
| * hence {@link WeakReference}. |
| */ |
| private static volatile WeakReference<Cache> cache; |
| |
| /** |
| * Obtains the {@link JAXBContext} from the given type, |
| * by using the cache if possible. |
| * |
| * <p> |
| * We don't use locks to control access to {@link #cache}, but this code |
| * should be thread-safe thanks to the immutable {@link Cache} and {@code volatile}. |
| */ |
| private static <T> JAXBContext getContext(Class<T> type) throws JAXBException { |
| WeakReference<Cache> c = cache; |
| if(c!=null) { |
| Cache d = c.get(); |
| if(d!=null && d.type==type) |
| return d.context; |
| } |
| |
| // overwrite the cache |
| Cache d = new Cache(type); |
| cache = new WeakReference<Cache>(d); |
| |
| return d.context; |
| } |
| |
| /** |
| * Reads in a Java object tree from the given XML input. |
| * |
| * @param xml |
| * Reads the entire file as XML. |
| */ |
| public static <T> T unmarshal( File xml, Class<T> type ) { |
| try { |
| JAXBElement<T> item = getContext(type).createUnmarshaller().unmarshal(new StreamSource(xml), type); |
| return item.getValue(); |
| } catch (JAXBException e) { |
| throw new DataBindingException(e); |
| } |
| } |
| |
| /** |
| * Reads in a Java object tree from the given XML input. |
| * |
| * @param xml |
| * The resource pointed by the URL is read in its entirety. |
| */ |
| public static <T> T unmarshal( URL xml, Class<T> type ) { |
| try { |
| JAXBElement<T> item = getContext(type).createUnmarshaller().unmarshal(toSource(xml), type); |
| return item.getValue(); |
| } catch (JAXBException e) { |
| throw new DataBindingException(e); |
| } catch (IOException e) { |
| throw new DataBindingException(e); |
| } |
| } |
| |
| /** |
| * Reads in a Java object tree from the given XML input. |
| * |
| * @param xml |
| * The URI is {@link URI#toURL() turned into URL} and then |
| * follows the handling of {@code URL}. |
| */ |
| public static <T> T unmarshal( URI xml, Class<T> type ) { |
| try { |
| JAXBElement<T> item = getContext(type).createUnmarshaller().unmarshal(toSource(xml), type); |
| return item.getValue(); |
| } catch (JAXBException e) { |
| throw new DataBindingException(e); |
| } catch (IOException e) { |
| throw new DataBindingException(e); |
| } |
| } |
| |
| /** |
| * Reads in a Java object tree from the given XML input. |
| * |
| * @param xml |
| * The string is first interpreted as an absolute {@code URI}. |
| * If it's not {@link URI#isAbsolute() a valid absolute URI}, |
| * then it's interpreted as a {@code File} |
| */ |
| public static <T> T unmarshal( String xml, Class<T> type ) { |
| try { |
| JAXBElement<T> item = getContext(type).createUnmarshaller().unmarshal(toSource(xml), type); |
| return item.getValue(); |
| } catch (JAXBException e) { |
| throw new DataBindingException(e); |
| } catch (IOException e) { |
| throw new DataBindingException(e); |
| } |
| } |
| |
| /** |
| * Reads in a Java object tree from the given XML input. |
| * |
| * @param xml |
| * The entire stream is read as an XML infoset. |
| * Upon a successful completion, the stream will be closed by this method. |
| */ |
| public static <T> T unmarshal( InputStream xml, Class<T> type ) { |
| try { |
| JAXBElement<T> item = getContext(type).createUnmarshaller().unmarshal(toSource(xml), type); |
| return item.getValue(); |
| } catch (JAXBException e) { |
| throw new DataBindingException(e); |
| } catch (IOException e) { |
| throw new DataBindingException(e); |
| } |
| } |
| |
| /** |
| * Reads in a Java object tree from the given XML input. |
| * |
| * @param xml |
| * The character stream is read as an XML infoset. |
| * The encoding declaration in the XML will be ignored. |
| * Upon a successful completion, the stream will be closed by this method. |
| */ |
| public static <T> T unmarshal( Reader xml, Class<T> type ) { |
| try { |
| JAXBElement<T> item = getContext(type).createUnmarshaller().unmarshal(toSource(xml), type); |
| return item.getValue(); |
| } catch (JAXBException e) { |
| throw new DataBindingException(e); |
| } catch (IOException e) { |
| throw new DataBindingException(e); |
| } |
| } |
| |
| /** |
| * Reads in a Java object tree from the given XML input. |
| * |
| * @param xml |
| * The XML infoset that the {@link Source} represents is read. |
| */ |
| public static <T> T unmarshal( Source xml, Class<T> type ) { |
| try { |
| JAXBElement<T> item = getContext(type).createUnmarshaller().unmarshal(toSource(xml), type); |
| return item.getValue(); |
| } catch (JAXBException e) { |
| throw new DataBindingException(e); |
| } catch (IOException e) { |
| throw new DataBindingException(e); |
| } |
| } |
| |
| |
| |
| /** |
| * Creates {@link Source} from various XML representation. |
| * See {@link #unmarshal} for the conversion rules. |
| */ |
| private static Source toSource(Object xml) throws IOException { |
| if(xml==null) |
| throw new IllegalArgumentException("no XML is given"); |
| |
| if (xml instanceof String) { |
| try { |
| xml=new URI((String)xml); |
| } catch (URISyntaxException e) { |
| xml=new File((String)xml); |
| } |
| } |
| if (xml instanceof File) { |
| File file = (File) xml; |
| return new StreamSource(file); |
| } |
| if (xml instanceof URI) { |
| URI uri = (URI) xml; |
| xml=uri.toURL(); |
| } |
| if (xml instanceof URL) { |
| URL url = (URL) xml; |
| return new StreamSource(url.toExternalForm()); |
| } |
| if (xml instanceof InputStream) { |
| InputStream in = (InputStream) xml; |
| return new StreamSource(in); |
| } |
| if (xml instanceof Reader) { |
| Reader r = (Reader) xml; |
| return new StreamSource(r); |
| } |
| if (xml instanceof Source) { |
| return (Source) xml; |
| } |
| throw new IllegalArgumentException("I don't understand how to handle "+xml.getClass()); |
| } |
| |
| /** |
| * Writes a Java object tree to XML and store it to the specified location. |
| * |
| * @param jaxbObject |
| * The Java object to be marshalled into XML. If this object is |
| * a {@link JAXBElement}, it will provide the root tag name and |
| * the body. If this object has {@link XmlRootElement} |
| * on its class definition, that will be used as the root tag name |
| * and the given object will provide the body. Otherwise, |
| * the root tag name is {@link Introspector#decapitalize(String) infered} from |
| * {@link Class#getSimpleName() the short class name}. |
| * This parameter must not be null. |
| * |
| * @param xml |
| * XML will be written to this file. If it already exists, |
| * it will be overwritten. |
| * |
| * @throws DataBindingException |
| * If the operation fails, such as due to I/O error, unbindable classes. |
| */ |
| public static void marshal( Object jaxbObject, File xml ) { |
| _marshal(jaxbObject,xml); |
| } |
| |
| /** |
| * Writes a Java object tree to XML and store it to the specified location. |
| * |
| * @param jaxbObject |
| * The Java object to be marshalled into XML. If this object is |
| * a {@link JAXBElement}, it will provide the root tag name and |
| * the body. If this object has {@link XmlRootElement} |
| * on its class definition, that will be used as the root tag name |
| * and the given object will provide the body. Otherwise, |
| * the root tag name is {@link Introspector#decapitalize(String) infered} from |
| * {@link Class#getSimpleName() the short class name}. |
| * This parameter must not be null. |
| * |
| * @param xml |
| * The XML will be {@link URLConnection#getOutputStream() sent} to the |
| * resource pointed by this URL. Note that not all {@code URL}s support |
| * such operation, and exact semantics depends on the {@code URL} |
| * implementations. In case of {@link HttpURLConnection HTTP URLs}, |
| * this will perform HTTP POST. |
| * |
| * @throws DataBindingException |
| * If the operation fails, such as due to I/O error, unbindable classes. |
| */ |
| public static void marshal( Object jaxbObject, URL xml ) { |
| _marshal(jaxbObject,xml); |
| } |
| |
| /** |
| * Writes a Java object tree to XML and store it to the specified location. |
| * |
| * @param jaxbObject |
| * The Java object to be marshalled into XML. If this object is |
| * a {@link JAXBElement}, it will provide the root tag name and |
| * the body. If this object has {@link XmlRootElement} |
| * on its class definition, that will be used as the root tag name |
| * and the given object will provide the body. Otherwise, |
| * the root tag name is {@link Introspector#decapitalize(String) infered} from |
| * {@link Class#getSimpleName() the short class name}. |
| * This parameter must not be null. |
| * |
| * @param xml |
| * The URI is {@link URI#toURL() turned into URL} and then |
| * follows the handling of {@code URL}. See above. |
| * |
| * @throws DataBindingException |
| * If the operation fails, such as due to I/O error, unbindable classes. |
| */ |
| public static void marshal( Object jaxbObject, URI xml ) { |
| _marshal(jaxbObject,xml); |
| } |
| |
| /** |
| * Writes a Java object tree to XML and store it to the specified location. |
| * |
| * @param jaxbObject |
| * The Java object to be marshalled into XML. If this object is |
| * a {@link JAXBElement}, it will provide the root tag name and |
| * the body. If this object has {@link XmlRootElement} |
| * on its class definition, that will be used as the root tag name |
| * and the given object will provide the body. Otherwise, |
| * the root tag name is {@link Introspector#decapitalize(String) infered} from |
| * {@link Class#getSimpleName() the short class name}. |
| * This parameter must not be null. |
| * |
| * @param xml |
| * The string is first interpreted as an absolute {@code URI}. |
| * If it's not {@link URI#isAbsolute() a valid absolute URI}, |
| * then it's interpreted as a {@code File} |
| * |
| * @throws DataBindingException |
| * If the operation fails, such as due to I/O error, unbindable classes. |
| */ |
| public static void marshal( Object jaxbObject, String xml ) { |
| _marshal(jaxbObject,xml); |
| } |
| |
| /** |
| * Writes a Java object tree to XML and store it to the specified location. |
| * |
| * @param jaxbObject |
| * The Java object to be marshalled into XML. If this object is |
| * a {@link JAXBElement}, it will provide the root tag name and |
| * the body. If this object has {@link XmlRootElement} |
| * on its class definition, that will be used as the root tag name |
| * and the given object will provide the body. Otherwise, |
| * the root tag name is {@link Introspector#decapitalize(String) infered} from |
| * {@link Class#getSimpleName() the short class name}. |
| * This parameter must not be null. |
| * |
| * @param xml |
| * The XML will be sent to the given {@link OutputStream}. |
| * Upon a successful completion, the stream will be closed by this method. |
| * |
| * @throws DataBindingException |
| * If the operation fails, such as due to I/O error, unbindable classes. |
| */ |
| public static void marshal( Object jaxbObject, OutputStream xml ) { |
| _marshal(jaxbObject,xml); |
| } |
| |
| /** |
| * Writes a Java object tree to XML and store it to the specified location. |
| * |
| * @param jaxbObject |
| * The Java object to be marshalled into XML. If this object is |
| * a {@link JAXBElement}, it will provide the root tag name and |
| * the body. If this object has {@link XmlRootElement} |
| * on its class definition, that will be used as the root tag name |
| * and the given object will provide the body. Otherwise, |
| * the root tag name is {@link Introspector#decapitalize(String) infered} from |
| * {@link Class#getSimpleName() the short class name}. |
| * This parameter must not be null. |
| * |
| * @param xml |
| * The XML will be sent as a character stream to the given {@link Writer}. |
| * Upon a successful completion, the stream will be closed by this method. |
| * |
| * @throws DataBindingException |
| * If the operation fails, such as due to I/O error, unbindable classes. |
| */ |
| public static void marshal( Object jaxbObject, Writer xml ) { |
| _marshal(jaxbObject,xml); |
| } |
| |
| /** |
| * Writes a Java object tree to XML and store it to the specified location. |
| * |
| * @param jaxbObject |
| * The Java object to be marshalled into XML. If this object is |
| * a {@link JAXBElement}, it will provide the root tag name and |
| * the body. If this object has {@link XmlRootElement} |
| * on its class definition, that will be used as the root tag name |
| * and the given object will provide the body. Otherwise, |
| * the root tag name is {@link Introspector#decapitalize(String) infered} from |
| * {@link Class#getSimpleName() the short class name}. |
| * This parameter must not be null. |
| * |
| * @param xml |
| * The XML will be sent to the {@link Result} object. |
| * |
| * @throws DataBindingException |
| * If the operation fails, such as due to I/O error, unbindable classes. |
| */ |
| public static void marshal( Object jaxbObject, Result xml ) { |
| _marshal(jaxbObject,xml); |
| } |
| |
| /** |
| * Writes a Java object tree to XML and store it to the specified location. |
| * |
| * <p> |
| * This method is a convenience method that combines several basic operations |
| * in the {@link JAXBContext} and {@link Marshaller}. This method is designed |
| * to be the prefered method for developers new to JAXB. This method |
| * has the following characterstics: |
| * |
| * <ol> |
| * <li>Generally speaking, the performance is not necessarily optimal. |
| * It is expected that those people who need to write performance |
| * critical code will use the rest of the JAXB API directly. |
| * <li>Errors that happen during the processing is wrapped into |
| * {@link DataBindingException} (which will have {@link JAXBException} |
| * as its {@link Throwable#getCause() cause}. It is expected that |
| * those people who prefer the checked exception would use |
| * the rest of the JAXB API directly. |
| * </ol> |
| * |
| * @param jaxbObject |
| * The Java object to be marshalled into XML. If this object is |
| * a {@link JAXBElement}, it will provide the root tag name and |
| * the body. If this object has {@link XmlRootElement} |
| * on its class definition, that will be used as the root tag name |
| * and the given object will provide the body. Otherwise, |
| * the root tag name is {@link Introspector#decapitalize(String) infered} from |
| * {@link Class#getSimpleName() the short class name}. |
| * This parameter must not be null. |
| * |
| * @param xml |
| * Represents the receiver of XML. Objects of the following types are allowed. |
| * |
| * <table><tr> |
| * <th>Type</th> |
| * <th>Operation</th> |
| * </tr><tr> |
| * <td>{@link File}</td> |
| * <td>XML will be written to this file. If it already exists, |
| * it will be overwritten.</td> |
| * </tr><tr> |
| * <td>{@link URL}</td> |
| * <td>The XML will be {@link URLConnection#getOutputStream() sent} to the |
| * resource pointed by this URL. Note that not all {@code URL}s support |
| * such operation, and exact semantics depends on the {@code URL} |
| * implementations. In case of {@link HttpURLConnection HTTP URLs}, |
| * this will perform HTTP POST.</td> |
| * </tr><tr> |
| * <td>{@link URI}</td> |
| * <td>The URI is {@link URI#toURL() turned into URL} and then |
| * follows the handling of {@code URL}. See above.</td> |
| * </tr><tr> |
| * <td>{@link String}</td> |
| * <td>The string is first interpreted as an absolute {@code URI}. |
| * If it's not {@link URI#isAbsolute() a valid absolute URI}, |
| * then it's interpreted as a {@code File}</td> |
| * </tr><tr> |
| * <td>{@link OutputStream}</td> |
| * <td>The XML will be sent to the given {@link OutputStream}. |
| * Upon a successful completion, the stream will be closed by this method.</td> |
| * </tr><tr> |
| * <td>{@link Writer}</td> |
| * <td>The XML will be sent as a character stream to the given {@link Writer}. |
| * Upon a successful completion, the stream will be closed by this method.</td> |
| * </tr><tr> |
| * <td>{@link Result}</td> |
| * <td>The XML will be sent to the {@link Result} object.</td> |
| * </tr></table> |
| * |
| * @throws DataBindingException |
| * If the operation fails, such as due to I/O error, unbindable classes. |
| */ |
| private static void _marshal( Object jaxbObject, Object xml ) { |
| try { |
| JAXBContext context; |
| |
| if(jaxbObject instanceof JAXBElement) { |
| context = getContext(((JAXBElement<?>)jaxbObject).getDeclaredType()); |
| } else { |
| Class<?> clazz = jaxbObject.getClass(); |
| XmlRootElement r = clazz.getAnnotation(XmlRootElement.class); |
| context = getContext(clazz); |
| if(r==null) { |
| // we need to infer the name |
| jaxbObject = new JAXBElement(new QName(inferName(clazz)),clazz,jaxbObject); |
| } |
| } |
| |
| Marshaller m = context.createMarshaller(); |
| m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,true); |
| m.marshal(jaxbObject, toResult(xml)); |
| } catch (JAXBException e) { |
| throw new DataBindingException(e); |
| } catch (IOException e) { |
| throw new DataBindingException(e); |
| } |
| } |
| |
| private static String inferName(Class clazz) { |
| return Introspector.decapitalize(clazz.getSimpleName()); |
| } |
| |
| /** |
| * Creates {@link Result} from various XML representation. |
| * See {@link #_marshal(Object,Object)} for the conversion rules. |
| */ |
| private static Result toResult(Object xml) throws IOException { |
| if(xml==null) |
| throw new IllegalArgumentException("no XML is given"); |
| |
| if (xml instanceof String) { |
| try { |
| xml=new URI((String)xml); |
| } catch (URISyntaxException e) { |
| xml=new File((String)xml); |
| } |
| } |
| if (xml instanceof File) { |
| File file = (File) xml; |
| return new StreamResult(file); |
| } |
| if (xml instanceof URI) { |
| URI uri = (URI) xml; |
| xml=uri.toURL(); |
| } |
| if (xml instanceof URL) { |
| URL url = (URL) xml; |
| URLConnection con = url.openConnection(); |
| con.setDoOutput(true); |
| con.setDoInput(false); |
| con.connect(); |
| return new StreamResult(con.getOutputStream()); |
| } |
| if (xml instanceof OutputStream) { |
| OutputStream os = (OutputStream) xml; |
| return new StreamResult(os); |
| } |
| if (xml instanceof Writer) { |
| Writer w = (Writer)xml; |
| return new StreamResult(w); |
| } |
| if (xml instanceof Result) { |
| return (Result) xml; |
| } |
| throw new IllegalArgumentException("I don't understand how to handle "+xml.getClass()); |
| } |
| |
| } |