Java tutorial
/** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * 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 com.msopentech.odatajclient.engine.data.impl.v3; import com.msopentech.odatajclient.engine.client.ODataClient; import com.msopentech.odatajclient.engine.data.impl.AbstractPayloadObject; import com.msopentech.odatajclient.engine.utils.ODataConstants; import com.msopentech.odatajclient.engine.utils.ODataVersion; import com.msopentech.odatajclient.engine.utils.XMLUtils; import java.util.List; import javax.xml.XMLConstants; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.ParserConfigurationException; import org.apache.commons.lang3.StringUtils; import org.apache.http.entity.ContentType; import org.w3c.dom.Document; import org.w3c.dom.Element; public class AtomSerializer { private final ODataClient client; public AtomSerializer(final ODataClient client) { this.client = client; } public <T extends AbstractPayloadObject> Element serialize(final T obj) throws ParserConfigurationException { if (obj instanceof AtomEntry) { return entry((AtomEntry) obj); } else if (obj instanceof AtomFeed) { return feed((AtomFeed) obj); } else { throw new IllegalArgumentException("Unsupported Atom object for standalone serialization: " + obj); } } private void setLinks(final Element entry, final List<AtomLink> links) throws ParserConfigurationException { for (AtomLink link : links) { final Element linkElem = entry.getOwnerDocument().createElement(ODataConstants.ATOM_ELEM_LINK); linkElem.setAttribute(ODataConstants.ATTR_REL, link.getRel()); linkElem.setAttribute(ODataConstants.ATTR_TITLE, link.getTitle()); linkElem.setAttribute(ODataConstants.ATTR_HREF, link.getHref()); if (StringUtils.isNotBlank(link.getType())) { linkElem.setAttribute(ODataConstants.ATTR_TYPE, link.getType()); } if (link.getInlineEntry() != null || link.getInlineFeed() != null) { final Element inline = entry.getOwnerDocument().createElement(ODataConstants.ATOM_ELEM_INLINE); linkElem.appendChild(inline); if (link.getInlineEntry() != null) { inline.appendChild( entry.getOwnerDocument().importNode(entry((AtomEntry) link.getInlineEntry()), true)); } if (link.getInlineFeed() != null) { inline.appendChild( entry.getOwnerDocument().importNode(feed((AtomFeed) link.getInlineFeed()), true)); } } entry.appendChild(linkElem); } } private Element entry(final AtomEntry entry) throws ParserConfigurationException { final DocumentBuilder builder = XMLUtils.DOC_BUILDER_FACTORY.newDocumentBuilder(); final Document doc = builder.newDocument(); final Element entryElem = doc.createElement(ODataConstants.ATOM_ELEM_ENTRY); entryElem.setAttribute(XMLConstants.XMLNS_ATTRIBUTE, ODataConstants.NS_ATOM); entryElem.setAttribute(ODataConstants.XMLNS_METADATA, client.getWorkingVersion().getNamespaceMap().get(ODataVersion.NS_METADATA)); entryElem.setAttribute(ODataConstants.XMLNS_DATASERVICES, client.getWorkingVersion().getNamespaceMap().get(ODataVersion.NS_DATASERVICES)); entryElem.setAttribute(ODataConstants.XMLNS_GML, ODataConstants.NS_GML); entryElem.setAttribute(ODataConstants.XMLNS_GEORSS, ODataConstants.NS_GEORSS); if (entry.getBaseURI() != null) { entryElem.setAttribute(ODataConstants.ATTR_XMLBASE, entry.getBaseURI().toASCIIString()); } doc.appendChild(entryElem); final Element category = doc.createElement(ODataConstants.ATOM_ELEM_CATEGORY); category.setAttribute(ODataConstants.ATOM_ATTR_TERM, entry.getType()); category.setAttribute(ODataConstants.ATOM_ATTR_SCHEME, client.getWorkingVersion().getNamespaceMap().get(ODataVersion.NS_SCHEME)); entryElem.appendChild(category); if (StringUtils.isNotBlank(entry.getTitle())) { final Element title = doc.createElement(ODataConstants.ATOM_ELEM_TITLE); title.appendChild(doc.createTextNode(entry.getTitle())); entryElem.appendChild(title); } if (StringUtils.isNotBlank(entry.getSummary())) { final Element summary = doc.createElement(ODataConstants.ATOM_ELEM_SUMMARY); summary.appendChild(doc.createTextNode(entry.getSummary())); entryElem.appendChild(summary); } setLinks(entryElem, entry.getAssociationLinks()); setLinks(entryElem, entry.getNavigationLinks()); setLinks(entryElem, entry.getMediaEditLinks()); final Element content = doc.createElement(ODataConstants.ATOM_ELEM_CONTENT); if (entry.isMediaEntry()) { if (StringUtils.isNotBlank(entry.getMediaContentType())) { content.setAttribute(ODataConstants.ATTR_TYPE, entry.getMediaContentType()); } if (StringUtils.isNotBlank(entry.getMediaContentSource())) { content.setAttribute(ODataConstants.ATOM_ATTR_SRC, entry.getMediaContentSource()); } if (content.getAttributes().getLength() > 0) { entryElem.appendChild(content); } if (entry.getMediaEntryProperties() != null) { entryElem.appendChild(doc.importNode(entry.getMediaEntryProperties(), true)); } } else { content.setAttribute(ODataConstants.ATTR_TYPE, ContentType.APPLICATION_XML.getMimeType()); if (entry.getContent() != null) { content.appendChild(doc.importNode(entry.getContent(), true)); } entryElem.appendChild(content); } return entryElem; } private Element feed(final AtomFeed feed) throws ParserConfigurationException { final DocumentBuilder builder = XMLUtils.DOC_BUILDER_FACTORY.newDocumentBuilder(); final Document doc = builder.newDocument(); final Element feedElem = doc.createElement(ODataConstants.ATOM_ELEM_FEED); feedElem.setAttribute(XMLConstants.XMLNS_ATTRIBUTE, ODataConstants.NS_ATOM); feedElem.setAttribute(ODataConstants.XMLNS_METADATA, client.getWorkingVersion().getNamespaceMap().get(ODataVersion.NS_METADATA)); feedElem.setAttribute(ODataConstants.XMLNS_DATASERVICES, client.getWorkingVersion().getNamespaceMap().get(ODataVersion.NS_DATASERVICES)); feedElem.setAttribute(ODataConstants.XMLNS_GML, ODataConstants.NS_GML); feedElem.setAttribute(ODataConstants.XMLNS_GEORSS, ODataConstants.NS_GEORSS); if (feed.getBaseURI() != null) { feedElem.setAttribute(ODataConstants.ATTR_XMLBASE, feed.getBaseURI().toASCIIString()); } doc.appendChild(feedElem); if (StringUtils.isNotBlank(feed.getTitle())) { final Element title = doc.createElement(ODataConstants.ATOM_ELEM_TITLE); title.appendChild(doc.createTextNode(feed.getTitle())); feedElem.appendChild(title); } if (StringUtils.isNotBlank(feed.getSummary())) { final Element summary = doc.createElement(ODataConstants.ATOM_ELEM_SUMMARY); summary.appendChild(doc.createTextNode(feed.getSummary())); feedElem.appendChild(summary); } for (AtomEntry entry : feed.getEntries()) { feedElem.appendChild(doc.importNode(entry(entry), true)); } return feedElem; } }