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Java EE 6 example source code file (DemoResourceBean.java)
This example Java EE 6 source code file (DemoResourceBean.java) is included in the DevDaily.com
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The Java EE 6 DemoResourceBean.java source code
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2009 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* 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
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package ezcomp;
import java.util.Collection;
import java.util.ArrayList;
import java.util.List;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ApplicationScoped;
import javax.faces.context.FacesContext;
import javax.faces.FacesException;
import javax.annotation.PostConstruct;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
/**
* This bean is responsible for building the metadata used in generating the
* demo index page.
*/
@ManagedBean(name="demoBean",eager=true)
@ApplicationScoped
public class DemoResourceBean {
/**
* The path and filename to the demo metadata descriptor.
*/
private static final String DEMO_DESCRIPTOR = "/WEB-INF/demo.xml";
/**
* List of <code>DemoBeans for this application instance.
*/
private List<DemoBean> demoBeans;
// ---------------------------------------------------------- Public Methods
/**
* @return a <code>Collection of DemoBeans for this
* application.
*/
public Collection<DemoBean> getDemoBeans() {
return demoBeans;
}
// --------------------------------------------------------- Private Methods
/**
* @return a non-validating, non-namespace aware <code>DocumentBuilder
* @throws Exception if the DocumentBuilder cannot be obtained
*/
private DocumentBuilder getBuilder() throws Exception {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setValidating(false);
dbf.setNamespaceAware(false);
return dbf.newDocumentBuilder();
}
/**
* @return the <code>Document based off the content found within
* {@link #DEMO_DESCRIPTOR}
* @throws Exception if an error occurs parsing {@link #DEMO_DESCRIPTOR}
*/
private Document getDemoMetadata() throws Exception {
FacesContext ctx = FacesContext.getCurrentInstance();
DocumentBuilder builder = getBuilder();
return builder.parse(ctx.getExternalContext().getResourceAsStream(DEMO_DESCRIPTOR));
}
/**
* <p>
* This method is responsible for constructing the <code>DemoBean
* instances based on the parsed content of {@link #DEMO_DESCRIPTOR}.
* </p>
* <p>
* This method will be called by the JSF managed bean facility before the
* bean is automatically pushed to the application scope when the
* application starts.
* </p>
*/
@SuppressWarnings({"UnusedDeclaration"})
@PostConstruct
private void buildDemoMetaData() {
try {
Document d = getDemoMetadata();
ArrayList<DemoBean> beans = new ArrayList();
NodeList demoElements = d.getElementsByTagName("demo");
for (int i = 0, len = demoElements.getLength(); i < len; i++) {
DemoBean b = processDemo(demoElements.item(i));
if (b != null) {
beans.add(b);
}
}
beans.trimToSize();
demoBeans = beans;
} catch (Exception e) {
throw new FacesException("Unable to initialize demo", e);
}
}
/**
* @param demoNode node representing the <demo> element.
* @return a new <code>DemoBean instance based off the provided
* <code>Node and it's children.
*/
private DemoBean processDemo(Node demoNode) {
NodeList children = demoNode.getChildNodes();
String name = null;
String page = null;
ArrayList<DemoSourceInfo> sourceInfo = new ArrayList();
for (int i = 0, len = children.getLength(); i < len; i++) {
Node n = children.item(i);
if ("name".equals(n.getNodeName())) {
name = getNodeText(n);
} else if ("page".equals(n.getNodeName())) {
page = getNodeText(n);
} else if ("sources".equals(n.getNodeName())) {
NodeList sources = n.getChildNodes();
for (int j = 0, jlen = sources.getLength(); j < jlen; j++) {
Node s = sources.item(j);
DemoSourceInfo info = createDemoSourceInfo(s);
if (info != null) {
sourceInfo.add(createDemoSourceInfo(s));
}
}
}
}
sourceInfo.trimToSize();
if (name != null && page != null && !sourceInfo.isEmpty()) {
return new DemoBean(name, page, sourceInfo);
}
return null;
}
/**
* @param sourceInfo node representing the <sources> element.
* @return a new <code>DemoSourceInfo instance based off the provided
* <code>Node and it's children.
*/
private DemoSourceInfo createDemoSourceInfo(Node sourceInfo) {
NodeList children = sourceInfo.getChildNodes();
String label = null;
String path = null;
for (int i = 0, len = children.getLength(); i < len; i++) {
Node n = children.item(i);
if ("label".equals(n.getNodeName())) {
label = getNodeText(n);
} else if ("path".equals(n.getNodeName())) {
path = getNodeText(n);
}
}
if (label != null && path != null) {
return new DemoSourceInfo(label, path);
}
return null;
}
/**
* @param node target <code>Node
* @return the textual value of the <code>Node
*/
private String getNodeText(Node node) {
String res = null;
if (node != null) {
res = node.getTextContent();
if (res != null) {
res = res.trim();
}
}
return ((res != null && res.length() != 0) ? res : null);
}
// ---------------------------------------------------------- Nested Classes
public static final class DemoBean {
private List<DemoSourceInfo> sourceInfo;
private String demoName;
private String page;
DemoBean(String demoName, String page, List<DemoSourceInfo> sourceInfo) {
this.demoName = demoName;
this.page = page;
this.sourceInfo = sourceInfo;
}
// ------------------------------------------------------ Public Methods
public String getDemoName() {
return demoName;
}
public String getPage() {
return page;
}
public List<DemoSourceInfo> getSourceInfo() {
return sourceInfo;
}
} // END DemoBean
public static final class DemoSourceInfo {
private String label;
private String sourceFilePath;
// -------------------------------------------------------- Constructors
DemoSourceInfo(String label, String sourceFilePath) {
this.label = label;
this.sourceFilePath = sourceFilePath;
}
// ------------------------------------------------------ Public Methods
public String getLabel() {
return label;
}
public String getSourceFilePath() {
return sourceFilePath;
}
} // END DemoSourceInfo
}
Other Java EE 6 examples (source code examples)
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