Java tutorial
/******************************************************************************* * Copyright (c) 2014 OpenLegacy Inc. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * OpenLegacy Inc. - initial API and implementation *******************************************************************************/ package org.openlegacy.designtime.newproject; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.openlegacy.designtime.PreferencesConstants; import org.openlegacy.designtime.newproject.model.ProjectProvider; import org.openlegacy.designtime.newproject.model.ProjectTheme; import org.openlegacy.designtime.newproject.model.ProjectType; import org.openlegacy.exceptions.OpenLegacyException; import org.openlegacy.utils.XmlSerializationUtil; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.net.URL; import java.net.URLConnection; import java.text.MessageFormat; import java.util.ArrayList; import java.util.List; import javax.xml.bind.JAXBException; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlElements; import javax.xml.bind.annotation.XmlRootElement; /** * Retrieves metadata * */ public class NewProjectMetadataRetriever { private final static Log logger = LogFactory.getLog(NewProjectMetadataRetriever.class); @XmlRootElement(name = "project-types") private static class ProjectTypeStore { private List<ProjectType> projectTypes; @XmlElements({ @XmlElement(name = "project-type", type = ProjectType.class) }) public List<ProjectType> getProjectTypes() { return projectTypes; } @SuppressWarnings("unused") public void setProjectTypes(List<ProjectType> projectTypes) { this.projectTypes = projectTypes; } } @XmlRootElement(name = "providers") private static class ProjectProviderStore { private List<ProjectProvider> providers; @XmlElements({ @XmlElement(name = "provider", type = ProjectProvider.class) }) public List<ProjectProvider> getProviders() { return providers; } @SuppressWarnings("unused") public void setProviders(List<ProjectProvider> providers) { this.providers = providers; } } @XmlRootElement(name = "themes") private static class ProjectThemeStore { private List<ProjectTheme> themes; @XmlElements({ @XmlElement(name = "theme", type = ProjectTheme.class) }) public List<ProjectTheme> getThemes() { return themes; } @SuppressWarnings("unused") public void setThemes(List<ProjectTheme> themes) { this.themes = themes; } } private static final String RESOURCE_XML_PATH = "/templates/xml"; private static final String RESOURCE_THEME_IMAGES_PATH = "/templates/theme-images"; private static final String ONLINE_XML_FOLDER = "xml"; private static final String ONLINE_THEME_IMAGES_FOLDER = "theme-images"; private ProjectTypeStore projectTypeStore = null; private ProjectProviderStore projectProviderStore = null; private ProjectThemeStore projectThemeStore = null; private String templatesUrl = null; private boolean isRetrievedOnline = false; private ITemplateFetcher templateFetcher; public NewProjectMetadataRetriever(String templatesUrl) { setTemplatesUrl(templatesUrl); } public void retrieveMetadata() throws OpenLegacyException, JAXBException, IOException { try { this.fetchStoresOnline(); this.isRetrievedOnline = true; this.templateFetcher = new OnlineTemplateFetcher(this.templatesUrl); } catch (Exception e) { logger.warn("Cannot retrieve metadata online", e); this.fetchStores(); this.isRetrievedOnline = false; this.templateFetcher = new ResourceTemplateFetcher(); } } public List<ProjectType> getProjectTypes() { if (this.projectTypeStore == null) { return new ArrayList<ProjectType>(); } return this.projectTypeStore.getProjectTypes(); } public List<ProjectProvider> getProviders() { if (this.projectProviderStore == null) { return new ArrayList<ProjectProvider>(); } return this.projectProviderStore.getProviders(); } public List<ProjectTheme> getThemes() { if (this.projectThemeStore == null) { return new ArrayList<ProjectTheme>(); } return this.projectThemeStore.getThemes(); } public void setTemplatesUrl(String templatesUrl) { this.templatesUrl = templatesUrl; } public boolean isRetrievedOnline() { return isRetrievedOnline; } public String getTemplatesUrl() { return this.templatesUrl; } public ITemplateFetcher getTemplateFetcher() { return templateFetcher; } private void fetchStoresOnline() throws IOException, JAXBException, OpenLegacyException { this.projectTypeStore = this.fetchStoreOnline(ProjectTypeStore.class, PreferencesConstants.PROJECT_TYPES_FILENAME); this.projectProviderStore = this.fetchStoreOnline(ProjectProviderStore.class, PreferencesConstants.PROJECT_PROVIDERS_FILENAME); this.projectThemeStore = this.fetchStoreOnline(ProjectThemeStore.class, PreferencesConstants.PROJECT_THEMES_FILENAME); this.fetchThemeImagesOnline(); if ((this.projectTypeStore.getProjectTypes() == null) || (this.projectProviderStore.getProviders() == null) || (this.projectThemeStore.getThemes() == null)) { throw new OpenLegacyException("Cannot retrieve metadata online from " + this.templatesUrl); } } private void fetchStores() throws JAXBException, IOException, OpenLegacyException { this.projectTypeStore = this.fetchStore(ProjectTypeStore.class, PreferencesConstants.PROJECT_TYPES_FILENAME); this.projectProviderStore = this.fetchStore(ProjectProviderStore.class, PreferencesConstants.PROJECT_PROVIDERS_FILENAME); this.projectThemeStore = this.fetchStore(ProjectThemeStore.class, PreferencesConstants.PROJECT_THEMES_FILENAME); this.fetchThemeImages(); if ((this.projectTypeStore.getProjectTypes() == null) || (this.projectProviderStore.getProviders() == null) || (this.projectThemeStore.getThemes() == null)) { throw new OpenLegacyException("Cannot retrieve metadata from resources"); } } private <P> P fetchStoreOnline(Class<P> rootClass, String filename) throws IOException, JAXBException { InputStream in = getUrlConnectionInputStream( MessageFormat.format("{0}/{1}/{2}", this.templatesUrl, ONLINE_XML_FOLDER, filename)); P store = XmlSerializationUtil.deserialize(rootClass, in); in.close(); return store; } private byte[] fetchImageOnline(String imageFile) throws IOException { InputStream in = getUrlConnectionInputStream( MessageFormat.format("{0}/{1}/{2}", this.templatesUrl, ONLINE_THEME_IMAGES_FOLDER, imageFile)); return getImageData(in); } private void fetchThemeImagesOnline() throws IOException, NullPointerException { for (ProjectTheme theme : this.projectThemeStore.getThemes()) { theme.setImageData(this.fetchImageOnline(theme.getImageFile())); } } private <P> P fetchStore(Class<P> rootClass, String filename) throws JAXBException, IOException { InputStream in = getClass() .getResourceAsStream(MessageFormat.format("{0}/{1}", RESOURCE_XML_PATH, filename)); P store = XmlSerializationUtil.deserialize(rootClass, in); in.close(); return store; } private byte[] fetchImage(String imageFile) throws IOException { InputStream in = getClass() .getResourceAsStream(MessageFormat.format("{0}/{1}", RESOURCE_THEME_IMAGES_PATH, imageFile)); return getImageData(in); } private void fetchThemeImages() throws IOException, NullPointerException { for (ProjectTheme theme : this.projectThemeStore.getThemes()) { theme.setImageData(this.fetchImage(theme.getImageFile())); } } private static InputStream getUrlConnectionInputStream(String urlPath) throws IOException { URL url = new URL(urlPath); URLConnection con = url.openConnection(); con.setDoInput(true); con.setDoOutput(false); con.connect(); return con.getInputStream(); } private static byte[] getImageData(InputStream in) throws IOException { ByteArrayOutputStream out = new ByteArrayOutputStream(); byte[] buff = new byte[1024]; int n = 0; while ((n = in.read(buff)) != -1) { out.write(buff, 0, n); } out.close(); in.close(); return out.toByteArray(); } }