Java tutorial
/* * Copyright 2011 JBoss Inc * * Licensed 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.jbpm.form.builder.services.impl.fs; import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.Reader; import java.net.URISyntaxException; import java.net.URL; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Properties; import org.apache.commons.io.FileUtils; import org.apache.commons.io.IOUtils; import org.apache.commons.vfs.AllFileSelector; import org.apache.commons.vfs.FileObject; import org.apache.commons.vfs.VFS; import org.jbpm.form.builder.services.api.MenuServiceException; import org.jbpm.form.builder.services.impl.base.BaseMenuService; import org.jbpm.form.builder.services.model.forms.FormEncodingException; import org.jbpm.form.builder.services.model.forms.FormEncodingFactory; import org.jbpm.form.builder.services.model.forms.FormRepresentationDecoder; import org.jbpm.form.builder.services.model.forms.FormRepresentationEncoder; import org.jbpm.form.builder.services.model.menu.MenuItemDescription; import org.jbpm.form.builder.services.model.menu.MenuOptionDescription; import org.jbpm.form.builder.services.model.menu.ValidationDescription; import com.google.gson.Gson; import com.google.gson.reflect.TypeToken; public class FSMenuService extends BaseMenuService { @Override public List<MenuOptionDescription> listOptions() throws MenuServiceException { Gson gson = new Gson(); List<MenuOptionDescription> retval = new ArrayList<MenuOptionDescription>(); try { URL url = asURL("/menuOptions.json"); retval = gson.fromJson(createReader(url), new TypeToken<List<MenuOptionDescription>>() { }.getType()); } catch (URISyntaxException e) { throw new MenuServiceException("Problem finding menu options json file", e); } catch (FileNotFoundException e) { throw new MenuServiceException("No menu options json file found", e); } catch (Exception e) { throw new MenuServiceException("Unexpected error", e); } return retval; } @Override public Map<String, List<MenuItemDescription>> listMenuItems() throws MenuServiceException { Map<String, List<MenuItemDescription>> retval = null; try { FormRepresentationDecoder decoder = FormEncodingFactory.getDecoder(); URL url = asURL("/menuItems.json"); String json = readURL(url); retval = decoder.decodeMenuItemsMap(json); } catch (FormEncodingException e) { throw new MenuServiceException("Problem parsing menu items json file", e); } catch (URISyntaxException e) { throw new MenuServiceException("Problem finding menu items json file", e); } catch (FileNotFoundException e) { throw new MenuServiceException("No menu items json file found", e); } catch (IOException e) { throw new MenuServiceException("Problem reading menu items json file", e); } catch (Exception e) { throw new MenuServiceException("Unexpected error", e); } return retval; } @Override public List<ValidationDescription> listValidations() throws MenuServiceException { Gson gson = new Gson(); List<ValidationDescription> retval = null; try { URL url = asURL("/validations.json"); retval = gson.fromJson(createReader(url), new TypeToken<List<ValidationDescription>>() { }.getType()); } catch (URISyntaxException e) { throw new MenuServiceException("Problem finding validations json file", e); } catch (FileNotFoundException e) { throw new MenuServiceException("No validations json file found", e); } catch (Exception e) { throw new MenuServiceException("Unexpected error", e); } return retval; } @Override public void saveMenuItem(String groupName, MenuItemDescription item) throws MenuServiceException { Map<String, List<MenuItemDescription>> items = listMenuItems(); addToMap(groupName, item, items); writeMenuItems(items); } @Override public void deleteMenuItem(String groupName, MenuItemDescription item) throws MenuServiceException { Map<String, List<MenuItemDescription>> items = listMenuItems(); removeFromMap(groupName, item, items); writeMenuItems(items); } @Override public Map<String, String> getFormBuilderProperties() throws MenuServiceException { InputStream input = getClass().getResourceAsStream("/FormBuilder.properties"); Properties props = new Properties(); try { props.load(input); } catch (IOException e) { throw new MenuServiceException("Couldn't read FormBuilder.properties", e); } Map<String, String> retval = new HashMap<String, String>(); for (Map.Entry<Object, Object> entry : props.entrySet()) { retval.put(entry.getKey().toString(), entry.getValue().toString()); } return retval; } private void writeMenuItems(Map<String, List<MenuItemDescription>> items) throws MenuServiceException { try { FormRepresentationEncoder encoder = FormEncodingFactory.getEncoder(); String json = encoder.encodeMenuItemsMap(items); URL url = asURL("/menuItems.json"); writeToURL(url, json); } catch (FormEncodingException e) { throw new MenuServiceException("Problem transforming menu items to json", e); } catch (URISyntaxException e) { throw new MenuServiceException("Problem finding menu items json file", e); } catch (FileNotFoundException e) { throw new MenuServiceException("No menu items json file found", e); } catch (IOException e) { throw new MenuServiceException("Problem writing menu items json file", e); } catch (Exception e) { throw new MenuServiceException("Unexpected error", e); } } protected void writeToURL(URL url, String json) throws FileNotFoundException, IOException { if (url.toExternalForm().startsWith("vfs")) { FileObject to = VFS.getManager().resolveFile(url.toExternalForm()); File tmpFile = File.createTempFile("xxFilexx", ".json"); FileUtils.writeStringToFile(tmpFile, json); FileObject from = VFS.getManager().toFileObject(tmpFile); to.copyFrom(from, new AllFileSelector()); FileUtils.deleteQuietly(tmpFile); } else { FileUtils.writeStringToFile(FileUtils.toFile(url), json); } } protected URL asURL(String path) throws URISyntaxException { return getClass().getResource(path); } protected Reader createReader(URL url) throws FileNotFoundException, IOException { return new InputStreamReader(url.openStream()); } protected String readURL(URL url) throws FileNotFoundException, IOException { if (url.toExternalForm().startsWith("vfs")) { FileObject from = VFS.getManager().resolveFile(url.toExternalForm()); return IOUtils.toString(from.getContent().getInputStream()); } else { return FileUtils.readFileToString(FileUtils.toFile(url)); } } }