Java tutorial
/* * Copyright 2016 Anton Tananaev (anton@traccar.org) * Copyright 2016 Andrey Kunitsyn (andrey@traccar.org) * * 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.traccar.web; import java.beans.Introspector; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.util.Arrays; import java.util.Collection; import java.util.Comparator; import java.util.Date; import java.util.Map; import java.util.SortedSet; import java.util.TreeSet; import com.fasterxml.jackson.core.JsonProcessingException; import org.joda.time.DateTime; import org.joda.time.format.DateTimeFormatter; import org.joda.time.format.ISODateTimeFormat; import org.traccar.Context; import org.traccar.helper.Log; public class CsvBuilder { private static final String LINE_ENDING = "\r\n"; private static final String SEPARATOR = ";"; private static final DateTimeFormatter DATE_FORMAT = ISODateTimeFormat.dateTime(); private StringBuilder builder = new StringBuilder(); private void addLineEnding() { builder.append(LINE_ENDING); } private void addSeparator() { builder.append(SEPARATOR); } private SortedSet<Method> getSortedMethods(Object object) { Method[] methodArray = object.getClass().getMethods(); SortedSet<Method> methods = new TreeSet<Method>(new Comparator<Method>() { @Override public int compare(Method m1, Method m2) { if (m1.getName().equals("getAttributes") && !m1.getName().equals(m2.getName())) { return 1; } if (m2.getName().equals("getAttributes") && !m1.getName().equals(m2.getName())) { return -1; } return m1.getName().compareTo(m2.getName()); } }); methods.addAll(Arrays.asList(methodArray)); return methods; } public void addLine(Object object) { SortedSet<Method> methods = getSortedMethods(object); for (Method method : methods) { if (method.getName().startsWith("get") && method.getParameterTypes().length == 0) { try { if (method.getReturnType().equals(boolean.class)) { builder.append((Boolean) method.invoke(object)); addSeparator(); } else if (method.getReturnType().equals(int.class)) { builder.append((Integer) method.invoke(object)); addSeparator(); } else if (method.getReturnType().equals(long.class)) { builder.append((Long) method.invoke(object)); addSeparator(); } else if (method.getReturnType().equals(double.class)) { builder.append((Double) method.invoke(object)); addSeparator(); } else if (method.getReturnType().equals(String.class)) { builder.append((String) method.invoke(object)); addSeparator(); } else if (method.getReturnType().equals(Date.class)) { Date value = (Date) method.invoke(object); builder.append(DATE_FORMAT.print(new DateTime(value))); addSeparator(); } else if (method.getReturnType().equals(Map.class)) { Map value = (Map) method.invoke(object); if (value != null) { try { String map = Context.getObjectMapper().writeValueAsString(value); map = map.replaceAll("[\\{\\}\"]", ""); map = map.replaceAll(",", " "); builder.append(map); addSeparator(); } catch (JsonProcessingException e) { Log.warning(e); } } } } catch (IllegalAccessException | InvocationTargetException error) { Log.warning(error); } } } addLineEnding(); } public void addHeaderLine(Object object) { SortedSet<Method> methods = getSortedMethods(object); for (Method method : methods) { if (method.getName().startsWith("get") && method.getParameterTypes().length == 0) { String name = Introspector.decapitalize(method.getName().substring(3)); if (!name.equals("class")) { builder.append(name); addSeparator(); } } } addLineEnding(); } public void addArray(Collection<?> array) { for (Object object : array) { switch (object.getClass().getSimpleName().toLowerCase()) { case "string": builder.append(object.toString()); addLineEnding(); break; case "long": builder.append((long) object); addLineEnding(); break; case "double": builder.append((double) object); addLineEnding(); break; case "boolean": builder.append((boolean) object); addLineEnding(); break; default: addLine(object); break; } } } public String build() { return builder.toString(); } }