add view schedule functionality

Author: YingxuH

src/main/java/model/DeadLineTask.java

@@ -1,6 +1,8 @@
 package model;
 
 import exceptions.NoDescriptionException;
+
+import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -63,6 +65,11 @@ public ArrayList<String> getDetails() {
                 this.by.format(DATE_TIME_FORMAT)));
     }
 
+    @Override
+    public boolean isOnDate(LocalDate targetDate) {
+        return by.toLocalDate().equals(targetDate);
+    }
+
     /**
      * Convert task into a string such that the user can view the details from UI.
      * @return String.

src/main/java/model/EventTask.java

@@ -2,10 +2,10 @@
 
 import exceptions.NoDescriptionException;
 
+import java.time.LocalDate;
+import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.time.LocalDateTime;
-
 
 /**
  * Represents an event task in the inner-task list.
@@ -65,6 +65,11 @@ public String getTaskType() {
         return TASK_TYPE_CHA;
     }
 
+    @Override
+    public boolean isOnDate(LocalDate targetDate) {
+        return at.toLocalDate().equals(targetDate);
+    }
+
     /**
      * Convert task into a string such that the user can view the details from UI.
      * @return String.

src/main/java/model/Task.java

@@ -2,6 +2,7 @@
 
 import exceptions.NoDescriptionException;
 
+import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -80,6 +81,8 @@ public boolean hasKeyWord(String keyWord) {
         return description.toLowerCase().contains(keyWord.toLowerCase());
     }
 
+    public abstract boolean isOnDate(LocalDate targetDate);
+
     /**
      * An abstract method returning an single-character task type.
      */

src/main/java/model/TaskList.java

@@ -1,5 +1,7 @@
 package model;
 
+import java.time.LocalDate;
+
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -17,6 +19,7 @@ public class TaskList implements Iterable<Task> {
     private static final String ECHO_VIEW_TASK_LIST = "Here are the tasks in your list:\n";
     private static final String ECHO_COMPLETE_TASK = "Nice! I've marked this task as done:\n";
     private static final String ECHO_FIND_TASK = "Here are the matching tasks in your list:\n";
+    private static final String ECHO_VIEW_SCHEDULE = "Here are the tasks on Date:";
 
     public TaskList() {
 
@@ -107,6 +110,29 @@ public String findByKeyWord(String keyWord) {
         return matchedTasks.toString();
     }
 
+    public String findTasksOnDate(LocalDate targetDate) {
+        StringBuilder tasksOnDate = new StringBuilder();
+        tasksOnDate.append(ECHO_VIEW_SCHEDULE);
+        tasksOnDate.append(" ");
+        tasksOnDate.append(targetDate);
+        tasksOnDate.append(":\n");
+
+        for (int i = 0; i < this.internalList.size(); i++) {
+            if (this.internalList.get(i) == null) {
+                continue;
+            }
+            Task currentTask = this.internalList.get(i);
+
+            if (currentTask.isOnDate(targetDate)) {
+                tasksOnDate.append(Integer.toString(i + 1));
+                tasksOnDate.append(".");
+                tasksOnDate.append(currentTask.toString());
+                tasksOnDate.append("\n");
+            }
+        }
+        return tasksOnDate.toString();
+    }
+
     /**
      * Converts the task list to a string by looping through the tasks and concatenate
      * all the string representation of tasks.

src/main/java/model/ToDoTask.java

@@ -2,6 +2,8 @@
 
 import exceptions.NoDescriptionException;
 
+import java.time.LocalDate;
+
 /**
  * Represents an todo task in the inner-task list.
  */
@@ -43,6 +45,11 @@ public String getTaskType() {
         return TASK_TYPE_CHA;
     }
 
+    @Override
+    public boolean isOnDate(LocalDate targetDate) {
+        return false;
+    }
+
     /**
      * Convert task into a string such that the user can view the details from UI.
      * @return String.

src/main/java/parser/Parser.java

@@ -25,10 +25,12 @@ public class Parser {
     private static final String DEADLINE_KEY = "(deadline)\\s*(\\S*)\\s*/by\\s*" + DATE_TIME_KEY;
     private static final String EVENT_KEY = "(event)\\s*(\\S*)\\s*/at\\s*" + DATE_TIME_KEY;
     private static final String FIND_KEY = "(find)\\s*(\\S+)";
+    private static final String VIEW_SCHEDULE_KEY = "(view schedule)\\s*" + DATE_TIME_KEY;
 
     private static final int POSITION_TARGET_INDEX = 2;
     private static final int POSITION_DESCRIPTION = 2;
     private static final int POSITION_KEYWORD = 2;
+    private static final int POSITION_VIEW_SCHEDULE_DATE = 2;
     private static final int POSITION_DATE = 3;
     private static final int POSITION_TIME = 4;
 
@@ -38,6 +40,7 @@ public class Parser {
     private static final Pattern DEADLINE_PATTERN = Pattern.compile(DEADLINE_KEY);
     private static final Pattern EVENT_PATTERN = Pattern.compile(EVENT_KEY);
     private static final Pattern FIND_PATTERN = Pattern.compile(FIND_KEY);
+    private static final Pattern VIEW_SCHEDULE_PATTERN = Pattern.compile(VIEW_SCHEDULE_KEY);
 
     /*Handle the difference that java list start from index 0 will human readable list
       starts from 1.*/
@@ -63,6 +66,17 @@ public static LocalDateTime parseDateTime(String dateString, String timeString)
         }
     }
 
+    public static LocalDate parseDate(String dateString) throws
+            IllegalDateTimeFormatException {
+        try {
+            return LocalDate.parse(dateString);
+        } catch (DateTimeParseException dte) {
+            throw new IllegalDateTimeFormatException(dte.getMessage() + '\n');
+        } catch (NullPointerException npe) {
+            throw new IllegalDateTimeFormatException("Oops!!! The date string is missing!\n");
+        }
+    }
+
     /**
      * Parse the indicated position from the input command.
      * @param pattern Java regular expression pattern.
@@ -106,8 +120,12 @@ private LocalDateTime findDateTime(Pattern pattern, String input) throws Illegal
         return parseDateTime(dateString, timeString);
     }
 
-    private static boolean isExitKey(String input) {
-        return EXIT_KEY.equals(input);
+    private LocalDate findDate(Pattern pattern, String input) throws IllegalDateTimeFormatException {
+        Matcher matcher = pattern.matcher(input);
+        matcher.find();
+        String dateString = matcher.group(POSITION_VIEW_SCHEDULE_DATE);
+
+        return parseDate(dateString);
     }
 
     private String findKeyword(Pattern pattern, String input) {
@@ -117,6 +135,10 @@ private String findKeyword(Pattern pattern, String input) {
         return matcher.group(POSITION_KEYWORD);
     }
 
+    private static boolean isExitKey(String input) {
+        return EXIT_KEY.equals(input);
+    }
+
     private static boolean isViewListKey(String input) {
         return VIEW_LIST_KEY.equals(input);
     }
@@ -146,11 +168,16 @@ private static boolean isEventKey(String input) {
         return eventMatcher.find();
     }
 
-    private static boolean isFindKey(String userInput) {
-        Matcher findMatcher = FIND_PATTERN.matcher(userInput);
+    private static boolean isFindKey(String input) {
+        Matcher findMatcher = FIND_PATTERN.matcher(input);
         return findMatcher.find();
     }
 
+    private static boolean isViewScheduleKey(String input) {
+        Matcher viewScheduleMatcher = VIEW_SCHEDULE_PATTERN.matcher(input);
+        return viewScheduleMatcher.find();
+    }
+
     /**
      * Returns corresponding command with the parsed parameters.
      * @param userInput String user input.
@@ -184,6 +211,9 @@ public Command parseCommand(String userInput) throws
         } else if (Parser.isFindKey(userInput)) {
             String keyWord = this.findKeyword(FIND_PATTERN, userInput);
             return new FindCommand(keyWord);
+        } else if (Parser.isViewScheduleKey(userInput)) {
+            LocalDate targetDate = this.findDate(VIEW_SCHEDULE_PATTERN, userInput);
+            return new ViewScheduleCommand(targetDate);
         }
         else {
             throw new NoCommandException("OOPS!!! I'm sorry, but I don't know what that means :-(\n");

src/main/java/parser/ViewScheduleCommand.java

@@ -0,0 +1,15 @@
+package parser;
+
+import java.time.LocalDate;
+
+public class ViewScheduleCommand extends Command{
+    private LocalDate targetDate;
+
+    ViewScheduleCommand(LocalDate targetDate) {
+        this.targetDate = targetDate;
+    }
+
+    public String execute() {
+        return this.taskList.findTasksOnDate(targetDate);
+    }
+}