package seedu.ezdo.logic.commands;

import java.util.Optional;
import java.util.Set;

import seedu.ezdo.model.todo.Priority;
import seedu.ezdo.model.todo.TaskDate;

/**
 * Finds and lists all tasks in ezDo whose name contains any of the argument keywords.
 * Keyword matching is case sensitive.
 */
public class FindCommand extends Command {

    public static final String COMMAND_WORD = "find";
    public static final String SHORT_COMMAND_WORD = "f";

    public static final String MESSAGE_USAGE = COMMAND_WORD + ": Finds all tasks whose names contain any of "
            + "the specified keywords (case-sensitive) and displays them as a list with index numbers.\n"
            + "Parameters: KEYWORD [MORE_KEYWORDS]...\n"
            + "Example: " + COMMAND_WORD + " buy milk clean p/3";

    private final Set<String> keywords;
    private final Optional<Priority> priorityToMatch;
    private final Optional<TaskDate> startDateToMatch;
    private final Optional<TaskDate> dueDateToMatch;
    private final Set<String> tagsToMatch;

    public FindCommand(Set<String> keywords, Optional<Priority> priorityToMatch, Optional<TaskDate> startDateToMatch,
                       Optional<TaskDate> dueDateToMatch, Set<String> tagsToMatch) {
        this.keywords = keywords;
        this.priorityToMatch = priorityToMatch;
        this.startDateToMatch = startDateToMatch;
        this.dueDateToMatch = dueDateToMatch;
        this.tagsToMatch = tagsToMatch;
    }

    @Override
    public CommandResult execute() {
        model.updateFilteredTaskList(keywords, priorityToMatch, startDateToMatch, dueDateToMatch, tagsToMatch);
        return new CommandResult(getMessageForTaskListShownSummary(model.getFilteredTaskList().size()));
    }

}

package seedu.ezdo.logic.commands;

import java.util.Optional;
import java.util.Set;

import seedu.ezdo.model.todo.Priority;
import seedu.ezdo.model.todo.TaskDate;

/**
 * Finds and lists all tasks in ezDo whose name contains any of the argument
 * keywords. Keyword matching is case sensitive.
 */
public class FindCommand extends Command {

    public static final String COMMAND_WORD = "find";
    public static final String SHORT_COMMAND_WORD = "f";

    public static final String MESSAGE_USAGE = COMMAND_WORD + ": Finds all tasks whose names contain any of "
            + "the specified keywords (case-sensitive) and displays them as a list with index numbers.\n"
            + "Parameters: KEYWORD [MORE_KEYWORDS]...\n" + "Example: " + COMMAND_WORD + " buy milk clean p/3";

    private final Set<String> keywords;
    private final Optional<Priority> priorityToMatch;
    private final Optional<TaskDate> startDateToMatch;
    private final Optional<TaskDate> dueDateToMatch;
    private final Set<String> tagsToMatch;

    public FindCommand(Set<String> keywords, Optional<Priority> priorityToMatch, Optional<TaskDate> startDateToMatch,
            Optional<TaskDate> dueDateToMatch, Set<String> tagsToMatch) {
        this.keywords = keywords;
        this.priorityToMatch = priorityToMatch;
        this.startDateToMatch = startDateToMatch;
        this.dueDateToMatch = dueDateToMatch;
        this.tagsToMatch = tagsToMatch;
    }

    @Override
    public CommandResult execute() {
        model.updateFilteredTaskList(keywords, priorityToMatch, startDateToMatch, dueDateToMatch, tagsToMatch);
        return new CommandResult(getMessageForTaskListShownSummary(model.getFilteredTaskList().size()));
    }

}

Improve readability of class description