DeletePersonCommand.java

package seedu.address.logic.commands;

import static java.util.Objects.requireNonNull;
import static seedu.address.logic.parser.CliSyntax.FLAG_PERSON;

import java.util.List;

import seedu.address.commons.core.Messages;
import seedu.address.commons.core.index.Index;
import seedu.address.logic.commands.exceptions.CommandException;
import seedu.address.model.Model;
import seedu.address.model.person.Person;

/**
 * Deletes a person identified using it's displayed index from the address book.
 */
public class DeletePersonCommand extends DeleteCommand {

    public static final String MESSAGE_USAGE = COMMAND_WORD + " " + FLAG_PERSON
        + ": Deletes the person identified by the index number used in the displayed person list.\n"
        + "Parameters: INDEX (must be a positive integer)\n"
        + "Example: " + COMMAND_WORD + " " + FLAG_PERSON + " 1";
    public static final String MESSAGE_DELETE_PERSON_SUCCESS = "Deleted Person: %1$s";

    private final Index targetIndex;
    private Person personToDelete;
    public DeletePersonCommand(Index targetIndex) {
        this.targetIndex = targetIndex;
    }

    @Override
    public CommandResult execute(Model model) throws CommandException {
        requireNonNull(model);
        List<Person> lastShownList = model.getFilteredPersonList();

        if (targetIndex.getZeroBased() >= lastShownList.size()) {
            throw new CommandException(Messages.MESSAGE_INVALID_PERSON_DISPLAYED_INDEX);
        }

        Person personToDelete = lastShownList.get(targetIndex.getZeroBased());
        this.personToDelete = personToDelete;
        model.deletePerson(personToDelete);
        return new CommandResult(String.format(MESSAGE_DELETE_PERSON_SUCCESS, personToDelete));
    }

    @Override
    public boolean equals(Object other) {
        return other == this // short circuit if same object
                || (other instanceof DeletePersonCommand // instanceof handles nulls
                && targetIndex.equals(((DeletePersonCommand) other).targetIndex)); // state check
    }
    @Override
    public String toString() {
        return "Delete '" + personToDelete + "' Command";
    }
}