package seedu.task.model.task;

import seedu.task.commons.exceptions.IllegalValueException;

/**
 * Represents a Task's location in KIT. Guarantees: immutable; is valid as
 * declared in {@link #isValidLocation(String)}
 */
public class Location {

    public static final String MESSAGE_LOCATION_CONSTRAINTS = "Task locations can take any values,"
            + " and it should not be blank";
    /*
     * The first character of the location must not be a whitespace, otherwise
     * " " (a blank string) becomes a valid input.
     */
    public static final String LOCATION_VALIDATION_REGEX = "[^\\s].*";
    public static final String DEFAULT_LOCATION = "DEFAULT_LOCATION";
    public final String value;

    /**
     * Validates given location.
     *
     * @throws IllegalValueException
     *             if given location string is invalid.
     */
    public Location(String location) throws IllegalValueException {
        assert location != null;
        if (location.equals(DEFAULT_LOCATION)) {
            this.value = "";
        } else {
            if (!isValidLocation(location)) {
                throw new IllegalValueException(MESSAGE_LOCATION_CONSTRAINTS);
            }
            this.value = location;
        }
    }

    /**
     * Returns true if a given string is a valid task email.
     */
    public static boolean isValidLocation(String test) {
        return test.matches(LOCATION_VALIDATION_REGEX);
    }

    @Override
    public String toString() {
        return value;
    }

    @Override
    public boolean equals(Object other) {
        return other == this // short circuit if same object
                || (other instanceof Location // instanceof handles nulls
                        && this.value.equals(((Location) other).value)); // state
                                                                         // check
    }

    @Override
    public int hashCode() {
        return value.hashCode();
    }

}

package seedu.task.model.task;

import seedu.task.commons.exceptions.IllegalValueException;

/**
 * Represents a Task's location in KIT. Guarantees: immutable; is valid as
 * declared in {@link #isValidLocation(String)}
 */
public class Location {

    public static final String MESSAGE_LOCATION_CONSTRAINTS = "Task locations can take any values,"
            + " and it should not be blank";
    /*
     * The first character of the location must not be a whitespace, otherwise
     * " " (a blank string) becomes a valid input.
     */
    public static final String LOCATION_VALIDATION_REGEX = "[^\\s].*";
    public static final String DEFAULT_LOCATION = "DEFAULT_LOCATION";
    public final String value;

    /**
     * Validates given location.
     *
     * @throws IllegalValueException
     *             if given location string is invalid.
     */
    public Location(String location) throws IllegalValueException {
        assert location != null;
        if (location.equals(DEFAULT_LOCATION) || location.trim().equals("")) {
            this.value = "";
        } else {
            if (!isValidLocation(location)) {
                throw new IllegalValueException(MESSAGE_LOCATION_CONSTRAINTS);
            }
            this.value = location;
        }
    }

    /**
     * Returns true if a given string is a valid task email.
     */
    public static boolean isValidLocation(String test) {
        return test.matches(LOCATION_VALIDATION_REGEX);
    }

    @Override
    public String toString() {
        return value;
    }

    @Override
    public boolean equals(Object other) {
        return other == this // short circuit if same object
                || (other instanceof Location // instanceof handles nulls
                        && this.value.equals(((Location) other).value)); // state
                                                                         // check
    }

    @Override
    public int hashCode() {
        return value.hashCode();
    }

}

fix location if empty