package library.holdings;

public class HoldingImpl implements Holding, Comparable {
    private String title;

    public HoldingImpl(String title) {
	setTitle(title);
    }

    public void setTitle(String title) {
	if (title == null)
	    throw new IllegalArgumentException("null title");
	this.title = title;
    }

    public String getTitle() {
	return title;
    }

    public String toString() {
	return "title: " + title;
    }

    public boolean equals (Object rhs) {
	if (rhs instanceof HoldingImpl) {
	    HoldingImpl h = (HoldingImpl)rhs;
	    return title.equals(h.title);
	}
	return false;
    }

    public int compareTo(Object rhs) {
	HoldingImpl h = (HoldingImpl)rhs;
	return title.compareTo(h.title);
    }
}