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Adapter Pattern
package adapterprj; import java.util.*;
public interface SetInterface {
public boolean insert( Object anObject ); public boolean remove( Object anObject ); public boolean isIn(Object anObject); public boolean isEmpty(); public void clear(); public int count(); public String toString(); public Iterator iterator(); }
package adapterprj;
import java.util.*;
public class PersonSet implements SetInterface {
TreeSet theSet;
// ************************************** /**
*/ public PersonSet() { theSet = new TreeSet(); }
- @param anObject Object
- @return boolean */ public boolean insert(Object anObject) { // Add element only if element not null if (anObject instanceof Person) { Person aPerson = (Person) anObject;
if (!aPerson.isNull()) { return theSet.add(aPerson); } else { return false; } } else { return false; }
- @param anObject Object
- @return boolean */ public boolean remove(Object anObject) { // Add element only if element not null if (anObject instanceof Person) { Person aPerson = (Person) anObject;
// Remove a particular element from set return theSet.remove(aPerson); } else { return false; } }
// ************************************** /**
- @param anObject Object
- @return boolean */ public boolean isIn(Object anObject) { // Add element only if element not null if (anObject instanceof Person) { Person aPerson = (Person) anObject;
return theSet.contains(aPerson); } else { return false; } }
// ************************************** /**
- @return boolean */ public boolean isEmpty() { return theSet.isEmpty(); }
// ************************************** /**
*/ public void clear() { // Remove all elements of set theSet.clear(); }
String tempLast = Common.normalize(aLastname); if (Common.isValidName(tempFirst) && Common.isValidName(tempLast)) { m_firstname = tempFirst; m_lastname = tempLast; } else { m_firstname = Common.NULL_STRING; m_lastname = Common.NULL_STRING; } }
// Extractors // *************************************************** /**
- Get the first name
- @return a String representing first name */ public String getFirstname() { return m_firstname; }
- Get the last name
- @return a String representing last name */ public String getLastname() { return m_lastname; }
/**
- Is firstname and lastname an empty string? */ public boolean isNull() { boolean result; result = (m_firstname == Common.NULL_STRING) && (m_lastname == Common.NULL_STRING); return result; }
// Relational operators // *************************************************** /**
- Determine equality based on both first and last names
- @param aPerson
- @return boolean */ public boolean isEqual(Person aPerson) { return (compareTo(aPerson) == 0); }
/**
- If last names are equal, then base comparison solely on
- the first names
- @param aPerson
- @return boolean */
public boolean isLess(Person aPerson) { return (compareTo(aPerson) < 0); }
- If last names are equal, then base comparison solely on
- the first names
- @param aPerson
- @return boolean */ public boolean isGreater(Person aPerson) { return (compareTo(aPerson) > 0); }
- @return firstname + lastname */ public String toString() { return (m_firstname + " " + m_lastname); }
- Same as isEqual
- @param aPerson
- @return boolean */ public boolean equals(Person aPerson) { return (compareTo(aPerson) == 0); }
if (lastCmp == 0) { return m_firstname.compareToIgnoreCase(aPerson.m_firstname); } else { return lastCmp; } } }
package adapterprj;
public class Common {
// Operations and data that are common to all of the other classes
