//----------------------------------------------------------------------
// ArrayStringLog.java        by Dale/Joyce/Weems              Chapter 2
//
// Implements StringLogInterface using an array to hold the strings.
//----------------------------------------------------------------------

package StringLog;

public class ArrayStringLog implements StringLogInterface 
{
  protected String name;              // name of this StringLog
  protected String[] log;             // array that holds strings
  protected int lastIndex = -1;       // index of last string in array

  public ArrayStringLog( String name, int maxSize )
  // Precondition:   maxSize > 0
  //
  // Instantiates and returns a reference to an empty StringLog object 
  // with name "name" and room for maxSize strings.
  {
    log = new String[ maxSize ];
    this.name = name;
  }

  public ArrayStringLog( String name ) 
  // Instantiates and returns a reference to an empty StringLog object 
  // with name "name" and room for 100 strings.
  {
    log = new String[ 100 ];
    this.name = name;
  }

  public void insert( String element )
  // Precondition:   This StringLog is not full.
  //
  // Places element into this StringLog.
  {      
    lastIndex++;
    log[ lastIndex ] = element;
  }

  public boolean isFull()
  // Returns true if this StringLog is full, otherwise returns false.
  {              
    if ( lastIndex == ( log.length - 1 ) ) 
      return true;
    else
      return false;
  }
  
  public int size()
  // Returns the number of Strings in this StringLog.
  {
    return ( lastIndex + 1 );
  }
  
  public boolean contains( String element )
  // Returns true if element is in this StringLog,
  // otherwise returns false.
  // Ignores case differences when doing string comparison.
  {                 
    boolean moreToSearch;
    int location = 0;
    boolean found = false;
    moreToSearch = ( location <= lastIndex );

    while ( moreToSearch && !found ) 
    {
      if ( element.equalsIgnoreCase( log[ location ] ) )  // if they match
        found = true;
      else
      {
        location++;
        moreToSearch = ( location <= lastIndex );
      }
    }

   return found;
  }
  
  public void clear()
  // Makes this StringLog empty.
  {                  
    for ( int i = 0; i <= lastIndex; i++ )
      log[ i ] = null;
    lastIndex = -1;
  }

  public String getName()
  // Returns the name of this StringLog.
  {
    return name;
  }

  public String toString()
  // Returns a nicely formatted string representing this StringLog.
  {
    String logString = "Log: " + name + "\n\n";
    
    for ( int i = 0; i <= lastIndex; i++ )
      logString = logString + (i+1) + ". " + log[ i ] + "\n";
      
    return logString;
  }
}