listing16-05_recordstorereader.java_creatingtoomanytemporayobjects

来自「着几乎所有智能机厂商都将有自己配套的App Store,甚至并非智能手机制造商的」· JAVA_CREATINGTOOMANYTEMPORAYOBJECTS 代码 · 共 50 行

// Listing 16-5. Creating Many Temporary Objects by Filtering and Sorting a Record Store



import javax.microedition.rms.*;

import de.enough.polish.util.ArrayList;


public class RecordStoreReader
implements RecordFilter, RecordComparator
{

	private final ArrayList list;
	private final Object condition;

	public RecordStoreReader( Object condition )
	throws RecordStoreException
	{
		this.condition = condition;
		this.list = new ArrayList();
		// open record store:
		RecordStore store = RecordStore.openRecordStore( "store", false );
		// enumerate the record sets:
		RecordEnumeration enumeration =
			store.enumerateRecords( this, this, false );

		while ( enumeration.hasNextElement() ) {
			MyRecordData data = new MyRecordData( ennumeration.nextRecord() );
			this.list.add( data );
		}
		store.closeRecordStore();
	}

	public ArrayList getRecords() {
		return this.list;
	}

	public int compare( byte[] rec1, byte[] rec2 ) {
		MyRecordData data1 = new MyRecordData( rec1 );
		MyRecordData data2 = new MyRecordData( rec2 );
		return data1.compare( data2 );
	}

	public boolean matches( byte[] candidate ) {
		MyRecordData data = new MyRecordData( candidate );
		return data.conditionFulfilled( this.condition );
	}
}