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small speed enhancement using a column factory

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This commit is contained in:
Michael Peter Christen 2012-05-17 11:08:48 +02:00
parent d10627d591
commit 6f8a2fef1f
2 changed files with 27 additions and 7 deletions
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22
source/net/yacy/kelondro/index/Column.java
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@ -31,7 +31,7 @@ import java.io.Serializable;
import net.yacy.kelondro.util.kelondroException;
public final class Column implements Serializable {
public final class Column implements Cloneable, Serializable {
private static final long serialVersionUID=6558500565023465301L;
@ -60,7 +60,7 @@ public final class Column implements Serializable {
this.nickname = nickname;
this.description = description;
}
public Column(String celldef) {
// define column with column syntax
// example: <UDate-3>
@ -196,6 +196,24 @@ public final class Column implements Serializable {
}
}
/**
* th clone method is useful to produce a similiar column with a different cell width
* @return the cloned Column
*/
public Object clone() {
return new Column(this.nickname, this.celltype, this.encoder, this.cellwidth, this.description);
}
/**
* a column width may change when the object was not yet used.
* this applies to clones of Column objects which are used as Column producers
* @param cellwidth
*/
public void setCellwidth(int cellwidth) {
assert this.celltype == celltype_string || this.celltype == celltype_binary;
this.cellwidth = cellwidth;
}
@Override
public final String toString() {
final StringBuilder s = new StringBuilder(20);

12
source/net/yacy/kelondro/index/RowCollection.java
View File

@ -169,10 +169,10 @@ public class RowCollection implements Sortable<Row.Entry>, Iterable<Row.Entry>,
return (int) (time / day) - 10957;
}
private static Column exportColumn0, exportColumn1, exportColumn2, exportColumn3, exportColumn4;
private static Column exportColumn0, exportColumn1, exportColumn2, exportColumn3, exportColumn4, collectionColumnProducer;
protected static final long exportOverheadSize = 14;
private static Row exportRow(final int chunkcachelength) {
/*
return new Row(
@ -191,15 +191,17 @@ public class RowCollection implements Sortable<Row.Entry>, Iterable<Row.Entry>,
if (exportColumn2 == null) exportColumn2 = new Column("short lastwrote-2 {b256}");
if (exportColumn3 == null) exportColumn3 = new Column("byte[] orderkey-2");
if (exportColumn4 == null) exportColumn4 = new Column("int orderbound-4 {b256}");
if (collectionColumnProducer == null) collectionColumnProducer = new Column("byte[] collection-1");
/*
* because of a strange bug these objects cannot be initialized as normal
* static final. If I try that, they are not initialized and are assigned null. why?
*/
final StringBuilder colName = new StringBuilder(30);
colName.append("byte[] collection-").append(Integer.toString(chunkcachelength));
Column collectionColumn = (Column) collectionColumnProducer.clone();
collectionColumn.setCellwidth(chunkcachelength);
final Row er = new Row(new Column[]{
exportColumn0, exportColumn1, exportColumn2, exportColumn3, exportColumn4,
new Column(colName.toString())
collectionColumn
},
NaturalOrder.naturalOrder
);