package com.alvazan.orm.layer5.query;
import com.alvazan.orm.api.z5api.IndexColumnInfo;
import com.alvazan.orm.api.z8spi.action.IndexColumn;
import com.alvazan.orm.api.z8spi.conv.Precondition;
import com.alvazan.orm.api.z8spi.iter.AbstractCursor;
import com.alvazan.orm.api.z8spi.iter.StringLocal;
import com.alvazan.orm.api.z8spi.iter.AbstractCursor.Holder;
import com.alvazan.orm.api.z8spi.iter.DirectCursor;
import com.alvazan.orm.api.z8spi.meta.DboColumnMeta;
import com.alvazan.orm.api.z8spi.meta.ViewInfo;
public class CursorSimpleTranslator implements DirectCursor<IndexColumnInfo> {
private AbstractCursor<IndexColumn> cursor;
private ViewInfo viewInfo;
private DboColumnMeta colMeta;
public CursorSimpleTranslator(ViewInfo viewInfo, DboColumnMeta info, AbstractCursor<IndexColumn> scan) {
Precondition.check(viewInfo, "viewInfo");
Precondition.check(scan, "scan");
this.viewInfo = viewInfo;
this.cursor = scan;
this.colMeta = info;
}
@Override
public String toString() {
String tabs = StringLocal.getAndAdd();
String retVal = "CursorSimpleTranslator["+tabs+cursor+tabs+"view="+viewInfo+tabs+"]";
StringLocal.set(tabs.length());
return retVal;
}
@Override
public void beforeFirst() {
cursor.beforeFirst();
}
@Override
public void afterLast() {
cursor.afterLast();
}
@Override
public Holder<IndexColumnInfo> nextImpl() {
Holder<IndexColumn> holder = cursor.nextImpl();
if(holder == null)
return null;
IndexColumn indCol = holder.getValue();
if(indCol == null)
return new Holder<IndexColumnInfo>(null);
IndexColumnInfo info = new IndexColumnInfo();
info.putIndexNode(viewInfo, indCol, colMeta);
return new Holder<IndexColumnInfo>(info);
}
@Override
public Holder<IndexColumnInfo> previousImpl() {
Holder<IndexColumn> holder = cursor.previousImpl();
if(holder == null)
return null;
IndexColumn indCol = holder.getValue();
if(indCol == null)
return new Holder<IndexColumnInfo>(null);
IndexColumnInfo info = new IndexColumnInfo();
info.putIndexNode(viewInfo, indCol, colMeta);
return new Holder<IndexColumnInfo>(info);
}
}