package com.alvazan.orm.layer3.typed;
import java.util.Iterator;
import com.alvazan.orm.api.z5api.IndexColumnInfo;
import com.alvazan.orm.api.z5api.IndexColumnInfo.Wrapper;
import com.alvazan.orm.api.z8spi.action.IndexColumn;
import com.alvazan.orm.api.z8spi.conv.Precondition;
import com.alvazan.orm.api.z8spi.iter.AbstractCursor.Holder;
import com.alvazan.orm.api.z8spi.iter.AbstractIterator;
import com.alvazan.orm.api.z8spi.iter.DirectCursor;
import com.alvazan.orm.api.z8spi.meta.ViewInfo;
public class IterableCursorProxy implements Iterable<byte[]> {
private DirectCursor<IndexColumnInfo> cursor;
private ViewInfo view;
public IterableCursorProxy(ViewInfo view, DirectCursor<IndexColumnInfo> indice) {
Precondition.check(view, "view");
Precondition.check(indice, "indice");
this.cursor = indice;
this.view = view;
}
@Override
public Iterator<byte[]> iterator() {
cursor.beforeFirst();
return new IteratorCursorProxy(view, cursor);
}
private static class IteratorCursorProxy extends AbstractIterator<byte[]> {
private DirectCursor<IndexColumnInfo> cursor;
private ViewInfo view;
public IteratorCursorProxy(ViewInfo view, DirectCursor<IndexColumnInfo> cursor2) {
this.view = view;
this.cursor = cursor2;
}
@Override
public IterHolder<byte[]> nextImpl() {
Holder<IndexColumnInfo> next = cursor.nextImpl();
if(next == null)
return null;
IndexColumnInfo info = next.getValue();
Wrapper wrapper = info.getIndexNode(view);
IndexColumn indNode = wrapper.getCol();
byte[] key = indNode.getPrimaryKey();
if(key == null)
throw new IllegalArgumentException("key was null, index data seems corrupt on view="+view+" col="
+wrapper.getColMeta()+" some value is tied to a null primary key. Should" +
" never happen even in face of eventual consistent, should never happen");
return new IterHolder<byte[]>(key);
}
}
}