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package com.facebook.presto.jdbc.internal.jol.layouters;
import com.facebook.presto.jdbc.internal.jol.datamodel.DataModel;
import com.facebook.presto.jdbc.internal.jol.info.ClassData;
import com.facebook.presto.jdbc.internal.jol.info.ClassLayout;
import com.facebook.presto.jdbc.internal.jol.info.FieldData;
import com.facebook.presto.jdbc.internal.jol.info.FieldLayout;
import java.util.SortedSet;
import java.util.TreeSet;
/**
* Layouter which packs all the fields together, regardless of the alignment.
*
* @author Aleksey Shipilev
*/
public class RawLayouter implements Layouter {
private final DataModel model;
public RawLayouter(DataModel model) {
this.model = model;
}
@Override
public ClassLayout layout(ClassData data) {
SortedSet<FieldLayout> result = new TreeSet<FieldLayout>();
if (data.isArray()) {
// special case of arrays
int base = model.headerSize() + model.sizeOf("int");
int scale = model.sizeOf(data.arrayComponentType());
int instanceSize = base + (data.arrayLength()) * scale;
result.add(new FieldLayout(FieldData.create(data.arrayClass(), "length", "int"), model.headerSize(), model.sizeOf("int")));
result.add(new FieldLayout(FieldData.create(data.arrayClass(), "<elements>", data.arrayComponentType()), base, scale * data.arrayLength()));
return new ClassLayout(data, result, model.headerSize(), instanceSize, false);
}
int offset = model.headerSize();
for (FieldData f : data.fields()) {
int size = model.sizeOf(f.typeClass());
result.add(new FieldLayout(f, offset, size));
offset += size;
}
if (result.isEmpty()) {
return new ClassLayout(data, result, model.headerSize(), model.headerSize(), false);
} else {
FieldLayout f = result.last();
return new ClassLayout(data, result, model.headerSize(), f.offset() + f.size(), false);
}
}
@Override
public String toString() {
return "Raw data (" + model + ")";
}
}