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The messaging and data conversion protocol between Java and DolphinDB server
package com.xxdb.data;
import java.io.IOException;
import java.util.HashSet;
import java.util.Iterator;
import com.xxdb.io.ExtendedDataInput;
import com.xxdb.io.ExtendedDataOutput;
/**
*
* Corresponds to DolphinDB set object
*
*/
public class BasicSet extends AbstractEntity implements Set {
private java.util.Set set;
private DATA_TYPE keyType;
public BasicSet(DATA_TYPE keyType, ExtendedDataInput in) throws IOException{
this.keyType = keyType;
BasicEntityFactory factory = new BasicEntityFactory();
DATA_TYPE[] types = DATA_TYPE.values();
//read key vector
short flag = in.readShort();
int form = flag>>8;
int type = flag & 0xff;
if(form != DATA_FORM.DF_VECTOR.ordinal())
throw new IOException("The form of set keys must be vector");
if(type <0 || type >= types.length)
throw new IOException("Invalid key type: " + type);
Vector keys = (Vector)factory.createEntity(DATA_FORM.DF_VECTOR, types[type], in);
int size = keys.rows();
int capacity = (int)(size/0.75);
set = new HashSet(capacity);
for(int i=0; i= DATA_TYPE.DT_FUNCTIONDEF.ordinal())
throw new IllegalArgumentException("Invalid keyType: " + keyType.name());
this.keyType = keyType;
set = new HashSet();
}
public BasicSet(DATA_TYPE keyType){
this(keyType, 0);
}
@Override
public DATA_FORM getDataForm() {
return DATA_FORM.DF_SET;
}
@Override
public DATA_CATEGORY getDataCategory() {
return getDataCategory(keyType);
}
@Override
public DATA_TYPE getDataType() {
return keyType;
}
@Override
public int rows() {
return set.size();
}
@Override
public int columns() {
return 1;
}
public Vector keys(){
return keys(set.size());
}
private Vector keys(int top){
BasicEntityFactory factory = new BasicEntityFactory();
int size = Math.min(top, set.size());
Vector keys = (Vector)factory.createVectorWithDefaultValue(keyType, size);
Iterator it = set.iterator();
int count = 0;
try{
while(count