package org.infinispan.tools.jdbc.migrator.marshaller.externalizers;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Set;
import java.util.TreeSet;
import org.infinispan.commons.marshall.AbstractExternalizer;
import org.infinispan.commons.marshall.MarshallUtil;
import org.infinispan.commons.util.Util;
import org.jboss.marshalling.util.IdentityIntMap;
import net.jcip.annotations.Immutable;
/**
* Set externalizer for all set implementations, i.e. HashSet and TreeSet
*
* @author Galder ZamarreƱo
* @since 4.0
*/
@Immutable
public class SetExternalizer extends AbstractExternalizer<Set> {
private static final int HASH_SET = 0;
private static final int TREE_SET = 1;
private final IdentityIntMap<Class<?>> numbers = new IdentityIntMap<>(2);
public SetExternalizer() {
numbers.put(HashSet.class, HASH_SET);
numbers.put(TreeSet.class, TREE_SET);
}
@Override
public void writeObject(ObjectOutput output, Set set) throws IOException {
int number = numbers.get(set.getClass(), -1);
output.writeByte(number);
if (number == TREE_SET)
output.writeObject(((TreeSet) set).comparator());
MarshallUtil.marshallCollection(set, output);
}
@Override
public Set readObject(ObjectInput input) throws IOException, ClassNotFoundException {
int magicNumber = input.readUnsignedByte();
switch (magicNumber) {
case HASH_SET:
return MarshallUtil.unmarshallCollection(input, s -> new HashSet<>());
case TREE_SET:
Comparator<Object> comparator = (Comparator<Object>) input.readObject();
return MarshallUtil.unmarshallCollection(input, s -> new TreeSet<>(comparator));
default:
throw new IllegalStateException("Unknown Set type: " + magicNumber);
}
}
@Override
public Integer getId() {
return LegacyIds.JDK_SETS;
}
@Override
public Set<Class<? extends Set>> getTypeClasses() {
return Util.asSet(HashSet.class, TreeSet.class);
}
}