package org.infinispan.marshall.exts;
import org.infinispan.commons.equivalence.Equivalence;
import org.infinispan.commons.equivalence.EquivalentHashMap;
import org.infinispan.commons.marshall.AbstractExternalizer;
import org.infinispan.commons.marshall.MarshallUtil;
import org.infinispan.commons.util.FastCopyHashMap;
import org.infinispan.commons.util.Util;
import org.infinispan.marshall.core.Ids;
import org.jboss.marshalling.util.IdentityIntMap;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
/**
* Map externalizer for all map implementations except immutable maps and singleton maps, i.e. FastCopyHashMap, HashMap,
* TreeMap.
*
* @author Galder Zamarreño
* @since 4.0
*/
public class MapExternalizer extends AbstractExternalizer<Map> {
private static final int HASHMAP = 0;
private static final int TREEMAP = 1;
private static final int FASTCOPYHASHMAP = 2;
private static final int EQUIVALENTHASHMAP = 3;
private final IdentityIntMap<Class<?>> numbers = new IdentityIntMap<Class<?>>(4);
public MapExternalizer() {
numbers.put(HashMap.class, HASHMAP);
numbers.put(TreeMap.class, TREEMAP);
numbers.put(FastCopyHashMap.class, FASTCOPYHASHMAP);
numbers.put(EquivalentHashMap.class, EQUIVALENTHASHMAP);
}
@Override
public void writeObject(ObjectOutput output, Map map) throws IOException {
int number = numbers.get(map.getClass(), -1);
output.write(number);
switch (number) {
case EQUIVALENTHASHMAP:
EquivalentHashMap equivalentMap = (EquivalentHashMap) map;
output.writeObject(equivalentMap.getKeyEquivalence());
output.writeObject(equivalentMap.getValueEquivalence());
default:
break;
}
MarshallUtil.marshallMap(map, output);
}
@Override
public Map readObject(ObjectInput input) throws IOException, ClassNotFoundException {
int magicNumber = input.readUnsignedByte();
Map subject = null;
switch (magicNumber) {
case HASHMAP:
subject = new HashMap();
break;
case TREEMAP:
subject = new TreeMap();
break;
case FASTCOPYHASHMAP:
subject = new FastCopyHashMap();
break;
case EQUIVALENTHASHMAP:
Equivalence<Object> keyEq = (Equivalence<Object>) input.readObject();
Equivalence<Object> valueEq = (Equivalence<Object>) input.readObject();
subject = new EquivalentHashMap(keyEq, valueEq);
break;
}
MarshallUtil.unmarshallMap(subject, input);
return subject;
}
@Override
public Integer getId() {
return Ids.MAPS;
}
@Override
public Set<Class<? extends Map>> getTypeClasses() {
return Util.<Class<? extends Map>>asSet(
HashMap.class, TreeMap.class, FastCopyHashMap.class, EquivalentHashMap.class);
}
}