/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.isis.runtimes.dflt.runtime.persistence.adaptermanager.internal;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.apache.commons.collections.map.IdentityMap;
import org.apache.log4j.Logger;
import org.apache.isis.core.commons.debug.DebugBuilder;
import org.apache.isis.core.commons.lang.ToString;
import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
/**
* TODO: an alternative might be to use {@link IdentityMap}.
*/
public class PojoAdapterHashMap implements PojoAdapterMap {
private static class IdentityHashKey {
private final Object pojo;
public IdentityHashKey(final Object pojo) {
this.pojo = pojo;
}
@Override
public int hashCode() {
return System.identityHashCode(pojo);
}
@Override
public boolean equals(final Object obj) {
return obj == this || (obj instanceof IdentityHashKey && ((IdentityHashKey) obj).pojo == pojo);
}
}
private static final Logger LOG = Logger.getLogger(PojoAdapterHashMap.class);
public static final int DEFAULT_POJO_ADAPTER_MAP_SIZE = 10;
protected final Map<Object, ObjectAdapter> adapterByPojoMap;
// ///////////////////////////////////////////////////////////////////////////
// Constructors, finalize
// ///////////////////////////////////////////////////////////////////////////
public PojoAdapterHashMap() {
this(DEFAULT_POJO_ADAPTER_MAP_SIZE);
}
public PojoAdapterHashMap(final int capacity) {
adapterByPojoMap = new HashMap<Object, ObjectAdapter>(capacity);
// adapterByPojoMap = new IdentityMap(capacity);
}
@Override
protected void finalize() throws Throwable {
super.finalize();
LOG.debug("finalizing hash of pojos");
}
// ///////////////////////////////////////////////////////////////////////////
// open, close
// ///////////////////////////////////////////////////////////////////////////
@Override
public void open() {
// nothing to do
}
@Override
public void close() {
LOG.debug("close");
adapterByPojoMap.clear();
}
// ///////////////////////////////////////////////////////////////////////////
// reset
// ///////////////////////////////////////////////////////////////////////////
@Override
public void reset() {
LOG.debug("reset");
for (final Iterator<Map.Entry<Object, ObjectAdapter>> iterator = adapterByPojoMap.entrySet().iterator(); iterator.hasNext();) {
final Map.Entry<Object, ObjectAdapter> entry = iterator.next();
final ObjectAdapter adapter = entry.getValue();
if (!adapter.getSpecification().isService()) {
iterator.remove();
}
}
}
// ///////////////////////////////////////////////////////////////////////////
// add, remove
// ///////////////////////////////////////////////////////////////////////////
@Override
public void add(final Object pojo, final ObjectAdapter adapter) {
adapterByPojoMap.put(key(pojo), adapter);
LOG.debug("add adapter: #" + Long.toHexString(pojo.hashCode()) + " -> #" + Long.toHexString(adapter.hashCode()));
// log at end so that if toString needs adapters they're in maps.
if (adapter.getResolveState().isResolved()) {
if (LOG.isDebugEnabled()) {
LOG.debug("add " + new ToString(pojo) + " as " + adapter);
}
}
}
@Override
public void remove(final ObjectAdapter object) {
LOG.debug("remove adapater: " + object);
adapterByPojoMap.remove(key(object.getObject()));
}
// ///////////////////////////////////////////////////////////////////////////
// contains
// ///////////////////////////////////////////////////////////////////////////
@Override
public boolean containsPojo(final Object pojo) {
return adapterByPojoMap.containsKey(key(pojo));
}
// ///////////////////////////////////////////////////////////////////////////
// get
// ///////////////////////////////////////////////////////////////////////////
@Override
public ObjectAdapter getAdapter(final Object pojo) {
return adapterByPojoMap.get(key(pojo));
}
// ///////////////////////////////////////////////////////////////////////////
// elements
// ///////////////////////////////////////////////////////////////////////////
@Override
public Iterator<ObjectAdapter> iterator() {
return adapterByPojoMap.values().iterator();
}
private Object key(final Object pojo) {
return new IdentityHashKey(pojo);
}
// ///////////////////////////////////////////////////////////////////////////
// Debugging
// ///////////////////////////////////////////////////////////////////////////
@Override
public void debugData(final DebugBuilder debug) {
int count = 0;
for (final Object pojo : adapterByPojoMap.keySet()) {
final ObjectAdapter object = adapterByPojoMap.get(pojo);
debug.append(count++ + 1, 5);
debug.append(" '");
debug.append(pojo.toString(), 50);
debug.append("' ");
debug.appendln(object.toString());
}
}
@Override
public String debugTitle() {
return "POJO Adapter Hashtable";
}
}