/*
* Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* Licensed 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.drools.core.base;
import org.drools.core.spi.GlobalResolver;
import org.kie.api.runtime.Globals;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
public class MapGlobalResolver
implements
GlobalResolver, Globals,
Externalizable {
private static final long serialVersionUID = 510l;
private Map<String,Object> map;
private Globals delegate;
public MapGlobalResolver() {
this.map = new ConcurrentHashMap<String, Object>();
}
public MapGlobalResolver(Map<String, Object> map) {
if (map instanceof ConcurrentHashMap) {
this.map = map;
} else {
this.map = new ConcurrentHashMap<String, Object>();
this.map.putAll(map);
}
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
map = (Map)in.readObject();
delegate = ( Globals ) in.readObject();
}
public void writeExternal(ObjectOutput out) throws IOException {
out.writeObject( map );
out.writeObject( delegate );
}
public void setDelegate(Globals delegate) {
this.delegate = delegate;
}
public Collection<String> getGlobalKeys() {
if ( delegate == null ) {
return Collections.unmodifiableCollection(map.keySet());
} else if ( map.isEmpty() ) {
return Collections.unmodifiableCollection( ((MapGlobalResolver) delegate).map.keySet() );
} else {
Collection<String> combined = new HashSet<String>( map.keySet() );
combined.addAll( ((MapGlobalResolver) delegate).map.keySet() );
return Collections.unmodifiableCollection( combined );
}
}
public Object get(String identifier) {
return resolveGlobal( identifier );
}
public Object resolveGlobal(String identifier) {
Object object = this.map.get( identifier );
if ( object == null && this.delegate != null ) {
object = this.delegate.get( identifier );
}
return object;
}
public void set(String identifier, Object value) {
setGlobal( identifier, value );
}
public void setGlobal(String identifier, Object value) {
this.map.put( identifier,
value );
}
public void removeGlobal(String identifier) {
this.map.remove( identifier );
}
public Entry<String, Object>[] getGlobals() {
if ( delegate == null ) {
return (Entry<String, Object>[]) this.map.entrySet().toArray(new Entry[this.map.size()]);
} else if ( map.isEmpty() ) {
Map<String,Object> delegateMap = ((MapGlobalResolver) delegate).map;
return (Entry<String, Object>[]) delegateMap.entrySet().toArray(new Entry[delegateMap.size()]);
} else {
Map<String,Object> combined = new HashMap<String,Object>( ((MapGlobalResolver) delegate).map );
combined.putAll( map );
return (Entry<String, Object>[]) combined.entrySet().toArray(new Entry[combined.size()]);
}
}
public GlobalResolver clone() {
Map<String,Object> clone = new HashMap<String,Object>();
for ( Entry<String,Object> entry : getGlobals() ) {
clone.put( entry.getKey(), entry.getValue() );
}
return new MapGlobalResolver( clone );
}
@Override
public String toString() {
return "MapGlobalResolver [map=" + map + ", delegate=" + delegate + "]";
}
public void clear() {
map.clear();
}
}