// Copyright 2012 Google Inc. All Rights Reserved.
//
// 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 com.google.collide.client.util.collections;
import com.google.collide.json.client.JsoArray;
import com.google.collide.json.client.JsoStringMap;
import com.google.collide.json.shared.JsonStringMap;
/**
* Implementation with "__proto__" key workaround.
*
* @param <T> type of stored values.
*/
public final class ClientStringMap<T> implements JsonStringMap<T> {
private static final String PROTO_KEY = "__proto__";
private final JsoStringMap<T> delegate = JsoStringMap.create();
private boolean protoFlag;
private T protoValue;
/**
* Convenience factory method.
*/
public static <T> ClientStringMap<T> create() {
return new ClientStringMap<T>();
}
@Override
public T get(String key) {
if (PROTO_KEY.equals(key)) {
return protoValue;
}
return delegate.get(key);
}
@Override
public JsoArray<String> getKeys() {
JsoArray<String> result = delegate.getKeys();
if (protoFlag) {
result.add(PROTO_KEY);
}
return result;
}
@Override
public boolean isEmpty() {
return delegate.isEmpty() && !protoFlag;
}
@Override
public void iterate(IterationCallback<T> tIterationCallback) {
delegate.iterate(tIterationCallback);
if (protoFlag) {
tIterationCallback.onIteration(PROTO_KEY, protoValue);
}
}
@Override
public void put(String key, T value) {
if (PROTO_KEY.equals(key)) {
protoValue = value;
protoFlag = true;
} else {
delegate.put(key, value);
}
}
@Override
public void putAll(JsonStringMap<T> otherMap) {
otherMap.iterate(new IterationCallback<T>() {
@Override
public void onIteration(String key, T value) {
put(key, value);
}
});
}
@Override
public T remove(String key) {
if (PROTO_KEY.equals(key)) {
T result = protoValue;
protoValue = null;
protoFlag = false;
return result;
} else {
return delegate.remove(key);
}
}
@Override
public boolean containsKey(String key) {
if (PROTO_KEY.equals(key)) {
return protoFlag;
}
return delegate.containsKey(key);
}
@Override
public int size() {
int result = delegate.size();
if (protoFlag) {
result++;
}
return result;
}
}