114 lines
3.3 KiB
Java
114 lines
3.3 KiB
Java
/*
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* Copyright (C) 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Set;
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import java.util.logging.Level;
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/**
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* A map that provides ability to associate handlers for a specific type or all of its sub-types
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*
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* @author Inderjeet Singh
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* @author Joel Leitch
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*
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* @param <T> The handler that will be looked up by type
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*/
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final class ParameterizedTypeHandlerMap<T> {
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private final Map<Type, T> map = new HashMap<Type, T>();
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private boolean modifiable = true;
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public synchronized void register(Type typeOfT, T value) {
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if (!modifiable) {
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throw new IllegalStateException("Attempted to modify an unmodifiable map.");
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}
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if (hasSpecificHandlerFor(typeOfT)) {
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Gson.logger.log(Level.WARNING, "Overriding the existing type handler for " + typeOfT);
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}
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map.put(typeOfT, value);
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}
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public synchronized void registerIfAbsent(ParameterizedTypeHandlerMap<T> other) {
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if (!modifiable) {
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throw new IllegalStateException("Attempted to modify an unmodifiable map.");
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}
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for (Map.Entry<Type, T> entry : other.entrySet()) {
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if (!map.containsKey(entry.getKey())) {
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register(entry.getKey(), entry.getValue());
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}
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}
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}
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public synchronized void makeUnmodifiable() {
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modifiable = false;
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}
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public synchronized T getHandlerFor(Type type) {
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T handler = map.get(type);
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if (handler == null && type instanceof ParameterizedType) {
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// a handler for a non-generic version is registered, so use that
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Type rawType = ((ParameterizedType)type).getRawType();
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handler = map.get(rawType);
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}
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return handler;
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}
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public synchronized boolean hasAnyHandlerFor(Type type) {
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return getHandlerFor(type) != null;
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}
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public synchronized boolean hasSpecificHandlerFor(Type type) {
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return map.containsKey(type);
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}
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public synchronized ParameterizedTypeHandlerMap<T> copyOf() {
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ParameterizedTypeHandlerMap<T> copy = new ParameterizedTypeHandlerMap<T>();
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for (Map.Entry<Type, T> entry : map.entrySet()) {
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copy.register(entry.getKey(), entry.getValue());
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}
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return copy;
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}
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public synchronized Set<Map.Entry<Type, T>> entrySet() {
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return map.entrySet();
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}
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@Override
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public String toString() {
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StringBuilder sb = new StringBuilder("{");
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boolean first = true;
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for (Map.Entry<Type, T> entry : map.entrySet()) {
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if (first) {
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first = false;
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} else {
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sb.append(',');
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}
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sb.append(typeToString(entry.getKey())).append(':');
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sb.append(entry.getValue());
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}
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return sb.toString();
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}
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private String typeToString(Type type) {
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return TypeUtils.toRawClass(type).getSimpleName();
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}
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}
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