/*
 * Copyright (C) 2008 Google Inc.
 *
 * 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.inject.internal;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.inject.Binding;
import com.google.inject.Key;
import com.google.inject.Scope;
import com.google.inject.TypeLiteral;
import com.google.inject.spi.ModuleAnnotatedMethodScannerBinding;
import com.google.inject.spi.ProvisionListenerBinding;
import com.google.inject.spi.ScopeBinding;
import com.google.inject.spi.TypeConverterBinding;
import com.google.inject.spi.TypeListenerBinding;
import java.lang.annotation.Annotation;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;

Author:jessewilson@google.com (Jesse Wilson)
/** @author jessewilson@google.com (Jesse Wilson) */
final class InheritingState implements State { private final State parent; // Must be a linked hashmap in order to preserve order of bindings in Modules. private final Map<Key<?>, Binding<?>> explicitBindingsMutable = Maps.newLinkedHashMap(); private final Map<Key<?>, Binding<?>> explicitBindings = Collections.unmodifiableMap(explicitBindingsMutable); private final Map<Class<? extends Annotation>, ScopeBinding> scopes = Maps.newHashMap(); private final List<TypeConverterBinding> converters = Lists.newArrayList(); /*if[AOP]*/ private final List<MethodAspect> methodAspects = Lists.newArrayList(); /*end[AOP]*/ private final List<TypeListenerBinding> typeListenerBindings = Lists.newArrayList(); private final List<ProvisionListenerBinding> provisionListenerBindings = Lists.newArrayList(); private final List<ModuleAnnotatedMethodScannerBinding> scannerBindings = Lists.newArrayList(); private final WeakKeySet blacklistedKeys; private final Object lock; InheritingState(State parent) { this.parent = checkNotNull(parent, "parent"); this.lock = (parent == State.NONE) ? this : parent.lock(); this.blacklistedKeys = new WeakKeySet(lock); } @Override public State parent() { return parent; } @Override @SuppressWarnings("unchecked") // we only put in BindingImpls that match their key types public <T> BindingImpl<T> getExplicitBinding(Key<T> key) { Binding<?> binding = explicitBindings.get(key); return binding != null ? (BindingImpl<T>) binding : parent.getExplicitBinding(key); } @Override public Map<Key<?>, Binding<?>> getExplicitBindingsThisLevel() { return explicitBindings; } @Override public void putBinding(Key<?> key, BindingImpl<?> binding) { explicitBindingsMutable.put(key, binding); } @Override public ScopeBinding getScopeBinding(Class<? extends Annotation> annotationType) { ScopeBinding scopeBinding = scopes.get(annotationType); return scopeBinding != null ? scopeBinding : parent.getScopeBinding(annotationType); } @Override public void putScopeBinding(Class<? extends Annotation> annotationType, ScopeBinding scope) { scopes.put(annotationType, scope); } @Override public Iterable<TypeConverterBinding> getConvertersThisLevel() { return converters; } @Override public void addConverter(TypeConverterBinding typeConverterBinding) { converters.add(typeConverterBinding); } @Override public TypeConverterBinding getConverter( String stringValue, TypeLiteral<?> type, Errors errors, Object source) { TypeConverterBinding matchingConverter = null; for (State s = this; s != State.NONE; s = s.parent()) { for (TypeConverterBinding converter : s.getConvertersThisLevel()) { if (converter.getTypeMatcher().matches(type)) { if (matchingConverter != null) { errors.ambiguousTypeConversion(stringValue, source, type, matchingConverter, converter); } matchingConverter = converter; } } } return matchingConverter; } /*if[AOP]*/ @Override public void addMethodAspect(MethodAspect methodAspect) { methodAspects.add(methodAspect); } @Override public ImmutableList<MethodAspect> getMethodAspects() { return new ImmutableList.Builder<MethodAspect>() .addAll(parent.getMethodAspects()) .addAll(methodAspects) .build(); } /*end[AOP]*/ @Override public void addTypeListener(TypeListenerBinding listenerBinding) { typeListenerBindings.add(listenerBinding); } @Override public List<TypeListenerBinding> getTypeListenerBindings() { List<TypeListenerBinding> parentBindings = parent.getTypeListenerBindings(); List<TypeListenerBinding> result = Lists.newArrayListWithCapacity(parentBindings.size() + typeListenerBindings.size()); result.addAll(parentBindings); result.addAll(typeListenerBindings); return result; } @Override public void addProvisionListener(ProvisionListenerBinding listenerBinding) { provisionListenerBindings.add(listenerBinding); } @Override public List<ProvisionListenerBinding> getProvisionListenerBindings() { List<ProvisionListenerBinding> parentBindings = parent.getProvisionListenerBindings(); List<ProvisionListenerBinding> result = Lists.newArrayListWithCapacity(parentBindings.size() + provisionListenerBindings.size()); result.addAll(parentBindings); result.addAll(provisionListenerBindings); return result; } @Override public void addScanner(ModuleAnnotatedMethodScannerBinding scanner) { scannerBindings.add(scanner); } @Override public List<ModuleAnnotatedMethodScannerBinding> getScannerBindings() { List<ModuleAnnotatedMethodScannerBinding> parentBindings = parent.getScannerBindings(); List<ModuleAnnotatedMethodScannerBinding> result = Lists.newArrayListWithCapacity(parentBindings.size() + scannerBindings.size()); result.addAll(parentBindings); result.addAll(scannerBindings); return result; } @Override public void blacklist(Key<?> key, State state, Object source) { parent.blacklist(key, state, source); blacklistedKeys.add(key, state, source); } @Override public boolean isBlacklisted(Key<?> key) { return blacklistedKeys.contains(key); } @Override public Set<Object> getSourcesForBlacklistedKey(Key<?> key) { return blacklistedKeys.getSources(key); } @Override public Object lock() { return lock; } @Override public Map<Class<? extends Annotation>, Scope> getScopes() { ImmutableMap.Builder<Class<? extends Annotation>, Scope> builder = ImmutableMap.builder(); for (Map.Entry<Class<? extends Annotation>, ScopeBinding> entry : scopes.entrySet()) { builder.put(entry.getKey(), entry.getValue().getScope()); } return builder.build(); } }