package com.google.gson.internal;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Collection;
import java.util.EnumSet;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Queue;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentNavigableMap;
import java.util.concurrent.ConcurrentSkipListMap;
import com.google.gson.InstanceCreator;
import com.google.gson.JsonIOException;
import com.google.gson.internal.reflect.ReflectionAccessor;
import com.google.gson.reflect.TypeToken;
public final class ConstructorConstructor {
private final Map<Type, InstanceCreator<?>> instanceCreators;
private final ReflectionAccessor accessor = ReflectionAccessor.getInstance();
public ConstructorConstructor(Map<Type, InstanceCreator<?>> instanceCreators) {
this.instanceCreators = instanceCreators;
}
public <T> ObjectConstructor<T> get(TypeToken<T> typeToken) {
final Type type = typeToken.getType();
final Class<? super T> rawType = typeToken.getRawType();
@SuppressWarnings("unchecked")
final InstanceCreator<T> typeCreator = (InstanceCreator<T>) instanceCreators.get(type);
if (typeCreator != null) {
return new ObjectConstructor<T>() {
@Override public T construct() {
return typeCreator.createInstance(type);
}
};
}
@SuppressWarnings("unchecked")
final InstanceCreator<T> rawTypeCreator =
(InstanceCreator<T>) instanceCreators.get(rawType);
if (rawTypeCreator != null) {
return new ObjectConstructor<T>() {
@Override public T construct() {
return rawTypeCreator.createInstance(type);
}
};
}
ObjectConstructor<T> defaultConstructor = newDefaultConstructor(rawType);
if (defaultConstructor != null) {
return defaultConstructor;
}
ObjectConstructor<T> defaultImplementation = newDefaultImplementationConstructor(type, rawType);
if (defaultImplementation != null) {
return defaultImplementation;
}
return newUnsafeAllocator(type, rawType);
}
private <T> ObjectConstructor<T> newDefaultConstructor(Class<? super T> rawType) {
try {
final Constructor<? super T> constructor = rawType.getDeclaredConstructor();
if (!constructor.isAccessible()) {
accessor.makeAccessible(constructor);
}
return new ObjectConstructor<T>() {
@SuppressWarnings("unchecked")
@Override public T construct() {
try {
Object[] args = null;
return (T) constructor.newInstance(args);
} catch (InstantiationException e) {
throw new RuntimeException("Failed to invoke " + constructor + " with no args", e);
} catch (InvocationTargetException e) {
throw new RuntimeException("Failed to invoke " + constructor + " with no args",
e.getTargetException());
} catch (IllegalAccessException e) {
throw new AssertionError(e);
}
}
};
} catch (NoSuchMethodException e) {
return null;
}
}
@SuppressWarnings("unchecked")
private <T> ObjectConstructor<T> newDefaultImplementationConstructor(
final Type type, Class<? super T> rawType) {
if (Collection.class.isAssignableFrom(rawType)) {
if (SortedSet.class.isAssignableFrom(rawType)) {
return new ObjectConstructor<T>() {
@Override public T construct() {
return (T) new TreeSet<Object>();
}
};
} else if (EnumSet.class.isAssignableFrom(rawType)) {
return new ObjectConstructor<T>() {
@SuppressWarnings("rawtypes")
@Override public T construct() {
if (type instanceof ParameterizedType) {
Type elementType = ((ParameterizedType) type).getActualTypeArguments()[0];
if (elementType instanceof Class) {
return (T) EnumSet.noneOf((Class)elementType);
} else {
throw new JsonIOException("Invalid EnumSet type: " + type.toString());
}
} else {
throw new JsonIOException("Invalid EnumSet type: " + type.toString());
}
}
};
} else if (Set.class.isAssignableFrom(rawType)) {
return new ObjectConstructor<T>() {
@Override public T construct() {
return (T) new LinkedHashSet<Object>();
}
};
} else if (Queue.class.isAssignableFrom(rawType)) {
return new ObjectConstructor<T>() {
@Override public T construct() {
return (T) new ArrayDeque<Object>();
}
};
} else {
return new ObjectConstructor<T>() {
@Override public T construct() {
return (T) new ArrayList<Object>();
}
};
}
}
if (Map.class.isAssignableFrom(rawType)) {
if (ConcurrentNavigableMap.class.isAssignableFrom(rawType)) {
return new ObjectConstructor<T>() {
@Override public T construct() {
return (T) new ConcurrentSkipListMap<Object, Object>();
}
};
} else if (ConcurrentMap.class.isAssignableFrom(rawType)) {
return new ObjectConstructor<T>() {
@Override public T construct() {
return (T) new ConcurrentHashMap<Object, Object>();
}
};
} else if (SortedMap.class.isAssignableFrom(rawType)) {
return new ObjectConstructor<T>() {
@Override public T construct() {
return (T) new TreeMap<Object, Object>();
}
};
} else if (type instanceof ParameterizedType && !(String.class.isAssignableFrom(
TypeToken.get(((ParameterizedType) type).getActualTypeArguments()[0]).getRawType()))) {
return new ObjectConstructor<T>() {
@Override public T construct() {
return (T) new LinkedHashMap<Object, Object>();
}
};
} else {
return new ObjectConstructor<T>() {
@Override public T construct() {
return (T) new LinkedTreeMap<String, Object>();
}
};
}
}
return null;
}
private <T> ObjectConstructor<T> newUnsafeAllocator(
final Type type, final Class<? super T> rawType) {
return new ObjectConstructor<T>() {
private final UnsafeAllocator unsafeAllocator = UnsafeAllocator.create();
@SuppressWarnings("unchecked")
@Override public T construct() {
try {
Object newInstance = unsafeAllocator.newInstance(rawType);
return (T) newInstance;
} catch (Exception e) {
throw new RuntimeException(("Unable to invoke no-args constructor for " + type + ". "
+ "Registering an InstanceCreator with Gson for this type may fix this problem."), e);
}
}
};
}
@Override public String toString() {
return instanceCreators.toString();
}
}