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/*
* Copyright (C) 2015 Square, 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.squareup.javapoet;
import java.io.IOException;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.lang.model.element.TypeParameterElement;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.type.TypeVariable;
import static com.squareup.javapoet.Util.checkArgument;
import static com.squareup.javapoet.Util.checkNotNull;
public final class TypeVariableName extends TypeName {
public final String name;
public final List<TypeName> bounds;
private TypeVariableName(String name, List<TypeName> bounds) {
this(name, bounds, new ArrayList<AnnotationSpec>());
}
private TypeVariableName(String name, List<TypeName> bounds, List<AnnotationSpec> annotations) {
super(annotations);
this.name = checkNotNull(name, "name == null");
this.bounds = bounds;
for (TypeName bound : this.bounds) {
checkArgument(!bound.isPrimitive() && bound != VOID, "invalid bound: %s", bound);
}
}
@Override public TypeVariableName annotated(List<AnnotationSpec> annotations) {
return new TypeVariableName(name, bounds, annotations);
}
@Override public TypeName withoutAnnotations() {
return new TypeVariableName(name, bounds);
}
public TypeVariableName withBounds(Type... bounds) {
return withBounds(TypeName.list(bounds));
}
public TypeVariableName withBounds(TypeName... bounds) {
return withBounds(Arrays.asList(bounds));
}
public TypeVariableName withBounds(List<TypeName> bounds) {
ArrayList<TypeName> newBounds = new ArrayList<>();
newBounds.addAll(this.bounds);
newBounds.addAll(bounds);
return new TypeVariableName(name, newBounds, annotations);
}
private static TypeVariableName of(String name, List<TypeName> bounds) {
// Strip java.lang.Object from bounds if it is present.
List<TypeName> boundsNoObject = new ArrayList<>(bounds);
boundsNoObject.remove(OBJECT);
return new TypeVariableName(name, Collections.unmodifiableList(boundsNoObject));
}
@Override CodeWriter emit(CodeWriter out) throws IOException {
return out.emitAndIndent(name);
}
/** Returns type variable named {@code name} without bounds. */
public static TypeVariableName get(String name) {
return TypeVariableName.of(name, Collections.<TypeName>emptyList());
}
/** Returns type variable named {@code name} with {@code bounds}. */
public static TypeVariableName get(String name, TypeName... bounds) {
return TypeVariableName.of(name, Arrays.asList(bounds));
}
/** Returns type variable named {@code name} with {@code bounds}. */
public static TypeVariableName get(String name, Type... bounds) {
return TypeVariableName.of(name, TypeName.list(bounds));
}
/** Returns type variable equivalent to {@code mirror}. */
public static TypeVariableName get(TypeVariable mirror) {
return get((TypeParameterElement) mirror.asElement());
}
/**
* Make a TypeVariableName for the given TypeMirror. This form is used internally to avoid
* infinite recursion in cases like {@code Enum<E extends Enum<E>>}. When we encounter such a
* thing, we will make a TypeVariableName without bounds and add that to the {@code typeVariables}
* map before looking up the bounds. Then if we encounter this TypeVariable again while
* constructing the bounds, we can just return it from the map. And, the code that put the entry
* in {@code variables} will make sure that the bounds are filled in before returning.
*/
static TypeVariableName get(
TypeVariable mirror, Map<TypeParameterElement, TypeVariableName> typeVariables) {
TypeParameterElement element = (TypeParameterElement) mirror.asElement();
TypeVariableName typeVariableName = typeVariables.get(element);
if (typeVariableName == null) {
// Since the bounds field is public, we need to make it an unmodifiableList. But we control
// the List that that wraps, which means we can change it before returning.
List<TypeName> bounds = new ArrayList<>();
List<TypeName> visibleBounds = Collections.unmodifiableList(bounds);
typeVariableName = new TypeVariableName(element.getSimpleName().toString(), visibleBounds);
typeVariables.put(element, typeVariableName);
for (TypeMirror typeMirror : element.getBounds()) {
bounds.add(TypeName.get(typeMirror, typeVariables));
}
bounds.remove(OBJECT);
}
return typeVariableName;
}
/** Returns type variable equivalent to {@code element}. */
public static TypeVariableName get(TypeParameterElement element) {
String name = element.getSimpleName().toString();
List<? extends TypeMirror> boundsMirrors = element.getBounds();
List<TypeName> boundsTypeNames = new ArrayList<>();
for (TypeMirror typeMirror : boundsMirrors) {
boundsTypeNames.add(TypeName.get(typeMirror));
}
return TypeVariableName.of(name, boundsTypeNames);
}
/** Returns type variable equivalent to {@code type}. */
public static TypeVariableName get(java.lang.reflect.TypeVariable<?> type) {
return get(type, new LinkedHashMap<Type, TypeVariableName>());
}
/** @see #get(java.lang.reflect.TypeVariable, Map) */
static TypeVariableName get(java.lang.reflect.TypeVariable<?> type,
Map<Type, TypeVariableName> map) {
TypeVariableName result = map.get(type);
if (result == null) {
List<TypeName> bounds = new ArrayList<>();
List<TypeName> visibleBounds = Collections.unmodifiableList(bounds);
result = new TypeVariableName(type.getName(), visibleBounds);
map.put(type, result);
for (Type bound : type.getBounds()) {
bounds.add(TypeName.get(bound, map));
}
bounds.remove(OBJECT);
}
return result;
}
}
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