/**
* Copyright 2011-2014 Asakusa Framework Team.
*
* 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.asakusafw.compiler.operator.model;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.element.TypeParameterElement;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.type.TypeVariable;
import javax.lang.model.util.ElementFilter;
import javax.lang.model.util.Elements;
import javax.lang.model.util.Types;
import com.asakusafw.compiler.common.Precondition;
import com.asakusafw.compiler.operator.DataModelMirror;
import com.asakusafw.compiler.operator.OperatorCompilingEnvironment;
import com.asakusafw.utils.collections.Lists;
import com.asakusafw.utils.collections.Sets;
/**
* Default implementation of a partial {@link DataModelMirror}.
* @since 0.2.0
*/
final class PartialDataModelMirror implements DataModelMirror {
private final OperatorCompilingEnvironment environment;
final TypeVariable type;
private Map<String, PropertyMirror> properties;
/**
* Creates a new instance.
* @param environment the current compilation environment
* @param type the target data model type
* @throws IllegalArgumentException if some parameters were {@code null}
*/
public PartialDataModelMirror(OperatorCompilingEnvironment environment, TypeVariable type) {
if (environment == null) {
throw new IllegalArgumentException("environment must not be null"); //$NON-NLS-1$
}
if (type == null) {
throw new IllegalArgumentException("type must not be null"); //$NON-NLS-1$
}
this.environment = environment;
this.type = type;
}
@Override
public Kind getKind() {
return Kind.PARTIAL;
}
@Override
public boolean isSame(DataModelMirror other) {
Precondition.checkMustNotBeNull(other, "other"); //$NON-NLS-1$
if (other instanceof PartialDataModelMirror) {
PartialDataModelMirror that = (PartialDataModelMirror) other;
return environment.getTypeUtils().isSameType(this.type, that.type);
}
return false;
}
@Override
public boolean canInvoke(DataModelMirror other) {
Precondition.checkMustNotBeNull(other, "other"); //$NON-NLS-1$
if (other instanceof ConcreteDataModelMirror) {
ConcreteDataModelMirror that = (ConcreteDataModelMirror) other;
return environment.getTypeUtils().isSubtype(this.type, that.type);
}
if (other instanceof PartialDataModelMirror) {
PartialDataModelMirror that = (PartialDataModelMirror) other;
return environment.getTypeUtils().isSubtype(this.type, that.type.getUpperBound());
}
return false;
}
@Override
public boolean canContain(DataModelMirror other) {
Precondition.checkMustNotBeNull(other, "other"); //$NON-NLS-1$
if (other instanceof PartialDataModelMirror) {
PartialDataModelMirror that = (PartialDataModelMirror) other;
Types typeUtils = environment.getTypeUtils();
return typeUtils.isSubtype(this.type, that.type.getUpperBound())
&& typeUtils.isSubtype(that.type.getLowerBound(), this.type);
}
return false;
}
@Override
public PropertyMirror findProperty(String name) {
Precondition.checkMustNotBeNull(name, "name"); //$NON-NLS-1$
String normalized = Util.normalize(name);
synchronized (this) {
if (properties == null) {
properties = buildProperties();
}
return properties.get(normalized);
}
}
private Map<String, PropertyMirror> buildProperties() {
Map<String, PropertyMirror> results = new LinkedHashMap<String, PropertyMirror>();
Elements elementUtils = environment.getElementUtils();
for (TypeElement element : collectUpperBounds()) {
for (ExecutableElement method : ElementFilter.methodsIn(elementUtils.getAllMembers(element))) {
PropertyMirror property = Util.toProperty(method);
if (property != null) {
results.put(property.getName(), property);
}
}
}
return results;
}
private List<TypeElement> collectUpperBounds() {
LinkedList<TypeMirror> works = new LinkedList<TypeMirror>();
works.add(type);
Set<TypeMirror> saw = Sets.create();
List<TypeElement> types = Lists.create();
int countDown = 100; // avoid infinite loop
while (works.isEmpty() == false && --countDown >= 0) {
TypeMirror target = works.removeFirst();
if (saw.contains(target)) {
continue;
}
saw.add(target);
Element element = environment.getTypeUtils().asElement(target);
if (element == null) {
continue;
}
switch (element.getKind()) {
case CLASS:
case INTERFACE:
types.add((TypeElement) element);
break;
case TYPE_PARAMETER:
works.addAll(((TypeParameterElement) element).getBounds());
break;
default:
// ignore other types
continue;
}
}
return types;
}
@Override
public String toString() {
return type.toString();
}
}