/**
* Copyright 2011-2017 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.dmdl.semantics;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.function.UnaryOperator;
import java.util.stream.Collectors;
import com.asakusafw.dmdl.model.AstAttribute;
import com.asakusafw.dmdl.model.AstDescription;
import com.asakusafw.dmdl.model.AstNode;
import com.asakusafw.dmdl.model.AstSimpleName;
import com.asakusafw.utils.collections.Lists;
/**
* Represents a reference of properties.
* @since 0.9.2
*/
public class PropertyReferenceDeclaration implements MemberDeclaration {
private final AstNode originalAst;
private final ModelSymbol owner;
private final AstSimpleName name;
private final Type referentType;
private final ReferenceContainer<?> reference;
private final AstDescription description;
private final List<AstAttribute> attributes;
private final TraitContainer traits = new TraitContainer();
/**
* Creates a new instance.
* @param owner the owner symbol
* @param originalAst the original AST, or {@code null} if this is an ad-hoc element
* @param name the name of this reference
* @param referentType the type of referent properties
* @param reference the reference container
* @param description the description of this reference, or {@code null} if unknown
* @param attributes the attributes of this reference
* @throws IllegalArgumentException if some parameters were {@code null}
*/
public PropertyReferenceDeclaration(
AstNode originalAst,
ModelSymbol owner,
AstSimpleName name,
Type referentType,
ReferenceContainer<?> reference,
AstDescription description,
List<? extends AstAttribute> attributes) {
if (owner == null) {
throw new IllegalArgumentException("owner must not be null"); //$NON-NLS-1$
}
if (name == null) {
throw new IllegalArgumentException("name must not be null"); //$NON-NLS-1$
}
if (referentType == null) {
throw new IllegalArgumentException("referentType must not be null"); //$NON-NLS-1$
}
if (reference == null) {
throw new IllegalArgumentException("reference must not be null"); //$NON-NLS-1$
}
if (attributes == null) {
throw new IllegalArgumentException("attributes must not be null"); //$NON-NLS-1$
}
this.originalAst = originalAst;
this.owner = owner;
this.name = name;
this.referentType = referentType;
this.reference = reference;
this.description = description;
this.attributes = Lists.freeze(attributes);
}
@Override
public AstNode getOriginalAst() {
return originalAst;
}
@Override
public AstSimpleName getName() {
return name;
}
/**
* Returns the type of each referent property.
* @return the referent type
*/
public Type getType() {
return referentType;
}
/**
* Returns the reference.
* @return the reference
*/
public ReferenceContainer<?> getReference() {
return reference;
}
@Override
public AstDescription getDescription() {
return description;
}
@Override
public List<AstAttribute> getAttributes() {
return attributes;
}
@Override
public ModelSymbol getOwner() {
return owner;
}
@Override
public <T extends Trait<T>> T getTrait(Class<T> kind) {
return traits.get(kind);
}
@Override
public <T extends Trait<T>> void putTrait(Class<T> kind, T trait) {
traits.put(kind, trait);
}
@Override
public String toString() {
return MessageFormat.format(
"{0}.{1} : {2}", //$NON-NLS-1$
owner,
name,
reference.getKind().getTypeName(referentType));
}
/**
* Returns an instance for the target references.
* @param symbols the references
* @return the instance
*/
public static ReferenceList container(List<? extends PropertySymbol> symbols) {
return new ReferenceList(Collections.unmodifiableList(new ArrayList<>(symbols)));
}
/**
* Returns an instance for the target references.
* @param symbols the references
* @return the instance
*/
public static ReferenceMap container(Map<String, ? extends PropertySymbol> symbols) {
return new ReferenceMap(Collections.unmodifiableMap(new LinkedHashMap<>(symbols)));
}
/**
* Returns a stub instance.
* @param kind the container kind
* @return the instance
*/
public static ReferenceContainer<?> stub(ReferenceKind kind) {
switch (kind) {
case LIST:
return new ReferenceList(null);
case MAP:
return new ReferenceMap(null);
default:
throw new AssertionError(kind);
}
}
/**
* Represents a reference kind.
* @since 0.9.2
*/
public enum ReferenceKind {
/**
* Refers to list of properties.
* @see ReferenceList
*/
LIST("'{'{0}'}'"), //$NON-NLS-1$
/**
* Refers to association list of properties.
* @see ReferenceMap
*/
MAP("'{:'{0}'}'"), //$NON-NLS-1$
;
private final String pattern;
ReferenceKind(String pattern) {
this.pattern = pattern;
}
String getTypeName(Type type) {
return MessageFormat.format(pattern, type);
}
}
/**
* Represents a reference container.
* @param <E> the entity type
* @since 0.9.2
*/
public interface ReferenceContainer<E> {
/**
* Returns the kind of this container.
* @return the kind
*/
ReferenceKind getKind();
/**
* Returns whether or not this container is a stub.
* @return {@code true} if this is a stub, otherwise {@code false}
*/
default boolean isStub() {
return getEntity().isPresent() == false;
}
/**
* Returns the container entity.
* @return the container entity, or {@code empty} if this container is a stub
*/
Optional<E> getEntity();
/**
* Returns the referred symbols.
* @return the referred symbols
*/
List<PropertySymbol> getAllReferences();
/**
* Returns the mapped container.
* @param mapper the symbol mapper
* @return the mapped container
*/
ReferenceContainer<E> remap(UnaryOperator<PropertySymbol> mapper);
/**
* Returns the entity as {@link List}.
* @return the symbol list
* @throws IllegalStateException if this is not a list
*/
default List<PropertySymbol> asList() {
throw new IllegalStateException();
}
/**
* Returns the entity as {@link Map}.
* @return the symbol map
* @throws IllegalStateException if this is not a map
*/
default Map<String, PropertySymbol> asMap() {
throw new IllegalStateException();
}
}
private abstract static class AbstractReferenceContainer<E> implements ReferenceContainer<E> {
private final ReferenceKind kind;
private final E entity;
AbstractReferenceContainer(ReferenceKind kind, E entity) {
this.kind = kind;
this.entity = entity;
}
@Override
public ReferenceKind getKind() {
return kind;
}
@Override
public Optional<E> getEntity() {
return Optional.ofNullable(entity);
}
@Override
public String toString() {
return String.valueOf(entity);
}
}
/**
* Represents a reference list.
* @since 0.9.2
*/
public static final class ReferenceList extends AbstractReferenceContainer<List<PropertySymbol>> {
ReferenceList(List<PropertySymbol> entity) {
super(ReferenceKind.LIST, entity);
}
@Override
public List<PropertySymbol> getAllReferences() {
return getEntity().orElse(Collections.emptyList());
}
@Override
public ReferenceList remap(UnaryOperator<PropertySymbol> mapper) {
return new ReferenceList(getEntity()
.map(it -> it.stream()
.map(mapper)
.collect(Collectors.toList()))
.map(Collections::unmodifiableList)
.orElse(null));
}
@Override
public List<PropertySymbol> asList() {
return getEntity().orElseThrow(IllegalStateException::new);
}
}
/**
* Represents a reference association list.
* @since 0.9.2
*/
public static final class ReferenceMap
extends AbstractReferenceContainer<Map<String, PropertySymbol>> {
ReferenceMap(Map<String, PropertySymbol> entity) {
super(ReferenceKind.MAP, entity);
}
@Override
public List<PropertySymbol> getAllReferences() {
return getEntity()
.map(m -> (List<PropertySymbol>) new ArrayList<>(m.values()))
.orElse(Collections.emptyList());
}
@Override
public ReferenceMap remap(UnaryOperator<PropertySymbol> mapper) {
return new ReferenceMap(getEntity()
.map(it -> {
Map<String, PropertySymbol> results = new LinkedHashMap<>();
it.forEach((k, v) -> results.put(k, mapper.apply(v)));
return results;
})
.map(Collections::unmodifiableMap)
.orElse(null));
}
@Override
public Map<String, PropertySymbol> asMap() {
return getEntity().orElseThrow(IllegalStateException::new);
}
}
}