/*
* Copyright (c) 2012, the Dart project authors.
*
* Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
*
* 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.dart.engine.internal.element;
import com.google.dart.engine.ast.FunctionTypeAlias;
import com.google.dart.engine.ast.Identifier;
import com.google.dart.engine.context.AnalysisException;
import com.google.dart.engine.element.CompilationUnitElement;
import com.google.dart.engine.element.Element;
import com.google.dart.engine.element.ElementKind;
import com.google.dart.engine.element.ElementVisitor;
import com.google.dart.engine.element.FunctionTypeAliasElement;
import com.google.dart.engine.element.ParameterElement;
import com.google.dart.engine.element.TypeParameterElement;
import com.google.dart.engine.element.VariableElement;
import com.google.dart.engine.internal.resolver.TypeResolverVisitor;
import com.google.dart.engine.type.FunctionType;
import com.google.dart.engine.type.Type;
/**
* Instances of the class {@code FunctionTypeAliasElementImpl} implement a
* {@code FunctionTypeAliasElement}.
*
* @coverage dart.engine.element
*/
public class FunctionTypeAliasElementImpl extends ElementImpl implements FunctionTypeAliasElement {
/**
* An array containing all of the parameters defined by this type alias.
*/
private ParameterElement[] parameters = ParameterElementImpl.EMPTY_ARRAY;
/**
* The return type defined by this type alias.
*/
private Type returnType;
/**
* The type of function defined by this type alias.
*/
private FunctionType type;
/**
* An array containing all of the type parameters defined for this type.
*/
private TypeParameterElement[] typeParameters = TypeParameterElementImpl.EMPTY_ARRAY;
/**
* An empty array of type alias elements.
*/
public static final FunctionTypeAliasElement[] EMPTY_ARRAY = new FunctionTypeAliasElement[0];
/**
* Initialize a newly created type alias element to have the given name.
*
* @param name the name of this element
*/
public FunctionTypeAliasElementImpl(Identifier name) {
super(name);
}
@Override
public <R> R accept(ElementVisitor<R> visitor) {
return visitor.visitFunctionTypeAliasElement(this);
}
@Override
public ElementImpl getChild(String identifier) {
for (VariableElement parameter : parameters) {
if (((VariableElementImpl) parameter).getIdentifier().equals(identifier)) {
return (VariableElementImpl) parameter;
}
}
for (TypeParameterElement typeParameter : typeParameters) {
if (((TypeParameterElementImpl) typeParameter).getIdentifier().equals(identifier)) {
return (TypeParameterElementImpl) typeParameter;
}
}
return null;
}
@Override
public CompilationUnitElement getEnclosingElement() {
return (CompilationUnitElement) super.getEnclosingElement();
}
@Override
public ElementKind getKind() {
return ElementKind.FUNCTION_TYPE_ALIAS;
}
@Override
public FunctionTypeAlias getNode() throws AnalysisException {
return getNodeMatching(FunctionTypeAlias.class);
}
@Override
public ParameterElement[] getParameters() {
return parameters;
}
@Override
public Type getReturnType() {
return returnType;
}
@Override
public FunctionType getType() {
return type;
}
@Override
public TypeParameterElement[] getTypeParameters() {
return typeParameters;
}
/**
* Set the parameters defined by this type alias to the given parameters.
*
* @param parameters the parameters defined by this type alias
*/
public void setParameters(ParameterElement[] parameters) {
if (parameters != null) {
for (ParameterElement parameter : parameters) {
((ParameterElementImpl) parameter).setEnclosingElement(this);
}
}
this.parameters = parameters;
}
/**
* Set the return type defined by this type alias.
*
* @param returnType the return type defined by this type alias
*/
public void setReturnType(Type returnType) {
this.returnType = returnType;
}
/**
* Set the type of function defined by this type alias to the given type.
*
* @param type the type of function defined by this type alias
*/
public void setType(FunctionType type) {
this.type = type;
}
/**
* Set the type parameters defined for this type to the given parameters.
*
* @param typeParameters the type parameters defined for this type
*/
public void setTypeParameters(TypeParameterElement[] typeParameters) {
for (TypeParameterElement typeParameter : typeParameters) {
((TypeParameterElementImpl) typeParameter).setEnclosingElement(this);
}
this.typeParameters = typeParameters;
}
/**
* Set the parameters defined by this type alias to the given parameters without becoming the
* parent of the parameters. This should only be used by the {@link TypeResolverVisitor} when
* creating a synthetic type alias.
*
* @param parameters the parameters defined by this type alias
*/
public void shareParameters(ParameterElement[] parameters) {
this.parameters = parameters;
}
/**
* Set the type parameters defined for this type to the given parameters without becoming the
* parent of the parameters. This should only be used by the {@link TypeResolverVisitor} when
* creating a synthetic type alias.
*
* @param typeParameters the type parameters defined for this type
*/
public void shareTypeParameters(TypeParameterElement[] typeParameters) {
this.typeParameters = typeParameters;
}
@Override
public void visitChildren(ElementVisitor<?> visitor) {
super.visitChildren(visitor);
safelyVisitChildren(parameters, visitor);
safelyVisitChildren(typeParameters, visitor);
}
@Override
protected void appendTo(StringBuilder builder) {
builder.append("typedef ");
builder.append(getDisplayName());
int typeParameterCount = typeParameters.length;
if (typeParameterCount > 0) {
builder.append("<");
for (int i = 0; i < typeParameterCount; i++) {
if (i > 0) {
builder.append(", ");
}
((TypeParameterElementImpl) typeParameters[i]).appendTo(builder);
}
builder.append(">");
}
builder.append("(");
int parameterCount = parameters.length;
for (int i = 0; i < parameterCount; i++) {
if (i > 0) {
builder.append(", ");
}
((ParameterElementImpl) parameters[i]).appendTo(builder);
}
builder.append(")");
if (type != null) {
builder.append(Element.RIGHT_ARROW);
builder.append(type.getReturnType());
}
}
}