/*
* Copyright (c) 2013, 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.member;
import com.google.dart.engine.ast.MethodDeclaration;
import com.google.dart.engine.context.AnalysisException;
import com.google.dart.engine.element.ClassElement;
import com.google.dart.engine.element.Element;
import com.google.dart.engine.element.ElementVisitor;
import com.google.dart.engine.element.MethodElement;
import com.google.dart.engine.element.ParameterElement;
import com.google.dart.engine.type.FunctionType;
import com.google.dart.engine.type.InterfaceType;
import com.google.dart.engine.type.Type;
/**
* Instances of the class {@code MethodMember} represent a method element defined in a parameterized
* type where the values of the type parameters are known.
*/
public class MethodMember extends ExecutableMember implements MethodElement {
/**
* If the given method's type is different when any type parameters from the defining type's
* declaration are replaced with the actual type arguments from the defining type, create a method
* member representing the given method. Return the member that was created, or the base method if
* no member was created.
*
* @param baseMethod the base method for which a member might be created
* @param definingType the type defining the parameters and arguments to be used in the
* substitution
* @return the method element that will return the correctly substituted types
*/
public static MethodElement from(MethodElement baseMethod, InterfaceType definingType) {
if (baseMethod == null || definingType.getTypeArguments().length == 0) {
return baseMethod;
}
FunctionType baseType = baseMethod.getType();
Type[] argumentTypes = definingType.getTypeArguments();
Type[] parameterTypes = definingType.getElement().getType().getTypeArguments();
FunctionType substitutedType = baseType.substitute(argumentTypes, parameterTypes);
if (baseType.equals(substitutedType)) {
return baseMethod;
}
// TODO(brianwilkerson) Consider caching the substituted type in the instance. It would use more
// memory but speed up some operations. We need to see how often the type is being re-computed.
return new MethodMember(baseMethod, definingType);
}
/**
* Initialize a newly created element to represent a method of the given parameterized type.
*
* @param baseElement the element on which the parameterized element was created
* @param definingType the type in which the element is defined
*/
public MethodMember(MethodElement baseElement, InterfaceType definingType) {
super(baseElement, definingType);
}
@Override
public <R> R accept(ElementVisitor<R> visitor) {
return visitor.visitMethodElement(this);
}
@Override
public MethodElement getBaseElement() {
return (MethodElement) super.getBaseElement();
}
@Override
public ClassElement getEnclosingElement() {
return getBaseElement().getEnclosingElement();
}
@Override
public MethodDeclaration getNode() throws AnalysisException {
return getBaseElement().getNode();
}
@Override
public boolean isAbstract() {
return getBaseElement().isAbstract();
}
@Override
public String toString() {
MethodElement baseElement = getBaseElement();
ParameterElement[] parameters = getParameters();
FunctionType type = getType();
StringBuilder builder = new StringBuilder();
builder.append(baseElement.getEnclosingElement().getDisplayName());
builder.append(".");
builder.append(baseElement.getDisplayName());
builder.append("(");
int parameterCount = parameters.length;
for (int i = 0; i < parameterCount; i++) {
if (i > 0) {
builder.append(", ");
}
builder.append(parameters[i]).toString();
}
builder.append(")");
if (type != null) {
builder.append(Element.RIGHT_ARROW);
builder.append(type.getReturnType());
}
return builder.toString();
}
}