/*
* 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.google.devtools.cyclefinder;
import com.google.common.base.Objects;
/**
* Represents a possible reference from one type to another.
*/
class Edge {
private final TypeNode origin;
private final TypeNode target;
private final String fieldQualifiedName;
private final String description;
private Edge(TypeNode origin, TypeNode target, String fieldQualifiedName, String description) {
this.origin = origin;
this.target = target;
this.fieldQualifiedName = fieldQualifiedName;
this.description = description;
}
public static Edge newFieldEdge(TypeNode origin, TypeNode target, String fieldName) {
return new Edge(origin, target, origin.getQualifiedName() + '.' + fieldName,
"(field " + fieldName + " with type " + target.getName() + ")");
}
public static Edge newSubtypeEdge(Edge original, TypeNode target) {
return new Edge(original.origin, target, original.fieldQualifiedName,
"(" + target.getName() + " subtype of " + original.description + ")");
}
public static Edge newSuperclassEdge(Edge original, TypeNode origin, TypeNode superclass) {
return new Edge(origin, original.target, original.fieldQualifiedName,
"(superclass " + superclass.getName() + " has " + original.description + ")");
}
public static Edge newOuterClassEdge(TypeNode origin, TypeNode target) {
return new Edge(origin, target, null, "(outer class " + target.getName() + ")");
}
public static Edge newReceiverClassEdge(TypeNode origin, TypeNode target) {
return new Edge(origin, target, null, "(receiver class " + target.getName() + ")");
}
public static Edge newCaptureEdge(TypeNode origin, TypeNode target, String varName) {
return new Edge(origin, target, null,
"(capture " + varName + " with type " + target.getName() + ")");
}
public TypeNode getOrigin() {
return origin;
}
public TypeNode getTarget() {
return target;
}
public String getFieldQualifiedName() {
return fieldQualifiedName;
}
@Override
public String toString() {
return origin.getName() + " -> " + description;
}
@Override
public boolean equals(Object o) {
if (!(o instanceof Edge)) {
return false;
}
Edge e = (Edge) o;
return e.origin.equals(origin) && e.target.equals(target);
}
@Override
public int hashCode() {
return Objects.hashCode(origin, target);
}
}