/*

* Copyright 2018 by Daan van den Heuvel.

*

* This file is part of JavaDataFlow.

*

* 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 model;

/**

* An edge inside a {@link DataFlowGraph} representing a {@link DataFlowNode} influencing the state of another {@link DataFlowNode}.

*

* @author Daan

*/

public class DataFlowEdge {

private DataFlowNode from;

private DataFlowNode to;

public DataFlowEdge() {

// empty constructor which would otherwise be invisible due to the constructor receiving the builder.

}

private DataFlowEdge(Builder builder) {

this.from = builder.from == null ? this.from : builder.from;

this.to = builder.to == null ? this.to : builder.to;

}

public DataFlowEdge(DataFlowNode from, DataFlowNode to) {

this.from = from;

this.to = to;

}

public DataFlowNode getFrom() {

return from;

}

public void setFrom(DataFlowNode from) {

this.from = from;

}

public DataFlowNode getTo() {

return to;

}

public void setTo(DataFlowNode to) {

this.to = to;

}

@Override

public String toString() {

return from.getName() + "->" + to.getName();

}

/**

* Creates builder to build {@link DataFlowEdge}.

*

* @return created builder

*/

public static Builder builder() {

return new Builder();

}

/**

* Builder to build {@link DataFlowEdge}.

*/

public static final class Builder {

private DataFlowNode from;

private DataFlowNode to;

private Builder() {

// Builder should only be constructed via the parent class

}

public Builder from(DataFlowNode from) {

this.from = from;

return this;

}

public Builder to(DataFlowNode to) {

this.to = to;

return this;

}

public DataFlowEdge build() {

return new DataFlowEdge(this);

}

}

}