| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.nifi.controller; |
| |
| import org.apache.nifi.connectable.Connection; |
| import org.apache.nifi.connectable.Position; |
| import org.apache.nifi.connectable.Positionable; |
| import org.apache.nifi.groups.ProcessGroup; |
| |
| import java.util.List; |
| import java.util.Map; |
| import java.util.stream.Collectors; |
| |
| /** |
| * Provides utility to scale the positions of {@link Positionable}s and bend points of {@link Connection}s |
| * by a given factor. |
| */ |
| class PositionScaler { |
| |
| /** |
| * Scales the positions of all {@link Position}s in the given {@link ProcessGroup} by |
| * the provided factor. This method replaces all {@link Position}s in each {@link Positionable} |
| * in the {@link ProcessGroup} with a new scaled {@link Position}. |
| * |
| * @param processGroup containing the {@link Positionable}s to be scaled |
| * @param factorX used to scale a {@link Positionable}'s X-coordinate position |
| * @param factorY used to scale a {@link Positionable}'s Y-coordinate position |
| */ |
| public static void scale(ProcessGroup processGroup, double factorX, double factorY) { |
| processGroup.findAllPositionables().stream().forEach(p -> scale(p, factorX, factorY)); |
| Map<Connection, List<Position>> bendPointsByConnection = |
| processGroup.findAllConnections().stream().collect(Collectors.toMap(connection -> connection, Connection::getBendPoints)); |
| bendPointsByConnection.entrySet().stream() |
| .forEach(connectionListEntry -> connectionListEntry.getKey().setBendPoints(connectionListEntry.getValue().stream() |
| .map(p -> scalePosition(p, factorX, factorY)).collect(Collectors.toList()))); |
| |
| } |
| |
| /** |
| * Scales the {@link Position} of the given {@link Positionable} by the provided factor. This method |
| * replaces the {@link Position} in the {@link Positionable} with a new scaled {@link Position}. |
| * |
| * @param positionable containing a {@link Position} to scale |
| * @param factorX used to scale a {@link Positionable}'s X-coordinate position |
| * @param factorY used to scale a {@link Positionable}'s Y-coordinate position |
| */ |
| public static void scale(Positionable positionable, double factorX, double factorY) { |
| final Position startingPosition = positionable.getPosition(); |
| final Position scaledPosition = scalePosition(startingPosition, factorX, factorY); |
| positionable.setPosition(scaledPosition); |
| } |
| |
| private static Position scalePosition(Position position, double factorX, double factorY) { |
| return new Position(position.getX() * factorX, |
| position.getY() * factorY); |
| } |
| |
| } |