| /* |
| * 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.cocoon.components.flow.apples.samples; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Stack; |
| |
| import org.apache.avalon.framework.logger.AbstractLogEnabled; |
| import org.apache.cocoon.ProcessingException; |
| import org.apache.cocoon.components.flow.apples.AppleController; |
| import org.apache.cocoon.components.flow.apples.AppleRequest; |
| import org.apache.cocoon.components.flow.apples.AppleResponse; |
| |
| /** |
| * HanoiApple shows an apple maintaining the state of the fanous puzzle. |
| */ |
| public class HanoiApple extends AbstractLogEnabled implements AppleController { |
| |
| public static final int NONE = -1; |
| public static final int SRC = 0; |
| public static final int AUX = 1; |
| public static final int DST = 2; |
| |
| // full state of the puzzle is in the following variables |
| public Stack[] stacks; |
| public Object floatingDisk = null; |
| public int moves = 0; |
| public int puzzleSize = 0; |
| |
| |
| public String toString() { |
| return "HanoiApple[ stacks=" + this.stacks + " | floatingDisk=" + this.floatingDisk |
| + " | moves = " + this.moves + "]"; |
| } |
| |
| |
| public void process(AppleRequest req, AppleResponse res) throws ProcessingException { |
| |
| // processing |
| if (stacks == null) { |
| String requestSize = req.getCocoonRequest().getParameter("size"); |
| if (requestSize != null) { |
| try { |
| int size = Integer.parseInt(requestSize); |
| intializeStacks(size); |
| } catch (NumberFormatException ignore) { |
| } |
| } |
| } else { |
| // decide selected column |
| String requestStack = req.getCocoonRequest().getParameter("stack"); |
| if (requestStack != null) { |
| try { |
| int stackNdx = Integer.parseInt(requestStack); |
| if (this.floatingDisk != null) { |
| // we are in the middle of a move --> complete move if it is allowed |
| if ( this.stacks[stackNdx].size() == 0 |
| || ((Integer)this.floatingDisk).intValue() < ((Integer)this.stacks[stackNdx].peek()).intValue()) { |
| |
| this.stacks[stackNdx].push(this.floatingDisk); |
| this.floatingDisk = null; |
| this.moves++; |
| } |
| } else { |
| if (this.stacks[stackNdx].size() != 0) { |
| this.floatingDisk = this.stacks[stackNdx].pop(); |
| } |
| } |
| } catch (RuntimeException ignore) { |
| //NUMBERFORMAT |
| //ARRAYINDEXOUTOFBOUNDS |
| } |
| } |
| } |
| |
| getLogger().debug(toString()); |
| |
| //view generation |
| if (stacks == null) { |
| res.sendPage("hanoi/intro.jx", null); |
| } else { |
| Map bizdata = new HashMap(); |
| bizdata.put("stacks" , this.stacks); |
| bizdata.put("moves" , "" + this.moves); |
| bizdata.put("floatingDisk", this.floatingDisk); |
| bizdata.put("nextMove" , this.floatingDisk==null ? "Lift it!" : "Drop it!"); |
| bizdata.put("puzzleSize" , "" + this.puzzleSize); |
| |
| res.sendPage("hanoi/hanoi.jx", bizdata); |
| } |
| |
| } |
| |
| |
| private void intializeStacks(int size) { |
| if (size > 2) { |
| this.stacks = new Stack[3]; |
| for (int i = 0; i < 3; i++) { |
| this.stacks[i] = new Stack(); |
| } |
| for (int i = size; i > 0; i--) { |
| this.stacks[0].push(new Integer(i)); |
| } |
| this.puzzleSize = size; |
| } |
| } |
| |
| } |