| /* |
| * Copyright 2009 Google Inc. |
| * |
| * 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.gwt.dev.jjs.impl.gflow; |
| |
| /** |
| * Assumptions are members of the lattice used in the analysis. Assumptions |
| * are associated with graph edges and depict analysis knowledge about the flow. |
| * |
| * So far we need only join operation to perform analysis. |
| * |
| * Lattice's bottom should be represented by <code>null</null>. |
| * |
| * Assumption should implement correct equals() and hashCode() methods. |
| * |
| * @param <Self> self type. |
| */ |
| public interface Assumption<Self extends Assumption<?>> { |
| /** |
| * Compute least upper bound. Should accept <code>null</null>. |
| * It's allowed to return value, equal either to <code>this</code> or to |
| * <code>other</code>. If you're going to modify result of join operation, |
| * you have to copy it. |
| */ |
| Self join(Self other); |
| } |