| /* |
| * 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.sshd.server; |
| |
| import java.util.Collection; |
| import java.util.Map; |
| |
| import org.apache.sshd.common.channel.PtyMode; |
| import org.apache.sshd.common.util.GenericUtils; |
| |
| /** |
| * Interface providing access to the environment map and allowing the registration of listeners for certain signals. |
| * |
| * @see org.apache.sshd.server.Signal |
| */ |
| public interface Environment { |
| /** |
| * Key for the user environment variable |
| */ |
| String ENV_USER = "USER"; |
| |
| /** |
| * Key for the lines environment variable. Specifies the number of lines visible on the client side. |
| * {@link #ENV_LINES} and {@link #ENV_COLUMNS} make up the console screen size. |
| */ |
| String ENV_LINES = "LINES"; |
| |
| /** |
| * Key for the columns environment variable. Specifies the number of columns visible on the client side. |
| * {@link #ENV_LINES} and {@link #ENV_COLUMNS} make up the console screen size. |
| */ |
| String ENV_COLUMNS = "COLUMNS"; |
| |
| /** |
| * Key for the term environment variable. Describes the terminal or terminal emulation which is in use. |
| */ |
| String ENV_TERM = "TERM"; |
| |
| /** |
| * Retrieve the environment map |
| * |
| * @return the environment {@link Map} - never {@code null} |
| */ |
| Map<String, String> getEnv(); |
| |
| /** |
| * Retrieve the PTY modes settings |
| * |
| * @return the {@link Map} of {@link PtyMode}s - never {@code null} |
| */ |
| Map<PtyMode, Integer> getPtyModes(); |
| |
| /** |
| * Add a qualified listener for the specific signals |
| * |
| * @param listener the {@link SignalListener} to register |
| * @param signals The (never {@code null}/empty) {@link Signal}s the listener is interested in |
| */ |
| default void addSignalListener(SignalListener listener, Signal... signals) { |
| addSignalListener(listener, GenericUtils.of(signals)); |
| } |
| |
| /** |
| * Add a global listener for all signals |
| * |
| * @param listener the {@link SignalListener} to register |
| */ |
| default void addSignalListener(SignalListener listener) { |
| addSignalListener(listener, Signal.SIGNALS); |
| } |
| |
| /** |
| * Add a qualified listener for the specific signals |
| * |
| * @param listener the {@link SignalListener} to register |
| * @param signals the {@link Signal}s the listener is interested in |
| */ |
| void addSignalListener(SignalListener listener, Collection<Signal> signals); |
| |
| /** |
| * Remove a previously registered listener for all the signals it was registered |
| * |
| * @param listener the {@link SignalListener} to remove |
| */ |
| void removeSignalListener(SignalListener listener); |
| } |