shell/ssh/src/main/java/org/apache/karaf/shell/ssh/SshTerminal.java

/*
 * 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.karaf.shell.ssh;

import org.apache.karaf.shell.api.console.Signal;
import org.apache.karaf.shell.api.console.Terminal;
import org.apache.karaf.shell.support.terminal.SignalSupport;
import org.apache.sshd.common.PtyMode;
import org.apache.sshd.server.Environment;

public class SshTerminal extends SignalSupport implements Terminal {

    private Environment environment;
    private boolean echo;

    public SshTerminal(Environment environment) {
        this.environment = environment;
        this.environment.addSignalListener(new org.apache.sshd.server.SignalListener() {
            @Override
            public void signal(org.apache.sshd.server.Signal signal) {
                SshTerminal.this.signal(Signal.WINCH);
            }
        }, org.apache.sshd.server.Signal.WINCH);
        this.echo = environment.getPtyModes().containsKey(PtyMode.ECHO);
    }

    @Override
    public String getType() {
        return environment.getEnv().get(Environment.ENV_TERM);
    }

    @Override
    public int getWidth() {
        int width = 0;
        try {
            width = Integer.valueOf(this.environment.getEnv().get(Environment.ENV_COLUMNS));
        } catch (Throwable t) {
            // Ignore
        }
        return width > 0 ? width : 80;
    }

    @Override
    public int getHeight() {
        int height = 0;
        try {
            height = Integer.valueOf(this.environment.getEnv().get(Environment.ENV_LINES));
        } catch (Throwable t) {
            // Ignore
        }
        return height > 0 ? height : 24;
    }

    @Override
    public boolean isAnsiSupported() {
        return true;
    }

    @Override
    public boolean isEchoEnabled() {
        return echo;
    }

    @Override
    public void setEchoEnabled(boolean enabled) {
        echo = enabled;
    }

    public Environment getEnvironment() {
        return environment;
    }

}