/*
* 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.console.completer;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.felix.gogo.commands.basic.AbstractCommand;
import org.apache.felix.gogo.runtime.shell.CommandProxy;
import org.apache.felix.gogo.runtime.shell.CommandSessionImpl;
import org.apache.karaf.shell.console.CompletableFunction;
import org.apache.karaf.shell.console.Completer;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.service.command.CommandSession;
import org.osgi.service.command.Function;
/**
* Like the {@link org.apache.karaf.shell.console.completer.CommandsCompleter} but does not use OSGi but is
* instead used from the non-OSGi {@link org.apache.karaf.shell.console.Main}
*/
public class CommandsCompleter implements Completer {
private CommandSession session;
private final List<Completer> completers = new ArrayList<Completer>();
private final Set<String> commands = new HashSet<String>();
public CommandsCompleter(CommandSession session) {
this.session = session;
}
public int complete(String buffer, int cursor, List<String> candidates) {
checkData();
int res = new AggregateCompleter(completers).complete(buffer, cursor, candidates);
Collections.sort(candidates);
return res;
}
protected synchronized void checkData() {
Set<String> names = (Set<String>) session.get(CommandSessionImpl.COMMANDS);
if (!names.equals(commands)) {
commands.clear();
completers.clear();
for (String command : names) {
Function function = (Function) session.get(command);
function = unProxy(function);
if (function instanceof AbstractCommand) {
completers.add(new ArgumentCompleter(session, (AbstractCommand) function, command));
}
commands.add(command);
}
}
}
protected Function unProxy(Function function) {
try {
if (function instanceof CommandProxy) {
Field contextField = function.getClass().getDeclaredField("context");
Field referenceField = function.getClass().getDeclaredField("reference");
contextField.setAccessible(true);
referenceField.setAccessible(true);
BundleContext context = (BundleContext) contextField.get(function);
ServiceReference reference = (ServiceReference) referenceField.get(function);
Object target = context.getService(reference);
try {
if (target instanceof Function) {
function = (Function) target;
}
} finally {
context.ungetService(reference);
}
}
} catch (Throwable t) {
}
return function;
}
}