opendaylight/netconf/netconf-cli/src/main/java/org/opendaylight/controller/netconf/cli/reader/impl/DecisionReader.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.netconf.cli.reader.impl;
   9
  10 import static org.opendaylight.controller.netconf.cli.io.IOUtil.SKIP;
  11
  12 import com.google.common.base.Optional;
  13 import java.io.IOException;
  14 import jline.console.completer.AggregateCompleter;
  15 import jline.console.completer.Completer;
  16 import jline.console.completer.StringsCompleter;
  17 import jline.internal.Log;
  18 import org.opendaylight.controller.netconf.cli.io.ConsoleContext;
  19 import org.opendaylight.controller.netconf.cli.io.ConsoleIO;
  20 import org.opendaylight.controller.netconf.cli.io.IOUtil;
  21 import org.opendaylight.controller.netconf.cli.reader.ReadingException;
  22
  23 public class DecisionReader {
  24
  25     private static final String YES = "Y";
  26     private static final String NO = "N";
  27     public static final Completer YES_NO_COMPLETER = new StringsCompleter(YES, NO);
  28
  29     public Optional<Boolean> read(final ConsoleIO console, final String questionMessageBlueprint,
  30             final Object... questionMessageArgs) throws IOException, ReadingException {
  31         final ConsoleContext ctx = getContext();
  32         console.enterContext(ctx);
  33         try {
  34             console.formatLn(questionMessageBlueprint, questionMessageArgs);
  35             final String rawValue = console.read();
  36             if (YES.equals(rawValue.toUpperCase())) {
  37                 return Optional.of(Boolean.TRUE);
  38             } else if (NO.equals(rawValue.toUpperCase())) {
  39                 return Optional.of(Boolean.FALSE);
  40             } else if (SKIP.equals(rawValue)) {
  41                 return Optional.absent();
  42             } else {
  43                 final String message = String.format("Incorrect possibility (%s) was selected", rawValue);
  44                 Log.error(message);
  45                 throw new ReadingException(message);
  46             }
  47         } finally {
  48             console.leaveContext();
  49         }
  50     }
  51
  52     private static ConsoleContext getContext() {
  53         return new ConsoleContext() {
  54
  55             @Override
  56             public Optional<String> getPrompt() {
  57                 return Optional.absent();
  58             }
  59
  60             @Override
  61             public Completer getCompleter() {
  62                 return new AggregateCompleter(YES_NO_COMPLETER, new StringsCompleter(IOUtil.SKIP));
  63             }
  64
  65         };
  66     }
  67
  68 }