| /* |
| * 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.pig.tools.grunt; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.SequenceInputStream; |
| import java.util.Enumeration; |
| import jline.console.ConsoleReader; |
| import jline.console.history.FileHistory; |
| |
| /** Borrowed from jline.console.internal.ConsoleReaderInputStream. However, |
| * we cannot use ConsoleReaderInputStream directly since: |
| * 1. ConsoleReaderInputStream is not public |
| * 2. ConsoleReaderInputStream has a bug which does not deal with UTF-8 correctly |
| */ |
| public class ConsoleReaderInputStream extends SequenceInputStream { |
| private static InputStream systemIn = System.in; |
| |
| public static void setIn() throws IOException { |
| setIn(new ConsoleReader()); |
| } |
| |
| public static void setIn(final ConsoleReader reader) { |
| System.setIn(new ConsoleReaderInputStream(reader)); |
| } |
| |
| /** |
| * Restore the original {@link System#in} input stream. |
| */ |
| public static void restoreIn() { |
| System.setIn(systemIn); |
| } |
| |
| public ConsoleReaderInputStream(final ConsoleReader reader) { |
| super(new ConsoleEnumeration(reader)); |
| } |
| |
| private static class ConsoleEnumeration implements Enumeration { |
| private final ConsoleReader reader; |
| private ConsoleLineInputStream next = null; |
| private ConsoleLineInputStream prev = null; |
| |
| public ConsoleEnumeration(final ConsoleReader reader) { |
| this.reader = reader; |
| } |
| |
| public Object nextElement() { |
| if (next != null) { |
| InputStream n = next; |
| prev = next; |
| next = null; |
| |
| return n; |
| } |
| |
| return new ConsoleLineInputStream(reader); |
| } |
| |
| public boolean hasMoreElements() { |
| // the last line was null |
| if ((prev != null) && (prev.wasNull == true)) { |
| return false; |
| } |
| |
| if (next == null) { |
| next = (ConsoleLineInputStream) nextElement(); |
| } |
| |
| return next != null; |
| } |
| } |
| |
| private static class ConsoleLineInputStream extends InputStream { |
| private final ConsoleReader reader; |
| private byte[] buffer = null; |
| private int index = 0; |
| private boolean eol = false; |
| protected boolean wasNull = false; |
| |
| public ConsoleLineInputStream(final ConsoleReader reader) { |
| this.reader = reader; |
| } |
| |
| public int read() throws IOException { |
| if (eol) { |
| return -1; |
| } |
| |
| if (buffer == null) { |
| //buffer = reader.readLine().getBytes(); |
| String buff = reader.readLine(); |
| if (buff == null){ |
| buff = "quit";} |
| buffer = buff.getBytes(); |
| |
| //Write current grunt buffer to pig history file |
| ((FileHistory)reader.getHistory()).flush(); |
| } |
| |
| if (buffer == null) { |
| wasNull = true; |
| return -1; |
| } |
| |
| if (index >= buffer.length) { |
| eol = true; |
| return '\n'; // lines are ended with a newline |
| } |
| |
| return buffer[index++]; |
| } |
| } |
| } |