1 | /* |
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2 | * ConcatenatedStream.java |
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3 | * |
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4 | * Copyright (C) 2004-2005 Peter Graves |
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5 | * $Id: ConcatenatedStream.java 14466 2013-04-24 12:50:40Z rschlatte $ |
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6 | * |
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7 | * This program is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU General Public License |
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9 | * as published by the Free Software Foundation; either version 2 |
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10 | * of the License, or (at your option) any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with this program; if not, write to the Free Software |
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19 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 | * |
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21 | * As a special exception, the copyright holders of this library give you |
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22 | * permission to link this library with independent modules to produce an |
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23 | * executable, regardless of the license terms of these independent |
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24 | * modules, and to copy and distribute the resulting executable under |
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25 | * terms of your choice, provided that you also meet, for each linked |
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26 | * independent module, the terms and conditions of the license of that |
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27 | * module. An independent module is a module which is not derived from |
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28 | * or based on this library. If you modify this library, you may extend |
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29 | * this exception to your version of the library, but you are not |
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30 | * obligated to do so. If you do not wish to do so, delete this |
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31 | * exception statement from your version. |
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32 | */ |
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33 | |
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34 | package org.armedbear.lisp; |
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35 | |
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36 | import static org.armedbear.lisp.Lisp.*; |
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37 | |
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38 | public final class ConcatenatedStream extends Stream |
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39 | { |
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40 | LispObject streams; |
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41 | |
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42 | ConcatenatedStream(LispObject streams) |
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43 | { |
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44 | super(Symbol.CONCATENATED_STREAM); |
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45 | this.streams = streams; |
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46 | isInputStream = true; |
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47 | } |
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48 | |
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49 | @Override |
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50 | public boolean isCharacterInputStream() |
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51 | { |
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52 | if (streams == NIL) |
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53 | return true; |
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54 | return ((Stream)streams.car()).isCharacterInputStream(); |
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55 | } |
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56 | |
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57 | @Override |
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58 | public boolean isBinaryInputStream() |
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59 | { |
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60 | if (streams == NIL) |
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61 | return true; |
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62 | return ((Stream)streams.car()).isBinaryInputStream(); |
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63 | } |
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64 | |
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65 | @Override |
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66 | public boolean isCharacterOutputStream() |
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67 | { |
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68 | return false; |
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69 | } |
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70 | |
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71 | @Override |
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72 | public boolean isBinaryOutputStream() |
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73 | { |
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74 | return false; |
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75 | } |
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76 | |
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77 | @Override |
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78 | public LispObject typeOf() |
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79 | { |
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80 | return Symbol.CONCATENATED_STREAM; |
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81 | } |
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82 | |
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83 | @Override |
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84 | public LispObject classOf() |
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85 | { |
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86 | return BuiltInClass.CONCATENATED_STREAM; |
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87 | } |
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88 | |
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89 | @Override |
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90 | public LispObject typep(LispObject typeSpecifier) |
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91 | { |
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92 | if (typeSpecifier == Symbol.CONCATENATED_STREAM) |
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93 | return T; |
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94 | if (typeSpecifier == BuiltInClass.CONCATENATED_STREAM) |
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95 | return T; |
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96 | return super.typep(typeSpecifier); |
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97 | } |
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98 | |
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99 | @Override |
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100 | public LispObject getElementType() |
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101 | { |
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102 | if (streams == NIL) |
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103 | return NIL; |
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104 | return ((Stream)streams.car()).getElementType(); |
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105 | } |
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106 | |
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107 | @Override |
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108 | public LispObject readCharNoHang(boolean eofError, LispObject eofValue) |
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109 | |
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110 | { |
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111 | if (streams == NIL) { |
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112 | if (eofError) |
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113 | return error(new EndOfFile(this)); |
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114 | else |
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115 | return eofValue; |
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116 | } |
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117 | try |
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118 | { |
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119 | return _charReady() ? readChar(eofError, eofValue) : NIL; |
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120 | } |
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121 | catch (java.io.IOException e) |
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122 | { |
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123 | return error(new StreamError(this, e)); |
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124 | } |
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125 | } |
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126 | |
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127 | @Override |
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128 | public LispObject listen() |
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129 | { |
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130 | if (streams == NIL) |
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131 | return NIL; |
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132 | Stream stream = (Stream)streams.car(); |
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133 | return stream.listen(); |
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134 | } |
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135 | |
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136 | // Returns -1 at end of file. |
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137 | @Override |
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138 | protected int _readChar() throws java.io.IOException |
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139 | { |
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140 | int n; |
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141 | if (streams == NIL) |
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142 | return -1; |
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143 | Stream stream = (Stream) streams.car(); |
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144 | n = stream._readChar(); |
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145 | if (n >= 0) |
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146 | return n; |
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147 | streams = streams.cdr(); |
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148 | return _readChar(); |
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149 | } |
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150 | |
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151 | @Override |
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152 | protected void _unreadChar(int n) throws java.io.IOException |
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153 | { |
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154 | if (streams == NIL) |
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155 | error(new StreamError(this, "UNREAD-CHAR was invoked without a stream to unread into.")); |
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156 | Stream stream = (Stream)streams.car(); |
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157 | |
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158 | stream._unreadChar(n); |
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159 | } |
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160 | |
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161 | @Override |
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162 | protected boolean _charReady() throws java.io.IOException |
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163 | { |
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164 | if (streams == NIL) |
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165 | return false; |
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166 | Stream stream = (Stream) streams.car(); |
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167 | if (stream._charReady()) |
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168 | return true; |
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169 | LispObject remainingStreams = streams.cdr(); |
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170 | while (remainingStreams != NIL) { |
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171 | stream = (Stream) remainingStreams.car(); |
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172 | if (stream._charReady()) |
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173 | return true; |
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174 | remainingStreams = remainingStreams.cdr(); |
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175 | } |
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176 | return false; |
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177 | } |
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178 | |
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179 | @Override |
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180 | public void _writeChar(char c) |
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181 | { |
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182 | outputStreamError(); |
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183 | } |
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184 | |
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185 | @Override |
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186 | public void _writeChars(char[] chars, int start, int end) |
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187 | |
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188 | { |
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189 | outputStreamError(); |
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190 | } |
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191 | |
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192 | @Override |
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193 | public void _writeString(String s) |
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194 | { |
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195 | outputStreamError(); |
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196 | } |
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197 | |
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198 | @Override |
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199 | public void _writeLine(String s) |
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200 | { |
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201 | outputStreamError(); |
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202 | } |
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203 | |
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204 | // Reads an 8-bit byte. |
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205 | @Override |
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206 | public int _readByte() |
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207 | { |
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208 | if (streams == NIL) |
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209 | return -1; |
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210 | Stream stream = (Stream) streams.car(); |
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211 | int n = stream._readByte(); |
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212 | if (n >= 0) |
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213 | return n; |
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214 | streams = streams.cdr(); |
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215 | return _readByte(); |
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216 | } |
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217 | |
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218 | // Writes an 8-bit byte. |
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219 | @Override |
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220 | public void _writeByte(int n) |
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221 | { |
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222 | outputStreamError(); |
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223 | } |
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224 | |
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225 | @Override |
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226 | public void _finishOutput() |
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227 | { |
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228 | outputStreamError(); |
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229 | } |
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230 | |
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231 | @Override |
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232 | public void _clearInput() |
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233 | { |
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234 | // FIXME |
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235 | } |
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236 | |
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237 | private void outputStreamError() |
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238 | { |
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239 | error(new StreamError(this, |
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240 | String.valueOf(this) + " is not an output stream.")); |
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241 | } |
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242 | |
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243 | // ### make-concatenated-stream &rest streams => concatenated-stream |
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244 | private static final Primitive MAKE_CONCATENATED_STREAM = |
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245 | new Primitive("make-concatenated-stream", "&rest streams") |
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246 | { |
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247 | @Override |
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248 | public LispObject execute(LispObject[] args) |
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249 | { |
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250 | LispObject streams = NIL; |
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251 | for (int i = 0; i < args.length; i++) { |
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252 | if (args[i] instanceof Stream) { |
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253 | Stream stream = (Stream) args[i]; |
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254 | if (stream.isInputStream()) { |
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255 | // streams[i] = (Stream) args[i]; |
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256 | streams = new Cons(stream, streams); |
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257 | continue; |
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258 | } |
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259 | } |
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260 | error(new TypeError(String.valueOf(args[i]) + |
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261 | " is not an input stream.")); |
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262 | } |
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263 | return new ConcatenatedStream(streams.nreverse()); |
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264 | } |
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265 | }; |
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266 | |
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267 | // ### concatenated-stream-streams concatenated-stream => streams |
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268 | private static final Primitive CONCATENATED_STREAM_STREAMS = |
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269 | new Primitive("concatenated-stream-streams", "concatenated-stream") |
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270 | { |
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271 | @Override |
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272 | public LispObject execute(LispObject arg) |
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273 | { |
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274 | if (arg instanceof ConcatenatedStream) |
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275 | return ((ConcatenatedStream)arg).streams; |
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276 | return type_error(arg, Symbol.CONCATENATED_STREAM); |
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277 | } |
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278 | }; |
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279 | } |
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