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1 /* |
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2 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package com.sun.xml.internal.ws.util; |
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27 |
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28 import com.sun.istack.internal.NotNull; |
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29 import com.sun.istack.internal.Nullable; |
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30 |
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31 import java.io.File; |
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32 import java.io.FileInputStream; |
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33 import java.io.FileOutputStream; |
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34 import java.io.IOException; |
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35 import java.io.InputStream; |
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36 |
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37 /** |
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38 * Reads a input stream completely and creates a new stream |
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39 * by keeping some data in memory and the rest on the file system. |
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40 * |
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41 * @author Jitendra Kotamraju |
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42 */ |
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43 public class ReadAllStream extends InputStream { |
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44 |
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45 private final @NotNull MemoryStream memStream; |
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46 private final @NotNull FileStream fileStream; |
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47 |
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48 private boolean readAll; |
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49 private boolean closed; |
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50 |
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51 public ReadAllStream() { |
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52 memStream = new MemoryStream(); |
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53 fileStream = new FileStream(); |
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54 } |
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55 |
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56 /** |
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57 * Reads the data from input stream completely. It keeps |
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58 * inMemory size in the memory, and the rest on the file |
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59 * system. |
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60 * |
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61 * Caller's responsibility to close the InputStream. This |
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62 * method can be called only once. |
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63 * |
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64 * @param in from which to be read |
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65 * @param inMemory this much data is kept in the memory |
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66 * @throws IOException in case of exception |
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67 */ |
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68 public void readAll(InputStream in, long inMemory) throws IOException { |
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69 assert !readAll; |
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70 readAll = true; |
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71 |
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72 boolean eof = memStream.readAll(in, inMemory); |
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73 if (!eof) { |
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74 fileStream.readAll(in); |
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75 } |
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76 } |
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77 |
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78 public int read() throws IOException { |
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79 int ch = memStream.read(); |
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80 if (ch == -1) { |
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81 ch = fileStream.read(); |
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82 } |
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83 return ch; |
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84 } |
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85 |
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86 @Override |
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87 public int read(byte b[], int off, int sz) throws IOException { |
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88 int len = memStream.read(b, off, sz); |
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89 if (len == -1) { |
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90 len = fileStream.read(b, off, sz); |
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91 } |
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92 return len; |
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93 } |
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94 |
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95 public void close() throws IOException { |
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96 if (!closed) { |
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97 memStream.close(); |
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98 fileStream.close(); |
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99 closed = true; |
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100 } |
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101 } |
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102 |
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103 // Keeps the rest of the data on the file system |
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104 private static class FileStream extends InputStream { |
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105 private @Nullable File tempFile; |
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106 private @Nullable FileInputStream fin; |
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107 |
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108 void readAll(InputStream in) throws IOException { |
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109 tempFile = File.createTempFile("jaxws",".bin"); |
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110 FileOutputStream fileOut = new FileOutputStream(tempFile); |
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111 try { |
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112 byte[] buf = new byte[8192]; |
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113 int len; |
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114 while((len=in.read(buf)) != -1) { |
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115 fileOut.write(buf, 0, len); |
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116 } |
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117 } finally { |
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118 fileOut.close(); |
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119 } |
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120 fin = new FileInputStream(tempFile); |
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121 } |
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122 |
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123 public int read() throws IOException { |
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124 return (fin != null) ? fin.read() : -1; |
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125 } |
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126 |
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127 @Override |
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128 public int read(byte b[], int off, int sz) throws IOException { |
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129 return (fin != null) ? fin.read(b, off, sz) : -1; |
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130 } |
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131 |
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132 @Override |
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133 public void close() throws IOException { |
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134 if (fin != null) { |
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135 fin.close(); |
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136 } |
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137 if (tempFile != null) { |
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138 tempFile.delete(); |
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139 } |
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140 } |
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141 } |
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142 |
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143 // Keeps data in memory until certain size |
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144 private static class MemoryStream extends InputStream { |
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145 private Chunk head, tail; |
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146 private int curOff; |
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147 |
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148 private void add(byte[] buf, int len) { |
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149 if (tail != null) { |
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150 tail = tail.createNext(buf, 0, len); |
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151 } else { |
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152 head = tail = new Chunk(buf, 0, len); |
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153 } |
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154 } |
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155 |
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156 /** |
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157 * Reads until the size specified |
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158 * |
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159 * @param in stream from which to be read |
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160 * @param inMemory reads until this size |
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161 * @return true if eof |
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162 * false otherwise |
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163 * @throws IOException in case of exception |
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164 */ |
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165 boolean readAll(InputStream in, long inMemory) throws IOException { |
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166 long total = 0; |
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167 while(true) { |
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168 byte[] buf = new byte[8192]; |
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169 int read = fill(in, buf); |
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170 total += read; |
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171 if (read != 0) |
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172 add(buf, read); |
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173 if (read != buf.length) |
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174 return true; // EOF |
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175 if (total > inMemory) |
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176 return false; // Reached in-memory size |
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177 } |
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178 } |
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179 |
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180 private int fill(InputStream in, byte[] buf) throws IOException { |
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181 int read; |
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182 int total = 0; |
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183 while(total < buf.length && (read=in.read(buf, total, buf.length-total)) != -1) { |
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184 total += read; |
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185 } |
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186 return total; |
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187 } |
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188 |
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189 public int read() throws IOException { |
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190 if (!fetch()) { |
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191 return -1; |
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192 } |
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193 return (head.buf[curOff++] & 0xff); |
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194 } |
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195 |
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196 @Override |
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197 public int read(byte b[], int off, int sz) throws IOException { |
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198 if (!fetch()) { |
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199 return -1; |
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200 } |
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201 sz = Math.min(sz, head.len-(curOff-head.off)); |
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202 System.arraycopy(head.buf,curOff,b,off,sz); |
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203 curOff += sz; |
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204 return sz; |
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205 } |
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206 |
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207 // if eof, return false else true |
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208 private boolean fetch() { |
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209 if (head == null) { |
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210 return false; |
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211 } |
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212 if (curOff == head.off+head.len) { |
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213 head = head.next; |
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214 if (head == null) { |
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215 return false; |
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216 } |
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217 curOff = head.off; |
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218 } |
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219 return true; |
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220 } |
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221 |
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222 private static final class Chunk { |
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223 Chunk next; |
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224 final byte[] buf; |
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225 final int off; |
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226 final int len; |
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227 |
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228 public Chunk(byte[] buf, int off, int len) { |
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229 this.buf = buf; |
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230 this.off = off; |
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231 this.len = len; |
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232 } |
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233 |
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234 public Chunk createNext(byte[] buf, int off, int len) { |
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235 return next = new Chunk(buf, off, len); |
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236 } |
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237 } |
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238 } |
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239 } |