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1 /* |
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2 * Copyright (c) 1997, 2012, 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 java.io.ByteArrayInputStream; |
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29 import java.io.ByteArrayOutputStream; |
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30 import java.io.IOException; |
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31 import java.io.InputStream; |
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32 import java.io.OutputStream; |
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33 |
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34 /** |
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35 * Read/write buffer that stores a sequence of bytes. |
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36 * |
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37 * <p> |
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38 * It works in a way similar to {@link ByteArrayOutputStream} but |
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39 * this class works better in the following ways: |
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40 * |
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41 * <ol> |
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42 * <li>no synchronization |
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43 * <li>offers a {@link #newInputStream()} that creates a new {@link InputStream} |
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44 * that won't cause buffer reallocation. |
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45 * <li>less parameter correctness checking |
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46 * <li>offers a {@link #write(InputStream)} method that reads the entirety of the |
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47 * given {@link InputStream} without using a temporary buffer. |
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48 * </ol> |
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49 * |
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50 * @author Kohsuke Kawaguchi |
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51 */ |
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52 public class ByteArrayBuffer extends OutputStream { |
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53 /** |
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54 * The buffer where data is stored. |
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55 */ |
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56 protected byte[] buf; |
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57 |
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58 /** |
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59 * The number of valid bytes in the buffer. |
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60 */ |
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61 private int count; |
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62 |
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63 private static final int CHUNK_SIZE = 4096; |
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64 |
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65 /** |
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66 * Creates a new byte array output stream. The buffer capacity is |
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67 * initially 32 bytes, though its size increases if necessary. |
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68 */ |
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69 public ByteArrayBuffer() { |
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70 this(32); |
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71 } |
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72 |
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73 /** |
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74 * Creates a new byte array output stream, with a buffer capacity of |
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75 * the specified size, in bytes. |
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76 * |
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77 * @param size the initial size. |
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78 * @throws IllegalArgumentException if size is negative. |
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79 */ |
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80 public ByteArrayBuffer(int size) { |
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81 if (size <= 0) |
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82 throw new IllegalArgumentException(); |
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83 buf = new byte[size]; |
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84 } |
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85 |
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86 public ByteArrayBuffer(byte[] data) { |
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87 this(data,data.length); |
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88 } |
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89 |
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90 public ByteArrayBuffer(byte[] data, int length) { |
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91 this.buf = data; |
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92 this.count = length; |
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93 } |
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94 |
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95 /** |
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96 * Reads all the data of the given {@link InputStream} and appends them |
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97 * into this buffer. |
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98 * |
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99 * @throws IOException |
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100 * if the read operation fails with an {@link IOException}. |
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101 */ |
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102 public final void write(InputStream in) throws IOException { |
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103 while(true) { |
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104 int cap = buf.length-count; // the remaining buffer space |
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105 int sz = in.read(buf,count,cap); |
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106 if(sz<0) return; // hit EOS |
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107 count += sz; |
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108 |
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109 |
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110 if(cap==sz) |
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111 ensureCapacity(buf.length*2); // buffer filled up. |
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112 } |
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113 } |
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114 |
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115 public final void write(int b) { |
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116 int newcount = count + 1; |
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117 ensureCapacity(newcount); |
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118 buf[count] = (byte) b; |
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119 count = newcount; |
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120 } |
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121 |
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122 public final void write(byte b[], int off, int len) { |
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123 int newcount = count + len; |
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124 ensureCapacity(newcount); |
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125 System.arraycopy(b, off, buf, count, len); |
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126 count = newcount; |
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127 } |
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128 |
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129 private void ensureCapacity(int newcount) { |
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130 if (newcount > buf.length) { |
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131 byte newbuf[] = new byte[Math.max(buf.length << 1, newcount)]; |
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132 System.arraycopy(buf, 0, newbuf, 0, count); |
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133 buf = newbuf; |
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134 } |
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135 } |
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136 |
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137 public final void writeTo(OutputStream out) throws IOException { |
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138 // Instead of writing out.write(buf, 0, count) |
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139 // Writing it in chunks that would help larger payloads |
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140 // Also if out is System.out on windows, it doesn't show on the console |
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141 // for larger data. |
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142 int remaining = count; |
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143 int off = 0; |
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144 while(remaining > 0) { |
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145 int chunk = (remaining > CHUNK_SIZE) ? CHUNK_SIZE : remaining; |
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146 out.write(buf, off, chunk); |
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147 remaining -= chunk; |
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148 off += chunk; |
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149 } |
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150 } |
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151 |
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152 public final void reset() { |
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153 count = 0; |
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154 } |
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155 |
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156 /** |
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157 * Gets the <b>copy</b> of exact-size byte[] that represents the written data. |
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158 * |
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159 * <p> |
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160 * Since this method needs to allocate a new byte[], this method will be costly. |
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161 * |
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162 * @deprecated |
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163 * this method causes a buffer reallocation. Use it only when |
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164 * you have to. |
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165 */ |
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166 public final byte[] toByteArray() { |
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167 byte newbuf[] = new byte[count]; |
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168 System.arraycopy(buf, 0, newbuf, 0, count); |
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169 return newbuf; |
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170 } |
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171 |
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172 public final int size() { |
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173 return count; |
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174 } |
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175 |
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176 /** |
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177 * Gets the underlying buffer that this {@link ByteArrayBuffer} uses. |
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178 * It's never small than its {@link #size()}. |
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179 * |
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180 * Use with caution. |
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181 */ |
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182 public final byte[] getRawData() { |
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183 return buf; |
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184 } |
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185 |
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186 public void close() throws IOException { |
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187 } |
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188 |
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189 /** |
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190 * Creates a new {@link InputStream} that reads from this buffer. |
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191 */ |
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192 public final InputStream newInputStream() { |
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193 return new ByteArrayInputStream(buf,0,count); |
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194 } |
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195 |
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196 /** |
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197 * Creates a new {@link InputStream} that reads a part of this bfufer. |
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198 */ |
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199 public final InputStream newInputStream(int start, int length) { |
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200 return new ByteArrayInputStream(buf,start,length); |
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201 } |
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202 |
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203 /** |
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204 * Decodes the contents of this buffer by the default encoding |
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205 * and returns it as a string. |
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206 * |
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207 * <p> |
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208 * Meant to aid debugging, but no more. |
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209 */ |
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210 public String toString() { |
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211 return new String(buf, 0, count); |
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212 } |
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213 } |