Tatu Saloranta | 81fb43c | 2017-05-17 18:25:34 -0700 | [diff] [blame^] | 1 | package com.fasterxml.jackson.core.json.async; |
| 2 | |
| 3 | import java.io.IOException; |
| 4 | import java.io.OutputStream; |
| 5 | |
| 6 | import com.fasterxml.jackson.core.JsonToken; |
| 7 | import com.fasterxml.jackson.core.async.ByteArrayFeeder; |
| 8 | import com.fasterxml.jackson.core.async.NonBlockingInputFeeder; |
| 9 | import com.fasterxml.jackson.core.io.IOContext; |
| 10 | import com.fasterxml.jackson.core.sym.ByteQuadsCanonicalizer; |
| 11 | import com.fasterxml.jackson.core.util.VersionUtil; |
| 12 | |
| 13 | public class NonBlockingJsonParser |
| 14 | extends NonBlockingJsonParserBase |
| 15 | implements ByteArrayFeeder |
| 16 | { |
| 17 | /* |
| 18 | /********************************************************************** |
| 19 | /* Input source config |
| 20 | /********************************************************************** |
| 21 | */ |
| 22 | |
| 23 | /** |
| 24 | * This buffer is actually provided via {@link NonBlockingInputFeeder} |
| 25 | */ |
| 26 | protected byte[] _inputBuffer = NO_BYTES; |
| 27 | |
| 28 | /** |
| 29 | * In addition to current buffer pointer, and end pointer, |
| 30 | * we will also need to know number of bytes originally |
| 31 | * contained. This is needed to correctly update location |
| 32 | * information when the block has been completed. |
| 33 | */ |
| 34 | protected int _origBufferLen; |
| 35 | |
| 36 | // And from ParserBase: |
| 37 | // protected int _inputPtr; |
| 38 | // protected int _inputEnd; |
| 39 | |
| 40 | /* |
| 41 | /********************************************************************** |
| 42 | /* Life-cycle |
| 43 | /********************************************************************** |
| 44 | */ |
| 45 | |
| 46 | public NonBlockingJsonParser(IOContext ctxt, int parserFeatures, |
| 47 | ByteQuadsCanonicalizer sym) |
| 48 | { |
| 49 | super(ctxt, parserFeatures, sym); |
| 50 | } |
| 51 | |
| 52 | /* |
| 53 | /********************************************************************** |
| 54 | /* AsyncInputFeeder impl |
| 55 | /********************************************************************** |
| 56 | */ |
| 57 | |
| 58 | @Override |
| 59 | public ByteArrayFeeder getNonBlockingInputFeeder() { |
| 60 | return this; |
| 61 | } |
| 62 | |
| 63 | @Override |
| 64 | public final boolean needMoreInput() { |
| 65 | return (_inputPtr >=_inputEnd) && !_endOfInput; |
| 66 | } |
| 67 | |
| 68 | @Override |
| 69 | public void feedInput(byte[] buf, int start, int end) throws IOException |
| 70 | { |
| 71 | // Must not have remaining input |
| 72 | if (_inputPtr < _inputEnd) { |
| 73 | _reportError("Still have %d undecoded bytes, should not call 'feedInput'", _inputEnd - _inputPtr); |
| 74 | } |
| 75 | if (end < start) { |
| 76 | _reportError("Input end (%d) may not be before start (%d)", end, start); |
| 77 | } |
| 78 | // and shouldn't have been marked as end-of-input |
| 79 | if (_endOfInput) { |
| 80 | _reportError("Already closed, can not feed more input"); |
| 81 | } |
| 82 | // Time to update pointers first |
| 83 | _currInputProcessed += _origBufferLen; |
| 84 | |
| 85 | // And then update buffer settings |
| 86 | _inputBuffer = buf; |
| 87 | _inputPtr = start; |
| 88 | _inputEnd = end; |
| 89 | _origBufferLen = end - start; |
| 90 | } |
| 91 | |
| 92 | @Override |
| 93 | public void endOfInput() { |
| 94 | _endOfInput = true; |
| 95 | } |
| 96 | |
| 97 | /* |
| 98 | /********************************************************************** |
| 99 | /* Abstract methods/overrides from JsonParser |
| 100 | /********************************************************************** |
| 101 | */ |
| 102 | |
| 103 | /* Implementing these methods efficiently for non-blocking cases would |
| 104 | * be complicated; so for now let's just use the default non-optimized |
| 105 | * implementation |
| 106 | */ |
| 107 | |
| 108 | // public boolean nextFieldName(SerializableString str) throws IOException |
| 109 | // public String nextTextValue() throws IOException |
| 110 | // public int nextIntValue(int defaultValue) throws IOException |
| 111 | // public long nextLongValue(long defaultValue) throws IOException |
| 112 | // public Boolean nextBooleanValue() throws IOException |
| 113 | |
| 114 | @Override |
| 115 | public int releaseBuffered(OutputStream out) throws IOException { |
| 116 | int avail = _inputEnd - _inputPtr; |
| 117 | if (avail > 0) { |
| 118 | out.write(_inputBuffer, _inputPtr, avail); |
| 119 | } |
| 120 | return avail; |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | /********************************************************************** |
| 125 | /* Main-level decoding |
| 126 | /********************************************************************** |
| 127 | */ |
| 128 | |
| 129 | @Override |
| 130 | public JsonToken nextToken() throws IOException |
| 131 | { |
| 132 | // First: regardless of where we really are, need at least one more byte; |
| 133 | // can simplify some of the checks by short-circuiting right away |
| 134 | if (_inputPtr >= _inputEnd) { |
| 135 | if (_closed) { |
| 136 | return null; |
| 137 | } |
| 138 | // note: if so, do not even bother changing state |
| 139 | if (_endOfInput) { // except for this special case |
| 140 | return _eofAsNextToken(); |
| 141 | } |
| 142 | return JsonToken.NOT_AVAILABLE; |
| 143 | } |
| 144 | // in the middle of tokenization? |
| 145 | if (_currToken == JsonToken.NOT_AVAILABLE) { |
| 146 | return _finishToken(); |
| 147 | } |
| 148 | |
| 149 | // No: fresh new token; may or may not have existing one |
| 150 | _numTypesValid = NR_UNKNOWN; |
| 151 | // _tokenInputTotal = _currInputProcessed + _inputPtr; |
| 152 | // also: clear any data retained so far |
| 153 | _binaryValue = null; |
| 154 | int ch = _inputBuffer[_inputPtr++]; |
| 155 | |
| 156 | switch (_majorState) { |
| 157 | case MAJOR_INITIAL: |
| 158 | // TODO: Bootstrapping? BOM? |
| 159 | |
| 160 | case MAJOR_ROOT: |
| 161 | return _startValue(ch); |
| 162 | |
| 163 | case MAJOR_OBJECT_FIELD: // field or end-object |
| 164 | // expect name |
| 165 | return _startFieldName(ch); |
| 166 | |
| 167 | case MAJOR_OBJECT_VALUE: |
| 168 | case MAJOR_ARRAY_ELEMENT: // element or end-array |
| 169 | return _startValue(ch); |
| 170 | |
| 171 | default: |
| 172 | } |
| 173 | VersionUtil.throwInternal(); |
| 174 | return null; |
| 175 | } |
| 176 | |
| 177 | /** |
| 178 | * Method called when a (scalar) value type has been detected, but not all of |
| 179 | * contents have been decoded due to incomplete input available. |
| 180 | */ |
| 181 | protected final JsonToken _finishToken() throws IOException |
| 182 | { |
| 183 | // NOTE: caller ensures availability of at least one byte |
| 184 | |
| 185 | switch (_minorState) { |
| 186 | } |
| 187 | return null; |
| 188 | } |
| 189 | |
| 190 | /* |
| 191 | /********************************************************************** |
| 192 | /* Second-level decoding, root level |
| 193 | /********************************************************************** |
| 194 | */ |
| 195 | |
| 196 | /** |
| 197 | * Helper method called to detect type of a value token (at any level), and possibly |
| 198 | * decode it if contained in input buffer. |
| 199 | * Note that possible header has been ruled out by caller and is not checked here. |
| 200 | */ |
| 201 | private final JsonToken _startValue(int ch) throws IOException |
| 202 | { |
| 203 | return null; |
| 204 | } |
| 205 | |
| 206 | /* |
| 207 | /********************************************************************** |
| 208 | /* Second-level decoding, Name decoding |
| 209 | /********************************************************************** |
| 210 | */ |
| 211 | |
| 212 | /** |
| 213 | * Method that handles initial token type recognition for token |
| 214 | * that has to be either FIELD_NAME or END_OBJECT. |
| 215 | */ |
| 216 | protected final JsonToken _startFieldName(int ch) throws IOException |
| 217 | { |
| 218 | return null; |
| 219 | } |
| 220 | } |