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| 1 | +/* |
| 2 | + * Jooby https://jooby.io |
| 3 | + * Apache License Version 2.0 https://jooby.io/LICENSE.txt |
| 4 | + * Copyright 2014 Edgar Espina |
| 5 | + */ |
| 6 | +package io.jooby.internal.jackson; |
| 7 | + |
| 8 | +import java.io.IOException; |
| 9 | + |
| 10 | +import com.fasterxml.jackson.core.JsonParser; |
| 11 | +import com.fasterxml.jackson.core.JsonToken; |
| 12 | +import io.jooby.SneakyThrows; |
| 13 | +import io.jooby.exception.MissingValueException; |
| 14 | +import io.jooby.trpc.TrpcDecoder; |
| 15 | +import io.jooby.trpc.TrpcReader; |
| 16 | + |
| 17 | +public class JacksonTrpcReader implements TrpcReader { |
| 18 | + private final JsonParser parser; |
| 19 | + private boolean hasPeeked = false; |
| 20 | + private final boolean isTuple; |
| 21 | + private boolean isFirstRead = true; |
| 22 | + |
| 23 | + public JacksonTrpcReader(JsonParser parser, boolean isTuple) { |
| 24 | + this.parser = parser; |
| 25 | + this.isTuple = isTuple; |
| 26 | + var token = nextToken(); |
| 27 | + if (isTuple && token != JsonToken.START_ARRAY) { |
| 28 | + throw new IllegalArgumentException("Expected tRPC tuple array"); |
| 29 | + } |
| 30 | + } |
| 31 | + |
| 32 | + private JsonToken nextToken() { |
| 33 | + try { |
| 34 | + return parser.nextToken(); |
| 35 | + } catch (IOException e) { |
| 36 | + throw SneakyThrows.propagate(e); |
| 37 | + } |
| 38 | + } |
| 39 | + |
| 40 | + @Override |
| 41 | + public boolean nextIsNull(String name) { |
| 42 | + if (!hasPeeked) { |
| 43 | + advance(name); |
| 44 | + hasPeeked = true; |
| 45 | + } |
| 46 | + |
| 47 | + if (parser.currentToken() == JsonToken.VALUE_NULL) { |
| 48 | + hasPeeked = false; // Consume the null token |
| 49 | + return true; |
| 50 | + } |
| 51 | + |
| 52 | + return false; |
| 53 | + } |
| 54 | + |
| 55 | + private void ensureNext(String name) { |
| 56 | + if (hasPeeked) { |
| 57 | + hasPeeked = false; |
| 58 | + return; |
| 59 | + } |
| 60 | + advance(name); |
| 61 | + } |
| 62 | + |
| 63 | + private void ensureNonNull(String name) { |
| 64 | + if (parser.currentToken() == JsonToken.VALUE_NULL) throw new MissingValueException(name); |
| 65 | + } |
| 66 | + |
| 67 | + private void advance(String name) { |
| 68 | + // If it's a seamless raw value, we are ALREADY on the token. Do not advance. |
| 69 | + if (!isTuple) { |
| 70 | + if (!isFirstRead) throw new MissingValueException(name); |
| 71 | + isFirstRead = false; |
| 72 | + // The constructor already positioned us on the root token. Do not advance. |
| 73 | + return; |
| 74 | + } |
| 75 | + |
| 76 | + var token = nextToken(); |
| 77 | + if (token == JsonToken.END_ARRAY || token == null) { |
| 78 | + throw new MissingValueException(name); |
| 79 | + } |
| 80 | + } |
| 81 | + |
| 82 | + @Override |
| 83 | + public int nextInt(String name) { |
| 84 | + ensureNext(name); |
| 85 | + ensureNonNull(name); |
| 86 | + try { |
| 87 | + return parser.getIntValue(); |
| 88 | + } catch (IOException e) { |
| 89 | + throw SneakyThrows.propagate(e); |
| 90 | + } |
| 91 | + } |
| 92 | + |
| 93 | + @Override |
| 94 | + public long nextLong(String name) { |
| 95 | + ensureNext(name); |
| 96 | + ensureNonNull(name); |
| 97 | + try { |
| 98 | + return parser.getLongValue(); |
| 99 | + } catch (IOException e) { |
| 100 | + throw SneakyThrows.propagate(e); |
| 101 | + } |
| 102 | + } |
| 103 | + |
| 104 | + @Override |
| 105 | + public boolean nextBoolean(String name) { |
| 106 | + ensureNext(name); |
| 107 | + ensureNonNull(name); |
| 108 | + try { |
| 109 | + return parser.getBooleanValue(); |
| 110 | + } catch (IOException e) { |
| 111 | + throw SneakyThrows.propagate(e); |
| 112 | + } |
| 113 | + } |
| 114 | + |
| 115 | + @Override |
| 116 | + public double nextDouble(String name) { |
| 117 | + ensureNext(name); |
| 118 | + ensureNonNull(name); |
| 119 | + try { |
| 120 | + return parser.getDoubleValue(); |
| 121 | + } catch (IOException e) { |
| 122 | + throw SneakyThrows.propagate(e); |
| 123 | + } |
| 124 | + } |
| 125 | + |
| 126 | + @Override |
| 127 | + public String nextString(String name) { |
| 128 | + ensureNext(name); |
| 129 | + ensureNonNull(name); |
| 130 | + try { |
| 131 | + return parser.getText(); |
| 132 | + } catch (IOException e) { |
| 133 | + throw SneakyThrows.propagate(e); |
| 134 | + } |
| 135 | + } |
| 136 | + |
| 137 | + @Override |
| 138 | + public <T> T nextObject(String name, TrpcDecoder<T> decoder) { |
| 139 | + try { |
| 140 | + ensureNext(name); |
| 141 | + ensureNonNull(name); |
| 142 | + JacksonTrpcDecoder<T> jacksonDecoder = (JacksonTrpcDecoder<T>) decoder; |
| 143 | + return jacksonDecoder.reader.readValue(parser); |
| 144 | + } catch (IOException e) { |
| 145 | + throw SneakyThrows.propagate(e); |
| 146 | + } |
| 147 | + } |
| 148 | + |
| 149 | + @Override |
| 150 | + public void close() throws Exception { |
| 151 | + parser.close(); |
| 152 | + } |
| 153 | +} |
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