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Add
from_json()/to_json() Fix functions.
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87 changes: 87 additions & 0 deletions
87
metafix/src/main/java/org/metafacture/metafix/JsonValue.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| /* | ||
| * Copyright 2022 hbz NRW | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 the "License"; | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
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| package org.metafacture.metafix; | ||
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| import com.fasterxml.jackson.core.JsonFactory; | ||
| import com.fasterxml.jackson.core.JsonGenerator; | ||
| import com.fasterxml.jackson.core.SerializableString; | ||
| import com.fasterxml.jackson.core.util.DefaultPrettyPrinter; | ||
| import com.fasterxml.jackson.databind.JsonNode; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
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| import java.io.IOException; | ||
| import java.io.StringWriter; | ||
| import java.io.UncheckedIOException; | ||
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| // TODO: Utilize JsonDecoder/JsonEncoder instead? | ||
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| @FunctionalInterface | ||
| public interface JsonValue { | ||
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| void toJson(JsonGenerator jsonGenerator); | ||
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| default String toJson() throws IOException { | ||
| return toJson(false); | ||
| } | ||
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| default String toJson(final boolean prettyPrinting) throws IOException { | ||
| final StringWriter writer = new StringWriter(); | ||
| final JsonGenerator jsonGenerator = new JsonFactory().createGenerator(writer); | ||
| jsonGenerator.setPrettyPrinter(prettyPrinting ? new DefaultPrettyPrinter((SerializableString) null) : null); | ||
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| try { | ||
| toJson(jsonGenerator); | ||
| } | ||
| catch (final UncheckedIOException e) { | ||
| throw e.getCause(); | ||
| } | ||
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| jsonGenerator.flush(); | ||
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| return writer.toString(); | ||
| } | ||
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| class Parser { | ||
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| private static final ObjectMapper MAPPER = new ObjectMapper(); | ||
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| public Parser() { | ||
| } | ||
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| public Value parse(final String source) throws IOException { | ||
| return parse(MAPPER.readTree(source)); | ||
| } | ||
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| private Value parse(final JsonNode node) { | ||
| final Value value; | ||
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| if (node.isObject()) { | ||
| value = Value.newHash(h -> node.fields().forEachRemaining(e -> h.put(e.getKey(), parse(e.getValue())))); | ||
| } | ||
| else if (node.isArray()) { | ||
| value = Value.newArray(a -> node.elements().forEachRemaining(v -> a.add(parse(v)))); | ||
| } | ||
| else { | ||
| value = new Value(node.textValue()); | ||
| } | ||
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| return value; | ||
| } | ||
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| } | ||
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| } |
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