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Implement stream methods in JsonStructureParser; fulfill more of JSON…
…P Parser in it & JsonParserImpl; higher code coverage Signed-off-by: Anton Pinsky <anton.pinsky@ionos.com>
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impl/src/main/java/org/eclipse/parsson/JsonParserStreamCreator.java
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| /* | ||
| * Copyright (c) 2023 Oracle and/or its affiliates. All rights reserved. | ||
| * | ||
| * This program and the accompanying materials are made available under the | ||
| * terms of the Eclipse Public License v. 2.0, which is available at | ||
| * http://www.eclipse.org/legal/epl-2.0. | ||
| * | ||
| * This Source Code may also be made available under the following Secondary | ||
| * Licenses when the conditions for such availability set forth in the | ||
| * Eclipse Public License v. 2.0 are satisfied: GNU General Public License, | ||
| * version 2 with the GNU Classpath Exception, which is available at | ||
| * https://www.gnu.org/software/classpath/license.html. | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 | ||
| */ | ||
|
|
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| package org.eclipse.parsson; | ||
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|
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| import java.util.AbstractMap; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
| import java.util.function.Supplier; | ||
| import java.util.stream.Stream; | ||
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|
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| import jakarta.json.JsonException; | ||
| import jakarta.json.JsonValue; | ||
| import jakarta.json.stream.JsonParser; | ||
| import jakarta.json.stream.JsonParser.Event; | ||
|
|
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| class JsonParserStreamCreator { | ||
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|
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| private final JsonParser parser; | ||
| private final boolean nextBeforeCreationOfValueStream; | ||
| private final Supplier<Event> currenEventSupplier; | ||
| private final Supplier<Boolean> canProduceValueStream; | ||
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|
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| JsonParserStreamCreator(JsonParser parser, boolean nextBeforeCreationOfValueStream, Supplier<Event> currenEventSupplier, | ||
| Supplier<Boolean> canProduceValueStream) { | ||
|
|
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| this.parser = Objects.requireNonNull(parser); | ||
| this.nextBeforeCreationOfValueStream = nextBeforeCreationOfValueStream; | ||
| this.currenEventSupplier = Objects.requireNonNull(currenEventSupplier); | ||
| this.canProduceValueStream = Objects.requireNonNull(canProduceValueStream); | ||
| } | ||
|
|
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| /** | ||
| * Creates new {@link Stream} from values from {@link Supplier}. The stream delivers the values as long as supplier delivers non-null values | ||
| * | ||
| * @param supplier supplier of the values | ||
| * @param <T> type of the values which are delivered by the supplier and the stream | ||
| * @return stream of values from given supplier | ||
| */ | ||
| private static <T> Stream<T> streamFromSupplier(Supplier<T> supplier) { | ||
| return StreamCreator.iterate(Objects.requireNonNull(supplier).get(), Objects::nonNull, value -> supplier.get()); | ||
| } | ||
|
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| public Stream<JsonValue> getArrayStream() { | ||
| if (currenEventSupplier.get() == Event.START_ARRAY) { | ||
| return streamFromSupplier(() -> (parser.hasNext() && parser.next() != Event.END_ARRAY) ? parser.getValue() : null); | ||
| } else { | ||
| throw new IllegalStateException(JsonMessages.PARSER_GETARRAY_ERR(parser.currentEvent())); | ||
| } | ||
| } | ||
|
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| public Stream<Map.Entry<String, JsonValue>> getObjectStream() { | ||
| if (currenEventSupplier.get() == Event.START_OBJECT) { | ||
| return streamFromSupplier(() -> { | ||
| if (!parser.hasNext()) { | ||
| return null; | ||
| } | ||
| Event e = parser.next(); | ||
| if (e == Event.END_OBJECT) { | ||
| return null; | ||
| } else if (e != Event.KEY_NAME) { | ||
| throw new JsonException(JsonMessages.INTERNAL_ERROR()); | ||
| } else { | ||
| String key = parser.getString(); | ||
| if (!parser.hasNext()) { | ||
| throw new JsonException(JsonMessages.INTERNAL_ERROR()); | ||
| } else { | ||
| parser.next(); | ||
| return new AbstractMap.SimpleImmutableEntry<>(key, parser.getValue()); | ||
| } | ||
| } | ||
| }); | ||
| } else { | ||
| throw new IllegalStateException(JsonMessages.PARSER_GETOBJECT_ERR(parser.currentEvent())); | ||
| } | ||
| } | ||
|
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| public Stream<JsonValue> getValueStream() { | ||
| if (canProduceValueStream.get()) { | ||
| if (nextBeforeCreationOfValueStream) { | ||
| parser.next(); | ||
| } | ||
|
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| return streamFromSupplier(() -> { | ||
| if (parser.hasNext()) { | ||
| return parser.getValue(); | ||
| } else { | ||
| return null; | ||
| } | ||
| }); | ||
| } else { | ||
| throw new IllegalStateException(JsonMessages.PARSER_GETVALUESTREAM_ERR()); | ||
| } | ||
| } | ||
| } |
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