140 lines
5.2 KiB
Java
140 lines
5.2 KiB
Java
/*
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* Copyright (C) 2009 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson;
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import com.google.errorprone.annotations.InlineMe;
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import com.google.gson.internal.Streams;
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import com.google.gson.stream.JsonReader;
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import com.google.gson.stream.JsonToken;
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import com.google.gson.stream.MalformedJsonException;
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import java.io.IOException;
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import java.io.Reader;
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import java.io.StringReader;
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/**
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* A parser to parse JSON into a parse tree of {@link JsonElement}s.
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*
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* @author Inderjeet Singh
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* @author Joel Leitch
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* @since 1.3
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*/
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public final class JsonParser {
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/**
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* @deprecated No need to instantiate this class, use the static methods instead.
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*/
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@Deprecated
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public JsonParser() {}
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/**
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* Parses the specified JSON string into a parse tree. An exception is thrown if the JSON string
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* has multiple top-level JSON elements, or if there is trailing data.
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*
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* <p>The JSON string is parsed in {@linkplain JsonReader#setStrictness(Strictness) lenient mode}.
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*
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* @param json JSON text
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* @return a parse tree of {@link JsonElement}s corresponding to the specified JSON
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* @throws JsonParseException if the specified text is not valid JSON
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* @since 2.8.6
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*/
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public static JsonElement parseString(String json) throws JsonSyntaxException {
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return parseReader(new StringReader(json));
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}
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/**
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* Parses the complete JSON string provided by the reader into a parse tree. An exception is
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* thrown if the JSON string has multiple top-level JSON elements, or if there is trailing data.
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*
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* <p>The JSON data is parsed in {@linkplain JsonReader#setStrictness(Strictness) lenient mode}.
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*
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* @param reader JSON text
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* @return a parse tree of {@link JsonElement}s corresponding to the specified JSON
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* @throws JsonParseException if there is an IOException or if the specified text is not valid
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* JSON
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* @since 2.8.6
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*/
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public static JsonElement parseReader(Reader reader) throws JsonIOException, JsonSyntaxException {
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try {
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JsonReader jsonReader = new JsonReader(reader);
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JsonElement element = parseReader(jsonReader);
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if (!element.isJsonNull() && jsonReader.peek() != JsonToken.END_DOCUMENT) {
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throw new JsonSyntaxException("Did not consume the entire document.");
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}
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return element;
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} catch (MalformedJsonException e) {
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throw new JsonSyntaxException(e);
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} catch (IOException e) {
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throw new JsonIOException(e);
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} catch (NumberFormatException e) {
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throw new JsonSyntaxException(e);
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}
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}
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/**
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* Returns the next value from the JSON stream as a parse tree. Unlike the other {@code parse}
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* methods, no exception is thrown if the JSON data has multiple top-level JSON elements, or if
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* there is trailing data.
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*
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* <p>The JSON data is parsed in {@linkplain JsonReader#setStrictness(Strictness) lenient mode},
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* regardless of the strictness setting of the provided reader. The strictness setting of the
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* reader is restored once this method returns.
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*
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* @throws JsonParseException if there is an IOException or if the specified text is not valid
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* JSON
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* @since 2.8.6
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*/
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public static JsonElement parseReader(JsonReader reader)
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throws JsonIOException, JsonSyntaxException {
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Strictness strictness = reader.getStrictness();
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reader.setStrictness(Strictness.LENIENT);
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try {
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return Streams.parse(reader);
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} catch (StackOverflowError e) {
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throw new JsonParseException("Failed parsing JSON source: " + reader + " to Json", e);
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} catch (OutOfMemoryError e) {
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throw new JsonParseException("Failed parsing JSON source: " + reader + " to Json", e);
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} finally {
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reader.setStrictness(strictness);
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}
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}
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/**
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* @deprecated Use {@link JsonParser#parseString}
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*/
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@Deprecated
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@InlineMe(replacement = "JsonParser.parseString(json)", imports = "com.google.gson.JsonParser")
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public JsonElement parse(String json) throws JsonSyntaxException {
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return parseString(json);
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}
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/**
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* @deprecated Use {@link JsonParser#parseReader(Reader)}
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*/
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@Deprecated
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@InlineMe(replacement = "JsonParser.parseReader(json)", imports = "com.google.gson.JsonParser")
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public JsonElement parse(Reader json) throws JsonIOException, JsonSyntaxException {
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return parseReader(json);
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}
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/**
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* @deprecated Use {@link JsonParser#parseReader(JsonReader)}
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*/
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@Deprecated
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@InlineMe(replacement = "JsonParser.parseReader(json)", imports = "com.google.gson.JsonParser")
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public JsonElement parse(JsonReader json) throws JsonIOException, JsonSyntaxException {
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return parseReader(json);
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}
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}
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