94 lines
3.1 KiB
Java
94 lines
3.1 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 java.io.IOException;
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import java.io.Reader;
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import java.io.StringReader;
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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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/**
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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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* Parses the specified JSON string into a parse tree
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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 1.3
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*/
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public JsonElement parse(String json) throws JsonSyntaxException {
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return parse(new StringReader(json));
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}
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/**
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* Parses the specified JSON string into a parse tree
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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 1.3
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*/
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public JsonElement parse(Reader json) throws JsonIOException, JsonSyntaxException {
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try {
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JsonReader jsonReader = new JsonReader(json);
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JsonElement element = parse(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.
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*
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* @throws JsonParseException if there is an IOException or if the specified
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* text is not valid JSON
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* @since 1.6
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*/
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public JsonElement parse(JsonReader json) throws JsonIOException, JsonSyntaxException {
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boolean lenient = json.isLenient();
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json.setLenient(true);
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try {
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return Streams.parse(json);
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} catch (StackOverflowError e) {
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throw new JsonParseException("Failed parsing JSON source: " + json + " to Json", e);
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} catch (OutOfMemoryError e) {
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throw new JsonParseException("Failed parsing JSON source: " + json + " to Json", e);
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} finally {
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json.setLenient(lenient);
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}
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}
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}
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