78 lines
2.4 KiB
Java
78 lines
2.4 KiB
Java
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/*
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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.EOFException;
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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 that allows reading of multiple {@link JsonElement}s from the specified reader
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* asynchronously.
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*
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* @author Inderjeet Singh
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* @author Joel Leitch
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* @since 1.4
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*/
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public final class JsonParserAsync {
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private final JsonParserJavacc parser;
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/**
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* @param json The string containing JSON elements concatenated to each other.
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* @since 1.4
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*/
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public JsonParserAsync(String json) {
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this(new StringReader(json));
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}
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/**
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* @param reader The data stream containing JSON elements concatenated to each other.
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* @since 1.4
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*/
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public JsonParserAsync(Reader reader) {
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parser = new JsonParserJavacc(reader);
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}
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/**
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* Returns the next available {@link JsonElement} on the reader. Null if none available.
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*
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* @return the next available {@link JsonElement} on the reader. Null if none available.
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* @throws JsonParseException if the incoming stream is malformed JSON.
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* @since 1.4
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*/
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public JsonElement nextElement() throws JsonParseException {
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try {
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JsonElement element = parser.parse();
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return element;
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} catch (TokenMgrError e) {
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throw new JsonParseException("Failed parsing JSON source to Json", e);
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} catch (ParseException e) {
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throw new JsonParseException("Failed parsing JSON source to Json", e);
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} catch (StackOverflowError e) {
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throw new JsonParseException("Failed parsing JSON source to Json", e);
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} catch (OutOfMemoryError e) {
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throw new JsonParseException("Failed parsing JSON source to Json", e);
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} catch (JsonParseException e) {
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if (e.getCause() instanceof EOFException) {
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return null;
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} else {
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throw e;
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}
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}
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}
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}
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