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Java example source code file (JsonParser.java)

This example Java source code file (JsonParser.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

did, failed, json, jsonelement, jsonioexception, jsonparseexception, jsonparser, jsonreader, jsonsyntaxexception, malformedjsonexception, numberformatexception, outofmemoryerror, stackoverflowerror, stringreader

The JsonParser.java Java example source code

/*
 * Copyright (C) 2009 Google Inc.
 *
 * 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.
 */
package com.google.gson;

import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;

import com.google.gson.internal.Streams;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.MalformedJsonException;

/**
 * A parser to parse Json into a parse tree of {@link JsonElement}s
 *
 * @author Inderjeet Singh
 * @author Joel Leitch
 * @since 1.3
 */
public final class JsonParser {

  /**
   * Parses the specified JSON string into a parse tree
   *
   * @param json JSON text
   * @return a parse tree of {@link JsonElement}s corresponding to the specified JSON
   * @throws JsonParseException if the specified text is not valid JSON
   * @since 1.3
   */
  public JsonElement parse(String json) throws JsonSyntaxException {
    return parse(new StringReader(json));
  }

  /**
   * Parses the specified JSON string into a parse tree
   *
   * @param json JSON text
   * @return a parse tree of {@link JsonElement}s corresponding to the specified JSON
   * @throws JsonParseException if the specified text is not valid JSON
   * @since 1.3
   */
  public JsonElement parse(Reader json) throws JsonIOException, JsonSyntaxException {
    try {
      JsonReader jsonReader = new JsonReader(json);
      JsonElement element = parse(jsonReader);
      if (!element.isJsonNull() && jsonReader.peek() != JsonToken.END_DOCUMENT) {
        throw new JsonSyntaxException("Did not consume the entire document.");
      }
      return element;
    } catch (MalformedJsonException e) {
      throw new JsonSyntaxException(e);
    } catch (IOException e) {
      throw new JsonIOException(e);
    } catch (NumberFormatException e) {
      throw new JsonSyntaxException(e);
    }
  }

  /**
   * Returns the next value from the JSON stream as a parse tree.
   *
   * @throws JsonParseException if there is an IOException or if the specified
   *     text is not valid JSON
   * @since 1.6
   */
  public JsonElement parse(JsonReader json) throws JsonIOException, JsonSyntaxException {
    boolean lenient = json.isLenient();
    json.setLenient(true);
    try {
      return Streams.parse(json);
    } catch (StackOverflowError e) {
      throw new JsonParseException("Failed parsing JSON source: " + json + " to Json", e);
    } catch (OutOfMemoryError e) {
      throw new JsonParseException("Failed parsing JSON source: " + json + " to Json", e);
    } finally {
      json.setLenient(lenient);
    }
  }
}

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