github.com/keysonZZZ/kmg@v0.0.0-20151121023212-05317bfd7d39/kmgRpc/kmgRpcJava/java/src/com/google/gson/JsonParser.java (about)

     1  /*
     2   * Copyright (C) 2009 Google Inc.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   * http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  package com.google.gson;
    17  
    18  import java.io.IOException;
    19  import java.io.Reader;
    20  import java.io.StringReader;
    21  
    22  import com.google.gson.internal.Streams;
    23  import com.google.gson.stream.JsonReader;
    24  import com.google.gson.stream.JsonToken;
    25  import com.google.gson.stream.MalformedJsonException;
    26  
    27  /**
    28   * A parser to parse Json into a parse tree of {@link JsonElement}s
    29   *
    30   * @author Inderjeet Singh
    31   * @author Joel Leitch
    32   * @since 1.3
    33   */
    34  public final class JsonParser {
    35  
    36    /**
    37     * Parses the specified JSON string into a parse tree
    38     *
    39     * @param json JSON text
    40     * @return a parse tree of {@link JsonElement}s corresponding to the specified JSON
    41     * @throws JsonParseException if the specified text is not valid JSON
    42     * @since 1.3
    43     */
    44    public JsonElement parse(String json) throws JsonSyntaxException {
    45      return parse(new StringReader(json));
    46    }
    47  
    48    /**
    49     * Parses the specified JSON string into a parse tree
    50     *
    51     * @param json JSON text
    52     * @return a parse tree of {@link JsonElement}s corresponding to the specified JSON
    53     * @throws JsonParseException if the specified text is not valid JSON
    54     * @since 1.3
    55     */
    56    public JsonElement parse(Reader json) throws JsonIOException, JsonSyntaxException {
    57      try {
    58        JsonReader jsonReader = new JsonReader(json);
    59        JsonElement element = parse(jsonReader);
    60        if (!element.isJsonNull() && jsonReader.peek() != JsonToken.END_DOCUMENT) {
    61          throw new JsonSyntaxException("Did not consume the entire document.");
    62        }
    63        return element;
    64      } catch (MalformedJsonException e) {
    65        throw new JsonSyntaxException(e);
    66      } catch (IOException e) {
    67        throw new JsonIOException(e);
    68      } catch (NumberFormatException e) {
    69        throw new JsonSyntaxException(e);
    70      }
    71    }
    72  
    73    /**
    74     * Returns the next value from the JSON stream as a parse tree.
    75     *
    76     * @throws JsonParseException if there is an IOException or if the specified
    77     *     text is not valid JSON
    78     * @since 1.6
    79     */
    80    public JsonElement parse(JsonReader json) throws JsonIOException, JsonSyntaxException {
    81      boolean lenient = json.isLenient();
    82      json.setLenient(true);
    83      try {
    84        return Streams.parse(json);
    85      } catch (StackOverflowError e) {
    86        throw new JsonParseException("Failed parsing JSON source: " + json + " to Json", e);
    87      } catch (OutOfMemoryError e) {
    88        throw new JsonParseException("Failed parsing JSON source: " + json + " to Json", e);
    89      } finally {
    90        json.setLenient(lenient);
    91      }
    92    }
    93  }