Android Open Source - reflect-app Json Stream Parser






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Back to project page reflect-app.

License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright (C) 2009 Google Inc.//w w w.  j a v  a2s .  c  o  m
 *
 * 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.EOFException;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.Iterator;
import java.util.NoSuchElementException;

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 streaming parser that allows reading of multiple {@link JsonElement}s from the specified reader
 * asynchronously.
 * 
 * <p>This class is conditionally thread-safe (see Item 70, Effective Java second edition). To
 * properly use this class across multiple threads, you will need to add some external
 * synchronization.  For example:
 * 
 * <pre>
 * JsonStreamParser parser = new JsonStreamParser("['first'] {'second':10} 'third'");
 * JsonElement element;
 * synchronized (parser) {  // synchronize on an object shared by threads
 *   if (parser.hasNext()) {
 *     element = parser.next();
 *   }
 * }
 * </pre>
 *
 * @author Inderjeet Singh
 * @author Joel Leitch
 * @since 1.4
 */
public final class JsonStreamParser implements Iterator<JsonElement> {
  private final JsonReader parser;
  private final Object lock;

  /**
   * @param json The string containing JSON elements concatenated to each other.
   * @since 1.4
   */
  public JsonStreamParser(String json) {
    this(new StringReader(json));      
  }
  
  /**
   * @param reader The data stream containing JSON elements concatenated to each other.
   * @since 1.4
   */
  public JsonStreamParser(Reader reader) {
    parser = new JsonReader(reader);
    parser.setLenient(true);
    lock = new Object();
  }
  
  /**
   * Returns the next available {@link JsonElement} on the reader. Null if none available.
   * 
   * @return the next available {@link JsonElement} on the reader. Null if none available.
   * @throws JsonParseException if the incoming stream is malformed JSON.
   * @since 1.4
   */
  public JsonElement next() throws JsonParseException {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    
    try {
      return Streams.parse(parser);
    } catch (StackOverflowError e) {
      throw new JsonParseException("Failed parsing JSON source to Json", e);
    } catch (OutOfMemoryError e) {
      throw new JsonParseException("Failed parsing JSON source to Json", e);
    } catch (JsonParseException e) {
      throw e.getCause() instanceof EOFException ? new NoSuchElementException() : e;
    }
  }

  /**
   * Returns true if a {@link JsonElement} is available on the input for consumption
   * @return true if a {@link JsonElement} is available on the input, false otherwise
   * @since 1.4
   */
  public boolean hasNext() {
    synchronized (lock) {
      try {
        return parser.peek() != JsonToken.END_DOCUMENT;
      } catch (MalformedJsonException e) {
        throw new JsonSyntaxException(e);
      } catch (IOException e) {
        throw new JsonIOException(e);
      }
    }
  }

  /**
   * This optional {@link Iterator} method is not relevant for stream parsing and hence is not
   * implemented.
   * @since 1.4
   */
  public void remove() {
    throw new UnsupportedOperationException();
  }
}




Java Source Code List

com.google.gson.DefaultDateTypeAdapter.java
com.google.gson.ExclusionStrategy.java
com.google.gson.FieldAttributes.java
com.google.gson.FieldNamingPolicy.java
com.google.gson.FieldNamingStrategy.java
com.google.gson.GsonBuilder.java
com.google.gson.Gson.java
com.google.gson.InstanceCreator.java
com.google.gson.JsonArray.java
com.google.gson.JsonDeserializationContext.java
com.google.gson.JsonDeserializer.java
com.google.gson.JsonElement.java
com.google.gson.JsonIOException.java
com.google.gson.JsonNull.java
com.google.gson.JsonObject.java
com.google.gson.JsonParseException.java
com.google.gson.JsonParser.java
com.google.gson.JsonPrimitive.java
com.google.gson.JsonSerializationContext.java
com.google.gson.JsonSerializer.java
com.google.gson.JsonStreamParser.java
com.google.gson.JsonSyntaxException.java
com.google.gson.LongSerializationPolicy.java
com.google.gson.TreeTypeAdapter.java
com.google.gson.TypeAdapterFactory.java
com.google.gson.TypeAdapter.java
com.google.gson.annotations.Expose.java
com.google.gson.annotations.SerializedName.java
com.google.gson.annotations.Since.java
com.google.gson.annotations.Until.java
com.google.gson.annotations.package-info.java
com.google.gson.internal.ConstructorConstructor.java
com.google.gson.internal.Excluder.java
com.google.gson.internal.JsonReaderInternalAccess.java
com.google.gson.internal.LazilyParsedNumber.java
com.google.gson.internal.LinkedHashTreeMap.java
com.google.gson.internal.ObjectConstructor.java
com.google.gson.internal.Primitives.java
com.google.gson.internal.Streams.java
com.google.gson.internal.UnsafeAllocator.java
com.google.gson.internal.$Gson$Preconditions.java
com.google.gson.internal.$Gson$Types.java
com.google.gson.internal.bind.ArrayTypeAdapter.java
com.google.gson.internal.bind.CollectionTypeAdapterFactory.java
com.google.gson.internal.bind.DateTypeAdapter.java
com.google.gson.internal.bind.JsonTreeReader.java
com.google.gson.internal.bind.JsonTreeWriter.java
com.google.gson.internal.bind.MapTypeAdapterFactory.java
com.google.gson.internal.bind.ObjectTypeAdapter.java
com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.java
com.google.gson.internal.bind.SqlDateTypeAdapter.java
com.google.gson.internal.bind.TimeTypeAdapter.java
com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.java
com.google.gson.internal.bind.TypeAdapters.java
com.google.gson.internal.package-info.java
com.google.gson.reflect.TypeToken.java
com.google.gson.reflect.package-info.java
com.google.gson.stream.JsonReader.java
com.google.gson.stream.JsonScope.java
com.google.gson.stream.JsonToken.java
com.google.gson.stream.JsonWriter.java
com.google.gson.stream.MalformedJsonException.java
com.google.gson.package-info.java
com.pontydysgu.data.Answer.java
com.pontydysgu.data.LoginData.java
com.pontydysgu.data.QuestionStack.java
com.pontydysgu.data.Question.java
com.pontydysgu.data.StackArray.java
com.pontydysgu.gui.StackArrayAdapter.java
com.pontydysgu.pontylearningapp.DataService.java
com.pontydysgu.pontylearningapp.Login.java
com.pontydysgu.pontylearningapp.QuestionCycle.java
com.pontydysgu.pontylearningapp.Stackoverview.java
com.pontydysgu.webio.GetWebRequest.java
com.pontydysgu.webio.LoginService.java
com.pontydysgu.webio.PontyService.java
com.pontydysgu.webio.RetrieveStacksCallback.java
com.pontydysgu.webio.RetrieveStacksTask.java
com.pontydysgu.webio.SubmitAnswerCallback.java
com.pontydysgu.webio.SubmitAnswerTask.java