| /* |
| * Copyright (C) 2010 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.internal; |
| |
| import com.google.gson.JsonElement; |
| import com.google.gson.JsonIOException; |
| import com.google.gson.JsonNull; |
| import com.google.gson.JsonParseException; |
| import com.google.gson.JsonSyntaxException; |
| import com.google.gson.internal.bind.TypeAdapters; |
| import com.google.gson.stream.JsonReader; |
| import com.google.gson.stream.JsonWriter; |
| import com.google.gson.stream.MalformedJsonException; |
| import java.io.EOFException; |
| import java.io.IOException; |
| import java.io.Writer; |
| |
| import org.jclouds.json.internal.JsonLiteral; |
| |
| /** |
| * Reads and writes GSON parse trees over streams. |
| */ |
| public final class Streams { |
| /** |
| * Takes a reader in any state and returns the next value as a JsonElement. |
| */ |
| public static JsonElement parse(JsonReader reader) throws JsonParseException { |
| boolean isEmpty = true; |
| try { |
| reader.peek(); |
| isEmpty = false; |
| return TypeAdapters.JSON_ELEMENT.read(reader); |
| } catch (EOFException e) { |
| /* |
| * For compatibility with JSON 1.5 and earlier, we return a JsonNull for |
| * empty documents instead of throwing. |
| */ |
| if (isEmpty) { |
| return JsonNull.INSTANCE; |
| } |
| throw new JsonIOException(e); |
| } catch (MalformedJsonException e) { |
| throw new JsonSyntaxException(e); |
| } catch (IOException e) { |
| throw new JsonIOException(e); |
| } catch (NumberFormatException e) { |
| throw new JsonSyntaxException(e); |
| } |
| } |
| |
| /** |
| * Writes the JSON element to the writer, recursively. |
| */ |
| public static void write(JsonElement element, JsonWriter writer) throws IOException { |
| //BEGIN JCLOUDS PATCH |
| // * @see <a href="http://code.google.com/p/google-gson/issues/detail?id=326"/> |
| if (element instanceof JsonLiteral ) { |
| writer.value(JsonLiteral.class.cast(element)); |
| //END JCLOUDS PATCH |
| } else { |
| TypeAdapters.JSON_ELEMENT.write(writer, element); |
| } |
| } |
| |
| public static Writer writerForAppendable(Appendable appendable) { |
| return appendable instanceof Writer ? (Writer) appendable : new AppendableWriter(appendable); |
| } |
| |
| /** |
| * Adapts an {@link Appendable} so it can be passed anywhere a {@link Writer} |
| * is used. |
| */ |
| private static class AppendableWriter extends Writer { |
| private final Appendable appendable; |
| private final CurrentWrite currentWrite = new CurrentWrite(); |
| |
| private AppendableWriter(Appendable appendable) { |
| this.appendable = appendable; |
| } |
| |
| @Override public void write(char[] chars, int offset, int length) throws IOException { |
| currentWrite.chars = chars; |
| appendable.append(currentWrite, offset, offset + length); |
| } |
| |
| @Override public void write(int i) throws IOException { |
| appendable.append((char) i); |
| } |
| |
| @Override public void flush() {} |
| @Override public void close() {} |
| |
| /** |
| * A mutable char sequence pointing at a single char[]. |
| */ |
| static class CurrentWrite implements CharSequence { |
| char[] chars; |
| public int length() { |
| return chars.length; |
| } |
| public char charAt(int i) { |
| return chars[i]; |
| } |
| public CharSequence subSequence(int start, int end) { |
| return new String(chars, start, end - start); |
| } |
| } |
| } |
| |
| } |