| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.jclouds.json.internal; |
| |
| import java.io.IOException; |
| import java.io.Writer; |
| import java.lang.reflect.Field; |
| |
| import org.jclouds.json.gson.internal.bind.TypeAdapters; |
| |
| import com.google.common.base.Throwables; |
| import com.google.gson.TypeAdapter; |
| import com.google.gson.stream.JsonReader; |
| import com.google.gson.stream.JsonWriter; |
| |
| /** |
| * writes or reads the literal json directly |
| * |
| * @see <a href="http://code.google.com/p/google-gson/issues/detail?id=326" /> |
| */ |
| public abstract class NullHackJsonLiteralAdapter<L> extends TypeAdapter<L> { |
| |
| @Override |
| public L read(JsonReader reader) throws IOException { |
| return createJsonLiteralFromRawJson(TypeAdapters.JSON_ELEMENT.read(reader).toString()); |
| } |
| |
| |
| /** |
| * User supplied type that holds json literally. Ex. number as {@code 8}, boolean as {@code true} |
| * , string as {@code "value"}, object as {@code , list {@code []}. |
| */ |
| protected abstract L createJsonLiteralFromRawJson(String json); |
| |
| // the writer inside JsonWriter is not accessible currently |
| private static final Field outField; |
| static { |
| try { |
| outField = JsonWriter.class.getDeclaredField("out"); |
| } catch (SecurityException e) { |
| throw Throwables.propagate(e); |
| } catch (NoSuchFieldException e) { |
| throw Throwables.propagate(e); |
| } |
| outField.setAccessible(true); |
| } |
| |
| @Override |
| public void write(JsonWriter jsonWriter, L value) throws IOException { |
| |
| Writer writer = getWriter(jsonWriter); |
| boolean serializeNulls = jsonWriter.getSerializeNulls(); |
| try { |
| // we are using an implementation hack which depends on replacing null with the raw json |
| // supplied as a parameter. In this case, we must ensure we indeed serialize nulls. |
| NullReplacingWriter nullReplacingWriter = new NullReplacingWriter(writer, toString(value)); |
| setWriter(jsonWriter, nullReplacingWriter); |
| jsonWriter.setSerializeNulls(true); |
| jsonWriter.nullValue(); |
| } finally { |
| setWriter(jsonWriter, writer); |
| jsonWriter.setSerializeNulls(serializeNulls); |
| } |
| |
| } |
| |
| protected String toString(L value) { |
| return value.toString(); |
| } |
| |
| protected Writer getWriter(JsonWriter arg0) { |
| try { |
| return Writer.class.cast(outField.get(arg0)); |
| } catch (IllegalAccessException e) { |
| throw Throwables.propagate(e); |
| } |
| } |
| |
| private void setWriter(JsonWriter arg0, Writer arg1) { |
| try { |
| outField.set(arg0, arg1); |
| } catch (IllegalAccessException e) { |
| throw Throwables.propagate(e); |
| } |
| } |
| |
| public static final class NullReplacingWriter extends Writer { |
| private final Writer delegate; |
| private final String nullReplacement; |
| |
| public NullReplacingWriter(Writer delegate, String nullReplacement) { |
| this.delegate = delegate; |
| this.nullReplacement = nullReplacement; |
| } |
| |
| @Override |
| public void write(char[] buffer, int offset, int count) throws IOException { |
| delegate.write(buffer, offset, count); |
| } |
| |
| @Override |
| public void write(String s) throws IOException { |
| if (nullReplacement != null && s.equals("null")) { |
| s = nullReplacement; |
| } |
| super.write(s); |
| } |
| |
| @Override |
| public void flush() throws IOException { |
| delegate.flush(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| delegate.close(); |
| } |
| |
| } |
| } |