/** * Copyright (C) 2016 - 2030 youtongluan. * * 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 org.yx.common; import java.io.IOException; import java.nio.charset.StandardCharsets; import java.util.Base64; import org.yx.util.S; import com.google.gson.JsonSyntaxException; import com.google.gson.TypeAdapter; import com.google.gson.stream.JsonReader; import com.google.gson.stream.JsonToken; import com.google.gson.stream.JsonWriter; public class ByteArrayTypeAdapter extends TypeAdapter<byte[]> { private ByteArrayTypeAdapter() { } public static final ByteArrayTypeAdapter inst = new ByteArrayTypeAdapter(); @Override public void write(JsonWriter out, byte[] value) throws IOException { if (value == null) { out.nullValue(); return; } out.value(new String(Base64.getEncoder().encode(value), StandardCharsets.UTF_8)); } @Override public byte[] read(JsonReader in) throws IOException { JsonToken token = in.peek(); if (token == JsonToken.NULL) { in.nextNull(); return null; } if (token == JsonToken.STRING) { String s = in.nextString(); if (s.isEmpty()) { return new byte[0]; } return S.base64().decode(s.getBytes(StandardCharsets.UTF_8)); } if (token == JsonToken.BEGIN_ARRAY) { return rawRead(in); } throw new IOException(token + " is not valid byte array token"); } private byte[] rawRead(JsonReader in) throws IOException { @SuppressWarnings("resource") UnsafeByteArrayOutputStream out = new UnsafeByteArrayOutputStream(128); in.beginArray(); try { while (in.hasNext()) { if (in.peek() == JsonToken.NULL) { in.nextNull(); continue; } out.write(in.nextInt()); } } catch (NumberFormatException e) { throw new JsonSyntaxException(e); } in.endArray(); out.flush(); return out.toByteArray(); } }