87 lines
2.8 KiB
Kotlin
87 lines
2.8 KiB
Kotlin
/*
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* Copyright 2017 Christian Basler
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package ch.dissem.bitmessage.entity
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import ch.dissem.bitmessage.exception.ApplicationException
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import ch.dissem.bitmessage.utils.AccessCounter
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import ch.dissem.bitmessage.utils.Decode.bytes
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import ch.dissem.bitmessage.utils.Decode.varString
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import ch.dissem.bitmessage.utils.Encode
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import java.io.ByteArrayOutputStream
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import java.io.InputStream
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import java.io.OutputStream
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import java.nio.ByteBuffer
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/**
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* @author Christian Basler
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*/
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open class CustomMessage(val customCommand: String, private val data: ByteArray? = null) : MessagePayload {
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override val command: MessagePayload.Command = MessagePayload.Command.CUSTOM
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val isError = COMMAND_ERROR == customCommand
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fun getData(): ByteArray {
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return data ?: {
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val out = ByteArrayOutputStream()
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writer().write(out)
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out.toByteArray()
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}.invoke()
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}
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override fun writer(): StreamableWriter = Writer(this)
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protected open class Writer(
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private val item: CustomMessage
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) : StreamableWriter {
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override fun write(out: OutputStream) {
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if (item.data != null) {
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Encode.varString(item.customCommand, out)
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out.write(item.data)
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} else {
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throw ApplicationException("Tried to write custom message without data. "
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+ "Programmer: did you forget to override #write()?")
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}
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}
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override fun write(buffer: ByteBuffer) {
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if (item.data != null) {
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Encode.varString(item.customCommand, buffer)
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buffer.put(item.data)
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} else {
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throw ApplicationException("Tried to write custom message without data. "
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+ "Programmer: did you forget to override #write()?")
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}
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}
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}
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companion object {
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val COMMAND_ERROR = "ERROR"
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@JvmStatic
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fun read(input: InputStream, length: Int): CustomMessage {
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val counter = AccessCounter()
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return CustomMessage(varString(input, counter), bytes(input, length - counter.length()))
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}
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@JvmStatic
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fun error(message: String) = CustomMessage(COMMAND_ERROR, message.toByteArray(charset("UTF-8")))
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}
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}
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