97 lines
2.7 KiB
Java
97 lines
2.7 KiB
Java
/*
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* Copyright 2015 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.utils.AccessCounter;
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import ch.dissem.bitmessage.utils.Encode;
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import java.io.*;
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import static ch.dissem.bitmessage.utils.Decode.bytes;
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import static ch.dissem.bitmessage.utils.Decode.varString;
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/**
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* @author Christian Basler
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*/
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public class CustomMessage implements MessagePayload {
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public static final String COMMAND_ERROR = "ERROR";
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private final String command;
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private final byte[] data;
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public CustomMessage(String command) {
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this.command = command;
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this.data = null;
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}
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public CustomMessage(String command, byte[] data) {
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this.command = command;
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this.data = data;
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}
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public static CustomMessage read(InputStream in, int length) throws IOException {
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AccessCounter counter = new AccessCounter();
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return new CustomMessage(varString(in, counter), bytes(in, length - counter.length()));
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}
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@Override
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public Command getCommand() {
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return Command.CUSTOM;
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}
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public String getCustomCommand() {
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return command;
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}
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public byte[] getData() {
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if (data != null) {
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return data;
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} else {
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try {
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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write(out);
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return out.toByteArray();
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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}
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@Override
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public void write(OutputStream out) throws IOException {
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if (data != null) {
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Encode.varString(command, out);
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out.write(data);
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} else {
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throw new RuntimeException("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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public boolean isError() {
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return COMMAND_ERROR.equals(command);
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}
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public static CustomMessage error(String message) {
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try {
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return new CustomMessage(COMMAND_ERROR, message.getBytes("UTF-8"));
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} catch (UnsupportedEncodingException e) {
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throw new RuntimeException(e);
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}
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}
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}
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