9d62deeb6f
Motivation: We can use the diamond operator these days. Modification: Use diamond operator whenever possible. Result: More modern code and less boiler-plate.
118 lines
4.1 KiB
Java
118 lines
4.1 KiB
Java
/*
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* Copyright 2016 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.smtp;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.DecoderException;
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import io.netty.handler.codec.LineBasedFrameDecoder;
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import io.netty.util.CharsetUtil;
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import io.netty.util.internal.UnstableApi;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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/**
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* Decoder for SMTP responses.
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*/
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@UnstableApi
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public final class SmtpResponseDecoder extends LineBasedFrameDecoder {
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private List<CharSequence> details;
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/**
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* Creates a new instance that enforces the given {@code maxLineLength}.
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*/
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public SmtpResponseDecoder(int maxLineLength) {
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super(maxLineLength);
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}
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@Override
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protected SmtpResponse decode(ChannelHandlerContext ctx, ByteBuf buffer) throws Exception {
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ByteBuf frame = (ByteBuf) super.decode(ctx, buffer);
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if (frame == null) {
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// No full line received yet.
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return null;
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}
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try {
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final int readable = frame.readableBytes();
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final int readerIndex = frame.readerIndex();
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if (readable < 3) {
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throw newDecoderException(buffer, readerIndex, readable);
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}
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final int code = parseCode(frame);
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final int separator = frame.readByte();
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final CharSequence detail = frame.isReadable() ? frame.toString(CharsetUtil.US_ASCII) : null;
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List<CharSequence> details = this.details;
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switch (separator) {
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case ' ':
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// Marks the end of a response.
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this.details = null;
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if (details != null) {
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if (detail != null) {
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details.add(detail);
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}
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} else {
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if (detail == null) {
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details = Collections.emptyList();
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} else {
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details = Collections.singletonList(detail);
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}
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}
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return new DefaultSmtpResponse(code, details);
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case '-':
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// Multi-line response.
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if (detail != null) {
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if (details == null) {
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// Using initial capacity as it is very unlikely that we will receive a multi-line response
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// with more then 3 lines.
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this.details = details = new ArrayList<>(4);
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}
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details.add(detail);
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}
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break;
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default:
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throw newDecoderException(buffer, readerIndex, readable);
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}
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} finally {
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frame.release();
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}
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return null;
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}
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private static DecoderException newDecoderException(ByteBuf buffer, int readerIndex, int readable) {
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return new DecoderException(
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"Received invalid line: '" + buffer.toString(readerIndex, readable, CharsetUtil.US_ASCII) + '\'');
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}
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/**
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* Parses the io.netty.handler.codec.smtp code without any allocation, which is three digits.
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*/
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private static int parseCode(ByteBuf buffer) {
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final int first = parseNumber(buffer.readByte()) * 100;
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final int second = parseNumber(buffer.readByte()) * 10;
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final int third = parseNumber(buffer.readByte());
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return first + second + third;
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}
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private static int parseNumber(byte b) {
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return Character.digit((char) b, 10);
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}
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}
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