Java tutorial
/* * Copyright 2016 The Netty Project * * The Netty Project 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 io.netty.handler.codec.http2; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.util.IllegalReferenceCountException; import io.netty.util.internal.StringUtil; import io.netty.util.internal.UnstableApi; import static io.netty.handler.codec.http2.Http2CodecUtil.verifyPadding; import static io.netty.util.internal.ObjectUtil.checkNotNull; /** * The default {@link Http2DataFrame} implementation. */ @UnstableApi public final class DefaultHttp2DataFrame extends AbstractHttp2StreamFrame implements Http2DataFrame { private final ByteBuf content; private final boolean endStream; private final int padding; private final int initialFlowControlledBytes; /** * Equivalent to {@code new DefaultHttp2DataFrame(content, false)}. * * @param content non-{@code null} payload */ public DefaultHttp2DataFrame(ByteBuf content) { this(content, false); } /** * Equivalent to {@code new DefaultHttp2DataFrame(Unpooled.EMPTY_BUFFER, endStream)}. * * @param endStream whether this data should terminate the stream */ public DefaultHttp2DataFrame(boolean endStream) { this(Unpooled.EMPTY_BUFFER, endStream); } /** * Equivalent to {@code new DefaultHttp2DataFrame(content, endStream, 0)}. * * @param content non-{@code null} payload * @param endStream whether this data should terminate the stream */ public DefaultHttp2DataFrame(ByteBuf content, boolean endStream) { this(content, endStream, 0); } /** * Construct a new data message. * * @param content non-{@code null} payload * @param endStream whether this data should terminate the stream * @param padding additional bytes that should be added to obscure the true content size. Must be between 0 and * 256 (inclusive). */ public DefaultHttp2DataFrame(ByteBuf content, boolean endStream, int padding) { this.content = checkNotNull(content, "content"); this.endStream = endStream; verifyPadding(padding); this.padding = padding; if (content().readableBytes() + (long) padding > Integer.MAX_VALUE) { throw new IllegalArgumentException("content + padding must be <= Integer.MAX_VALUE"); } initialFlowControlledBytes = content().readableBytes() + padding; } @Override public DefaultHttp2DataFrame stream(Http2FrameStream stream) { super.stream(stream); return this; } @Override public String name() { return "DATA"; } @Override public boolean isEndStream() { return endStream; } @Override public int padding() { return padding; } @Override public ByteBuf content() { if (content.refCnt() <= 0) { throw new IllegalReferenceCountException(content.refCnt()); } return content; } @Override public int initialFlowControlledBytes() { return initialFlowControlledBytes; } @Override public DefaultHttp2DataFrame copy() { return replace(content().copy()); } @Override public DefaultHttp2DataFrame duplicate() { return replace(content().duplicate()); } @Override public DefaultHttp2DataFrame retainedDuplicate() { return replace(content().retainedDuplicate()); } @Override public DefaultHttp2DataFrame replace(ByteBuf content) { return new DefaultHttp2DataFrame(content, endStream, padding); } @Override public int refCnt() { return content.refCnt(); } @Override public boolean release() { return content.release(); } @Override public boolean release(int decrement) { return content.release(decrement); } @Override public DefaultHttp2DataFrame retain() { content.retain(); return this; } @Override public DefaultHttp2DataFrame retain(int increment) { content.retain(increment); return this; } @Override public String toString() { return StringUtil.simpleClassName(this) + "(stream=" + stream() + ", content=" + content + ", endStream=" + endStream + ", padding=" + padding + ')'; } @Override public DefaultHttp2DataFrame touch() { content.touch(); return this; } @Override public DefaultHttp2DataFrame touch(Object hint) { content.touch(hint); return this; } @Override public boolean equals(Object o) { if (!(o instanceof DefaultHttp2DataFrame)) { return false; } DefaultHttp2DataFrame other = (DefaultHttp2DataFrame) o; return super.equals(other) && content.equals(other.content()) && endStream == other.endStream && padding == other.padding; } @Override public int hashCode() { int hash = super.hashCode(); hash = hash * 31 + content.hashCode(); hash = hash * 31 + (endStream ? 0 : 1); hash = hash * 31 + padding; return hash; } }