a33200ca38
Motivation: We have a utility method to check for > 0 and >0 arguments. We should use it. Modification: use checkPositive/checkPositiveOrZero instead of if statement. Result: Re-use utility method.
73 lines
2.3 KiB
Java
73 lines
2.3 KiB
Java
/*
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* Copyright 2013 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.channel;
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import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.ByteBufHolder;
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/**
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* Default {@link MessageSizeEstimator} implementation which supports the estimation of the size of
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* {@link ByteBuf}, {@link ByteBufHolder} and {@link FileRegion}.
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*/
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public final class DefaultMessageSizeEstimator implements MessageSizeEstimator {
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private static final class HandleImpl implements Handle {
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private final int unknownSize;
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private HandleImpl(int unknownSize) {
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this.unknownSize = unknownSize;
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}
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@Override
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public int size(Object msg) {
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if (msg instanceof ByteBuf) {
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return ((ByteBuf) msg).readableBytes();
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}
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if (msg instanceof ByteBufHolder) {
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return ((ByteBufHolder) msg).content().readableBytes();
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}
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if (msg instanceof FileRegion) {
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return 0;
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}
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return unknownSize;
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}
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}
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/**
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* Return the default implementation which returns {@code 8} for unknown messages.
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*/
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public static final MessageSizeEstimator DEFAULT = new DefaultMessageSizeEstimator(8);
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private final Handle handle;
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/**
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* Create a new instance
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*
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* @param unknownSize The size which is returned for unknown messages.
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*/
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public DefaultMessageSizeEstimator(int unknownSize) {
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checkPositiveOrZero(unknownSize, "unknownSize");
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handle = new HandleImpl(unknownSize);
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}
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@Override
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public Handle newHandle() {
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return handle;
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}
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}
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