75 lines
2.5 KiB
Java
75 lines
2.5 KiB
Java
// Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
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// Licensed under the MIT License:
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package org.capnproto;
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import java.nio.ByteBuffer;
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public final class SegmentBuilder extends SegmentReader {
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public static final int FAILED_ALLOCATION = -1;
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public int pos = 0; // in words
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public int id = 0;
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public SegmentBuilder(ByteBuffer buf, Arena arena) {
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super(buf, arena);
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}
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// the total number of words the buffer can hold
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private final int capacity() {
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this.buffer.rewind();
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return this.buffer.remaining() / 8;
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}
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// return how many words have already been allocated
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public final int currentSize() {
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return this.pos;
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}
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/*
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Allocate `amount` words.
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*/
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public final int allocate(int amount) {
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assert amount >= 0 : "tried to allocate a negative number of words";
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if (amount > this.capacity() - this.currentSize()) {
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return FAILED_ALLOCATION; // no space left;
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} else {
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int result = this.pos;
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this.pos += amount;
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return result;
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}
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}
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public final BuilderArena getArena() {
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return (BuilderArena)this.arena;
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}
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public final boolean isWritable() {
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// TODO support external non-writable segments
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return true;
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}
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public final void put(int index, long value) {
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buffer.putLong(index * Constants.BYTES_PER_WORD, value);
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}
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}
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