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