35 lines
851 B
Java
35 lines
851 B
Java
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package org.capnproto;
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import java.nio.ByteBuffer;
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public class SegmentBuilder extends SegmentReader {
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public int pos = 0; // in words
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public static final int FAILED_ALLOCATION = -1;
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public SegmentBuilder(ByteBuffer buf) {
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super(buf);
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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.reset();
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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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private final int currentSize() {
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return this.pos;
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}
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public final int allocate(int amount) {
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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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}
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