XattrFiller.java

package co.paralleluniverse.fuse;

import java.nio.ByteBuffer;
import java.util.Arrays;

public final class XattrFiller {
    private final ByteBuffer buffer;
    private final long maxSize;
    private final int position;
    private byte[] value = null;
    private boolean isSet = false;

    XattrFiller(ByteBuffer buffer, long size, int position) {
        this.buffer = buffer;
        maxSize = size;
        this.position = position;
    }

    long getSize() {
        return value == null ? 0 : value.length;
    }

    public final void set(byte[] value) {
        if (buffer != null && value != null) {
            if (isSet)
                throw new IllegalStateException("Cannot set the xattr twice.");

            isSet = true;
            if (value.length > position + maxSize)
                value = Arrays.copyOf(value, position + (int) maxSize);

            buffer.put(value, position, value.length);
        }
        this.value = value;
    }
}