144 lines
4.3 KiB
Java
144 lines
4.3 KiB
Java
/*
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* Copyright (c) 1999, 2001, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.imageio.stream;
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/**
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* A class representing a mutable reference to an array of bytes and
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* an offset and length within that array. <code>IIOByteBuffer</code>
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* is used by <code>ImageInputStream</code> to supply a sequence of bytes
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* to the caller, possibly with fewer copies than using the conventional
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* <code>read</code> methods that take a user-supplied byte array.
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*
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* <p> The byte array referenced by an <code>IIOByteBuffer</code> will
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* generally be part of an internal data structure belonging to an
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* <code>ImageReader</code> implementation; its contents should be
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* considered read-only and must not be modified.
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*
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*/
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public class IIOByteBuffer {
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private byte[] data;
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private int offset;
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private int length;
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/**
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* Constructs an <code>IIOByteBuffer</code> that references a
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* given byte array, offset, and length.
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*
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* @param data a byte array.
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* @param offset an int offset within the array.
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* @param length an int specifying the length of the data of
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* interest within byte array, in bytes.
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*/
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public IIOByteBuffer(byte[] data, int offset, int length) {
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this.data = data;
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this.offset = offset;
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this.length = length;
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}
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/**
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* Returns a reference to the byte array. The returned value should
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* be treated as read-only, and only the portion specified by the
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* values of <code>getOffset</code> and <code>getLength</code> should
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* be used.
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*
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* @return a byte array reference.
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*
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* @see #getOffset
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* @see #getLength
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* @see #setData
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*/
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public byte[] getData() {
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return data;
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}
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/**
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* Updates the array reference that will be returned by subsequent calls
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* to the <code>getData</code> method.
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*
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* @param data a byte array reference containing the new data value.
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*
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* @see #getData
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*/
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public void setData(byte[] data) {
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this.data = data;
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}
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/**
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* Returns the offset within the byte array returned by
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* <code>getData</code> at which the data of interest start.
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*
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* @return an int offset.
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*
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* @see #getData
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* @see #getLength
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* @see #setOffset
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*/
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public int getOffset() {
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return offset;
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}
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/**
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* Updates the value that will be returned by subsequent calls
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* to the <code>getOffset</code> method.
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*
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* @param offset an int containing the new offset value.
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*
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* @see #getOffset
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*/
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public void setOffset(int offset) {
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this.offset = offset;
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}
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/**
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* Returns the length of the data of interest within the byte
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* array returned by <code>getData</code>.
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*
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* @return an int length.
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*
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* @see #getData
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* @see #getOffset
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* @see #setLength
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*/
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public int getLength() {
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return length;
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}
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/**
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* Updates the value that will be returned by subsequent calls
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* to the <code>getLength</code> method.
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*
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* @param length an int containing the new length value.
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*
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* @see #getLength
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*/
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public void setLength(int length) {
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this.length = length;
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}
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}
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