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/// <summary>**************************************************************************
/// 
/// $Id: ComponentMappingBox.java,v 1.1 2002/07/25 14:50:46 grosbois Exp $
/// 
/// Copyright Eastman Kodak Company, 343 State Street, Rochester, NY 14650
/// $Date $
/// ***************************************************************************
/// </summary>
using System;
using ColorSpaceException = CSJ2K.Color.ColorSpaceException;
using ICCProfile = CSJ2K.Icc.ICCProfile;
using ParameterList = CSJ2K.j2k.util.ParameterList;
using RandomAccessIO = CSJ2K.j2k.io.RandomAccessIO;
namespace CSJ2K.Color.Boxes
{
        
        /// <summary> This class maps the components in the codestream
        /// to channels in the image.  It models the Component
        /// Mapping box in the JP2 header.
        /// 
        /// </summary>
        /// <version>   1.0
        /// </version>
        /// <author>    Bruce A. Kern
        /// </author>
        public sealed class ComponentMappingBox:JP2Box
        {
                public int NChannels
                {
                        /* Return the number of mapped channels. */
                        
                        get
                        {
                                return nChannels;
                        }
                        
                }
                
                private int nChannels;
                private System.Collections.ArrayList map = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
                
                /// <summary> Construct a ComponentMappingBox from an input image.</summary>
                /// <param name="in">RandomAccessIO jp2 image
                /// </param>
                /// <param name="boxStart">offset to the start of the box in the image
                /// </param>
                /// <exception cref="IOException,">ColorSpaceException 
                /// </exception>
                public ComponentMappingBox(RandomAccessIO in_Renamed, int boxStart):base(in_Renamed, boxStart)
                {
                        readBox();
                }
                
                /// <summary>Analyze the box content. </summary>
                internal void  readBox()
                {
                        nChannels = (boxEnd - dataStart) / 4;
                        in_Renamed.seek(dataStart);
                        for (int offset = dataStart; offset < boxEnd; offset += 4)
                        {
                                byte[] mapping = new byte[4];
                                in_Renamed.readFully(mapping, 0, 4);
                                map.Add(mapping);
                        }
                }
                
                /* Return the component mapped to the channel. */
                public int getCMP(int channel)
                {
                        byte[] mapping = (byte[]) map[channel];
                        return ICCProfile.getShort(mapping, 0) & 0x0000ffff;
                }
                
                /// <summary>Return the channel type. </summary>
                public short getMTYP(int channel)
                {
                        byte[] mapping = (byte[]) map[channel];
                        return (short) (mapping[2] & 0x00ff);
                }
                
                /// <summary>Return the palette index for the channel. </summary>
                public short getPCOL(int channel)
                {
                        byte[] mapping = (byte[]) map[channel];
                        return (short) (mapping[3] & 0x000ff);
                }
                
                /// <summary>Return a suitable String representation of the class instance. </summary>
                public override System.String ToString()
                {
                        System.Text.StringBuilder rep = new System.Text.StringBuilder("[ComponentMappingBox ").Append("  ");
                        rep.Append("nChannels= ").Append(System.Convert.ToString(nChannels));
                        System.Collections.IEnumerator Enum = map.GetEnumerator();
                        //UPGRADE_TODO: Method 'java.util.Enumeration.hasMoreElements' was converted to 'System.Collections.IEnumerator.MoveNext' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javautilEnumerationhasMoreElements'"
                        while (Enum.MoveNext())
                        {
                                //UPGRADE_TODO: Method 'java.util.Enumeration.nextElement' was converted to 'System.Collections.IEnumerator.Current' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javautilEnumerationnextElement'"
                                byte[] bfr = (byte[]) Enum.Current;
                                rep.Append(eol).Append("  ").Append("CMP= ").Append(System.Convert.ToString(getCMP(bfr))).Append(", ");
                                rep.Append("MTYP= ").Append(System.Convert.ToString(getMTYP(bfr))).Append(", ");
                                rep.Append("PCOL= ").Append(System.Convert.ToString(getPCOL(bfr)));
                        }
                        rep.Append("]");
                        return rep.ToString();
                }
                
                private int getCMP(byte[] mapping)
                {
                        return ICCProfile.getShort(mapping, 0) & 0x0000ffff;
                }
                
                private short getMTYP(byte[] mapping)
                {
                        return (short) (mapping[2] & 0x00ff);
                }
                
                private short getPCOL(byte[] mapping)
                {
                        return (short) (mapping[3] & 0x000ff);
                }
                
                /* end class ComponentMappingBox */
                static ComponentMappingBox()
                {
                        {
                                type = 0x636d6170;
                        }
                }
        }
}

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