FileDocCategorySizeDatePackage
InputStorage.javaAPI DocJ2ME MIDP 2.02382Thu Nov 07 12:02:26 GMT 2002com.sun.midp.publickeystore

InputStorage

public class InputStorage extends Storage
Retieves stored fields from an InputStream. Since Java Microedition has no serialization, this is a simple substitute.

Fields Summary
private DataInputStream
in
stream to read from
Constructors Summary
InputStorage(InputStream input)
Constructs an InputStorage for an InputStream.

param
input the input storage input stream.
exception
IOException if the storage version cannot be read

        in = new DataInputStream(input);

        // skip past the version number.
        in.readByte();
Methods Summary
java.lang.ObjectreadValue(byte[] tag)
Reads a field that was stored as tag, type, value set.

param
tag byte array of one byte to hold the tag of the field that was read
return
value of field that was stored, or null if there are no more fields
exception
IOException if the input storage was corrupted

        byte type;

        try {
            try {
                in.readFully(tag, 0, 1);
            } catch (EOFException eofe) {
                // this just means there are no more fields in storage
                return null;
            }

            type = in.readByte();
            if (type == BINARY_TYPE) {
                int len;
                byte[] value;

                /*
                 * must read the length first, because DataOutputStream does
                 * not handle handle byte arrays.
                 */
                len = in.readUnsignedShort();
                if (len < 0) {
                    throw new IOException();
                }

                value = new byte[len];
                in.readFully(value);
                return value;
            }

            if (type == STRING_TYPE) {
                return in.readUTF();
            }

            if (type == LONG_TYPE) {
                return new Long(in.readLong());
            }

            throw new IOException();
        } catch (IOException e) {
            throw new IOException("input storage corrupted");
        }