Package com.tangosol.io

Class WrapperDataInputStream

java.lang.Object
java.io.InputStream
com.tangosol.io.WrapperDataInputStream
All Implemented Interfaces:
com.oracle.coherence.common.io.InputStreaming, InputStreaming, Closeable, DataInput, AutoCloseable
Direct Known Subclasses:
WrapperBufferInput, WrapperObjectInputStream
public class WrapperDataInputStream extends InputStream implements DataInput, InputStreaming
This is an imitation DataInputStream class that provides the DataInput interface by delegating to an object that implements the DataInput interface. Primarily, this is intended as a base class for building specific-purpose DataInput wrappers.
Author:
cp 2004.09.09

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected DataInput
    m_in
    The underlying DataInput object to use.
    protected ClassLoader
    m_loader
    The class loader used to resolve deserialized classes.

  • Constructor Summary

    Constructors
    Constructor
    Description
    WrapperDataInputStream(DataInput in)
    Construct a WrapperDataInputStream that will read from the specified object implementing the DataInput interface.
    WrapperDataInputStream(DataInput in, ClassLoader loader)
    Construct a WrapperDataInputStream that will read from the specified object implementing the DataInput interface.

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    available()
    Returns the number of bytes that can be read (or skipped over) from this input stream without causing a blocking I/O condition to occur.
    void
    close()
    Close the InputStream and release any system resources associated with it.
    ClassLoader
    getClassLoader()
    Returns a ClassLoader associated with this stream.
    DataInput
    getDataInput()
    Obtain the underlying object providing the DataInput interface that this object is delegating to.
    void
    mark(int cbReadLimit)
    Marks the current read position in the InputStream in order to support the stream to be later "rewound" (using the reset() method) to the current position.
    boolean
    markSupported()
    Determine if this InputStream supports the mark(int) and reset() methods.
    int
    read()
    Read the next byte of data from the InputStream.
    int
    read(byte[] ab)
    Read some number of bytes from the input stream and store them into the passed array ab.
    int
    read(byte[] ab, int of, int cb)
    Read up to cb bytes from the input stream and store them into the passed array ab starting at offset of.
    boolean
    readBoolean()
    Read a boolean value.
    byte
    readByte()
    Read a byte value.
    char
    readChar()
    Read a char value.
    double
    readDouble()
    Read a double value.
    float
    readFloat()
    Read a float value.
    void
    readFully(byte[] ab)
    Read ab.length bytes and store them in ab.
    void
    readFully(byte[] ab, int of, int cb)
    Read cb bytes and store them in ab starting at offset of.
    int
    readInt()
    Read an int value.
    String
    readLine()
    Reads the next "line" of text.
    long
    readLong()
    Read a long value.
    short
    readShort()
    Read a short value.
    int
    readUnsignedByte()
    Read an unsigned byte value.
    int
    readUnsignedShort()
    Read an unsigned short value.
    String
    readUTF()
    Reads a String value.
    void
    reset()
    Rewind this stream to the position at the time the mark(int) method was last called on this InputStream.
    void
    setClassLoader(ClassLoader loader)
    Set the ClassLoader associated with this stream.
    long
    skip(long cb)
    Skips over up to the specified number of bytes of data from this InputStream.
    int
    skipBytes(int cb)
    Skips over up to the specified number of bytes of data.

    Methods inherited from class java.io.InputStream

    nullInputStream, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • m_in

      protected DataInput m_in
      The underlying DataInput object to use.

    • m_loader

      protected ClassLoader m_loader
      The class loader used to resolve deserialized classes.

  • Constructor Details

    • WrapperDataInputStream

      public WrapperDataInputStream(DataInput in)
      Construct a WrapperDataInputStream that will read from the specified object implementing the DataInput interface.
      Parameters:
      in - an object implementing DataInput to read from

    • WrapperDataInputStream

      public WrapperDataInputStream(DataInput in, ClassLoader loader)
      Construct a WrapperDataInputStream that will read from the specified object implementing the DataInput interface.
      Parameters:
      in - an object implementing DataInput to read from
      loader - the ClassLoader associated with this stream

  • Method Details

    • getDataInput

      public DataInput getDataInput()
      Obtain the underlying object providing the DataInput interface that this object is delegating to.
      Returns:
      the underlying DataInput

    • getClassLoader

      public ClassLoader getClassLoader()
      Returns a ClassLoader associated with this stream.
      Returns:
      a ClassLoader associated with this stream

    • setClassLoader

      public void setClassLoader(ClassLoader loader)
      Set the ClassLoader associated with this stream.
      Parameters:
      loader - the ClassLoader associated with this stream

    • readFully

      public void readFully(byte[] ab) throws IOException
      Read ab.length bytes and store them in ab.

      This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

      Specified by:
      readFully in interface DataInput
      Parameters:
      ab - the array to store the bytes which are read from the stream
      Throws:
      NullPointerException - if the passed array is null
      EOFException - if the stream is exhausted before the number of bytes indicated by the array length could be read
      IOException - if an I/O error occurs

    • readFully

      public void readFully(byte[] ab, int of, int cb) throws IOException
      Read cb bytes and store them in ab starting at offset of.

      This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

      Specified by:
      readFully in interface DataInput
      Parameters:
      ab - the array to store the bytes which are read from the stream
      of - the offset into the array that the read bytes will be stored
      cb - the maximum number of bytes to read
      Throws:
      NullPointerException - if the passed array is null
      IndexOutOfBoundsException - if of or cb is negative, or of+cb is greater than the length of the ab
      EOFException - if the stream is exhausted before the number of bytes indicated by the array length could be read
      IOException - if an I/O error occurs

    • skipBytes

      public int skipBytes(int cb) throws IOException
      Skips over up to the specified number of bytes of data. The number of bytes actually skipped over may be fewer than the number specified to skip, and may even be zero; this can be caused by an end-of-file condition, but can also occur even when there is data remaining to be read. As a result, the caller should check the return value from this method, which indicates the actual number of bytes skipped.
      Specified by:
      skipBytes in interface DataInput
      Parameters:
      cb - the maximum number of bytes to skip over
      Returns:
      the actual number of bytes that were skipped over
      Throws:
      IOException - if an I/O error occurs

    • readBoolean

      public boolean readBoolean() throws IOException
      Read a boolean value.

      This method is the counterpart for the DataOutput.writeBoolean(boolean) method.

      Specified by:
      readBoolean in interface DataInput
      Returns:
      either true or false
      Throws:
      EOFException - if the value could not be read because no more data remains to be read
      IOException - if an I/O error occurs

    • readByte

      public byte readByte() throws IOException
      Read a byte value.

      This method is the counterpart for the DataOutput.writeByte(int) method.

      Specified by:
      readByte in interface DataInput
      Returns:
      a byte value
      Throws:
      EOFException - if the value could not be read because no more data remains to be read
      IOException - if an I/O error occurs

    • readUnsignedByte

      public int readUnsignedByte() throws IOException
      Read an unsigned byte value.

      This method is the counterpart for the DataOutput.writeByte(int) method when it is used with unsigned 8-bit values.

      Specified by:
      readUnsignedByte in interface DataInput
      Returns:
      an int value in the range 0x00 to 0xFF
      Throws:
      EOFException - if the value could not be read because no more data remains to be read
      IOException - if an I/O error occurs

    • readShort

      public short readShort() throws IOException
      Read a short value.

      This method is the counterpart for the DataOutput.writeShort(int) method.

      Specified by:
      readShort in interface DataInput
      Returns:
      a short value
      Throws:
      EOFException - if the value could not be read because no more data remains to be read
      IOException - if an I/O error occurs

    • readUnsignedShort

      public int readUnsignedShort() throws IOException
      Read an unsigned short value.

      This method is the counterpart for the DataOutput.writeShort(int) method when it is used with unsigned 16-bit values.

      Specified by:
      readUnsignedShort in interface DataInput
      Returns:
      an int value in the range of 0x0000 to 0xFFFF
      Throws:
      EOFException - if the value could not be read because no more data remains to be read
      IOException - if an I/O error occurs

    • readChar

      public char readChar() throws IOException
      Read a char value.

      This method is the counterpart for the DataOutput.writeChar(int) method.

      Specified by:
      readChar in interface DataInput
      Returns:
      a char value
      Throws:
      EOFException - if the value could not be read because no more data remains to be read
      IOException - if an I/O error occurs

    • readInt

      public int readInt() throws IOException
      Read an int value.

      This method is the counterpart for the DataOutput.writeInt(int) method.

      Specified by:
      readInt in interface DataInput
      Returns:
      an int value
      Throws:
      EOFException - if the value could not be read because no more data remains to be read
      IOException - if an I/O error occurs

    • readLong

      public long readLong() throws IOException
      Read a long value.

      This method is the counterpart for the DataOutput.writeLong(long) method.

      Specified by:
      readLong in interface DataInput
      Returns:
      a long value
      Throws:
      EOFException - if the value could not be read because no more data remains to be read
      IOException - if an I/O error occurs

    • readFloat

      public float readFloat() throws IOException
      Read a float value.

      This method is the counterpart for the DataOutput.writeFloat(float) method.

      Specified by:
      readFloat in interface DataInput
      Returns:
      a float value
      Throws:
      EOFException - if the value could not be read because no more data remains to be read
      IOException - if an I/O error occurs

    • readDouble

      public double readDouble() throws IOException
      Read a double value.

      This method is the counterpart for the DataOutput.writeDouble(double) method.

      Specified by:
      readDouble in interface DataInput
      Returns:
      a double value
      Throws:
      EOFException - if the value could not be read because no more data remains to be read
      IOException - if an I/O error occurs

    • readLine

      public String readLine() throws IOException
      Reads the next "line" of text.

      This method does not have a counterpart in the DataOutput interface. Furthermore, this method is defined as operating on bytes and not on characters, and thus it should be selected for use only after careful consideration, as if it were deprecated.

      Specified by:
      readLine in interface DataInput
      Returns:
      a line of text as a String
      Throws:
      IOException - if an I/O error occurs.

    • readUTF

      public String readUTF() throws IOException
      Reads a String value.

      This method is the counterpart for the DataOutput.writeUTF(java.lang.String) method.

      Specified by:
      readUTF in interface DataInput
      Returns:
      a String value
      Throws:
      UTFDataFormatException - if the bytes that were read were not a valid UTF-8 encoded string
      EOFException - if the value could not be read because no more data remains to be read
      IOException - if an I/O error occurs

    • read

      public int read() throws IOException
      Read the next byte of data from the InputStream. The value byte is returned as an int in the range 0 to 255. If the end of the stream has been reached, the value -1 is returned.

      This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

      Specified by:
      read in interface com.oracle.coherence.common.io.InputStreaming
      Specified by:
      read in class InputStream
      Returns:
      the next byte of data, or -1 if the end of the stream has been reached
      Throws:
      IOException - if an I/O error occurs

    • read

      public int read(byte[] ab) throws IOException
      Read some number of bytes from the input stream and store them into the passed array ab. The number of bytes actually read is returned.

      This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

      Specified by:
      read in interface com.oracle.coherence.common.io.InputStreaming
      Overrides:
      read in class InputStream
      Parameters:
      ab - the array to store the bytes which are read from the stream
      Returns:
      the number of bytes read from the stream, or -1 if no bytes were read from the stream because the end of the stream had been reached
      Throws:
      NullPointerException - if the passed array is null
      IOException - if an I/O error occurs

    • read

      public int read(byte[] ab, int of, int cb) throws IOException
      Read up to cb bytes from the input stream and store them into the passed array ab starting at offset of. The number of bytes actually read is returned.

      This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

      Specified by:
      read in interface com.oracle.coherence.common.io.InputStreaming
      Overrides:
      read in class InputStream
      Parameters:
      ab - the array to store the bytes which are read from the stream
      of - the offset into the array that the read bytes will be stored
      cb - the maximum number of bytes to read
      Returns:
      the number of bytes read from the stream, or -1 if no bytes were read from the stream because the end of the stream had been reached
      Throws:
      NullPointerException - if the passed array is null
      IndexOutOfBoundsException - if of or cb is negative, or of+cb is greater than the length of the ab
      IOException - if an I/O error occurs

    • skip

      public long skip(long cb) throws IOException
      Skips over up to the specified number of bytes of data from this InputStream. The number of bytes actually skipped over may be fewer than the number specified to skip, and may even be zero; this can be caused by an end-of-file condition, but can also occur even when there is data remaining in the InputStream. As a result, the caller should check the return value from this method, which indicates the actual number of bytes skipped.
      Specified by:
      skip in interface com.oracle.coherence.common.io.InputStreaming
      Overrides:
      skip in class InputStream
      Parameters:
      cb - the maximum number of bytes to skip over
      Returns:
      the actual number of bytes that were skipped over
      Throws:
      IOException - if an I/O error occurs

    • available

      public int available() throws IOException
      Returns the number of bytes that can be read (or skipped over) from this input stream without causing a blocking I/O condition to occur. This method reflects the assumed implementation of various buffering InputStreams, which can guarantee non-blocking reads up to the extent of their buffers, but beyond that the read operations will have to read from some underlying (and potentially blocking) source.
      Specified by:
      available in interface com.oracle.coherence.common.io.InputStreaming
      Overrides:
      available in class InputStream
      Returns:
      the number of bytes that can be read from this InputStream without blocking
      Throws:
      IOException - if an I/O error occurs

    • close

      public void close() throws IOException
      Close the InputStream and release any system resources associated with it.
      Specified by:
      close in interface AutoCloseable
      Specified by:
      close in interface Closeable
      Specified by:
      close in interface com.oracle.coherence.common.io.InputStreaming
      Overrides:
      close in class InputStream
      Throws:
      IOException - if an I/O error occurs

    • mark

      public void mark(int cbReadLimit)
      Marks the current read position in the InputStream in order to support the stream to be later "rewound" (using the reset() method) to the current position. The caller passes in the maximum number of bytes that it expects to read before calling the reset() method, thus indicating the upper bounds of the responsibility of the stream to be able to buffer what it has read in order to support this functionality.
      Specified by:
      mark in interface com.oracle.coherence.common.io.InputStreaming
      Overrides:
      mark in class InputStream
      Parameters:
      cbReadLimit - the maximum number of bytes that caller expects the InputStream to be able to read before the mark position becomes invalid

    • reset

      public void reset() throws IOException
      Rewind this stream to the position at the time the mark(int) method was last called on this InputStream. If the InputStream cannot fulfill this contract, it should throw an IOException.
      Specified by:
      reset in interface com.oracle.coherence.common.io.InputStreaming
      Overrides:
      reset in class InputStream
      Throws:
      IOException - if an I/O error occurs, for example if this has not been marked or if the mark has been invalidated

    • markSupported

      public boolean markSupported()
      Determine if this InputStream supports the mark(int) and reset() methods.
      Specified by:
      markSupported in interface com.oracle.coherence.common.io.InputStreaming
      Overrides:
      markSupported in class InputStream
      Returns:
      true if this InputStream supports the mark and reset method; false otherwise