File	Doc	Category	Size	Date	Package
SQLInputImpl.java	API Doc	Java SE 5 API	30428	Fri Aug 26 14:57:52 BST 2005	javax.sql.rowset.serial

SQLInputImpl

• java.lang.Object

Fields Summary
private boolean	lastValueWasNull true if the last value returned was SQL NULL; false otherwise.
private int	idx The current index into the array of SQL structured type attributes that will be read from this SQLInputImpl object and mapped to the fields of a class in the Java programming language.
private Object[]	attrib The array of attributes to be read from this stream. The order of the attributes is the same as the order in which they were listed in the SQL definition of the UDT.
private Map	map The type map to use when the method readObject is invoked. This is a java.util.Map object in which there may be zero or more entries. Each entry consists of the fully qualified name of a UDT (the value to be mapped) and the Class object for a class that implements SQLData (the Java class that defines how the UDT will be mapped).

Constructors Summary

public SQLInputImpl(Object[] attributes, Map map) Creates an SQLInputImpl object initialized with the given array of attributes and the given type map. If any of the attributes is a UDT whose name is in an entry in the type map, the attribute will be mapped according to the corresponding SQLData implementation. param attributes an array of Object instances in which each element is an attribute of a UDT. The order of the attributes in the array is the same order in which the attributes were defined in the UDT definition. param map a java.util.Map object containing zero or more entries, with each entry consisting of 1) a String giving the fully qualified name of the UDT and 2) the Class object for the SQLData implementation that defines how the UDT is to be mapped throws SQLException if the attributes or the map is a null value if ((attributes == null) || (map == null)) { throw new SQLException("Cannot instantiate a SQLInputImpl " + "object with null parameters"); } // assign our local reference to the attribute stream attrib = attributes; // init the index point before the head of the stream idx = -1; // set the map this.map = map;

Methods Summary
private java.lang.Object	getNextAttribute() Retrieves the next attribute in this SQLInputImpl object as an Object in the Java programming language. return the next value in the input stream as an Object in the Java programming language throws SQLException if the read position is located at an invalid position or if there are no further values in the stream if (++idx >= attrib.length) { throw new SQLException("SQLInputImpl exception: Invalid read " + "position"); } else { return attrib[idx]; }
public java.sql.Array	readArray() Reads an SQL ARRAY value from the stream and returns it as an Array object in the Java programming language. This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation. return an Array object representing the SQL ARRAY value at the head of the stream; * if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position; or if there are no further values in the stream. Array attrib = (Array)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return null; } else { lastValueWasNull = false; return attrib; }
public java.io.InputStream	readAsciiStream() Returns the next attribute in this SQLInputImpl object as a stream of ASCII characters. This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation. return the attribute; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position; or if there are no further values in the stream. java.io.InputStream attrib = (java.io.InputStream)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return null; } else { lastValueWasNull = false; return attrib; }
public java.math.BigDecimal	readBigDecimal() Retrieves the next attribute in this SQLInputImpl object as a java.math.BigDecimal. This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation. return the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position or if there are no more values in the stream java.math.BigDecimal attrib = (java.math.BigDecimal)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return null; } else { lastValueWasNull = false; return attrib; }
public java.io.InputStream	readBinaryStream() Returns the next attribute in this SQLInputImpl object as a stream of uninterpreted bytes. This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation. return the attribute; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position; or if there are no further values in the stream. java.io.InputStream attrib = (java.io.InputStream)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return null; } else { lastValueWasNull = false; return attrib; }
public java.sql.Blob	readBlob() Retrieves the BLOB value at the head of this SQLInputImpl object as a Blob object in the Java programming language. This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation. return a Blob object representing the SQL BLOB value at the head of this stream; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position; or if there are no further values in the stream. Blob attrib = (Blob)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return null; } else { lastValueWasNull = false; return attrib; }
public boolean	readBoolean() Retrieves the next attribute in this SQLInputImpl object as a boolean in the Java programming language. This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation. return the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position or if there are no further values in the stream. Boolean attrib = (Boolean)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return false; } else { lastValueWasNull = false; return attrib.booleanValue(); }
public byte	readByte() Retrieves the next attribute in this SQLInputImpl object as a byte in the Java programming language. This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation. return the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position or if there are no further values in the stream Byte attrib = (Byte)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return (byte)0; } else { lastValueWasNull = false; return attrib.byteValue(); }
public byte[]	readBytes() Retrieves the next attribute in this SQLInputImpl object as an array of bytes. This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation. return the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position or if there are no more values in the stream byte[] attrib = (byte[])getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return null; } else { lastValueWasNull = false; return attrib; }
public java.io.Reader	readCharacterStream() Retrieves the next attribute in this SQLInputImpl object as a stream of Unicode characters. This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation. return the attribute; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position; or if there are no further values in the stream. java.io.Reader attrib = (java.io.Reader)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return null; } else { lastValueWasNull = false; return attrib; }
public java.sql.Clob	readClob() Retrieves the CLOB value at the head of this SQLInputImpl object as a Clob object in the Java programming language. This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation. return a Clob object representing the SQL CLOB value at the head of the stream; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position; or if there are no further values in the stream. Clob attrib = (Clob)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return null; } else { lastValueWasNull = false; return attrib; }
public java.sql.Date	readDate() Retrieves the next attribute in this SQLInputImpl as a java.sql.Date object. This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation. return the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position or if there are no more values in the stream java.sql.Date attrib = (java.sql.Date)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return null; } else { lastValueWasNull = false; return attrib; }
public double	readDouble() Retrieves the next attribute in this SQLInputImpl object as a double in the Java programming language. This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation. return the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position or if there are no more values in the stream Double attrib = (Double)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return (double)0; } else { lastValueWasNull = false; return attrib.doubleValue(); }
public float	readFloat() Retrieves the next attribute in this SQLInputImpl object as a float in the Java programming language. This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation. return the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position or if there are no more values in the stream Float attrib = (Float)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return (float)0; } else { lastValueWasNull = false; return attrib.floatValue(); }
public int	readInt() Retrieves the next attribute in this SQLInputImpl object as an int in the Java programming language. This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation. return the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position or if there are no more values in the stream Integer attrib = (Integer)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return (int)0; } else { lastValueWasNull = false; return attrib.intValue(); }
public long	readLong() Retrieves the next attribute in this SQLInputImpl object as a long in the Java programming language. This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation. return the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position or if there are no more values in the stream Long attrib = (Long)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return (long)0; } else { lastValueWasNull = false; return attrib.longValue(); }
public java.lang.Object	readObject() Retrieves the value at the head of this SQLInputImpl object as an Object in the Java programming language. The actual type of the object returned is determined by the default mapping of SQL types to types in the Java programming language unless there is a custom mapping, in which case the type of the object returned is determined by this stream's type map. The JDBC technology-enabled driver registers a type map with the stream before passing the stream to the application. When the datum at the head of the stream is an SQL NULL, this method returns null. If the datum is an SQL structured or distinct type with a custom mapping, this method determines the SQL type of the datum at the head of the stream, constructs an object of the appropriate class, and calls the method SQLData.readSQL on that object. The readSQL method then calls the appropriate SQLInputImpl.readXXX methods to retrieve the attribute values from the stream. return the value at the head of the stream as an Object in the Java programming language; null if the value is SQL NULL throws SQLException if the read position is located at an invalid position; or if there are no further values in the stream. Object attrib = (Object)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return null; } else { lastValueWasNull = false; if (attrib instanceof Struct) { Struct s = (Struct)attrib; // look up the class in the map Class c = (Class)map.get(s.getSQLTypeName()); if (c != null) { // create new instance of the class SQLData obj = null; try { obj = (SQLData)c.newInstance(); } catch (java.lang.InstantiationException ex) { throw new SQLException("Unable to instantiate: " + ex.getMessage()); } catch (java.lang.IllegalAccessException ex) { throw new SQLException("Unable to instantiate: " + ex.getMessage()); } // get the attributes from the struct Object attribs[] = s.getAttributes(map); // create the SQLInput "stream" SQLInputImpl sqlInput = new SQLInputImpl(attribs, map); // read the values... obj.readSQL(sqlInput, s.getSQLTypeName()); return (Object)obj; } } return (Object)attrib; }
public java.sql.Ref	readRef() Retrieves the value at the head of this SQLInputImpl object as a Ref object in the Java programming language. return a Ref object representing the SQL REF value at the head of the stream; if the value is SQL NULL return null throws SQLException if the read position is located at an invalid position; or if there are no further values in the stream. Ref attrib = (Ref)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return null; } else { lastValueWasNull = false; return attrib; }
public short	readShort() Retrieves the next attribute in this SQLInputImpl object as a short in the Java programming language. This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation. return the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position or if there are no more values in the stream Short attrib = (Short)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return (short)0; } else { lastValueWasNull = false; return attrib.shortValue(); }
public java.lang.String	readString() Retrieves the next attribute in this SQLInputImpl object as a String in the Java programming language. This method does not perform type-safe checking to determine if the returned type is the expected type; this responsibility is delegated to the UDT mapping as defined by a SQLData implementation. return the next attribute in this SQLInputImpl object; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position or if there are no further values in the stream. String attrib = (String)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return null; } else { lastValueWasNull = false; return attrib; }
public java.sql.Time	readTime() Retrieves the next attribute in this SQLInputImpl object as a java.sql.Time object. This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation. return the attribute; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position; or if there are no further values in the stream. java.sql.Time attrib = (java.sql.Time)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return null; } else { lastValueWasNull = false; return attrib; }
public java.sql.Timestamp	readTimestamp() Retrieves the next attribute in this SQLInputImpl object as a java.sql.Timestamp object. return the attribute; if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position; or if there are no further values in the stream. java.sql.Timestamp attrib = (java.sql.Timestamp)getNextAttribute(); if (attrib == null) { lastValueWasNull = true; return null; } else { lastValueWasNull = false; return attrib; }
public java.net.URL	readURL() Reads an SQL DATALINK value from the stream and returns it as an URL object in the Java programming language. This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation. return an URL object representing the SQL DATALINK value at the head of the stream; * if the value is SQL NULL, return null throws SQLException if the read position is located at an invalid position; or if there are no further values in the stream. throw new SQLException("Operation not supported");
public boolean	wasNull() Ascertains whether the last value read from this SQLInputImpl object was null. return true if the SQL value read most recently was null; otherwise, false; by default it will return false throws SQLException if an error occurs determining the last value read was a null value or not; return lastValueWasNull;