Java Doc for Btree.java in  » Database-DBMS » Quadcap-Embeddable-Database » com » quadcap » sql » index » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » Quadcap Embeddable Database » com.quadcap.sql.index   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    com.quadcap.sql.index.Btree Btree public class Btree implements BIndex(Code) A Btree implementation. Most of the real work happens in the Bnode class. author:    Stan Bailes Field Summary  Set activeCursors       Comparator compare       BlockFile file       Object lock       Bnode root       long rootBlock       byte[] tbuf      Constructor Summary public   Btree(BlockFile file, Comparator compare, long rootBlock, boolean create)      Open a btree index. public   Btree(BlockFile file, long rootBlock, boolean create)      Open a btree index. Method Summary public  boolean delete(byte[] key)      public  boolean deleteObs(byte[] key)      public  void display(PrintWriter w)      public  void free()      public  int get(byte[] key, int klen, byte[] data)      Get the data bytes for the specified key. public  byte[] get(byte[] key)      public  Comparator getComparator()      public  BCursor getCursor()      public  BCursor getCursor(boolean skipSetup)      public  BlockFile getFile()      Return a reference to the underlying BlockFile  Bnode getNode(long ref)       Bnode getRoot()      public  long getRootBlock()      public  void insert(byte[] key, int klen, byte[] val, int off, int len)      public  void notifyUpdate(BCursor notMe)      public  void releaseCursor(BCursor c)      public  void set(byte[] key, byte[] val)      public  boolean set(byte[] key, int klen, byte[] val, int off, int len)       void setRoot(long ref)      public  int size()      public  String toString()      public  void update(byte[] key, int klen, byte[] val, int off, int len)      Field Detail activeCursors Set activeCursors(Code) compare Comparator compare(Code) file BlockFile file(Code) lock Object lock(Code) root Bnode root(Code) rootBlock long rootBlock(Code) tbuf byte[] tbuf(Code) Constructor Detail Btree public Btree(BlockFile file, Comparator compare, long rootBlock, boolean create) throws IOException(Code) Open a btree index. Fetch the root block and create an empty tree if the block is zero, open the existing tree otherwise. Parameters:   file - the (already opened) blockfile Parameters:   compare - the compare function for key ordering Parameters:   rootBlock - the block number of the root block of this tree Parameters:   create - if true, initialize the rootblock to be empty. exception:   IOException - if an I/O error occurs opening or accessingthe file. Btree public Btree(BlockFile file, long rootBlock, boolean create) throws IOException(Code) Open a btree index. Fetch the root block and create an empty tree if the block is zero, open the existing tree otherwise. Parameters:   file - the (already opened) blockfile Parameters:   rootBlock - the block number of the root block of this tree Parameters:   create - if true, initialize the rootblock to be empty. exception:   IOException - if an I/O error occurs opening or accessingthe file. Method Detail delete public boolean delete(byte[] key) throws IOException(Code) deleteObs public boolean deleteObs(byte[] key) throws IOException(Code) display public void display(PrintWriter w) throws IOException(Code) free public void free() throws IOException(Code) Destroy this tree and free all of its resources get public int get(byte[] key, int klen, byte[] data) throws IOException(Code) Get the data bytes for the specified key. If the key is found, return the length of the data portion and place as many bytes as will fit in the data array. If the key isn't found, return -1. get public byte[] get(byte[] key) throws IOException(Code) getComparator public Comparator getComparator()(Code) Return the comparator used to collate keys getCursor public BCursor getCursor() throws IOException(Code) Get a cursor getCursor public BCursor getCursor(boolean skipSetup) throws IOException(Code) Get a cursor getFile public BlockFile getFile()(Code) Return a reference to the underlying BlockFile getNode Bnode getNode(long ref)(Code) getRoot Bnode getRoot()(Code) getRootBlock public long getRootBlock()(Code) insert public void insert(byte[] key, int klen, byte[] val, int off, int len) throws IOException(Code) notifyUpdate public void notifyUpdate(BCursor notMe)(Code) releaseCursor public void releaseCursor(BCursor c)(Code) set public void set(byte[] key, byte[] val) throws IOException(Code) set public boolean set(byte[] key, int klen, byte[] val, int off, int len) throws IOException(Code) setRoot void setRoot(long ref)(Code) size public int size() throws IOException(Code) toString public String toString()(Code) update public void update(byte[] key, int klen, byte[] val, int off, int len) throws IOException(Code) Methods inherited from java.lang.Object native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object obj)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final native public Class getClass()(Code)(Java Doc) native public int hashCode()(Code)(Java Doc) final native public void notify()(Code)(Java Doc) final native public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc) final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)