Creates a new Trie with the settings for the trie data.
- *Unserialize the 32-bit-aligned input stream and use the data for the - * trie.
- * @param inputStream file input stream to a ICU data file, containing - * the trie - * @param datamanipulate object which provides methods to parse the char - * data - * @throws IOException thrown when data reading fails - * @draft 2.1 - */ - public IntTrie(InputStream inputStream, DataManipulate datamanipulate) - throws IOException - { - super(inputStream, datamanipulate); - if (!isIntTrie()) { - throw new IllegalArgumentException( - "Data given does not belong to a int trie."); - } - } - - // public methods -------------------------------------------------- - - /** - * Gets the value associated with the codepoint. - * If no value is associated with the codepoint, a default value will be - * returned. - * @param ch codepoint - * @return offset to data - * @draft 2.1 - */ - public final int getCodePointValue(int ch) - { - int offset = getCodePointOffset(ch); - return (offset >= 0) ? m_data_[offset] : m_initialValue_; - } - - /** - * Gets the value to the data which this lead surrogate character points - * to. - * Returned data may contain folding offset information for the next - * trailing surrogate character. - * This method does not guarantee correct results for trail surrogates. - * @param ch lead surrogate character - * @return data value - * @draft 2.1 - */ - public final int getLeadValue(char ch) - { - return m_data_[getLeadOffset(ch)]; - } - - /** - * Get a value from a folding offset (from the value of a lead surrogate) - * and a trail surrogate. - * @param leadvalue the value of a lead surrogate that contains the - * folding offset - * @param trail surrogate - * @return trie data value associated with the trail character - * @draft 2.1 - */ - public final int getTrailValue(int leadvalue, char trail) - { - if (m_dataManipulate_ == null) { - throw new NullPointerException( - "The field DataManipulate in this Trie is null"); - } - int offset = m_dataManipulate_.getFoldingOffset(leadvalue); - if (offset > 0) { - return m_data_[getRawOffset(offset, - (char)(trail & SURROGATE_MASK_))]; - } - return m_initialValue_; - } - - // protected methods ----------------------------------------------- - - /** - *Parses the input stream and stores its trie content into a index and - * data array
- * @param inputStream data input stream containing trie data - * @exception IOException thrown when data reading fails - */ - protected final void unserialize(InputStream inputStream) - throws IOException - { - super.unserialize(inputStream); - // one used for initial value - m_data_ = new int[m_dataLength_]; - DataInputStream input = new DataInputStream(inputStream); - for (int i = 0; i < m_dataLength_; i ++) { - m_data_[i] = input.readInt(); - } - m_initialValue_ = m_data_[0]; - } - - /** - * Gets the offset to the data which the surrogate pair points to. - * @param lead lead surrogate - * @param trail trailing surrogate - * @return offset to data - * @draft 2.1 - */ - protected final int getSurrogateOffset(char lead, char trail) - { - if (m_dataManipulate_ == null) { - throw new NullPointerException( - "The field DataManipulate in this Trie is null"); - } - // get fold position for the next trail surrogate - int offset = m_dataManipulate_.getFoldingOffset(getLeadValue(lead)); - - // get the real data from the folded lead/trail units - if (offset > 0) { - return getRawOffset(offset, (char)(trail & SURROGATE_MASK_)); - } - - // return -1 if there is an error, in this case we return the default - // value: m_initialValue_ - return -1; - } - - /** - * Gets the value at the argument index. - * For use internally in TrieIterator - * @param index value at index will be retrieved - * @return 32 bit value - * @see com.ibm.icu.impl.TrieIterator - * @draft 2.1 - */ - protected final int getValue(int index) - { - return m_data_[index]; - } - - /** - * Gets the default initial value - * @return 32 bit value - * @draft 2.1 - */ - protected final int getInitialValue() - { - return m_initialValue_; - } - - // package private methods ----------------------------------------- - - /** - * Internal constructor for builder use - * @param index the index array to be slotted into this trie - * @param data the data array to be slotted into this trie - * @param initialvalue the initial value for this trie - * @param options trie options to use - * @param datamanipulate folding implementation - */ - IntTrie(char index[], int data[], int initialvalue, int options, - DataManipulate datamanipulate) - { - super(index, options, datamanipulate); - m_data_ = data; - m_dataLength_ = m_data_.length; - m_initialValue_ = initialvalue; - } - - // private data members -------------------------------------------- - - /** - * Default value - */ - private int m_initialValue_; - /** - * Array of char data - */ - private int m_data_[]; -}