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package aQute.bnd.properties;

/**
 * Interface for storing and managing text.
 * 
 * Provides access to the stored text and allows to manipulate it.
 * 
 * 
 * Clients may implement this interface or use 
 * {@code GapTextStore} or 
 * {@code CopyOnWriteTextStore}.
 * 
 */
public interface ITextStore {

	/**
	 * Returns the character at the specified offset.
	 *
	 * @param offset the offset in this text store
	 * @return the character at this offset
	 */
	char get(int offset);

	/**
	 * Returns the text of the specified character range.
	 *
	 * @param offset the offset of the range
	 * @param length the length of the range
	 * @return the text of the range
	 */
	String get(int offset, int length);

	/**
	 * Returns number of characters stored in this text store.
	 *
	 * @return the number of characters stored in this text store
	 */
	int getLength();

	/**
	 * Replaces the specified character range with the given text.
	 * replace(getLength(), 0, "some text") is a valid call and
	 * appends text to the end of the text store.
	 *
	 * @param offset the offset of the range to be replaced
	 * @param length the number of characters to be replaced
	 * @param text the substitution text
	 */
	void replace(int offset, int length, String text);

	/**
	 * Replace the content of the text store with the given text. Convenience
	 * method for replace(0, getLength(), text.
	 *
	 * @param text the new content of the text store
	 */
	void set(String text);
}