Revision 42170 trunk/org.gvsig.desktop/org.gvsig.desktop.compat.cdc/org.gvsig.fmap.mapcontext/org.gvsig.fmap.mapcontext.api/src/main/java/org/gvsig/fmap/mapcontext/ExtentHistory.java
| ExtentHistory.java | ||
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import org.gvsig.tools.util.Callable; |
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/** |
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* <p><code>ExtentHistory</code> is designed for managing a history of extents.</p> |
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* <p> |
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* <code>ExtentHistory</code> is designed for managing a history of extents. |
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* </p> |
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* <p> |
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* Note: An <i>extent</i> is a rectangular area, with information of its |
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* top-left 2D corner. |
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* </p> |
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* |
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* <p>Note: An <i>extent</i> is a re.setMandatory(true)ctangular area, with information of its top-left 2D corner.</p> |
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* |
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* @author Vicente Caballero Navarro |
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*/ |
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public class ExtentHistory implements Persistent {
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|
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/** |
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* <p>Maximum number of extents that can store.</p> |
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*/ |
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private int NUMREC; |
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/** |
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* <p>Array with the extents.</p> |
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* |
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* @see #hasPrevious() |
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* @see #put(Rectangle2D) |
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* @see #get() |
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* @see #removePrev() |
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*/ |
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private Rectangle2D[] extents; |
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/** |
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* <p> |
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* Maximum number of extents that can store. |
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* </p> |
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*/ |
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private int NUMREC; |
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/** |
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* <p>Number of extents stored.</p> |
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* |
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* @see #hasPrevious() |
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* @see #put(Rectangle2D) |
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* @see #get() |
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* @see #removePrev() |
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*/ |
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private int num = 0; |
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/** |
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* <p> |
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* Array with the extents. |
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* </p> |
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* |
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* @see #hasPrevious() |
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* @see #put(Rectangle2D) |
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* @see #get() |
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* @see #removePrev() |
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*/ |
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private Rectangle2D[] extents; |
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/** |
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* <p>Creates a new instance of <code>ExtentsHistory</code> with an history of 10 extents.</p> |
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*/ |
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public ExtentHistory() {
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this(10); |
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} |
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private Rectangle2D[] extentsNext; |
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/** |
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* <p>Creates a new instance of <code>ExtentsHistory</code> with an history of <code>numEntries</code> extents.</p> |
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* |
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* @param numEntries the maximum number of extents that will store the instance |
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*/ |
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public ExtentHistory(int numEntries) {
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NUMREC = numEntries; |
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extents = new Rectangle2D[NUMREC]; |
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} |
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/** |
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* <p> |
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* Number of extents stored. |
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* </p> |
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* |
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* @see #hasPrevious() |
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* @see #put(Rectangle2D) |
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* @see #get() |
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* @see #removePrev() |
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*/ |
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private int num = 0; |
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/** |
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* <p>Appends the specified extent to the end of this history.</p> |
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* |
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* @param ext the new extent |
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* |
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* @see #get() |
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* @see #hasPrevious() |
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*/ |
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public void put(Rectangle2D ext) {
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if ((ext != null) && ((num < 1) || (ext != extents[num - 1]))) {
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if (num < (NUMREC)) {
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extents[num] = ext; |
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num = num + 1; |
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} else {
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for (int i = 0; i < (NUMREC - 1); i++) {
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extents[i] = extents[i + 1]; |
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} |
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private int numNext = 0; |
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extents[num - 1] = ext; |
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} |
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} |
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} |
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/** |
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* <p> |
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* Creates a new instance of <code>ExtentsHistory</code> with an history of 10 |
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* extents. |
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* </p> |
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*/ |
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public ExtentHistory() {
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this(10); |
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} |
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/** |
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* <p>Returns <code>true</code> if there are extents registered.</p> |
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* |
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* @return <code>true</code> if there are extents registered; <code>false</code> otherwise |
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* |
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* @see #put(Rectangle2D) |
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* @see #removePrev() |
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* @see #get() |
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*/ |
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public boolean hasPrevious() {
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return num > 0; |
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} |
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/** |
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* <p> |
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* Creates a new instance of <code>ExtentsHistory</code> with an history of |
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* <code>numEntries</code> extents. |
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* </p> |
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* |
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* @param numEntries the maximum number of extents that will store the |
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* instance |
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*/ |
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public ExtentHistory(int numEntries) {
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NUMREC = numEntries; |
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extents = new Rectangle2D[NUMREC]; |
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extentsNext = new Rectangle2D[NUMREC]; |
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} |
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/** |
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* <p>Returns the last extent in the history.</p> |
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* |
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* @return the last extent in the history |
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* |
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* @see #put(Rectangle2D) |
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* @see #getXMLEntity() |
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*/ |
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public Rectangle2D get() {
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if (num <= 0) {
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return null; |
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} |
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Rectangle2D ext = extents[num - 1]; |
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/** |
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* <p> |
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* Appends the specified extent to the end of this history. |
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* </p> |
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* |
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* @param ext the new extent |
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* @see #get() |
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* @see #hasPrevious() |
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*/ |
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public void put(Rectangle2D ext) {
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if ((ext != null) && ((num < 1) || (ext != extents[num - 1]))) {
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if (num < (NUMREC)) {
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extents[num] = ext; |
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num = num + 1; |
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} |
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else {
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for (int i = 0; i < (NUMREC - 1); i++) {
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extents[i] = extents[i + 1]; |
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} |
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extents[num - 1] = ext; |
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} |
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} |
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} |
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return ext; |
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} |
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/** |
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* <p> |
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* Returns <code>true</code> if there are extents registered. |
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* </p> |
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* |
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* @return <code>true</code> if there are extents registered; |
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* <code>false</code> otherwise |
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* @see #put(Rectangle2D) |
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* @see #removePrev() |
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* @see #get() |
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*/ |
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public boolean hasPrevious() {
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return num > 0; |
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} |
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/** |
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* <p>Extracts (removing) the last extent from the history.</p> |
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* |
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* @return last extent in the history |
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* |
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* @see #hasPrevious() |
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*/ |
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public Rectangle2D removePrev() {
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if (num <= 0) {
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return null; |
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} |
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Rectangle2D ext = extents[--num]; |
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return ext; |
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} |
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public boolean hasNext() {
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return numNext > 0; |
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} |
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public void loadFromState(PersistentState state) |
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throws PersistenceException {
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num = state.getInt("num");
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NUMREC = state.getInt("numrec");
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extents = (Rectangle2D[]) state.getArray("extents", Rectangle2D.class);
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} |
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/** |
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* <p> |
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* Returns the last extent in the history. |
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* </p> |
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* |
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* @return the last extent in the history |
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* @see #put(Rectangle2D) |
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* @see #getXMLEntity() |
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*/ |
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public Rectangle2D get() {
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if (num <= 0) {
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return null; |
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} |
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Rectangle2D ext = extents[num - 1]; |
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/** |
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* <p> |
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* Returns information of this object. All information is stored as |
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* properties:<br> |
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* </p> |
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* <p> |
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* <b>Properties:</b> |
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* <ul> |
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* <li><i>className</i>: name of this class. |
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* <li><i>num</i>: number of extents registered. |
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* <li><i>numrec</i>: maximum number of extents that can register. |
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* <li><i>extents</i>: . |
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* </ul> |
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* </p> |
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* |
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*/ |
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public void saveToState(PersistentState state) throws PersistenceException {
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state.set("num", num);
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state.set("numrec", NUMREC);
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state.set("extents", extents);
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} |
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return ext; |
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} |
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public Rectangle2D getNext() {
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if (numNext <= 0) {
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return null; |
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} |
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Rectangle2D ext = extentsNext[numNext - 1]; |
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return ext; |
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} |
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/** |
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* <p> |
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* Extracts (removing) the last extent from the history. |
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* </p> |
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* |
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* @return last extent in the history |
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* @see #hasPrevious() |
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*/ |
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public Rectangle2D removePrev() {
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if (num <= 0) {
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return null; |
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} |
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if (numNext < (NUMREC)) {
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extentsNext[numNext] = extents[num - 1]; |
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numNext++; |
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} |
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else {
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for (int i = 0; i < (NUMREC - 1); i++) {
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extentsNext[i] = extentsNext[i + 1]; |
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} |
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extentsNext[numNext - 1] = extents[num - 1]; |
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} |
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public static class RegisterPersistence implements Callable {
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Rectangle2D ext = extents[--num]; |
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return ext; |
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} |
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public Object call() {
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PersistenceManager manager = ToolsLocator.getPersistenceManager(); |
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DynStruct definition = manager.addDefinition( |
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ExtentHistory.class, |
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"ExtentHistory", |
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"ExtentHistory Persistence definition", |
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null, |
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null |
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); |
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definition.addDynFieldInt("num").setMandatory(true);
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definition.addDynFieldInt("numrec").setMandatory(true);
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definition.addDynFieldArray("extents").setClassOfItems(Rectangle2D.class).setMandatory(true);
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return Boolean.TRUE; |
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} |
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/** |
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* <p> |
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* Extracts (removing) the last extent from the history. |
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* </p> |
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* |
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* @return last extent in the history |
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* @see #hasNext() |
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*/ |
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public Rectangle2D removeNext() {
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if (numNext <= 0) {
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return null; |
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} |
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|
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if (num < (NUMREC)) {
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extents[num] = extentsNext[numNext - 1]; |
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} |
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else {
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for (int i = 0; i < (NUMREC - 1); i++) {
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extents[i] = extents[i + 1]; |
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} |
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extents[num - 1] = extentsNext[numNext - 1]; |
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} |
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Rectangle2D ext = extentsNext[--numNext]; |
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return ext; |
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} |
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|
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|
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public void clear() {
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num = 0; |
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numNext = 0; |
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} |
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|
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|
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public void loadFromState(PersistentState state) throws PersistenceException {
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num = state.getInt("num");
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NUMREC = state.getInt("numrec");
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extents = (Rectangle2D[]) state.getArray("extents", Rectangle2D.class);
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extentsNext = (Rectangle2D[]) state.getArray("extentsNext",
|
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Rectangle2D.class); |
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} |
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|
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/** |
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* <p> |
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* Returns information of this object. All information is stored as |
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* properties:<br> |
|
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* </p> |
|
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* <p> |
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* <b>Properties:</b> |
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* <ul> |
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* <li><i>className</i>: name of this class. |
|
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* <li><i>num</i>: number of extents registered. |
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* <li><i>numrec</i>: maximum number of extents that can register. |
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* <li><i>extents</i>: . |
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* </ul> |
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* </p> |
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*/ |
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public void saveToState(PersistentState state) throws PersistenceException {
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|
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state.set("num", num);
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state.set("numrec", NUMREC);
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state.set("extents", extents);
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state.set("extentsNext", extentsNext);
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} |
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|
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public static class RegisterPersistence implements Callable {
|
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|
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public Object call() {
|
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PersistenceManager manager = ToolsLocator.getPersistenceManager(); |
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DynStruct definition = manager.addDefinition(ExtentHistory.class, |
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"ExtentHistory", "ExtentHistory Persistence definition", null, null); |
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definition.addDynFieldInt("num").setMandatory(true);
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definition.addDynFieldInt("numrec").setMandatory(true);
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definition.addDynFieldArray("extents").setClassOfItems(Rectangle2D.class)
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.setMandatory(true); |
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definition.addDynFieldArray("extentsNext")
|
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.setClassOfItems(Rectangle2D.class).setMandatory(true); |
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return Boolean.TRUE; |
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} |
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} |
|
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} |
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