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hrmsEjb/net/sf/jasperreports/engine/fill/JRClonePool.java

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+package net.sf.jasperreports.engine.fill;
+
+import java.util.HashSet;
+import java.util.LinkedList;
+import java.util.Set;
+import net.sf.jasperreports.engine.JRRuntimeException;
+
+public class JRClonePool {
+  private final JRFillCloneable original;
+  
+  private final LinkedList availableClones;
+  
+  private final boolean trackLockedClones;
+  
+  private final Set lockedClones;
+  
+  public JRClonePool(JRFillCloneable original, boolean trackLockedClones, boolean useOriginal) {
+    this.original = original;
+    this.availableClones = new LinkedList();
+    this.trackLockedClones = trackLockedClones;
+    if (trackLockedClones) {
+      this.lockedClones = new HashSet();
+    } else {
+      this.lockedClones = null;
+    } 
+    if (useOriginal)
+      this.availableClones.add(original); 
+  }
+  
+  public Object getClone() {
+    JRFillCloneable clone;
+    if (this.availableClones.isEmpty()) {
+      JRFillCloneFactory factory = new JRFillCloneFactory();
+      clone = this.original.createClone(factory);
+    } else {
+      clone = this.availableClones.removeFirst();
+    } 
+    if (this.trackLockedClones)
+      this.lockedClones.add(clone); 
+    return clone;
+  }
+  
+  public void releaseClone(Object clone) {
+    if (this.trackLockedClones)
+      if (!this.lockedClones.remove(clone))
+        throw new JRRuntimeException("Cannot release clone.");  
+    this.availableClones.addLast(clone);
+  }
+}