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authorgregor <gregor@d688527b-c9ab-4aba-bd8d-4036d912da1d>2003-07-07 10:58:37 +0000
committergregor <gregor@d688527b-c9ab-4aba-bd8d-4036d912da1d>2003-07-07 10:58:37 +0000
commitece7d18cf35374bf4e26d041799cda8f791c89f8 (patch)
tree33707cb77627b65a2a4e7327a2e93fb7751c1b76 /spss.server/src/at/gv/egovernment/moa/spss/server/util
parent273aed93c03b18a6c6bb1af745ae46a13ad3c7f2 (diff)
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Initial commit
git-svn-id: https://joinup.ec.europa.eu/svn/moa-idspss/trunk@2 d688527b-c9ab-4aba-bd8d-4036d912da1d
Diffstat (limited to 'spss.server/src/at/gv/egovernment/moa/spss/server/util')
-rw-r--r--spss.server/src/at/gv/egovernment/moa/spss/server/util/IdGenerator.java61
1 files changed, 61 insertions, 0 deletions
diff --git a/spss.server/src/at/gv/egovernment/moa/spss/server/util/IdGenerator.java b/spss.server/src/at/gv/egovernment/moa/spss/server/util/IdGenerator.java
new file mode 100644
index 000000000..92e8cb0f8
--- /dev/null
+++ b/spss.server/src/at/gv/egovernment/moa/spss/server/util/IdGenerator.java
@@ -0,0 +1,61 @@
+package at.gv.egovernment.moa.spss.server.util;
+
+import java.util.Set;
+
+/**
+ * Generate unique ID values for various objects in the response.
+ *
+ * @author Patrick Peck
+ * @version $Id$
+ */
+public class IdGenerator {
+ /** The base value to append the counter to. */
+ private String base;
+ /** The <code>Set</code> of reserved ID values. */
+ private Set reserved;
+ /** The sequence number. */
+ private int count;
+
+ /**
+ * Create a new <code>IdGenerator</code>.
+ *
+ * @param base A base value to append the IDs to. The creator of this object
+ * should provide a base value, so that appending the counter leads to unique
+ * IDs.
+ * @param reserved The <code>Set</code> of reserved IDs. A call to
+ * <code>uniqueId()</code> will respect the reserved IDs.
+ */
+ public IdGenerator(String base, Set reserved) {
+ this.base = base;
+ this.reserved = reserved;
+ count = 1;
+ }
+
+ /**
+ * Create the next ID value in the sequence.
+ *
+ * @return The next ID value in the sequence.
+ */
+ public String nextId() {
+ return base + "-" + count++;
+ }
+
+ /**
+ * Create the next unique ID value which is unique in the reserved ID set.
+ *
+ * The created ID is added to the set of reserved IDs.
+ *
+ * @return The next ID value.
+ */
+ public String uniqueId() {
+ String nextId;
+
+ while (reserved.contains(nextId = nextId()));
+
+ reserved.add(nextId);
+
+ return nextId;
+
+ }
+
+}