Added support for serializing collections of Externalizable objects.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@8148 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/util/cache/DummyExternalizableUtil.java

@@ -12,7 +12,9 @@ package org.jivesoftware.util.cache;
 
 import java.io.DataInput;
 import java.io.DataOutput;
+import java.io.Externalizable;
 import java.io.IOException;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -150,4 +152,15 @@ public class DummyExternalizableUtil implements ExternalizableUtilStrategy {
         // Do nothing
         return "";
     }
+
+    public void writeExternalizableCollection(DataOutput out, Collection<? extends Externalizable> value)
+            throws IOException {
+        // Do nothing
+    }
+
+    public int readExternalizableCollection(DataInput in, Collection<? extends Externalizable> value,
+                                            ClassLoader loader) throws IOException {
+        // Do nothing
+        return 0;
+    }
 }

src/java/org/jivesoftware/util/cache/ExternalizableUtil.java

@@ -13,7 +13,9 @@ package org.jivesoftware.util.cache;
 
 import java.io.DataInput;
 import java.io.DataOutput;
+import java.io.Externalizable;
 import java.io.IOException;
+import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 
@@ -190,4 +192,31 @@ public class ExternalizableUtil {
     public String readSafeUTF(DataInput in) throws IOException {
         return strategy.readSafeUTF(in);
     }
+
+    /**
+     * Writes a collection of Externalizable objects. The collection passed as a parameter
+     * must be a collection and not a <tt>null</null> value.
+     *
+     * @param out   the output stream.
+     * @param value the collection of Externalizable objects. This value must not be null.
+     * @throws IOException if an error occurs.
+     */
+    public void writeExternalizableCollection(DataOutput out, Collection<? extends Externalizable> value) throws IOException {
+        strategy.writeExternalizableCollection(out, value);
+    }
+
+    /**
+     * Reads a collection of Externalizable objects and adds them to the collection passed as a parameter. The
+     * collection passed as a parameter must be a collection and not a <tt>null</null> value.
+     *
+     * @param in the input stream.
+     * @param value the collection of Externalizable objects. This value must not be null.
+     * @param loader class loader to use to build elements inside of the serialized collection.
+     * @throws IOException if an error occurs.
+     * @return the number of elements added to the collection.
+     */
+    public int readExternalizableCollection(DataInput in, Collection<? extends Externalizable> value, ClassLoader loader)
+            throws IOException {
+        return strategy.readExternalizableCollection(in, value, loader);
+    }
 }

src/java/org/jivesoftware/util/cache/ExternalizableUtilStrategy.java

@@ -12,7 +12,9 @@ package org.jivesoftware.util.cache;
 
 import java.io.DataInput;
 import java.io.DataOutput;
+import java.io.Externalizable;
 import java.io.IOException;
+import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 
@@ -33,7 +35,7 @@ public interface ExternalizableUtilStrategy {
      * @param stringMap the Map of String key/value pairs.
      * @throws java.io.IOException if an error occurs.
      */
-    public void writeStringMap(DataOutput out, Map<String, String> stringMap) throws IOException;
+    void writeStringMap(DataOutput out, Map<String, String> stringMap) throws IOException;
 
     /**
      * Reads a Map of String key and value pairs. This method will return
@@ -43,7 +45,7 @@ public interface ExternalizableUtilStrategy {
      * @return a Map of String key/value pairs.
      * @throws IOException if an error occurs.
      */
-    public Map<String, String> readStringMap(DataInput in) throws IOException;
+    Map<String, String> readStringMap(DataInput in) throws IOException;
 
     /**
      * Writes a Map of Long key and Integer value pairs. This method handles
@@ -53,7 +55,7 @@ public interface ExternalizableUtilStrategy {
      * @param map the Map of Long key/Integer value pairs.
      * @throws IOException if an error occurs.
      */
-    public void writeLongIntMap(DataOutput out, Map<Long, Integer> map) throws IOException;
+    void writeLongIntMap(DataOutput out, Map<Long, Integer> map) throws IOException;
 
     /**
      * Reads a Map of Long key and Integer value pairs. This method will return
@@ -63,7 +65,7 @@ public interface ExternalizableUtilStrategy {
      * @return a Map of Long key/Integer value pairs.
      * @throws IOException if an error occurs.
      */
-    public Map readLongIntMap(DataInput in) throws IOException;
+    Map readLongIntMap(DataInput in) throws IOException;
 
     /**
      * Writes a List of Strings. This method handles the case when the List is
@@ -73,7 +75,7 @@ public interface ExternalizableUtilStrategy {
      * @param stringList the List of Strings.
      * @throws IOException if an error occurs.
      */
-    public void writeStringList(DataOutput out, List stringList) throws IOException;
+    void writeStringList(DataOutput out, List stringList) throws IOException;
 
     /**
      * Reads a List of Strings. This method will return <tt>null</tt> if the List
@@ -83,7 +85,7 @@ public interface ExternalizableUtilStrategy {
      * @return a List of Strings.
      * @throws IOException if an error occurs.
      */
-    public List<String> readStringList(DataInput in) throws IOException;
+    List<String> readStringList(DataInput in) throws IOException;
 
     /**
      * Writes an array of long values. This method handles the case when the
@@ -93,7 +95,7 @@ public interface ExternalizableUtilStrategy {
      * @param array the array of long values.
      * @throws IOException if an error occurs.
      */
-    public void writeLongArray(DataOutput out, long [] array) throws IOException;
+    void writeLongArray(DataOutput out, long[] array) throws IOException;
 
     /**
      * Reads an array of long values. This method will return <tt>null</tt> if
@@ -103,17 +105,22 @@ public interface ExternalizableUtilStrategy {
      * @return an array of long values.
      * @throws IOException if an error occurs.
      */
-    public long [] readLongArray(DataInput in) throws IOException;
+    long[] readLongArray(DataInput in) throws IOException;
 
-    public void writeLong(DataOutput out, long value) throws IOException;
+    void writeLong(DataOutput out, long value) throws IOException;
 
-    public long readLong(DataInput in) throws IOException;
+    long readLong(DataInput in) throws IOException;
 
-    public void writeBoolean(DataOutput out, boolean value) throws IOException;
+    void writeBoolean(DataOutput out, boolean value) throws IOException;
 
-    public boolean readBoolean(DataInput in) throws IOException;
+    boolean readBoolean(DataInput in) throws IOException;
 
-    public void writeSafeUTF(DataOutput out, String value) throws IOException;
+    void writeSafeUTF(DataOutput out, String value) throws IOException;
 
-    public String readSafeUTF(DataInput in) throws IOException;
+    String readSafeUTF(DataInput in) throws IOException;
+
+    void writeExternalizableCollection(DataOutput out, Collection<? extends Externalizable> value) throws IOException;
+
+    int readExternalizableCollection(DataInput in, Collection<? extends Externalizable> value, ClassLoader loader)
+            throws IOException;
 }
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