From 6d5cd507b7ef3e0bad7cc36618b9a3fb158e0bc0 Mon Sep 17 00:00:00 2001
From: Peter Lawrey <peter.lawrey@higherfrequencytrading.com>
Date: Tue, 28 Apr 2015 14:23:36 +0100
Subject: [PATCH] Add a DoubleArray example using ChronicleMap

---
 .../net/openhft/lang/values/DoubleArray.java  | 17 ++++++++++++++-
 .../openhft/lang/values/DoubleArrayTest.java  | 21 +++++++++++++++++++
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/src/test/java/net/openhft/lang/values/DoubleArray.java b/src/test/java/net/openhft/lang/values/DoubleArray.java
index 999867e39..56cd94175 100755
--- a/src/test/java/net/openhft/lang/values/DoubleArray.java
+++ b/src/test/java/net/openhft/lang/values/DoubleArray.java
@@ -16,6 +16,10 @@ public class DoubleArray implements Byteable, Copyable<DoubleArray> {
     private Bytes bytes;
     private long offset;
 
+    // creates an empty DoubleArray
+    public DoubleArray() {
+    }
+
     public DoubleArray(int capacity) {
         bytes = DirectStore.allocate(BASE + capacity * 8L).bytes();
         bytes.writeInt(CAPACITY, capacity);
@@ -45,7 +49,7 @@ public class DoubleArray implements Byteable, Copyable<DoubleArray> {
     }
 
     public int length() {
-        return bytes.readInt(LENGTH + offset);
+        return bytes == null ? 6 * 8 : bytes.readInt(LENGTH + offset);
     }
 
     public int capacity() {
@@ -98,4 +102,15 @@ public class DoubleArray implements Byteable, Copyable<DoubleArray> {
         for (int i = 0; i < length; i++)
             doubleArray.setDataAt(i, getDataAt(i));
     }
+
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("[ ");
+        String sep = "";
+        for (int i = 0, len = length(); i < len; i++) {
+            sb.append(sep).append(getDataAt(i));
+            sep = ", ";
+        }
+        return sb.append(" ]").toString();
+    }
 }
diff --git a/src/test/java/net/openhft/lang/values/DoubleArrayTest.java b/src/test/java/net/openhft/lang/values/DoubleArrayTest.java
index 4192520d9..2868f7b31 100755
--- a/src/test/java/net/openhft/lang/values/DoubleArrayTest.java
+++ b/src/test/java/net/openhft/lang/values/DoubleArrayTest.java
@@ -1,5 +1,7 @@
 package net.openhft.lang.values;
 
+import net.openhft.chronicle.map.ChronicleMap;
+import net.openhft.chronicle.map.ChronicleMapBuilder;
 import org.junit.Test;
 
 import static org.junit.Assert.assertEquals;
@@ -45,4 +47,23 @@ public class DoubleArrayTest {
         // free the memory.
         da.bytes().release();
     }
+
+    @Test
+    public void addToAMap() {
+        DoubleArray a = new DoubleArray(10);
+        a.setData(new double[]{1, 2, 3, 4, 5});
+
+        DoubleArray b = new DoubleArray(10);
+        b.setData(new double[]{5, 6, 7, 8, 9});
+
+
+        ChronicleMap<Integer, DoubleArray> proxyMap = ChronicleMapBuilder.of(Integer.class, DoubleArray.class)
+                .create();
+        proxyMap.put(1, a);
+        proxyMap.put(2, b);
+
+        System.out.println(proxyMap.get(1));
+        System.out.println(proxyMap.get(2));
+        proxyMap.close();
+    }
 }
\ No newline at end of file