Added config app to read address config from json file
diff --git a/apps/config/src/main/java/org/onlab/onos/config/AddressConfiguration.java b/apps/config/src/main/java/org/onlab/onos/config/AddressConfiguration.java
new file mode 100644
index 0000000..580e950
--- /dev/null
+++ b/apps/config/src/main/java/org/onlab/onos/config/AddressConfiguration.java
@@ -0,0 +1,34 @@
+package org.onlab.onos.config;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.codehaus.jackson.annotate.JsonProperty;
+
+/**
+ * Object to store address configuration read from a JSON file.
+ */
+public class AddressConfiguration {
+
+    private List<AddressEntry> addresses;
+
+    /**
+     * Gets a list of addresses in the system.
+     *
+     * @return the list of addresses
+     */
+    public List<AddressEntry> getAddresses() {
+        return Collections.unmodifiableList(addresses);
+    }
+
+    /**
+     * Sets a list of addresses in the system.
+     *
+     * @param addresses the list of addresses
+     */
+    @JsonProperty("addresses")
+    public void setAddresses(List<AddressEntry> addresses) {
+        this.addresses = addresses;
+    }
+
+}
diff --git a/apps/config/src/main/java/org/onlab/onos/config/AddressEntry.java b/apps/config/src/main/java/org/onlab/onos/config/AddressEntry.java
new file mode 100644
index 0000000..318aebd
--- /dev/null
+++ b/apps/config/src/main/java/org/onlab/onos/config/AddressEntry.java
@@ -0,0 +1,53 @@
+package org.onlab.onos.config;
+
+import java.util.List;
+
+import org.codehaus.jackson.annotate.JsonProperty;
+import org.onlab.packet.IpPrefix;
+import org.onlab.packet.MacAddress;
+
+/**
+ * Represents a set of addresses bound to a port.
+ */
+public class AddressEntry {
+    private String dpid;
+    private short portNumber;
+    private List<IpPrefix> ipAddresses;
+    private MacAddress macAddress;
+
+    public String getDpid() {
+        return dpid;
+    }
+
+    @JsonProperty("dpid")
+    public void setDpid(String strDpid) {
+        this.dpid = strDpid;
+    }
+
+    public short getPortNumber() {
+        return portNumber;
+    }
+
+    @JsonProperty("port")
+    public void setPortNumber(short portNumber) {
+        this.portNumber = portNumber;
+    }
+
+    public List<IpPrefix> getIpAddresses() {
+        return ipAddresses;
+    }
+
+    @JsonProperty("ips")
+    public void setIpAddresses(List<IpPrefix> ipAddresses) {
+        this.ipAddresses = ipAddresses;
+    }
+
+    public MacAddress getMacAddress() {
+        return macAddress;
+    }
+
+    @JsonProperty("mac")
+    public void setMacAddress(MacAddress macAddress) {
+        this.macAddress = macAddress;
+    }
+}
diff --git a/apps/config/src/main/java/org/onlab/onos/config/NetworkConfigReader.java b/apps/config/src/main/java/org/onlab/onos/config/NetworkConfigReader.java
new file mode 100644
index 0000000..985c4a2
--- /dev/null
+++ b/apps/config/src/main/java/org/onlab/onos/config/NetworkConfigReader.java
@@ -0,0 +1,90 @@
+package org.onlab.onos.config;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.codehaus.jackson.map.ObjectMapper;
+import org.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.net.PortNumber;
+import org.onlab.onos.net.host.HostAdminService;
+import org.onlab.onos.net.host.PortAddresses;
+import org.slf4j.Logger;
+
+import com.google.common.collect.Sets;
+
+/**
+ * Simple configuration module to read in supplementary network configuration
+ * from a file.
+ */
+@Component(immediate = true)
+public class NetworkConfigReader {
+
+    private final Logger log = getLogger(getClass());
+
+    private static final String DEFAULT_CONFIG_FILE = "config/addresses.json";
+    private String configFileName = DEFAULT_CONFIG_FILE;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected HostAdminService hostAdminService;
+
+    @Activate
+    protected void activate() {
+        log.info("Started network config reader");
+
+        log.info("Config file set to {}", configFileName);
+
+        AddressConfiguration config = readNetworkConfig();
+
+        if (config != null) {
+            for (AddressEntry entry : config.getAddresses()) {
+
+                ConnectPoint cp = new ConnectPoint(
+                        DeviceId.deviceId(dpidToUri(entry.getDpid())),
+                        PortNumber.portNumber(entry.getPortNumber()));
+
+                PortAddresses addresses = new PortAddresses(cp,
+                        Sets.newHashSet(entry.getIpAddresses()),
+                        entry.getMacAddress());
+
+                hostAdminService.bindAddressesToPort(addresses);
+            }
+        }
+    }
+
+    @Deactivate
+    protected void deactivate() {
+        log.info("Stopped");
+    }
+
+    private AddressConfiguration readNetworkConfig() {
+        File configFile = new File(configFileName);
+
+        ObjectMapper mapper = new ObjectMapper();
+
+        try {
+            AddressConfiguration config =
+                    mapper.readValue(configFile, AddressConfiguration.class);
+
+            return config;
+        } catch (FileNotFoundException e) {
+            log.warn("Configuration file not found: {}", configFileName);
+        } catch (IOException e) {
+            log.error("Unable to read config from file:", e);
+        }
+
+        return null;
+    }
+
+    private static String dpidToUri(String dpid) {
+        return "of:" + dpid.replace(":", "");
+    }
+}
diff --git a/apps/config/src/main/java/org/onlab/onos/config/package-info.java b/apps/config/src/main/java/org/onlab/onos/config/package-info.java
new file mode 100644
index 0000000..514a47a
--- /dev/null
+++ b/apps/config/src/main/java/org/onlab/onos/config/package-info.java
@@ -0,0 +1,5 @@
+/**
+ * Simple configuration module to read in supplementary network configuration
+ * from a file.
+ */
+package org.onlab.onos.config;