Add LinkAddress
LinkAddress stores IP address + prefix for a network link
Change-Id: Id3e74e9d0a62121d097ebdc9be064eeea257ba1f
diff --git a/core/java/android/net/LinkAddress.java b/core/java/android/net/LinkAddress.java
new file mode 100644
index 0000000..cb302da
--- /dev/null
+++ b/core/java/android/net/LinkAddress.java
@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.net;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+
+import java.net.InetAddress;
+import java.net.InterfaceAddress;
+import java.net.UnknownHostException;
+
+/**
+ * Identifies an address of a network link
+ * @hide
+ */
+public class LinkAddress implements Parcelable {
+ /**
+ * IPv4 or IPv6 address.
+ */
+ private final InetAddress address;
+
+ /**
+ * Network prefix
+ */
+ private final int prefix;
+
+ public LinkAddress(InetAddress address, InetAddress mask) {
+ this.address = address;
+ this.prefix = computeprefix(mask);
+ }
+
+ public LinkAddress(InetAddress address, int prefix) {
+ this.address = address;
+ this.prefix = prefix;
+ }
+
+ public LinkAddress(InterfaceAddress interfaceAddress) {
+ this.address = interfaceAddress.getAddress();
+ this.prefix = interfaceAddress.getNetworkPrefixLength();
+ }
+
+ private static int computeprefix(InetAddress mask) {
+ int count = 0;
+ for (byte b : mask.getAddress()) {
+ for (int i = 0; i < 8; ++i) {
+ if ((b & (1 << i)) != 0) {
+ ++count;
+ }
+ }
+ }
+ return count;
+ }
+
+ @Override
+ public String toString() {
+ return (address == null ? "" : (address.getHostAddress() + "/" + prefix));
+ }
+
+ /**
+ * Compares this {@code LinkAddress} instance against the specified address
+ * in {@code obj}. Two addresses are equal if their InetAddress and prefix
+ * are equal
+ *
+ * @param obj the object to be tested for equality.
+ * @return {@code true} if both objects are equal, {@code false} otherwise.
+ */
+ @Override
+ public boolean equals(Object obj) {
+ if (!(obj instanceof LinkAddress)) {
+ return false;
+ }
+ LinkAddress linkAddress = (LinkAddress) obj;
+ return this.address.equals(linkAddress.address) &&
+ this.prefix == linkAddress.prefix;
+ }
+
+ /**
+ * Returns the InetAddress for this address.
+ */
+ public InetAddress getAddress() {
+ return address;
+ }
+
+ /**
+ * Get network prefix length
+ */
+ public int getNetworkPrefix() {
+ return prefix;
+ }
+
+ /**
+ * Implement the Parcelable interface
+ * @hide
+ */
+ public int describeContents() {
+ return 0;
+ }
+
+ /**
+ * Implement the Parcelable interface.
+ * @hide
+ */
+ public void writeToParcel(Parcel dest, int flags) {
+ if (address != null) {
+ dest.writeByte((byte)1);
+ dest.writeByteArray(address.getAddress());
+ dest.writeInt(prefix);
+ } else {
+ dest.writeByte((byte)0);
+ }
+ }
+
+ /**
+ * Implement the Parcelable interface.
+ * @hide
+ */
+ public static final Creator<LinkAddress> CREATOR =
+ new Creator<LinkAddress>() {
+ public LinkAddress createFromParcel(Parcel in) {
+ InetAddress address = null;
+ int prefix = 0;
+ if (in.readByte() == 1) {
+ try {
+ address = InetAddress.getByAddress(in.createByteArray());
+ prefix = in.readInt();
+ } catch (UnknownHostException e) { }
+ }
+ return new LinkAddress(address, prefix);
+ }
+
+ public LinkAddress[] newArray(int size) {
+ return new LinkAddress[size];
+ }
+ };
+}