Remove references to non-std Java classes. [DO NOT MERGE]

This change adds a substitute for the Charsets class in java namespace.
The original cherry pick of the change had dropped this substitute. But
the substitute is required for bug b.android.com/59732

The original cherry-pick is 6335590aa8 and
the original change is 81f74f4bc9
The original Change-Id is Iac5b272652e2780c9bb72d19f415d150948ca589

Change-Id: I76c87c74ee088778b37d1a7a7d531e0fde5c758f

tools/layoutlib/create/README.txt

@@ -172,7 +172,8 @@ This is the easiest: we currently inject the following classes:
 - AutoCloseable is part of Java 7. To enable us to still run on Java 6, a new class is
   injected. The implementation for the class has been taken from Android's libcore
   (platform/libcore/luni/src/main/java/java/lang/AutoCloseable.java).
-- ModifiedUtf8, IntegralToString and UnsafeByteSequence are not part of the standard JAVA VM.
+- Charsets, ModifiedUtf8, IntegralToString and UnsafeByteSequence are not part of the
+  standard JAVA VM.
   They are added to the Dalvik VM for performance reasons. An implementation that is very
   close to the original (which is at platform/libcore/luni/src/main/java/...) is injected.
   Since these classees were in part of the java package, where we can't inject classes,

tools/layoutlib/create/src/com/android/tools/layoutlib/create/CreateInfo.java

@@ -19,6 +19,7 @@ package com.android.tools.layoutlib.create;
 import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
 import com.android.tools.layoutlib.java.AutoCloseable;
 import com.android.tools.layoutlib.java.ModifiedUtf8;
+import com.android.tools.layoutlib.java.Charsets;
 import com.android.tools.layoutlib.java.IntegralToString;
 import com.android.tools.layoutlib.java.UnsafeByteSequence;
 
@@ -114,6 +115,7 @@ public final class CreateInfo implements ICreateInfo {
             IntegralToString.class,
             UnsafeByteSequence.class,
             ModifiedUtf8.class,
+            Charsets.class,
         };
 
     /**
@@ -222,6 +224,7 @@ public final class CreateInfo implements ICreateInfo {
         new String[] {
             "java.lang.AutoCloseable",                         "com.android.tools.layoutlib.java.AutoCloseable",
             "java.nio.charset.ModifiedUtf8",                   "com.android.tools.layoutlib.java.ModifiedUtf8",
+            "java.nio.charset.Charsets",                       "com.android.tools.layoutlib.java.Charsets",
             "java.lang.IntegralToString",                      "com.android.tools.layoutlib.java.IntegralToString",
             "java.lang.UnsafeByteSequence",                    "com.android.tools.layoutlib.java.UnsafeByteSequence",
         };

tools/layoutlib/create/src/com/android/tools/layoutlib/java/Charsets.java

@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2013 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 com.android.tools.layoutlib.java;
+
+import java.nio.CharBuffer;
+import java.nio.charset.Charset;
+
+/**
+ * Defines the same class as the java.nio.charset.Charsets which was added in
+ * Dalvik VM. This hack, provides a replacement for that class which can't be
+ * loaded in the standard JVM since it's in the java package and standard JVM
+ * doesn't have it. An implementation of the native methods in the original
+ * class has been added.
+ * <p/>
+ * Extracted from API level 18, file:
+ * platform/libcore/luni/src/main/java/java/nio/charset/Charsets
+ */
+public final class Charsets {
+    /**
+     * A cheap and type-safe constant for the ISO-8859-1 Charset.
+     */
+    public static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
+
+    /**
+     * A cheap and type-safe constant for the US-ASCII Charset.
+     */
+    public static final Charset US_ASCII = Charset.forName("US-ASCII");
+
+    /**
+     * A cheap and type-safe constant for the UTF-8 Charset.
+     */
+    public static final Charset UTF_8 = Charset.forName("UTF-8");
+
+    /**
+     * Returns a new byte array containing the bytes corresponding to the given characters,
+     * encoded in US-ASCII. Unrepresentable characters are replaced by (byte) '?'.
+     */
+    public static byte[] toAsciiBytes(char[] chars, int offset, int length) {
+        CharBuffer cb = CharBuffer.allocate(length);
+        cb.put(chars, offset, length);
+        return US_ASCII.encode(cb).array();
+    }
+
+    /**
+     * Returns a new byte array containing the bytes corresponding to the given characters,
+     * encoded in ISO-8859-1. Unrepresentable characters are replaced by (byte) '?'.
+     */
+    public static byte[] toIsoLatin1Bytes(char[] chars, int offset, int length) {
+        CharBuffer cb = CharBuffer.allocate(length);
+        cb.put(chars, offset, length);
+        return ISO_8859_1.encode(cb).array();
+    }
+
+    /**
+     * Returns a new byte array containing the bytes corresponding to the given characters,
+     * encoded in UTF-8. All characters are representable in UTF-8.
+     */
+    public static byte[] toUtf8Bytes(char[] chars, int offset, int length) {
+        CharBuffer cb = CharBuffer.allocate(length);
+        cb.put(chars, offset, length);
+        return UTF_8.encode(cb).array();
+    }
+
+    /**
+     * Returns a new byte array containing the bytes corresponding to the given characters,
+     * encoded in UTF-16BE. All characters are representable in UTF-16BE.
+     */
+    public static byte[] toBigEndianUtf16Bytes(char[] chars, int offset, int length) {
+        byte[] result = new byte[length * 2];
+        int end = offset + length;
+        int resultIndex = 0;
+        for (int i = offset; i < end; ++i) {
+            char ch = chars[i];
+            result[resultIndex++] = (byte) (ch >> 8);
+            result[resultIndex++] = (byte) ch;
+        }
+        return result;
+    }
+
+    /**
+     * Decodes the given US-ASCII bytes into the given char[]. Equivalent to but faster than:
+     *
+     * for (int i = 0; i < count; ++i) {
+     *     char ch = (char) (data[start++] & 0xff);
+     *     value[i] = (ch <= 0x7f) ? ch : REPLACEMENT_CHAR;
+     * }
+     */
+    public static void asciiBytesToChars(byte[] bytes, int offset, int length, char[] chars) {
+        if (bytes == null || chars == null) {
+            return;
+        }
+        final char REPLACEMENT_CHAR = (char)0xffd;
+        int start = offset;
+        for (int i = 0; i < length; ++i) {
+            char ch = (char) (bytes[start++] & 0xff);
+            chars[i] = (ch <= 0x7f) ? ch : REPLACEMENT_CHAR;
+        }
+    }
+
+    /**
+     * Decodes the given ISO-8859-1 bytes into the given char[]. Equivalent to but faster than:
+     *
+     * for (int i = 0; i < count; ++i) {
+     *     value[i] = (char) (data[start++] & 0xff);
+     * }
+     */
+    public static void isoLatin1BytesToChars(byte[] bytes, int offset, int length, char[] chars) {
+        if (bytes == null || chars == null) {
+            return;
+        }
+        int start = offset;
+        for (int i = 0; i < length; ++i) {
+            chars[i] = (char) (bytes[start++] & 0xff);
+        }
+    }
+
+    private Charsets() {
+    }
+}