Check in protobuf java code and generate lite jar.

third_party/protobuf/java/src/main/java/com/google/protobuf/ByteString.java

Index: third_party/protobuf/java/src/main/java/com/google/protobuf/ByteString.java
diff --git a/third_party/protobuf/java/src/main/java/com/google/protobuf/ByteString.java b/third_party/protobuf/java/src/main/java/com/google/protobuf/ByteString.java
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf;
+
+import java.io.InputStream;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.FilterOutputStream;
+import java.io.UnsupportedEncodingException;
+import java.nio.ByteBuffer;
+import java.util.List;
+
+/**
+ * Immutable array of bytes.
+ *
+ * @author crazybob@google.com Bob Lee
+ * @author kenton@google.com Kenton Varda
+ */
+public final class ByteString {
+  private final byte[] bytes;
+
+  private ByteString(final byte[] bytes) {
+    this.bytes = bytes;
+  }
+
+  /**
+   * Gets the byte at the given index.
+   *
+   * @throws ArrayIndexOutOfBoundsException {@code index} is < 0 or >= size
+   */
+  public byte byteAt(final int index) {
+    return bytes[index];
+  }
+
+  /**
+   * Gets the number of bytes.
+   */
+  public int size() {
+    return bytes.length;
+  }
+
+  /**
+   * Returns {@code true} if the size is {@code 0}, {@code false} otherwise.
+   */
+  public boolean isEmpty() {
+    return bytes.length == 0;
+  }
+
+  // =================================================================
+  // byte[] -> ByteString
+
+  /**
+   * Empty ByteString.
+   */
+  public static final ByteString EMPTY = new ByteString(new byte[0]);
+
+  /**
+   * Copies the given bytes into a {@code ByteString}.
+   */
+  public static ByteString copyFrom(final byte[] bytes, final int offset,
+                                    final int size) {
+    final byte[] copy = new byte[size];
+    System.arraycopy(bytes, offset, copy, 0, size);
+    return new ByteString(copy);
+  }
+
+  /**
+   * Copies the given bytes into a {@code ByteString}.
+   */
+  public static ByteString copyFrom(final byte[] bytes) {
+    return copyFrom(bytes, 0, bytes.length);
+  }
+
+  /**
+   * Copies {@code size} bytes from a {@code java.nio.ByteBuffer} into
+   * a {@code ByteString}.
+   */
+  public static ByteString copyFrom(final ByteBuffer bytes, final int size) {
+    final byte[] copy = new byte[size];
+    bytes.get(copy);
+    return new ByteString(copy);
+  }
+
+  /**
+   * Copies the remaining bytes from a {@code java.nio.ByteBuffer} into
+   * a {@code ByteString}.
+   */
+  public static ByteString copyFrom(final ByteBuffer bytes) {
+    return copyFrom(bytes, bytes.remaining());
+  }
+
+  /**
+   * Encodes {@code text} into a sequence of bytes using the named charset
+   * and returns the result as a {@code ByteString}.
+   */
+  public static ByteString copyFrom(final String text, final String charsetName)
+      throws UnsupportedEncodingException {
+    return new ByteString(text.getBytes(charsetName));
+  }
+
+  /**
+   * Encodes {@code text} into a sequence of UTF-8 bytes and returns the
+   * result as a {@code ByteString}.
+   */
+  public static ByteString copyFromUtf8(final String text) {
+    try {
+      return new ByteString(text.getBytes("UTF-8"));
+    } catch (UnsupportedEncodingException e) {
+      throw new RuntimeException("UTF-8 not supported?", e);
+    }
+  }
+
+  /**
+   * Concatenates all byte strings in the list and returns the result.
+   *
+   * <p>The returned {@code ByteString} is not necessarily a unique object.
+   * If the list is empty, the returned object is the singleton empty
+   * {@code ByteString}.  If the list has only one element, that
+   * {@code ByteString} will be returned without copying.
+   */
+  public static ByteString copyFrom(List<ByteString> list) {
+    if (list.size() == 0) {
+      return EMPTY;
+    } else if (list.size() == 1) {
+      return list.get(0);
+    }
+
+    int size = 0;
+    for (ByteString str : list) {
+      size += str.size();
+    }
+    byte[] bytes = new byte[size];
+    int pos = 0;
+    for (ByteString str : list) {
+      System.arraycopy(str.bytes, 0, bytes, pos, str.size());
+      pos += str.size();
+    }
+    return new ByteString(bytes);
+  }
+
+  // =================================================================
+  // ByteString -> byte[]
+
+  /**
+   * Copies bytes into a buffer at the given offset.
+   *
+   * @param target buffer to copy into
+   * @param offset in the target buffer
+   */
+  public void copyTo(final byte[] target, final int offset) {
+    System.arraycopy(bytes, 0, target, offset, bytes.length);
+  }
+
+  /**
+   * Copies bytes into a buffer.
+   *
+   * @param target buffer to copy into
+   * @param sourceOffset offset within these bytes
+   * @param targetOffset offset within the target buffer
+   * @param size number of bytes to copy
+   */
+  public void copyTo(final byte[] target, final int sourceOffset,
+                     final int targetOffset,
+      final int size) {
+    System.arraycopy(bytes, sourceOffset, target, targetOffset, size);
+  }
+
+  /**
+   * Copies bytes into a ByteBuffer.
+   *
+   * @param target ByteBuffer to copy into.
+   * @throws ReadOnlyBufferException if the {@code target} is read-only
+   * @throws BufferOverflowException if the {@code target}'s remaining()
+   *         space is not large enough to hold the data.
+   */
+  public void copyTo(ByteBuffer target) {
+    target.put(bytes, 0, bytes.length);
+  }
+
+  /**
+   * Copies bytes to a {@code byte[]}.
+   */
+  public byte[] toByteArray() {
+    final int size = bytes.length;
+    final byte[] copy = new byte[size];
+    System.arraycopy(bytes, 0, copy, 0, size);
+    return copy;
+  }
+
+  /**
+   * Constructs a new read-only {@code java.nio.ByteBuffer} with the
+   * same backing byte array.
+   */
+  public ByteBuffer asReadOnlyByteBuffer() {
+    final ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
+    return byteBuffer.asReadOnlyBuffer();
+  }
+
+  /**
+   * Constructs a new {@code String} by decoding the bytes using the
+   * specified charset.
+   */
+  public String toString(final String charsetName)
+      throws UnsupportedEncodingException {
+    return new String(bytes, charsetName);
+  }
+
+  /**
+   * Constructs a new {@code String} by decoding the bytes as UTF-8.
+   */
+  public String toStringUtf8() {
+    try {
+      return new String(bytes, "UTF-8");
+    } catch (UnsupportedEncodingException e) {
+      throw new RuntimeException("UTF-8 not supported?", e);
+    }
+  }
+
+  // =================================================================
+  // equals() and hashCode()
+
+  @Override
+  public boolean equals(final Object o) {
+    if (o == this) {
+      return true;
+    }
+
+    if (!(o instanceof ByteString)) {
+      return false;
+    }
+
+    final ByteString other = (ByteString) o;
+    final int size = bytes.length;
+    if (size != other.bytes.length) {
+      return false;
+    }
+
+    final byte[] thisBytes = bytes;
+    final byte[] otherBytes = other.bytes;
+    for (int i = 0; i < size; i++) {
+      if (thisBytes[i] != otherBytes[i]) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  private volatile int hash = 0;
+
+  @Override
+  public int hashCode() {
+    int h = hash;
+
+    if (h == 0) {
+      final byte[] thisBytes = bytes;
+      final int size = bytes.length;
+
+      h = size;
+      for (int i = 0; i < size; i++) {
+        h = h * 31 + thisBytes[i];
+      }
+      if (h == 0) {
+        h = 1;
+      }
+
+      hash = h;
+    }
+
+    return h;
+  }
+
+  // =================================================================
+  // Input stream
+
+  /**
+   * Creates an {@code InputStream} which can be used to read the bytes.
+   */
+  public InputStream newInput() {
+    return new ByteArrayInputStream(bytes);
+  }
+
+  /**
+   * Creates a {@link CodedInputStream} which can be used to read the bytes.
+   * Using this is more efficient than creating a {@link CodedInputStream}
+   * wrapping the result of {@link #newInput()}.
+   */
+  public CodedInputStream newCodedInput() {
+    // We trust CodedInputStream not to modify the bytes, or to give anyone
+    // else access to them.
+    return CodedInputStream.newInstance(bytes);
+  }
+
+  // =================================================================
+  // Output stream
+
+  /**
+   * Creates a new {@link Output} with the given initial capacity.
+   */
+  public static Output newOutput(final int initialCapacity) {
+    return new Output(new ByteArrayOutputStream(initialCapacity));
+  }
+
+  /**
+   * Creates a new {@link Output}.
+   */
+  public static Output newOutput() {
+    return newOutput(32);
+  }
+
+  /**
+   * Outputs to a {@code ByteString} instance. Call {@link #toByteString()} to
+   * create the {@code ByteString} instance.
+   */
+  public static final class Output extends FilterOutputStream {
+    private final ByteArrayOutputStream bout;
+
+    /**
+     * Constructs a new output with the given initial capacity.
+     */
+    private Output(final ByteArrayOutputStream bout) {
+      super(bout);
+      this.bout = bout;
+    }
+
+    /**
+     * Creates a {@code ByteString} instance from this {@code Output}.
+     */
+    public ByteString toByteString() {
+      final byte[] byteArray = bout.toByteArray();
+      return new ByteString(byteArray);
+    }
+  }
+
+  /**
+   * Constructs a new ByteString builder, which allows you to efficiently
+   * construct a {@code ByteString} by writing to a {@link CodedOutputStream}.
+   * Using this is much more efficient than calling {@code newOutput()} and
+   * wrapping that in a {@code CodedOutputStream}.
+   *
+   * <p>This is package-private because it's a somewhat confusing interface.
+   * Users can call {@link Message#toByteString()} instead of calling this
+   * directly.
+   *
+   * @param size The target byte size of the {@code ByteString}.  You must
+   *             write exactly this many bytes before building the result.
+   */
+  static CodedBuilder newCodedBuilder(final int size) {
+    return new CodedBuilder(size);
+  }
+
+  /** See {@link ByteString#newCodedBuilder(int)}. */
+  static final class CodedBuilder {
+    private final CodedOutputStream output;
+    private final byte[] buffer;
+
+    private CodedBuilder(final int size) {
+      buffer = new byte[size];
+      output = CodedOutputStream.newInstance(buffer);
+    }
+
+    public ByteString build() {
+      output.checkNoSpaceLeft();
+
+      // We can be confident that the CodedOutputStream will not modify the
+      // underlying bytes anymore because it already wrote all of them.  So,
+      // no need to make a copy.
+      return new ByteString(buffer);
+    }
+
+    public CodedOutputStream getCodedOutput() {
+      return output;
+    }
+  }
+}