241 lines
9.3 KiB
Java
241 lines
9.3 KiB
Java
// Protocol Buffers - Google's data interchange format
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// Copyright 2014 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package com.google.protobuf.nano;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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/**
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* Stores unknown fields. These might be extensions or fields that the generated API doesn't
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* know about yet.
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*/
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class FieldData implements Cloneable {
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private Extension<?, ?> cachedExtension;
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private Object value;
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/** The serialised values for this object. Will be cleared if getValue is called */
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private List<UnknownFieldData> unknownFieldData;
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<T> FieldData(Extension<?, T> extension, T newValue) {
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cachedExtension = extension;
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value = newValue;
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}
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FieldData() {
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unknownFieldData = new ArrayList<UnknownFieldData>();
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}
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void addUnknownField(UnknownFieldData unknownField) {
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unknownFieldData.add(unknownField);
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}
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UnknownFieldData getUnknownField(int index) {
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if (unknownFieldData == null) {
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return null;
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}
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if (index < unknownFieldData.size()) {
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return unknownFieldData.get(index);
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}
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return null;
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}
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int getUnknownFieldSize() {
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if (unknownFieldData == null) {
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return 0;
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}
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return unknownFieldData.size();
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}
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<T> T getValue(Extension<?, T> extension) {
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if (value != null){
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if (cachedExtension != extension) { // Extension objects are singletons.
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throw new IllegalStateException(
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"Tried to getExtension with a differernt Extension.");
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}
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} else {
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cachedExtension = extension;
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value = extension.getValueFrom(unknownFieldData);
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unknownFieldData = null;
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}
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return (T) value;
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}
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<T> void setValue(Extension<?, T> extension, T newValue) {
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cachedExtension = extension;
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value = newValue;
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unknownFieldData = null;
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}
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int computeSerializedSize() {
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int size = 0;
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if (value != null) {
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size = cachedExtension.computeSerializedSize(value);
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} else {
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for (UnknownFieldData unknownField : unknownFieldData) {
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size += unknownField.computeSerializedSize();
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}
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}
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return size;
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}
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void writeTo(CodedOutputByteBufferNano output) throws IOException {
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if (value != null) {
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cachedExtension.writeTo(value, output);
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} else {
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for (UnknownFieldData unknownField : unknownFieldData) {
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unknownField.writeTo(output);
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}
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}
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}
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@Override
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public boolean equals(Object o) {
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if (o == this) {
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return true;
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}
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if (!(o instanceof FieldData)) {
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return false;
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}
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FieldData other = (FieldData) o;
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if (value != null && other.value != null) {
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// If both objects have deserialized values, compare those.
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// Since unknown fields are only compared if messages have generated equals methods
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// we know this will be a meaningful comparison (not identity) for all values.
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if (cachedExtension != other.cachedExtension) { // Extension objects are singletons.
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return false;
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}
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if (!cachedExtension.clazz.isArray()) {
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// Can't test (!cachedExtension.repeated) due to 'bytes' -> 'byte[]'
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return value.equals(other.value);
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}
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if (value instanceof byte[]) {
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return Arrays.equals((byte[]) value, (byte[]) other.value);
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} else if (value instanceof int[]) {
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return Arrays.equals((int[]) value, (int[]) other.value);
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} else if (value instanceof long[]) {
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return Arrays.equals((long[]) value, (long[]) other.value);
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} else if (value instanceof float[]) {
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return Arrays.equals((float[]) value, (float[]) other.value);
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} else if (value instanceof double[]) {
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return Arrays.equals((double[]) value, (double[]) other.value);
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} else if (value instanceof boolean[]) {
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return Arrays.equals((boolean[]) value, (boolean[]) other.value);
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} else {
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return Arrays.deepEquals((Object[]) value, (Object[]) other.value);
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}
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}
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if (unknownFieldData != null && other.unknownFieldData != null) {
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// If both objects have byte arrays compare those directly.
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return unknownFieldData.equals(other.unknownFieldData);
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}
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try {
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// As a last resort, serialize and compare the resulting byte arrays.
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return Arrays.equals(toByteArray(), other.toByteArray());
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} catch (IOException e) {
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// Should not happen.
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throw new IllegalStateException(e);
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}
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}
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@Override
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public int hashCode() {
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int result = 17;
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try {
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// The only way to generate a consistent hash is to use the serialized form.
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result = 31 * result + Arrays.hashCode(toByteArray());
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} catch (IOException e) {
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// Should not happen.
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throw new IllegalStateException(e);
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}
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return result;
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}
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private byte[] toByteArray() throws IOException {
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byte[] result = new byte[computeSerializedSize()];
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CodedOutputByteBufferNano output = CodedOutputByteBufferNano.newInstance(result);
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writeTo(output);
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return result;
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}
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@Override
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public final FieldData clone() {
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FieldData clone = new FieldData();
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try {
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clone.cachedExtension = cachedExtension;
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if (unknownFieldData == null) {
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clone.unknownFieldData = null;
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} else {
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clone.unknownFieldData.addAll(unknownFieldData);
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}
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// Whether we need to deep clone value depends on its type. Primitive reference types
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// (e.g. Integer, Long etc.) are ok, since they're immutable. We need to clone arrays
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// and messages.
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if (value == null) {
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// No cloning required.
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} else if (value instanceof MessageNano) {
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clone.value = ((MessageNano) value).clone();
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} else if (value instanceof byte[]) {
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clone.value = ((byte[]) value).clone();
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} else if (value instanceof byte[][]) {
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byte[][] valueArray = (byte[][]) value;
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byte[][] cloneArray = new byte[valueArray.length][];
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clone.value = cloneArray;
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for (int i = 0; i < valueArray.length; i++) {
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cloneArray[i] = valueArray[i].clone();
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}
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} else if (value instanceof boolean[]) {
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clone.value = ((boolean[]) value).clone();
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} else if (value instanceof int[]) {
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clone.value = ((int[]) value).clone();
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} else if (value instanceof long[]) {
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clone.value = ((long[]) value).clone();
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} else if (value instanceof float[]) {
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clone.value = ((float[]) value).clone();
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} else if (value instanceof double[]) {
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clone.value = ((double[]) value).clone();
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} else if (value instanceof MessageNano[]) {
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MessageNano[] valueArray = (MessageNano[]) value;
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MessageNano[] cloneArray = new MessageNano[valueArray.length];
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clone.value = cloneArray;
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for (int i = 0; i < valueArray.length; i++) {
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cloneArray[i] = valueArray[i].clone();
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}
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}
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return clone;
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} catch (CloneNotSupportedException e) {
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throw new AssertionError(e);
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}
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}
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}
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