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/*
* Copyright 2023 Code Intelligence GmbH
*
* 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.code_intelligence.jazzer.mutation.mutator.proto;
import static java.util.Collections.singletonList;
import com.google.protobuf.Descriptors.FieldDescriptor;
import com.google.protobuf.Message;
import com.google.protobuf.Message.Builder;
import java.util.AbstractList;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
final class BuilderAdapters {
private BuilderAdapters() {}
static <T extends Builder, U> List<U> makeMutableRepeatedFieldView(
T builder, FieldDescriptor field) {
return new AbstractList<U>() {
// O(1)
@Override
public U get(int index) {
return (U) builder.getRepeatedField(field, index);
}
// O(1)
@Override
public int size() {
return builder.getRepeatedFieldCount(field);
}
// O(1)
@Override
public boolean add(U element) {
builder.addRepeatedField(field, element);
return true;
}
// O(1)
@Override
public void add(int index, U element) {
addAll(index, singletonList(element));
}
// O(size() + other.size())
public boolean addAll(int index, Collection<? extends U> other) {
// This was benchmarked against the following implementation and found to be faster in all
// cases (up to 4x on lists of size 1000):
//
// for (U element : other) {
// builder.addRepeatedField(field, element);
// }
// Collections.rotate(subList(index, size()), other.size());
int otherSize = other.size();
if (otherSize == 0) {
return false;
}
int originalSize = size();
if (index == originalSize) {
for (U element : other) {
builder.addRepeatedField(field, element);
}
return true;
}
int newSize = originalSize + otherSize;
ArrayList<U> temp = new ArrayList<>(newSize);
for (int i = 0; i < index; i++) {
temp.add((U) builder.getRepeatedField(field, i));
}
temp.addAll(other);
for (int i = index; i < originalSize; i++) {
temp.add((U) builder.getRepeatedField(field, i));
}
replaceWith(temp);
return true;
}
// O(1)
@Override
public U set(int index, U element) {
U previous = get(index);
builder.setRepeatedField(field, index, element);
return previous;
}
// O(size())
@Override
public U remove(int index) {
U removed = get(index);
removeRange(index, index + 1);
return removed;
}
// O(size() - (toIndex - fromIndex))
@Override
protected void removeRange(int fromIndex, int toIndex) {
int originalSize = size();
int newSize = originalSize - (toIndex - fromIndex);
if (newSize == 0) {
builder.clearField(field);
return;
}
// There is no way to remove individual repeated field entries without clearing the entire
// field, so we have to iterate over all entries and keep them in a temporary list.
ArrayList<U> temp = new ArrayList<>(newSize);
for (int i = 0; i < fromIndex; i++) {
temp.add((U) builder.getRepeatedField(field, i));
}
for (int i = toIndex; i < originalSize; i++) {
temp.add((U) builder.getRepeatedField(field, i));
}
replaceWith(temp);
}
private void replaceWith(ArrayList<U> temp) {
builder.clearField(field);
for (U element : temp) {
builder.addRepeatedField(field, element);
}
}
};
}
static <T extends Builder, U> U getPresentFieldOrNull(T builder, FieldDescriptor field) {
if (builder.hasField(field)) {
return (U) builder.getField(field);
} else {
return null;
}
}
static <T extends Builder, U> void setFieldWithPresence(
T builder, FieldDescriptor field, U value) {
if (value == null) {
builder.clearField(field);
} else {
builder.setField(field, value);
}
}
static <T extends Builder, K, V> Map<K, V> getMapField(T builder, FieldDescriptor field) {
int size = builder.getRepeatedFieldCount(field);
FieldDescriptor keyField = field.getMessageType().getFields().get(0);
FieldDescriptor valueField = field.getMessageType().getFields().get(1);
HashMap<K, V> map = new HashMap<>(size);
for (int i = 0; i < size; i++) {
Message entry = (Message) builder.getRepeatedField(field, i);
map.put((K) entry.getField(keyField), (V) entry.getField(valueField));
}
return map;
}
static <T extends Builder, K, V> void setMapField(
Builder builder, FieldDescriptor field, Map<K, V> map) {
builder.clearField(field);
FieldDescriptor keyField = field.getMessageType().getFields().get(0);
FieldDescriptor valueField = field.getMessageType().getFields().get(1);
Builder entryBuilder = builder.newBuilderForField(field);
for (Entry<K, V> entry : map.entrySet()) {
entryBuilder.setField(keyField, entry.getKey());
entryBuilder.setField(valueField, entry.getValue());
builder.addRepeatedField(field, entryBuilder.build());
}
}
}
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