ProtoList.java
package net.morimekta.proto;
import com.google.protobuf.Descriptors;
import com.google.protobuf.MessageOrBuilder;
import net.morimekta.proto.utils.ValueUtil;
import java.util.AbstractList;
import java.util.RandomAccess;
import static java.util.Objects.requireNonNull;
/**
* A list wrapping a repeated proto field. This is an unmodifiable list.
*
* @param <T> The item type.
*/
public class ProtoList<T>
extends AbstractList<T>
implements RandomAccess {
private transient final MessageOrBuilder message;
private transient final Descriptors.FieldDescriptor field;
/**
* @param message Message the field is on.
* @param field The repeated field.
*/
public ProtoList(MessageOrBuilder message, Descriptors.FieldDescriptor field) {
requireNonNull(message, "message == null");
requireNonNull(field, "field == null");
if (!field.isRepeated() || field.isMapField()) {
throw new IllegalArgumentException("Not a list type: " + field);
}
this.message = message;
this.field = field;
}
@Override
public int size() {
return message.getRepeatedFieldCount(field);
}
@Override
@SuppressWarnings("unchecked")
public T get(int i) {
return (T) ValueUtil.toJavaValue(field, message.getRepeatedField(field, i));
}
@Override
public String toString() {
return ValueUtil.asString(this);
}
}