I created a Java program, which needs to be able to update fields in nested
Messages.
The problem is that if I have a Message.Builder and within this builder I
have a repeated Message, I cannot find a general method in the GPB
libraries to change this into a Builder which is automatically part of the
parent builder.
I solved this with the following code:
private Message.Builder createRepeatedBuilder(Message.Builder builder,
FieldDescriptor fieldDescriptor)
{
// Unfortunately I cannot find any general method to create a
builder for a repeated message.
// Therefore I use reflection myself by using the field name and
convert it to add<name>Builder.
// E.g. add MergeElementsBuilder
String name = fieldDescriptor.getName();
if (name.contains("_"))
{
name = name.substring(0, 1).toUpperCase() + name.substring(1);
}
while (name.contains("_"))
{
name = name.substring(0, name.indexOf("_")) +
name.substring(name.indexOf("_") + 1, name.indexOf("_") +
2).toUpperCase() +
name.substring(name.indexOf("_") + 2);
}
name = "add" + name + "Builder";
// propertiesBuilder = ((DataObjectMerge.Builder)
mainBuilder).addMergeElementsBuilder(0);
// Reflection
try
{
if (parent == null)
{
Method method = mainBuilder.getClass().getMethod(name);
return (Message.Builder) method.invoke(mainBuilder);
}
else
{
Method method = builder.getClass().getMethod(name);
return (Message.Builder) method.invoke(builder);
}
}
catch (IllegalAccessException e)
{
e.printStackTrace();
}
catch (IllegalArgumentException e)
{
e.printStackTrace();
}
catch (InvocationTargetException e)
{
e.printStackTrace();
}
catch (NoSuchMethodException | SecurityException e)
{
e.printStackTrace();
}
return null;
}
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