mojo/public/tools/bindings/generators/java_templates/struct_definition.tmpl

{% from "constant_definition.tmpl" import constant_def %}
{% from "enum_definition.tmpl" import enum_def %}

{%- macro array_expected_length(kind) -%}
{%- if kind|is_fixed_array_kind -%}
{{kind.length}}
{%- else -%}
org.chromium.mojo.bindings.BindingsHelper.UNSPECIFIED_ARRAY_LENGTH
{%- endif -%}
{%- endmacro -%}

{% macro encode(variable, kind, offset, bit, level=0) %}
{% if kind|is_pointer_array_kind %}
{% set sub_kind = kind.kind %}
if ({{variable}} == null) {
    encoder{{level}}.encodeNullPointer({{offset}}, {{kind|is_nullable_kind|java_true_false}});
} else {
    org.chromium.mojo.bindings.Encoder encoder{{level + 1}} = encoder{{level}}.encodePointerArray({{variable}}.length, {{offset}}, {{array_expected_length(kind)}});
    for (int i{{level}} = 0; i{{level}} < {{variable}}.length; ++i{{level}}) {
        {{encode(variable~'[i'~level~']', sub_kind, 'DataHeader.HEADER_SIZE + org.chromium.mojo.bindings.BindingsHelper.POINTER_SIZE * i'~level, 0, level+1)|indent(8)}}
    }
}
{% else %}
encoder{{level}}.{{kind|encode_method(variable, offset, bit)}};
{% endif %}
{% endmacro %}

{% macro decode(variable, kind, offset, bit, level=0) %}
{% if kind|is_struct_kind or kind|is_pointer_array_kind %}
org.chromium.mojo.bindings.Decoder decoder{{level+1}} = decoder{{level}}.readPointer({{offset}}, {{kind|is_nullable_kind|java_true_false}});
{%   if kind|is_struct_kind %}
{{variable}} = {{kind|java_type}}.decode(decoder{{level+1}});
{%   else %}{# kind|is_pointer_array_kind #}
if (decoder{{level+1}} == null) {
    {{variable}} = null;
} else {
    DataHeader si{{level+1}} = decoder{{level+1}}.readDataHeaderForPointerArray({{array_expected_length(kind)}});
    {{variable}} = {{kind|new_array('si'~(level+1)~'.numFields')}};
    for (int i{{level+1}} = 0; i{{level+1}} < si{{level+1}}.numFields; ++i{{level+1}}) {
        {{decode(variable~'[i'~(level+1)~']', kind.kind, 'DataHeader.HEADER_SIZE + org.chromium.mojo.bindings.BindingsHelper.POINTER_SIZE * i'~(level+1), 0, level+1)|indent(8)}}
    }
}
{%   endif %}
{% else %}
{{variable}} = decoder{{level}}.{{kind|decode_method(offset, bit)}};
{% endif %}
{% endmacro %}

{% macro struct_def(struct, inner_class=False) %}
{{'static' if inner_class else 'public'}} final class {{struct|name}} extends org.chromium.mojo.bindings.Struct {

    private static final int STRUCT_SIZE = {{struct.packed|struct_size}};
    private static final DataHeader DEFAULT_STRUCT_INFO = new DataHeader(STRUCT_SIZE, {{struct.packed.packed_fields|length}});
{%  for constant in struct.constants %}

    {{constant_def(constant)|indent(4)}}
{%  endfor %}
{%  for enum in struct.enums %}

    {{enum_def(enum, false)|indent(4)}}
{% endfor %}
{% if struct.fields %}

{%   for field in struct.fields %}
    public {{field.kind|java_type}} {{field|name}};
{%   endfor %}
{% endif %}

    public {{struct|name}}() {
        super(STRUCT_SIZE);
{% for field in struct.fields %}
{%   if field.default %}
        {{field|name}} = {{field|default_value}};
{%   elif field.kind|is_handle %}
        {{field|name}} = org.chromium.mojo.system.InvalidHandle.INSTANCE;
{%   endif %}
{% endfor %}
    }

    public static {{struct|name}} deserialize(org.chromium.mojo.bindings.Message message) {
        return decode(new org.chromium.mojo.bindings.Decoder(message));
    }

    public static {{struct|name}} decode(org.chromium.mojo.bindings.Decoder decoder0) {
        if (decoder0 == null) {
            return null;
        }
        {{struct|name}} result = new {{struct|name}}();
{% if not struct.bytes %}
        decoder0.readDataHeader();
{% else %}
        DataHeader mainDataHeader = decoder0.readDataHeader();
{% endif %}
{% for byte in struct.bytes %}
{%   for packed_field in byte.packed_fields %}
        if (mainDataHeader.numFields > {{packed_field.ordinal}}) {
            {{decode('result.' ~ packed_field.field|name, packed_field.field.kind, 8+packed_field.offset, packed_field.bit)|indent(12)}}
        }
{%   endfor %}
{% endfor %}
        return result;
    }

    @Override
    protected final void encode(org.chromium.mojo.bindings.Encoder encoder) {
{% if not struct.bytes %}
        encoder.getEncoderAtDataOffset(DEFAULT_STRUCT_INFO);
{% else %}
        org.chromium.mojo.bindings.Encoder encoder0 = encoder.getEncoderAtDataOffset(DEFAULT_STRUCT_INFO);
{% endif %}
{% for byte in struct.bytes %}
{%   for packed_field in byte.packed_fields %}
        {{encode(packed_field.field|name, packed_field.field.kind, 8+packed_field.offset, packed_field.bit)|indent(8)}}
{%   endfor %}
{% endfor %}
    }
}
{% endmacro %}