Java: Implements union generation.

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 inequality(kind, v1, v2) -%}
-{%-   if kind|is_reference_kind -%}
-{%-     if kind|is_array_kind -%}
-{%-       if kind.kind|is_reference_kind -%}
-!java.util.Arrays.deepEquals({{v1}}, {{v2}})
-{%-       else -%}
-!java.util.Arrays.equals({{v1}}, {{v2}})
-{%-       endif -%}
-{%-     else -%}
-!org.chromium.mojo.bindings.BindingsHelper.equals({{v1}}, {{v2}})
-{%-     endif -%}
-{%-   else -%}
-{{v1}} != {{v2}}
-{%-   endif -%}
-{%- endmacro -%}
-
-{%- macro hash(kind, v) -%}
-{%-   if kind|is_array_kind -%}
-{%-     if kind.kind|is_reference_kind -%}
-java.util.Arrays.deepHashCode({{v}})
-{%-     else -%}
-java.util.Arrays.hashCode({{v}})
-{%-     endif -%}
-{%-   else -%}
-org.chromium.mojo.bindings.BindingsHelper.hashCode({{v}})
-{%-   endif -%}
-{%- endmacro -%}
-
-{% macro encode(variable, kind, offset, bit, level=0, check_for_null=True) %}
-{% if kind|is_pointer_array_kind %}
-{% set sub_kind = kind.kind %}
-{%   if check_for_null %}
-if ({{variable}} == null) {
-    encoder{{level}}.encodeNullPointer({{offset}}, {{kind|is_nullable_kind|java_true_false}});
-} else {
-{%   else %}
-{
-{%   endif %}
-    org.chromium.mojo.bindings.Encoder encoder{{level + 1}} = encoder{{level}}.encodePointerArray({{variable}}.length, {{offset}}, {{kind|array_expected_length}});
-    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)}}
-    }
-}
-{% elif kind|is_map_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}}.encoderForMap({{offset}});
-    int size{{level}} = {{variable}}.size();
-    {{kind.key_kind|java_type}}[] keys{{level}} = {{kind.key_kind|array|new_array('size'~level)}};
-    {{kind.value_kind|java_type}}[] values{{level}} = {{kind.value_kind|array|new_array('size'~level)}};
-    int index{{level}} = 0;
-    for (java.util.Map.Entry<{{kind.key_kind|java_type(true)}}, {{kind.value_kind|java_type(true)}}> entry{{level}} : {{variable}}.entrySet()) {
-        keys{{level}}[index{{level}}] = entry{{level}}.getKey();
-        values{{level}}[index{{level}}] = entry{{level}}.getValue();
-        ++index{{level}};
-    }
-    {{encode('keys'~level, kind.key_kind|array, 'DataHeader.HEADER_SIZE', 0, level+1, False)|indent(4)}}
-    {{encode('values'~level, kind.value_kind|array, 'DataHeader.HEADER_SIZE + org.chromium.mojo.bindings.BindingsHelper.POINTER_SIZE', 0, level+1, False)|indent(4)}}
-}
-{% 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 or
-      kind|is_map_kind or
-      kind|is_union_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 or kind|is_union_kind %}
-{{variable}} = {{kind|java_type}}.decode(decoder{{level+1}});
-{%   else %}{# kind|is_pointer_array_kind or is_map_kind #}
-{%     if kind|is_nullable_kind %}
-if (decoder{{level+1}} == null) {
-    {{variable}} = null;
-} else {
-{%     else %}
-{
-{%     endif %}
-{%     if kind|is_map_kind %}
-    decoder{{level+1}}.readDataHeaderForMap();
-    {{kind.key_kind|java_type}}[] keys{{level}};
-    {{kind.value_kind|java_type}}[] values{{level}};
-    {
-        {{decode('keys'~level, kind.key_kind|array, 'DataHeader.HEADER_SIZE', 0, level+1)|indent(8)}}
-    }
-    {
-        {{decode('values'~level, kind.value_kind|array('keys'~level~'.length'), 'DataHeader.HEADER_SIZE + org.chromium.mojo.bindings.BindingsHelper.POINTER_SIZE', 0, level+1)|indent(8)}}
-    }
-    {{variable}} = new java.util.HashMap<{{kind.key_kind|java_type(true)}}, {{kind.value_kind|java_type(true)}}>();
-    for (int index{{level}} = 0; index{{level}} < keys{{level}}.length; ++index{{level}}) {
-        {{variable}}.put(keys{{level}}[index{{level}}],  values{{level}}[index{{level}}]);
-    }
-{%     else %}
-    DataHeader si{{level+1}} = decoder{{level+1}}.readDataHeaderForPointerArray({{kind|array_expected_length}});
-    {{variable}} = {{kind|new_array('si'~(level+1)~'.elementsOrVersion')}};
-    for (int i{{level+1}} = 0; i{{level+1}} < si{{level+1}}.elementsOrVersion; ++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 %}
-}
-{%   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.versions[-1].num_bytes}};
-    private static final DataHeader[] VERSION_ARRAY = new DataHeader[] {
-{%-   for version in struct.versions -%}
-        new DataHeader({{version.num_bytes}}, {{version.version}}){% if not loop.last %}, {% endif -%}
-{%-   endfor -%}
-    };
-    private static final DataHeader DEFAULT_STRUCT_INFO = VERSION_ARRAY[{{struct.versions|length - 1}}];
-{%  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 %}
-
-    private {{struct|name}}(int version) {
-        super(STRUCT_SIZE, version);
-{% for field in struct.fields %}
-{%   if field.default %}
-        {{field|name}} = {{field|default_value}};
-{%   elif field.kind|is_any_handle_kind and not field.kind|is_interface_request_kind %}
-        {{field|name}} = org.chromium.mojo.system.InvalidHandle.INSTANCE;
-{%   endif %}
-{% endfor %}
-    }
-
-    public {{struct|name}}() {
-        this({{struct.versions[-1].version}});
-    }
-
-    public static {{struct|name}} deserialize(org.chromium.mojo.bindings.Message message) {
-        return decode(new org.chromium.mojo.bindings.Decoder(message));
-    }
-
-    @SuppressWarnings("unchecked")
-    public static {{struct|name}} decode(org.chromium.mojo.bindings.Decoder decoder0) {
-        if (decoder0 == null) {
-            return null;
-        }
-        DataHeader mainDataHeader = decoder0.readAndValidateDataHeader(VERSION_ARRAY);
-        {{struct|name}} result = new {{struct|name}}(mainDataHeader.elementsOrVersion);
-{% for byte in struct.bytes %}
-{%   for packed_field in byte.packed_fields %}
-        if (mainDataHeader.elementsOrVersion >= {{packed_field.min_version}}) {
-            {{decode('result.' ~ packed_field.field|name, packed_field.field.kind, 8+packed_field.offset, packed_field.bit)|indent(12)}}
-        }
-{%   endfor %}
-{% endfor %}
-        return result;
-    }
-
-    @SuppressWarnings("unchecked")
-    @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 %}
-    }
-
-    /**
-     * @see Object#equals(Object)
-     */
-    @Override
-    public boolean equals(Object object) {
-        if (object == this)
-            return true;
-        if (object == null)
-            return false;
-        if (getClass() != object.getClass())
-            return false;
-{% if struct.fields|length %}
-        {{struct|name}} other = ({{struct|name}}) object;
-{%   for field in struct.fields %}
-        if ({{inequality(field.kind, field|name, 'other.'~field|name)}})
-            return false;
-{%   endfor %}
-{% endif %}
-        return true;
-    }
-
-    /**
-     * @see Object#hashCode()
-     */
-    @Override
-    public int hashCode() {
-        final int prime = 31;
-        int result = prime + getClass().hashCode();
-{% for field in struct.fields %}
-        result = prime * result + {{hash(field.kind, field|name)}};
-{% endfor %}
-        return result;
-    }
-}
-{% endmacro %}