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DefaultValueComposer.java
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DefaultValueComposer.java
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// Copyright 2020 Google LLC
//
// 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.google.api.generator.gapic.composer.defaultvalue;
import com.google.api.generator.engine.ast.ConcreteReference;
import com.google.api.generator.engine.ast.Expr;
import com.google.api.generator.engine.ast.MethodInvocationExpr;
import com.google.api.generator.engine.ast.NewObjectExpr;
import com.google.api.generator.engine.ast.PrimitiveValue;
import com.google.api.generator.engine.ast.StringObjectValue;
import com.google.api.generator.engine.ast.TypeNode;
import com.google.api.generator.engine.ast.ValueExpr;
import com.google.api.generator.engine.ast.Variable;
import com.google.api.generator.engine.ast.VariableExpr;
import com.google.api.generator.gapic.composer.resourcename.ResourceNameTokenizer;
import com.google.api.generator.gapic.model.Field;
import com.google.api.generator.gapic.model.Message;
import com.google.api.generator.gapic.model.MethodArgument;
import com.google.api.generator.gapic.model.ResourceName;
import com.google.api.generator.gapic.utils.JavaStyle;
import com.google.api.generator.gapic.utils.ResourceNameConstants;
import com.google.common.base.Preconditions;
import com.google.longrunning.Operation;
import com.google.protobuf.Any;
import com.google.protobuf.ByteString;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
public class DefaultValueComposer {
private static TypeNode OPERATION_TYPE =
TypeNode.withReference(ConcreteReference.withClazz(Operation.class));
private static TypeNode ANY_TYPE = TypeNode.withReference(ConcreteReference.withClazz(Any.class));
private static TypeNode BYTESTRING_TYPE =
TypeNode.withReference(ConcreteReference.withClazz(ByteString.class));
public static Expr createDefaultValue(
MethodArgument methodArg, Map<String, ResourceName> resourceNames) {
if (methodArg.isResourceNameHelper()) {
Preconditions.checkState(
methodArg.field().hasResourceReference(),
String.format(
"No corresponding resource reference for argument %s found on field %s %s",
methodArg.name(), methodArg.field().type(), methodArg.field().name()));
ResourceName resourceName =
resourceNames.get(methodArg.field().resourceReference().resourceTypeString());
Preconditions.checkNotNull(
resourceName,
String.format(
"No resource name found for reference %s",
methodArg.field().resourceReference().resourceTypeString()));
return createDefaultValue(
resourceName,
resourceNames.values().stream().collect(Collectors.toList()),
methodArg.field().name());
}
if (methodArg.type().equals(methodArg.field().type())) {
return createDefaultValue(methodArg.field());
}
return createDefaultValue(
Field.builder().setName(methodArg.name()).setType(methodArg.type()).build());
}
public static Expr createDefaultValue(Field f) {
return createDefaultValue(f, false);
}
static Expr createDefaultValue(Field f, boolean useExplicitInitTypeInGenerics) {
if (f.isRepeated()) {
ConcreteReference.Builder refBuilder =
ConcreteReference.builder().setClazz(f.isMap() ? HashMap.class : ArrayList.class);
if (useExplicitInitTypeInGenerics) {
if (f.isMap()) {
refBuilder = refBuilder.setGenerics(f.type().reference().generics().subList(0, 2));
} else {
refBuilder = refBuilder.setGenerics(f.type().reference().generics().get(0));
}
}
TypeNode newType = TypeNode.withReference(refBuilder.build());
return NewObjectExpr.builder().setType(newType).setIsGeneric(true).build();
}
if (f.isEnum()) {
return MethodInvocationExpr.builder()
.setStaticReferenceType(f.type())
.setMethodName("forNumber")
.setArguments(
ValueExpr.withValue(
PrimitiveValue.builder().setType(TypeNode.INT).setValue("0").build()))
.setReturnType(f.type())
.build();
}
if (f.isMessage()) {
MethodInvocationExpr newBuilderExpr =
MethodInvocationExpr.builder()
.setStaticReferenceType(f.type())
.setMethodName("newBuilder")
.build();
return MethodInvocationExpr.builder()
.setExprReferenceExpr(newBuilderExpr)
.setMethodName("build")
.setReturnType(f.type())
.build();
}
if (f.type().equals(TypeNode.STRING)) {
String javaFieldName = JavaStyle.toLowerCamelCase(f.name());
return ValueExpr.withValue(
StringObjectValue.withValue(
String.format("%s%s", javaFieldName, javaFieldName.hashCode())));
}
if (TypeNode.isNumericType(f.type())) {
return ValueExpr.withValue(
PrimitiveValue.builder()
.setType(f.type())
.setValue(String.format("%s", f.name().hashCode()))
.build());
}
if (f.type().equals(TypeNode.BOOLEAN)) {
return ValueExpr.withValue(
PrimitiveValue.builder().setType(f.type()).setValue("true").build());
}
if (f.type().equals(TypeNode.BYTESTRING)) {
return VariableExpr.builder()
.setStaticReferenceType(TypeNode.BYTESTRING)
.setVariable(Variable.builder().setName("EMPTY").setType(TypeNode.BYTESTRING).build())
.build();
}
throw new UnsupportedOperationException(
String.format(
"Default value for field %s with type %s not implemented yet.", f.name(), f.type()));
}
public static Expr createDefaultValue(
ResourceName resourceName, List<ResourceName> resnames, String fieldOrMessageName) {
boolean hasOnePattern = resourceName.patterns().size() == 1;
if (resourceName.isOnlyWildcard()) {
List<ResourceName> unexaminedResnames = new ArrayList<>(resnames);
for (ResourceName resname : resnames) {
if (resname.isOnlyWildcard()) {
unexaminedResnames.remove(resname);
continue;
}
unexaminedResnames.remove(resname);
return createDefaultValue(resname, unexaminedResnames, fieldOrMessageName);
}
if (unexaminedResnames.isEmpty()) {
return ValueExpr.withValue(
StringObjectValue.withValue(
String.format("%s%s", fieldOrMessageName, fieldOrMessageName.hashCode())));
}
}
// The cost tradeoffs of new ctors versus distinct() don't really matter here, since this list
// will usually have a very small number of elements.
List<String> patterns = new ArrayList<>(new HashSet<>(resourceName.patterns()));
boolean containsOnlyDeletedTopic =
patterns.size() == 1 && patterns.get(0).equals(ResourceNameConstants.DELETED_TOPIC_LITERAL);
String ofMethodName = "of";
List<String> patternPlaceholderTokens = new ArrayList<>();
if (containsOnlyDeletedTopic) {
ofMethodName = "ofDeletedTopic";
} else {
for (String pattern : resourceName.patterns()) {
if (pattern.equals(ResourceNameConstants.WILDCARD_PATTERN)
|| pattern.equals(ResourceNameConstants.DELETED_TOPIC_LITERAL)) {
continue;
}
patternPlaceholderTokens.addAll(
ResourceNameTokenizer.parseTokenHierarchy(Arrays.asList(pattern)).get(0));
break;
}
}
if (!hasOnePattern) {
ofMethodName =
String.format(
"of%sName",
String.join(
"",
patternPlaceholderTokens.stream()
.map(s -> JavaStyle.toUpperCamelCase(s))
.collect(Collectors.toList())));
}
TypeNode resourceNameJavaType = resourceName.type();
List<Expr> argExprs =
patternPlaceholderTokens.stream()
.map(
s ->
ValueExpr.withValue(
StringObjectValue.withValue(String.format("[%s]", s.toUpperCase()))))
.collect(Collectors.toList());
return MethodInvocationExpr.builder()
.setStaticReferenceType(resourceNameJavaType)
.setMethodName(ofMethodName)
.setArguments(argExprs)
.setReturnType(resourceNameJavaType)
.build();
}
public static Expr createSimpleMessageBuilderExpr(
Message message, Map<String, ResourceName> resourceNames, Map<String, Message> messageTypes) {
MethodInvocationExpr builderExpr =
MethodInvocationExpr.builder()
.setStaticReferenceType(message.type())
.setMethodName("newBuilder")
.build();
for (Field field : message.fields()) {
if (field.isContainedInOneof() // Avoid colliding fields.
|| ((field.isMessage() || field.isEnum()) // Avoid importing unparsed messages.
&& !field.isRepeated()
&& !messageTypes.containsKey(field.type().reference().fullName()))) {
continue;
}
String setterMethodNamePattern = "set%s";
if (field.isRepeated()) {
setterMethodNamePattern = field.isMap() ? "putAll%s" : "addAll%s";
}
Expr defaultExpr = null;
if (field.hasResourceReference()
&& resourceNames.get(field.resourceReference().resourceTypeString()) != null) {
defaultExpr =
createDefaultValue(
resourceNames.get(field.resourceReference().resourceTypeString()),
resourceNames.values().stream().collect(Collectors.toList()),
message.name());
defaultExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(defaultExpr)
.setMethodName("toString")
.setReturnType(TypeNode.STRING)
.build();
} else {
defaultExpr = createDefaultValue(field, true);
}
builderExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(builderExpr)
.setMethodName(
String.format(setterMethodNamePattern, JavaStyle.toUpperCamelCase(field.name())))
.setArguments(defaultExpr)
.build();
}
return MethodInvocationExpr.builder()
.setExprReferenceExpr(builderExpr)
.setMethodName("build")
.setReturnType(message.type())
.build();
}
public static Expr createSimpleOperationBuilderExpr(String name, VariableExpr responseExpr) {
Expr operationExpr =
MethodInvocationExpr.builder()
.setStaticReferenceType(OPERATION_TYPE)
.setMethodName("newBuilder")
.build();
operationExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(operationExpr)
.setMethodName("setName")
.setArguments(ValueExpr.withValue(StringObjectValue.withValue(name)))
.build();
operationExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(operationExpr)
.setMethodName("setDone")
.setArguments(
ValueExpr.withValue(
PrimitiveValue.builder().setType(TypeNode.BOOLEAN).setValue("true").build()))
.build();
operationExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(operationExpr)
.setMethodName("setResponse")
.setArguments(
MethodInvocationExpr.builder()
.setStaticReferenceType(ANY_TYPE)
.setMethodName("pack")
.setArguments(responseExpr)
.build())
.build();
return MethodInvocationExpr.builder()
.setExprReferenceExpr(operationExpr)
.setMethodName("build")
.setReturnType(OPERATION_TYPE)
.build();
}
public static Expr createSimplePagedResponse(
TypeNode responseType, String repeatedFieldName, Expr responseElementVarExpr) {
Expr pagedResponseExpr =
MethodInvocationExpr.builder()
.setStaticReferenceType(responseType)
.setMethodName("newBuilder")
.build();
pagedResponseExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(pagedResponseExpr)
.setMethodName("setNextPageToken")
.setArguments(ValueExpr.withValue(StringObjectValue.withValue("")))
.build();
pagedResponseExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(pagedResponseExpr)
.setMethodName(String.format("addAll%s", JavaStyle.toUpperCamelCase(repeatedFieldName)))
.setArguments(
MethodInvocationExpr.builder()
.setStaticReferenceType(
TypeNode.withReference(ConcreteReference.withClazz(Arrays.class)))
.setMethodName("asList")
.setArguments(responseElementVarExpr)
.build())
.build();
return MethodInvocationExpr.builder()
.setExprReferenceExpr(pagedResponseExpr)
.setMethodName("build")
.setReturnType(responseType)
.build();
}
}