dagger.internal.codegen.writing.MemberSelect Maven / Gradle / Ivy
/*
* Copyright (C) 2015 The Dagger Authors.
*
* 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 dagger.internal.codegen.writing;
import static com.google.common.base.Preconditions.checkNotNull;
import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.CodeBlock;
import dagger.internal.codegen.writing.ComponentImplementation.ShardImplementation;
/**
* Represents a {@link com.sun.source.tree.MemberSelectTree} as a {@link CodeBlock}.
*/
abstract class MemberSelect {
/**
* Returns a {@link MemberSelect} that accesses the field given by {@code fieldName} owned by
* {@code owningClass}. In this context "local" refers to the fact that the field is owned by the
* type (or an enclosing type) from which the code block will be used. The returned {@link
* MemberSelect} will not be valid for accessing the field from a different class (regardless of
* accessibility).
*/
static MemberSelect localField(ShardImplementation owningShard, String fieldName) {
return new LocalField(owningShard, fieldName);
}
private static final class LocalField extends MemberSelect {
final ShardImplementation owningShard;
final String fieldName;
LocalField(ShardImplementation owningShard, String fieldName) {
super(owningShard.name(), false);
this.owningShard = owningShard;
this.fieldName = checkNotNull(fieldName);
}
@Override
CodeBlock getExpressionFor(ClassName usingClass) {
return owningClass().equals(usingClass)
? CodeBlock.of("$N", fieldName)
: CodeBlock.of("$L.$N", owningShard.shardFieldReference(), fieldName);
}
}
private final ClassName owningClass;
private final boolean staticMember;
MemberSelect(ClassName owningClass, boolean staticMemeber) {
this.owningClass = owningClass;
this.staticMember = staticMemeber;
}
/** Returns the class that owns the member being selected. */
ClassName owningClass() {
return owningClass;
}
/**
* Returns true if the member being selected is static and does not require an instance of
* {@link #owningClass()}.
*/
boolean staticMember() {
return staticMember;
}
/**
* Returns a {@link CodeBlock} suitable for accessing the member from the given {@code
* usingClass}.
*/
abstract CodeBlock getExpressionFor(ClassName usingClass);
}