com.google.auto.factory.processor.Elements2.java Source code

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Here is the source code for com.google.auto.factory.processor.Elements2.java

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/*
 * Copyright (C) 2013 Google, Inc.
 *
 * 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.auto.factory.processor;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static javax.lang.model.element.ElementKind.CLASS;
import static javax.lang.model.element.ElementKind.PACKAGE;
import static javax.lang.model.element.Modifier.FINAL;
import static javax.lang.model.element.Modifier.STATIC;

import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.ExecutableType;
import javax.lang.model.type.TypeKind;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.ElementFilter;
import javax.lang.model.util.Types;

import com.google.common.collect.ImmutableSet;

final class Elements2 {
    private Elements2() {
    }

    static ImmutableSet<ExecutableElement> getConstructors(TypeElement type) {
        checkNotNull(type);
        checkArgument(type.getKind() == CLASS);
        return ImmutableSet.copyOf(ElementFilter.constructorsIn(type.getEnclosedElements()));
    }

    static boolean isValidSupertypeForClass(TypeElement type) {
        if (!type.getKind().equals(CLASS)) {
            return false;
        }
        if (type.getModifiers().contains(FINAL)) {
            return false;
        }
        if (!type.getEnclosingElement().getKind().equals(PACKAGE) && !type.getModifiers().contains(STATIC)) {
            return false;
        }
        if (type.getSimpleName().length() == 0) {
            return false;
        }
        return true;
    }

    /**
     * Given an executable element in a supertype, returns its ExecutableType when it is viewed as a
     * member of a subtype.
     */
    static ExecutableType getExecutableElementAsMemberOf(Types types, ExecutableElement executableElement,
            TypeElement subTypeElement) {
        checkNotNull(types);
        checkNotNull(executableElement);
        checkNotNull(subTypeElement);
        TypeMirror subTypeMirror = subTypeElement.asType();
        if (!subTypeMirror.getKind().equals(TypeKind.DECLARED)) {
            throw new IllegalStateException("Expected subTypeElement.asType() to return a class/interface type.");
        }
        TypeMirror subExecutableTypeMirror = types.asMemberOf((DeclaredType) subTypeMirror, executableElement);
        if (!subExecutableTypeMirror.getKind().equals(TypeKind.EXECUTABLE)) {
            throw new IllegalStateException("Expected subExecutableTypeMirror to be an executable type.");
        }
        return (ExecutableType) subExecutableTypeMirror;
    }
}