com.google.errorprone.refaster.UBlock.java Source code

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Here is the source code for com.google.errorprone.refaster.UBlock.java

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/*
 * Copyright 2013 Google Inc. All rights reserved.
 *
 * 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.errorprone.refaster;

import com.google.auto.value.AutoValue;
import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;
import com.sun.source.tree.BlockTree;
import com.sun.source.tree.StatementTree;
import com.sun.source.tree.TreeVisitor;
import com.sun.tools.javac.tree.JCTree.JCBlock;
import com.sun.tools.javac.tree.JCTree.JCStatement;
import com.sun.tools.javac.util.ListBuffer;
import java.util.List;

/**
 * {@link UTree} representation of a {@link BlockTree}.
 *
 * @author lowasser@google.com (Louis Wasserman)
 */
@AutoValue
abstract class UBlock extends USimpleStatement implements BlockTree {
    public static UBlock create(List<UStatement> statements) {
        return new AutoValue_UBlock(ImmutableList.copyOf(statements));
    }

    public static UBlock create(UStatement... statements) {
        return create(ImmutableList.copyOf(statements));
    }

    @Override
    public abstract List<UStatement> getStatements();

    static Choice<Unifier> unifyStatementList(Iterable<? extends UStatement> statements,
            Iterable<? extends StatementTree> targets, Unifier unifier) {
        Choice<UnifierWithUnconsumedStatements> choice = Choice
                .of(UnifierWithUnconsumedStatements.create(unifier, ImmutableList.copyOf(targets)));
        for (UStatement statement : statements) {
            choice = choice.thenChoose(statement);
        }
        return choice.thenOption(new Function<UnifierWithUnconsumedStatements, Optional<Unifier>>() {
            @Override
            public Optional<Unifier> apply(UnifierWithUnconsumedStatements state) {
                return state.unconsumedStatements().isEmpty() ? Optional.of(state.unifier())
                        : Optional.<Unifier>absent();
            }
        });
    }

    static com.sun.tools.javac.util.List<JCStatement> inlineStatementList(Iterable<? extends UStatement> statements,
            Inliner inliner) throws CouldNotResolveImportException {
        ListBuffer<JCStatement> buffer = new ListBuffer<>();
        for (UStatement statement : statements) {
            buffer.appendList(statement.inlineStatements(inliner));
        }
        return buffer.toList();
    }

    @Override
    public Choice<Unifier> visitBlock(BlockTree block, Unifier unifier) {
        return unifyStatementList(getStatements(), block.getStatements(), unifier);
    }

    @Override
    public JCBlock inline(Inliner inliner) throws CouldNotResolveImportException {
        return inliner.maker().Block(0, inlineStatementList(getStatements(), inliner));
    }

    @Override
    public Kind getKind() {
        return Kind.BLOCK;
    }

    @Override
    public <R, D> R accept(TreeVisitor<R, D> visitor, D data) {
        return visitor.visitBlock(this, data);
    }

    @Override
    public boolean isStatic() {
        return false;
    }
}