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Enforce logging best practices and migrate between logging frameworks. Automatically.

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/*
 * Copyright 2021 the original author or 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
 * 

 * https://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 org.openrewrite.java.security.internal;

import lombok.AccessLevel;
import lombok.NoArgsConstructor;
import org.openrewrite.Cursor;
import org.openrewrite.java.tree.J;

import java.util.Iterator;
import java.util.Optional;

@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class CursorUtil {
    /**
     * Find the outermost executable {@link J.Block} that is an executable set of instructions.
     * This is one of the following:
     * 

     *     A {@link J.Block} that is either static or an init block.
     *     The block held by a {@link J.MethodInvocation}.
     * 
     */
    public static Optional findOuterExecutableBlock(Cursor start) {
        Iterator path = start.getPathAsCursors();
        Cursor parent = path.next();
        while (path.hasNext()) {
            Cursor cursor = path.next();
            if (cursor.getValue() instanceof J.MethodDeclaration) {
                assert parent.getValue() instanceof J.Block : "Parent of method declaration is not a block. Was: " + parent.getValue();
                return Optional.of(parent);
            }
            if (cursor.getValue() instanceof J.Block && J.Block.isStaticOrInitBlock(cursor)) {
                return Optional.of(cursor);
            }
            parent = cursor;
        }
        return Optional.empty();
    }

    public static Cursor findOuterExecutableBlockOrThrow(Cursor start) {
        return findOuterExecutableBlock(start)
                .orElseThrow(() -> new IllegalStateException("Could not find outer executable block"));
    }
}