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The Checker Framework enhances Java's type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.
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package org.checkerframework.javacutil.trees;

import com.sun.source.tree.BinaryTree;
import com.sun.source.tree.ClassTree;
import com.sun.source.tree.CompoundAssignmentTree;
import com.sun.source.tree.IdentifierTree;
import com.sun.source.tree.LambdaExpressionTree;
import com.sun.source.tree.MemberReferenceTree;
import com.sun.source.tree.MemberSelectTree;
import com.sun.source.tree.MethodInvocationTree;
import com.sun.source.tree.MethodTree;
import com.sun.source.tree.NewClassTree;
import com.sun.source.tree.Tree;
import com.sun.source.tree.TryTree;
import com.sun.source.tree.UnaryTree;
import com.sun.source.tree.VariableTree;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.JCTree.JCAssignOp;
import com.sun.tools.javac.tree.JCTree.JCBinary;
import com.sun.tools.javac.tree.JCTree.JCClassDecl;
import com.sun.tools.javac.tree.JCTree.JCFieldAccess;
import com.sun.tools.javac.tree.JCTree.JCIdent;
import com.sun.tools.javac.tree.JCTree.JCLambda;
import com.sun.tools.javac.tree.JCTree.JCMemberReference;
import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
import com.sun.tools.javac.tree.JCTree.JCMethodInvocation;
import com.sun.tools.javac.tree.JCTree.JCNewClass;
import com.sun.tools.javac.tree.JCTree.JCTry;
import com.sun.tools.javac.tree.JCTree.JCUnary;
import com.sun.tools.javac.tree.JCTree.JCVariableDecl;
import com.sun.tools.javac.tree.TreeCopier;
import com.sun.tools.javac.tree.TreeMaker;

/**
 * A Utility class for coping AST {@link JCTree} fully, including type and symbol information. This
 * class is a helper class and used only in {@link TreeBuilder#copy(Tree)}.
 *
 * @see TreeBuilder#copy(Tree)
 */
class FullyTreeCopier extends TreeCopier {

    /* package private */ FullyTreeCopier(TreeMaker treeMaker) {
        super(treeMaker);
    }

    @Override
    public  T copy(T tree, Void p) {
        T t = super.copy(tree, p);
        if (t == null) {
            return null;
        }

        t.type = tree.type;
        return t;
    }

    @Override
    public JCTree visitCompoundAssignment(CompoundAssignmentTree node, Void p) {
        JCAssignOp t = (JCAssignOp) super.visitCompoundAssignment(node, p);
        t.operator = ((JCAssignOp) node).operator;
        return t;
    }

    @Override
    public JCTree visitBinary(BinaryTree node, Void p) {
        JCBinary t = (JCBinary) super.visitBinary(node, p);
        t.operator = ((JCBinary) node).operator;
        return t;
    }

    @Override
    public JCTree visitClass(ClassTree node, Void p) {
        JCClassDecl t = (JCClassDecl) super.visitClass(node, p);
        t.sym = ((JCClassDecl) node).sym;
        return t;
    }

    @Override
    public JCTree visitIdentifier(IdentifierTree node, Void p) {
        JCIdent t = (JCIdent) super.visitIdentifier(node, p);
        t.sym = ((JCIdent) node).sym;
        return t;
    }

    @Override
    public JCTree visitMethod(MethodTree node, Void p) {
        JCMethodDecl t = (JCMethodDecl) super.visitMethod(node, p);
        t.sym = ((JCMethodDecl) node).sym;
        return t;
    }

    @Override
    public JCTree visitMethodInvocation(MethodInvocationTree node, Void p) {
        JCMethodInvocation t = (JCMethodInvocation) super.visitMethodInvocation(node, p);
        t.varargsElement = ((JCMethodInvocation) node).varargsElement;
        return t;
    }

    @Override
    public JCTree visitNewClass(NewClassTree node, Void p) {
        JCNewClass t = (JCNewClass) super.visitNewClass(node, p);
        t.constructor = ((JCNewClass) node).constructor;
        t.constructorType = ((JCNewClass) node).constructorType;
        t.varargsElement = ((JCNewClass) node).varargsElement;
        return t;
    }

    @Override
    public JCTree visitLambdaExpression(LambdaExpressionTree node, Void p) {
        JCLambda t = (JCLambda) super.visitLambdaExpression(node, p);
        t.canCompleteNormally = ((JCLambda) node).canCompleteNormally;
        return t;
    }

    @Override
    public JCTree visitMemberSelect(MemberSelectTree node, Void p) {
        JCFieldAccess t = (JCFieldAccess) super.visitMemberSelect(node, p);
        t.sym = ((JCFieldAccess) node).sym;
        return t;
    }

    @Override
    public JCTree visitMemberReference(MemberReferenceTree node, Void p) {
        JCMemberReference t = (JCMemberReference) super.visitMemberReference(node, p);
        t.kind = ((JCMemberReference) node).kind;
        t.sym = ((JCMemberReference) node).sym;
        t.varargsElement = ((JCMemberReference) node).varargsElement;
        t.refPolyKind = ((JCMemberReference) node).refPolyKind;
        t.ownerAccessible = ((JCMemberReference) node).ownerAccessible;
        t.overloadKind = ((JCMemberReference) node).overloadKind;
        return t;
    }

    @Override
    public JCTree visitTry(TryTree node, Void p) {
        JCTry t = (JCTry) super.visitTry(node, p);
        t.finallyCanCompleteNormally = ((JCTry) node).finallyCanCompleteNormally;
        return t;
    }

    @Override
    public JCTree visitUnary(UnaryTree node, Void p) {
        JCUnary t = (JCUnary) super.visitUnary(node, p);
        t.operator = ((JCUnary) node).operator;
        return t;
    }

    @Override
    public JCTree visitVariable(VariableTree node, Void p) {
        JCVariableDecl t = (JCVariableDecl) super.visitVariable(node, p);
        t.sym = ((JCVariableDecl) node).sym;
        return t;
    }
}