Class SQLObjectImpl

core/src/main/java/com/alibaba/druid/sql/ast/SQLObjectImpl.java:31–314

import java.util.Map;

public abstract class SQLObjectImpl implements SQLObject {
    protected SQLObject parent;
    protected Map<String, Object> attributes;
    protected SQLCommentHint hint;

    protected int sourceLine;
    protected int sourceColumn;

    public SQLObjectImpl() {
    }

    protected void cloneTo(SQLObjectImpl x) {
        x.parent = this.parent;
        if (this.attributes != null) {
            x.attributes = new HashMap<>(attributes);
        }
        x.sourceLine = this.sourceLine;
        x.sourceColumn = this.sourceColumn;
    }

    public final void accept(SQLASTVisitor visitor) {
        if (visitor == null) {
            throw new IllegalArgumentException();
        }

        visitor.preVisit(this);

        accept0(visitor);

        visitor.postVisit(this);
    }

    protected abstract void accept0(SQLASTVisitor v);

    protected final void acceptChild(SQLASTVisitor visitor, List<? extends SQLObject> children) {
        if (children == null) {
            return;
        }

        for (int i = 0; i < children.size(); i++) {
            acceptChild(visitor, children.get(i));
        }
    }

    protected final void acceptChild(SQLASTVisitor visitor, SQLObject child) {
        if (child == null) {
            return;
        }

        child.accept(visitor);
    }

    public void output(StringBuilder buf) {
        DbType dbType = null;
        if (this instanceof OracleSQLObject) {
            dbType = DbType.oracle;
        } else if (this instanceof MySqlObject) {
            dbType = DbType.mysql;