content: /*
   * Copyright 1999-2017 Alibaba Group Holding Ltd.
   *
   * 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.alibaba.druid.sql.ast;
  
  import com.alibaba.druid.DbType;
  import com.alibaba.druid.sql.SQLUtils;
  import com.alibaba.druid.sql.dialect.mysql.ast.MySqlObject;
  import com.alibaba.druid.sql.dialect.oracle.ast.OracleSQLObject;
  import com.alibaba.druid.sql.dialect.postgresql.ast.PGSQLObject;
  import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerObject;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  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;
          } else if (this instanceof PGSQLObject) {
              dbType = DbType.postgresql;
          } else if (this instanceof SQLServerObject) {
              dbType = DbType.sqlserver;
          } else if (this instanceof SQLDbTypedObject) {
              dbType = ((SQLDbTypedObject) this).getDbType();
          }
  
          accept(
                  SQLUtils.createOutputVisitor(buf, dbType)
          );
      }
  
      public String toString() {
          StringBuilder buf = new StringBuilder();
          output(buf);
          return buf.toString();
      }
  
      public SQLObject getParent() {
          return parent;
      }
      public SQLObject getParent(int level) {
          if (level <= 0) {
              throw new IllegalArgumentException("Get parent level should be greater than 0.");
          }
          SQLObject parent = this;
          while (level-- > 0) {
              if (parent == null) {
                  return null;
              }
              parent = parent.getParent();
          }
          return parent;
      }
  
      public void setParent(SQLObject parent) {
          this.parent = parent;
      }
  
      public Map<String, Object> getAttributes() {
          if (attributes == null) {
              attributes = new HashMap<String, Object>(1);
          }
  
          return attributes;
      }
  
      public Object getAttribute(String name) {
          if (attributes == null) {
              return null;
          }
  
          return attributes.get(name);
      }
  
      public boolean containsAttribute(String name) {
          if (attributes == null) {
              return false;
          }
  
          return attributes.containsKey(name);
      }
  
      public void putAttribute(String name, Object value) {
          if (attributes == null) {
              attributes = new HashMap<String, Object>(1);
          }
  
          attributes.put(name, value);
      }
  
      public Map<String, Object> getAttributesDirect() {
          return attributes;
      }
  
      @SuppressWarnings("unchecked")
      public void addBeforeComment(String comment) {
          if (comment == null) {
              return;
          }
  
          if (attributes == null) {
              attributes = new HashMap<String, Object>(1);
          }
  
          List<String> comments = (List<String>) attributes.get("rowFormat.before_comment");
          if (comments == null) {
              comments = new ArrayList<String>(2);
              attributes.put("rowFormat.before_comment", comments);
          }
  
          comments.add(comment);
      }
  
      @SuppressWarnings("unchecked")
      public void addBeforeComment(List<String> comments) {
          if (comments == null) {
              return;
          }
          if (attributes == null) {
              attributes = new HashMap<String, Object>(1);
          }
  
          List<String> attrComments = (List<String>) attributes.get("rowFormat.before_comment");
          if (attrComments == null) {
              attributes.put("rowFormat.before_comment", comments);
          } else {
              attrComments.addAll(comments);
          }
      }
  
      @SuppressWarnings("unchecked")
      public List<String> getBeforeCommentsDirect() {
          if (attributes == null) {
              return null;
          }
  
          return (List<String>) attributes.get("rowFormat.before_comment");
      }
  
      @SuppressWarnings("unchecked")
      public void addAfterComment(String comment) {
          if (comment == null) {
              return;
          }
          if (attributes == null) {
              attributes = new HashMap<String, Object>(1);
          }
  
          List<String> comments = (List<String>) attributes.get("rowFormat.after_comment");
          if (comments == null) {
              comments = new ArrayList<String>(2);
              attributes.put("rowFormat.after_comment", comments);
          }
  
          comments.add(comment);
      }
  
      @SuppressWarnings("unchecked")
      public void addAfterComment(List<String> comments) {
          if (comments == null) {
              return;
          }
  
          if (attributes == null) {
              attributes = new HashMap<String, Object>(1);
          }
  
          List<String> attrComments = (List<String>) attributes.get("rowFormat.after_comment");
          if (attrComments == null) {
              attributes.put("rowFormat.after_comment", comments);
          } else {
              attrComments.addAll(comments);
          }
      }
  
      @SuppressWarnings("unchecked")
      public List<String> getAfterCommentsDirect() {
          if (attributes == null) {
              return null;
          }
  
          return (List<String>) attributes.get("rowFormat.after_comment");
      }
  
      public boolean hasBeforeComment() {
          if (attributes == null) {
              return false;
          }
  
          List<String> comments = (List<String>) attributes.get("rowFormat.before_comment");
  
          if (comments == null) {
              return false;
          }
  
          return !comments.isEmpty();
      }
  
      public boolean hasAfterComment() {
          if (attributes == null) {
              return false;
          }
  
          List<String> comments = (List<String>) attributes.get("rowFormat.after_comment");
          if (comments == null) {
              return false;
          }
  
          return !comments.isEmpty();
      }
  
      public SQLObject clone() {
          throw new UnsupportedOperationException(this.getClass().getName());
      }
  
      public SQLDataType computeDataType() {
          return null;
      }
  
      public int getSourceLine() {
          return sourceLine;
      }
  
      public void setSourceLine(int sourceLine) {
          this.sourceLine = sourceLine;
      }
  
      public int getSourceColumn() {
          return sourceColumn;
      }
  
      public void setSource(int line, int column) {
          this.sourceLine = line;
          this.sourceColumn = column;
      }
  
      public SQLCommentHint getHint() {
          return hint;
      }
  
      public void setHint(SQLCommentHint hint) {
          this.hint = hint;
      }
  }
  