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.statement;
  
  import com.alibaba.druid.sql.SQLUtils;
  import com.alibaba.druid.sql.ast.*;
  import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
  import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  import com.alibaba.druid.util.FnvHash;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public abstract class SQLTableSourceImpl extends SQLObjectImpl implements SQLTableSource {
      protected boolean needAsTokenForAlias;
      protected String alias;
      protected List<SQLHint> hints;
      protected SQLExpr flashback;
      protected long aliasHashCode64;
      protected SQLPivot pivot;
      protected SQLUnpivot unpivot;
  
      public SQLTableSourceImpl() {
      }
  
      public SQLTableSourceImpl(String alias) {
          this.alias = alias;
      }
  
      public boolean isNeedAsTokenForAlias() {
          return needAsTokenForAlias;
      }
  
      public void setNeedAsTokenForAlias(boolean needAsTokenForAlias) {
          this.needAsTokenForAlias = needAsTokenForAlias;
      }
  
      public String getAlias() {
          return this.alias;
      }
  
      public String getAlias2() {
          if (this.alias == null || this.alias.length() == 0) {
              return alias;
          }
  
          char first = alias.charAt(0);
          if (first == '"' || first == '\'') {
              char[] chars = new char[alias.length() - 2];
              int len = 0;
              for (int i = 1; i < alias.length() - 1; ++i) {
                  char ch = alias.charAt(i);
                  if (ch == '\\') {
                      ++i;
                      ch = alias.charAt(i);
                  }
                  chars[len++] = ch;
              }
              return new String(chars, 0, len);
          }
  
          return alias;
      }
  
      public void setAlias(String alias) {
          this.alias = alias;
          this.aliasHashCode64 = 0L;
      }
  
      public int getHintsSize() {
          if (hints == null) {
              return 0;
          }
  
          return hints.size();
      }
  
      public List<SQLHint> getHints() {
          if (hints == null) {
              hints = new ArrayList<SQLHint>(2);
          }
          return hints;
      }
  
      public void setHints(List<SQLHint> hints) {
          this.hints = hints;
      }
  
      public SQLTableSource clone() {
          throw new UnsupportedOperationException(this.getClass().getName());
      }
  
      public String computeAlias() {
          return alias;
      }
  
      public SQLExpr getFlashback() {
          return flashback;
      }
  
      public void setFlashback(SQLExpr flashback) {
          if (flashback != null) {
              flashback.setParent(this);
          }
          this.flashback = flashback;
      }
  
      public boolean containsAlias(String alias) {
          if (SQLUtils.nameEquals(this.alias, alias)) {
              return true;
          }
  
          return false;
      }
  
      public long aliasHashCode64() {
          if (aliasHashCode64 == 0
                  && alias != null) {
              aliasHashCode64 = FnvHash.hashCode64(alias);
          }
          return aliasHashCode64;
      }
  
      public SQLColumnDefinition findColumn(String columnName) {
          if (columnName == null) {
              return null;
          }
  
          long hash = FnvHash.hashCode64(columnName);
          return findColumn(hash);
      }
  
      public SQLColumnDefinition findColumn(long columnNameHash) {
          return null;
      }
  
      public SQLObject resolveColumn(long columnNameHash) {
          return findColumn(columnNameHash);
      }
  
      public SQLTableSource findTableSourceWithColumn(String columnName) {
          if (columnName == null) {
              return null;
          }
  
          long hash = FnvHash.hashCode64(columnName);
          return findTableSourceWithColumn(hash, columnName, 0);
      }
  
      public SQLTableSource findTableSourceWithColumn(SQLName columnName) {
          if (columnName instanceof SQLIdentifierExpr) {
              return findTableSourceWithColumn(
                      columnName.nameHashCode64(), columnName.getSimpleName(), 0);
          }
  
          if (columnName instanceof SQLPropertyExpr) {
              SQLExpr owner = ((SQLPropertyExpr) columnName).getOwner();
              if (owner instanceof SQLIdentifierExpr) {
                  return findTableSource(((SQLIdentifierExpr) owner).nameHashCode64());
              }
          }
  
          return null;
      }
  
      public SQLTableSource findTableSourceWithColumn(long columnNameHash) {
          return findTableSourceWithColumn(columnNameHash, null, 0);
      }
  
      public SQLTableSource findTableSourceWithColumn(long columnNameHash, String columnName, int option) {
          return null;
      }
  
      public SQLTableSource findTableSource(String alias) {
          long hash = FnvHash.hashCode64(alias);
          return findTableSource(hash);
      }
  
      public SQLTableSource findTableSource(long alias_hash) {
          long hash = this.aliasHashCode64();
          if (hash != 0 && hash == alias_hash) {
              return this;
          }
          return null;
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
  
          SQLTableSourceImpl that = (SQLTableSourceImpl) o;
  
          if (aliasHashCode64() != that.aliasHashCode64()) {
              return false;
          }
          if (hints != null ? !hints.equals(that.hints) : that.hints != null) {
              return false;
          }
          return flashback != null ? flashback.equals(that.flashback) : that.flashback == null;
      }
  
      @Override
      public int hashCode() {
          int result = (hints != null ? hints.hashCode() : 0);
          result = 31 * result + (flashback != null ? flashback.hashCode() : 0);
          result = 31 * result + (int) (aliasHashCode64() ^ (aliasHashCode64() >>> 32));
          return result;
      }
  
      @Override
      public SQLPivot getPivot() {
          return pivot;
      }
  
      @Override
      public void setPivot(SQLPivot x) {
          if (x != null) {
              x.setParent(this);
          }
          this.pivot = x;
      }
  
      public SQLUnpivot getUnpivot() {
          return unpivot;
      }
  
      public void setUnpivot(SQLUnpivot x) {
          if (x != null) {
              x.setParent(this);
          }
          this.unpivot = x;
      }
  
      @Override
      protected void accept0(SQLASTVisitor visitor) {
          if (visitor.visit(this)) {
              acceptChild(visitor, this.flashback);
              acceptChild(visitor, this.pivot);
              acceptChild(visitor, this.unpivot);
          }
          visitor.endVisit(this);
      }
  }
  