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#region Copyright
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#endregion
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using System;
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using System.Collections;
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using Seasar.Dao.Node;
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using Seasar.Framework.Util;
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namespace Seasar.Dao.Parser
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{
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public class SqlParserImpl : ISqlParser
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{
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private ISqlTokenizer tokenizer;
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private Stack nodeStack = new Stack();
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public SqlParserImpl(string sql)
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{
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sql = sql.Trim();
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if (sql.EndsWith(";"))
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{
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sql = sql.Substring(0, sql.Length - 1);
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}
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tokenizer = new SqlTokenizerImpl(sql);
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}
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public INode Parse()
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{
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Push(new ContainerNode());
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while (TokenType.EOF != tokenizer.Next())
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{
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ParseToken();
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}
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return Pop();
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}
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protected void ParseToken()
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{
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switch (tokenizer.TokenType)
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{
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case TokenType.SQL:
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ParseSql();
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break;
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case TokenType.COMMENT:
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ParseComment();
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break;
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case TokenType.ELSE:
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ParseElse();
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break;
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case TokenType.BIND_VARIABLE:
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ParseBindVariable();
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break;
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}
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}
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protected void ParseSql()
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{
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string sql = tokenizer.Token;
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if (IsElseMode())
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{
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sql = sql.Replace("--", "");
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}
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INode node = Peek();
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if ( (node is IfNode || node is ElseNode) && node.ChildSize == 0)
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{
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ISqlTokenizer st = new SqlTokenizerImpl(sql);
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st.SkipWhitespace();
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string token = st.SkipToken();
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st.SkipWhitespace();
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if ("AND".Equals(token.ToUpper()) || "OR".Equals(token.ToUpper()))
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{
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node.AddChild(new PrefixSqlNode(st.Before, st.After));
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}
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else
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{
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node.AddChild(new SqlNode(sql));
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}
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}
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else
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{
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node.AddChild(new SqlNode(sql));
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}
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}
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protected void ParseComment()
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{
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string comment = tokenizer.Token;
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if (IsTargetComment(comment))
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{
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if (IsIfComment(comment))
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{
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ParseIf();
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}
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else if (IsBeginComment(comment))
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{
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ParseBegin();
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}
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else if (IsEndComment(comment))
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{
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return;
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}
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else
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{
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ParseCommentBindVariable();
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}
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}
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}
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protected void ParseIf()
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{
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string condition = tokenizer.Token.Substring(2).Trim();
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if (StringUtil.IsEmpty(condition))
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{
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throw new IfConditionNotFoundRuntimeException();
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}
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IfNode ifNode = new IfNode(condition);
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Peek().AddChild(ifNode);
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Push(ifNode);
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ParseEnd();
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}
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protected void ParseBegin()
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{
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BeginNode beginNode = new BeginNode();
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Peek().AddChild(beginNode);
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Push(beginNode);
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ParseEnd();
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}
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protected void ParseEnd()
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{
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while (TokenType.EOF != tokenizer.Next())
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{
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if (tokenizer.TokenType == TokenType.COMMENT
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&& IsEndComment(tokenizer.Token))
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{
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Pop();
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return;
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}
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ParseToken();
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}
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throw new EndCommentNotFoundRuntimeException();
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}
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protected void ParseElse()
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{
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INode parent = Peek();
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if ( !(parent is IfNode) )
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{
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return;
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}
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IfNode ifNode = (IfNode) Pop();
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ElseNode elseNode = new ElseNode();
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ifNode.ElseNode = elseNode;
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Push(elseNode);
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tokenizer.SkipWhitespace();
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}
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protected void ParseCommentBindVariable()
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{
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string expr = tokenizer.Token;
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string s = tokenizer.SkipToken();
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if (s.StartsWith("(") && s.EndsWith(")"))
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{
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Peek().AddChild(new ParenBindVariableNode(expr));
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}
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else if (expr.StartsWith("$"))
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{
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Peek().AddChild(new EmbeddedValueNode(expr.Substring(1)));
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}
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else
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{
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Peek().AddChild(new BindVariableNode(expr));
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}
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}
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protected void ParseBindVariable()
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{
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string expr = tokenizer.Token;
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Peek().AddChild(new BindVariableNode(expr));
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}
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protected INode Pop()
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{
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return (INode) nodeStack.Pop();
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}
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protected INode Peek()
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{
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return (INode) nodeStack.Peek();
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}
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protected void Push(INode node)
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{
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nodeStack.Push(node);
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}
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protected bool IsElseMode()
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{
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for (int i = 0; i < nodeStack.Count; ++i)
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{
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if (nodeStack.ToArray()[i] is ElseNode)
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{
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return true;
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}
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}
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return false;
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}
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private static bool IsTargetComment(string comment)
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{
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return comment != null && comment.Length > 0
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&& IsCSharpIdentifierStart(comment.ToCharArray()[0]);
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}
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private static bool IsCSharpIdentifierStart(Char c)
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{
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return Char.IsLetterOrDigit(c) || c == '_' || c == '\\' || c == '$' || c == '@';
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}
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private static bool IsIfComment(string comment)
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{
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return comment.StartsWith("IF");
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}
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private static bool IsBeginComment(string content)
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{
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return content != null && "BEGIN".Equals(content);
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}
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private static bool IsEndComment(string content)
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{
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return content != null && "END".Equals(content);
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}
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}
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}
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