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Java > Open Source Codes > com > caucho > quercus > program > BlockStatement


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  *
23  * Free Software Foundation, Inc.
24  * 59 Temple Place, Suite 330
25  * Boston, MA 02111-1307 USA
26  *
27  * @author Scott Ferguson
28  */
29
30 package com.caucho.quercus.program;
31
32 import com.caucho.quercus.Location;
33 import com.caucho.quercus.env.Env;
34 import com.caucho.quercus.env.Value;
35
36 import java.util.ArrayList JavaDoc;
37
38 /**
39  * Represents sequence of statements.
40  */
41 public class BlockStatement extends Statement {
42   protected Statement []_statements;
43
44   public BlockStatement(Location location, Statement []statements)
45   {
46     super(location);
47
48     _statements = statements;
49   }
50
51   public BlockStatement(Location location, ArrayList JavaDoc<Statement> statementList)
52   {
53     super(location);
54
55     _statements = new Statement[statementList.size()];
56     statementList.toArray(_statements);
57   }
58
59   public BlockStatement append(ArrayList JavaDoc<Statement> statementList)
60   {
61     Statement []statements
62       = new Statement[_statements.length + statementList.size()];
63
64     System.arraycopy(_statements, 0, statements, 0, _statements.length);
65
66     for (int i = 0; i < statementList.size(); i++)
67       statements[i + _statements.length] = statementList.get(i);
68
69     return new BlockStatement(getLocation(), statements);
70   }
71
72   public Statement []getStatements()
73   {
74     return _statements;
75   }
76
77   /**
78    * Returns true if the statement can fallthrough.
79    */
80   public int fallThrough()
81   {
82     for (int i = 0; i < getStatements().length; i++) {
83       Statement stmt = getStatements()[i];
84       
85       int fallThrough = stmt.fallThrough();
86
87       if (fallThrough != FALL_THROUGH)
88     return fallThrough;
89     }
90
91     return FALL_THROUGH;
92   }
93
94   public Value execute(Env env)
95   {
96     for (int i = 0; i < _statements.length; i++) {
97       Statement statement = _statements[i];
98
99       Value value = statement.execute(env);
100
101       if (value != null) {
102     return value;
103       }
104     }
105
106     return null;
107   }
108 }
109
110
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