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Java > Open Source Codes > org > mmbase > bridge > jsp > taglib > containers > QueryCompositeConstraintTag


1 /*
2
3 This software is OSI Certified Open Source Software.
4 OSI Certified is a certification mark of the Open Source Initiative.
5
6 The license (Mozilla version 1.0) can be read at the MMBase site.
7 See http://www.MMBase.org/license
8
9 */
10 package org.mmbase.bridge.jsp.taglib.containers;
11
12 import java.util.*;
13
14 import javax.servlet.jsp.JspTagException JavaDoc;
15
16 import org.mmbase.bridge.Query;
17 import org.mmbase.bridge.jsp.taglib.CloudReferrerTag;
18 import org.mmbase.bridge.jsp.taglib.util.Attribute;
19 import org.mmbase.bridge.util.Queries;
20 import org.mmbase.storage.search.*;
21
22 /**
23  * mm:composite makes it possible to connect constraints by 'OR'.
24  *
25  * @author Pierre van Rooden
26  * @author Michiel Meeuwissen
27  * @since MMBase-1.7
28  * @version $Id: QueryCompositeConstraintTag.java,v 1.6 2005/12/21 11:39:25 michiel Exp $
29  */
30 public class QueryCompositeConstraintTag extends CloudReferrerTag implements QueryContainerReferrer {
31
32     // private static final Logger log = Logging.getLoggerInstance(NodeListCompositeConstraintTag.class);
33
34     protected Attribute container = Attribute.NULL;
35
36     protected Attribute operator = Attribute.NULL;
37
38     private List constraints;
39
40     public void setContainer(String JavaDoc c) throws JspTagException JavaDoc {
41         container = getAttribute(c);
42     }
43
44     public void setOperator(String JavaDoc o) throws JspTagException JavaDoc {
45         operator = getAttribute(o);
46     }
47
48     protected int getOperator() throws JspTagException JavaDoc {
49         String JavaDoc op = operator.getString(this).toUpperCase();
50         if (op.equals("OR")) {
51             return CompositeConstraint.LOGICAL_OR;
52         } else if (op.equals("AND") || op.equals("")) {
53             return CompositeConstraint.LOGICAL_AND;
54         } else {
55             throw new JspTagException JavaDoc("Unknown Field Compare Operator '" + op + "'");
56         }
57     }
58
59     public void addChildConstraint(Constraint cons) throws JspTagException JavaDoc {
60         constraints.add(cons);
61     }
62
63     private Constraint addConstraint(Query query, int op, List constraints) throws JspTagException JavaDoc {
64         Constraint newConstraint = null;
65         for (Iterator i = constraints.iterator(); i.hasNext();) {
66             Constraint constraint = (Constraint) i.next();
67             if (newConstraint == null) {
68                 newConstraint = constraint;
69             } else {
70                 newConstraint = query.createConstraint(newConstraint, op, constraint);
71             }
72         }
73         if (newConstraint != null) {
74             // if there is a OR or an AND tag, add
75 // the constraint to that tag,
76 // otherwise add it direct to the query
77 QueryCompositeConstraintTag cons = (QueryCompositeConstraintTag) findParentTag(QueryCompositeConstraintTag.class, (String JavaDoc) container.getValue(this), false);
78             if (cons != null) {
79                 cons.addChildConstraint(newConstraint);
80             } else {
81                 newConstraint = Queries.addConstraint(query, newConstraint);
82             }
83         }
84         return newConstraint;
85     }
86
87     public int doStartTag() throws JspTagException JavaDoc {
88         constraints = new ArrayList();
89         return EVAL_BODY;
90     }
91
92     public int doAfterBody() throws JspTagException JavaDoc {
93         QueryContainer c = (QueryContainer) findParentTag(QueryContainer.class, (String JavaDoc) container.getValue(this));
94         Query query = c.getQuery();
95
96         addConstraint(query, getOperator(), constraints);
97         if(EVAL_BODY == EVAL_BODY_BUFFERED) {
98             try {
99                 if (bodyContent != null) {
100                     bodyContent.writeOut(bodyContent.getEnclosingWriter());
101                 }
102             } catch (java.io.IOException JavaDoc ioe){
103                 throw new JspTagException JavaDoc(ioe.toString());
104             }
105         }
106         return SKIP_BODY;
107     }
108     public int doEndTag() throws JspTagException JavaDoc {
109         constraints = null;
110         return super.doEndTag();
111     }
112
113
114
115 }
116
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