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


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 javax.servlet.jsp.JspTagException JavaDoc;
13
14 import org.mmbase.bridge.*;
15 import org.mmbase.bridge.jsp.taglib.CloudReferrerTag;
16 import org.mmbase.bridge.jsp.taglib.util.Attribute;
17 import org.mmbase.bridge.util.Queries;
18 import org.mmbase.cache.CachePolicy;
19
20 /**
21  * Container cognate for ListTag.
22  *
23  * @author Michiel Meeuwissen
24  * @since MMBase-1.7
25  * @version $Id: ListContainerTag.java,v 1.18 2006/07/04 12:16:09 michiel Exp $
26  */
27 public class ListContainerTag extends CloudReferrerTag implements QueryContainer {
28
29     private Query query = null;
30     private Attribute cachePolicy = Attribute.NULL;
31     private Attribute path = Attribute.NULL;
32     private Attribute searchDirs = Attribute.NULL;
33     private Attribute fields = Attribute.NULL;
34     protected Attribute nodes = Attribute.NULL;
35     protected String JavaDoc jspVar = null;
36
37     public void setCachepolicy(String JavaDoc t) throws JspTagException JavaDoc {
38         cachePolicy = getAttribute(t);
39     }
40
41     public void setPath(String JavaDoc t) throws JspTagException JavaDoc {
42         path = getAttribute(t);
43     }
44
45     public void setSearchdirs(String JavaDoc s) throws JspTagException JavaDoc {
46         searchDirs = getAttribute(s);
47     }
48
49     public void setFields(String JavaDoc f) throws JspTagException JavaDoc {
50         fields = getAttribute(f);
51     }
52
53     /**
54      * @since MMBase-1.7.1
55      */
56     public void setNodes(String JavaDoc n) throws JspTagException JavaDoc {
57         nodes = getAttribute(n);
58     }
59
60     /**
61      * @since MMBase-1.8.1
62      */
63     public void setJspvar(String JavaDoc jv) {
64         jspVar = jv;
65     }
66
67
68     public Query getQuery() {
69         if (query.isUsed()) query = (Query) query.clone();
70         return query;
71     }
72
73     // overridden from CloudReferrer.
74 public Cloud getCloudVar() throws JspTagException JavaDoc {
75         if (query == null) return super.getCloudVar(); // I think that this does not happen.
76 return query.getCloud();
77     }
78
79
80     public int doStartTag() throws JspTagException JavaDoc {
81         if (getReferid() != null) {
82             query = (Query) getContextProvider().getContextContainer().getObject(getReferid());
83         } else {
84             if (path == Attribute.NULL) {
85                 throw new JspTagException JavaDoc("Path attribute is mandatory");
86             }
87             Cloud cloud = getCloudVar();
88             query = cloud.createQuery();
89         }
90
91         if (getId() != null) { // write to context.
92 getContextProvider().getContextContainer().register(getId(), query);
93         }
94         if (jspVar != null) {
95             pageContext.setAttribute(jspVar, query);
96         }
97
98         if (cachePolicy != Attribute.NULL) {
99             query.setCachePolicy(CachePolicy.getPolicy(cachePolicy.getValue(this)));
100         }
101
102         Queries.addPath(query, (String JavaDoc) path.getValue(this), (String JavaDoc) searchDirs.getValue(this));
103
104         Queries.addFields(query, (String JavaDoc) fields.getValue(this));
105
106         Queries.addStartNodes(query, nodes.getString(this));
107
108         return EVAL_BODY;
109     }
110
111     public int doAfterBody() throws JspTagException JavaDoc {
112         if (EVAL_BODY == EVAL_BODY_BUFFERED) {
113             try {
114                 if (bodyContent != null) {
115                     bodyContent.writeOut(bodyContent.getEnclosingWriter());
116                 }
117             } catch (java.io.IOException JavaDoc ioe){
118                 throw new JspTagException JavaDoc(ioe.toString());
119             }
120         }
121         return SKIP_BODY;
122     }
123     public int doEndTag() throws JspTagException JavaDoc {
124         query = null;
125         return super.doEndTag();
126     }
127
128     public Object JavaDoc getCurrent() {
129         return null;
130     }
131
132 }
133
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