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(issue1452) Coalesce to zero to avoid NaN arithmetic.
author Andre Heinecke <aheinecke@intevation.de>
date Fri, 30 Aug 2013 15:45:14 +0200
parents 5aa05a7a34b7
children
rev   line source
3244
1a79d47ed14b Copied content from doc/datacage.txt to doc/datacage-config-manual (texed).
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1 \section{Configuration of the Datacage}
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3 \subsection{Tasks and Recommendation types of the datacage}
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5 The datacage serves two purposes.
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6 It handles automatic 'recommendations', which are instructions
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7 sent by the client to add newly created artifacts to the collection.
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8 From a user perspective, these artifacts mainly represent curves or data
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9 points in the resulting diagrams.
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10 The second task is to let the user add already existing artifacts (i.e.
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11 previous calculations) or new artifacts with access to related data.
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13 Irrelevant of the type of elements (recommendations or user picked data) the
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14 datacage can iterate over possible artifacts by accessing its own database.
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15 Thus, to create a list of matching entries, database queries are used.
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17 \subsection{Structure of the datacage configuration file meta-data.conf}
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19 The datacages behaviour is defined in the file conf/meta-data.xml .
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21 In meta-data.xml, database queries are defined as \verb!<dc:statement>! elements,
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22 for example
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23 \begin{lstlisting}
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24 <dc:statement>
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25 SELECT id AS prot_id,
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26 description AS prot_description
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27 FROM wsts WHERE kind = 1 AND river_id = ${river_id}
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28 </dc:statement>
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29 \end{lstlisting}
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31 As can be seen from the example, the datacage configuration file can maintain
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32 its own stack of variables (\${river\_id} in above example).
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33
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34 The database query will usually deliver one or many results, over which is
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35 iterated using the \verb!<dc:elements>! elements.
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37 Information from this results can be used for two goals.
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38 It can be taken as output, in which
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39 case the client will either request the creation of these artifacts (considering
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40 recommendations), or shown by the client in a the 'datacage widget',
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41 the graphical representation of data which can be added in the current
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42 context. The later is seen when the user clicks on the Datacage button in
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43 a diagram.
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44 Or information can be used to feed a second (or third...) database query.
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45 Following above example:
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46
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47 \begin{lstlisting}
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48 <dc:statement>
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49 SELECT id AS prot_id,
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50 description AS prot_description
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51 FROM wsts WHERE kind = 1 AND river_id = ${river_id}
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52 </dc:statement>
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53 <dc:elements>
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54 <additional>
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55 <dc:attribute name="name" value="${prot_description}"/>
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56 <dc:context>
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57 <dc:statement>
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58 SELECT id AS prot_column_id,
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59 name AS prot_column_name,
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60 position AS prot_rel_pos
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61 FROM wst_columns WHERE wst_id = ${prot_id}
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62 ORDER by position
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63 </dc:statement>
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64 <!-- ... -->
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65 \end{lstlisting}
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66
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67 In both cases, an \verb!<dc:elements>! element makes database queries available.
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68 Also
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69 note how the variables are defined in the first query and reused in the second
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70 query (\$\{prot\_it\}).
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71
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72 Any alement not prefixed with "dc" represents a (sub-) node in the resulting
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73 tree. The client will display these nodes and maybe subnodes in the datacage
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74 widget - \verb!<additional>! in above example. The elements name is translated by
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75 the client.
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76
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77 While iterating the final results, \verb!<dc:attributes>! have to be specified
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78 to define how the artifact is to be created.
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79
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80 \begin{lstlisting}
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81 <dc:elements>
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82 <column>
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83 <dc:attribute name="name" value="${prot_column_name}"/>
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84 <dc:attribute name="ids" value="additionals-wstv-${prot_rel_pos}-${prot_id}"/>
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85 <dc:attribute name="factory" value="staticwkms"/>
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86 </column>
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87 </dc:elements>
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88 \end{lstlisting}
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89
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90 The "name" attribute is what is to be displayed in the client, the "ids" are given
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91 to the server and pass important information about the chosen data.
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92 The "factory" is chosen according to the type of data displayed.
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93
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94 So far, three other elements have not yet been mentioned: \verb!<dc:comment>!,
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95 \verb!<dc:if>! and the \verb!<dc:when><dc:otherwise>! structure.
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96 \verb!<dc:comment>! is an element to allow comments. Choose these over standard
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97 \verb=<!-- -->= xml comments, because they are not transferred to the client.
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98 \verb!<dc:if>! and \verb!<dc:when>! allow control (rather: definition) flow within
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99 the configuration and work in analogy to the XSL-elements \verb!<xsl:if>!
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100 and \verb!<xsl:when>!.
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101
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102 When dealing with the behaviour specification of the datacage, multiple
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103 interpretations for the term "context" are possible.
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104 A \verb!<dc:context>! element essentially means a database binding. Thus each
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105 query (\verb!<dc:statement>!) needs to be nested in its own context.
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106 Furthermore, two types of databases with own bindings exist:
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107 The "system" (default for \verb!<dc:context>!, \verb!<dc:context connection="system">!)
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108 context allows queries related to the backend database with existing
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109 data (e.g. measurements).
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110 The "user" context (\verb!<dc:context connection="user">!) allows queries against
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111 the database which stores information about already existing artifacts and
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112 calculations.
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113
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114 Another connotation for the term "context" is the situation from which
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115 the datacage is queried. The standard case is a from the datacage widget.
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116 When the user opens the datacage from the graphical client, this is done
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117 from one of possible multiple diagrams.
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118 When the datacage is queried, it gets as an argument the "out" of
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119 the current artifact. The out corresponds to the diagram type.
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120
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121 For example the inner block of
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122
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123 \begin{lstlisting}
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124 <dc:if test="dc:contains($artifact-outs, 'longitudinal_section')">
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125 <longitudinal_section>
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126 <dc:call-macro name="annotations"/>
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127 </longitudinal_section>
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128 </dc:if>
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129 \end{lstlisting}
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130
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131 will only be executed if called from the datacage within a
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132 longitudinal\_section diagram.
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133
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134 In the given example another concept of the datacage configuration is
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135 encountered: Macros.
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136
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137 Macros help to avoid duplication of parts of the document. As the datacage
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138 of some diagrams should include the same type of data, the same query should
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139 be executed in multiple situations.
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140
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141 Therefore a macro can be defined, like in
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142
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143 \begin{lstlisting}
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144 <dc:macro name="basedata_4_heightmarks-wq">
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145 <heightmarks>
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146 <dc:context>
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147 <dc:statement>
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148 SELECT id AS prot_id,
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149 description AS prot_description
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150 FROM wsts WHERE kind = 4 AND river_id = ${river_id}
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151 </dc:statement>
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152 <dc:elements>
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153 <!-- ... -->
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154 </dc:macro>
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155 \end{lstlisting}
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156
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157 and invoked from another location within the document, e.g. with
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158
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159 \begin{lstlisting}
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160
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161 <dc:call-macro name="basedata_4_heightmarks"/>
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162 \end{lstlisting}
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163 .
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164
http://dive4elements.wald.intevation.org