Mercurial > dive4elements > river

annotate flys-artifacts/doc/datacage-config-manual/content.tex @ 4241:49cb65d5932d

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Improved the historical discharge calculation. The calculation now creates new HistoricalWQKms (new subclass of WQKms). Those WQKms are used to create new facets from (new) type 'HistoricalDischargeCurveFacet'. The chart generator is improved to support those facets.
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 24 Oct 2012 14:34:35 +0200
parents 1a79d47ed14b
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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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 = ${prot_id}
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62 ORDER by position
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63 </dc:statement>
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64 <!-- ... -->
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65 \end{lstlisting}
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66
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67 In both cases, an \verb!<dc:elements>! element makes database queries available.
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68 Also
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69 note how the variables are defined in the first query and reused in the second
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70 query (\$\{prot\_it\}).
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72 Any alement not prefixed with "dc" represents a (sub-) node in the resulting
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73 tree. The client will display these nodes and maybe subnodes in the datacage
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74 widget - \verb!<additional>! in above example. The elements name is translated by
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75 the client.
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76
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77 While iterating the final results, \verb!<dc:attributes>! have to be specified
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78 to define how the artifact is to be created.
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79
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80 \begin{lstlisting}
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81 <dc:elements>
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82 <column>
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83 <dc:attribute name="name" value="${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