Create Format for OWSContext, r=ahocevar (closes #2063)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@10300 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
2010-05-11 06:51:21 +00:00
parent e67c9411b4
commit 449bc859c4
14 changed files with 1581 additions and 439 deletions
--- a/lib/OpenLayers/Format/OWSContext.js
+++ b/lib/OpenLayers/Format/OWSContext.js
@@ -0,0 +1,80 @@
+/* Copyright (c) 2006-2010 MetaCarta, Inc., published under the Clear BSD
+ * license.  See http://svn.openlayers.org/trunk/openlayers/license.txt for the
+ * full text of the license. */
+
+/**
+ * @requires OpenLayers/Format/Context.js
+ */
+
+/**
+ * Class: OpenLayers.Format.OWSContext
+ * Read and write OWS Context documents. OWS Context documents are a 
+ * preliminary OGC (Open Geospatial Consortium) standard for storing the 
+ * state of a web mapping application. In a way it is the successor to
+ * Web Map Context (WMC), since it is more generic and more types of layers
+ * can be stored. Also, nesting of layers is supported since version 0.3.1.
+ * For more information see: http://www.ogcnetwork.net/context
+ */
+OpenLayers.Format.OWSContext = OpenLayers.Class(OpenLayers.Format.Context,{
+    
+    /**
+     * APIProperty: defaultVersion
+     * {String} Version number to assume if none found.  Default is "0.3.1".
+     */
+    defaultVersion: "0.3.1",
+    
+    /**
+     * Method: getParser
+     * Get the OWSContext parser given a version. Create a new parser if it does not
+     * already exist.
+     *
+     * Parameters:
+     * version - {String} The version of the parser.
+     *
+     * Returns:
+     * {<OpenLayers.Format.OWSContext>} An OWSContext parser.
+     */
+    getParser: function(version) {
+        var v = version || this.version || this.defaultVersion;
+        // 0.3.1 is backwards compatible with 0.3.0
+        if (v === "0.3.0") {
+            v = this.defaultVersion;
+        }
+        if(!this.parser || this.parser.VERSION != v) {
+            var format = OpenLayers.Format.OWSContext[
+                "v" + v.replace(/\./g, "_")
+            ];
+            if(!format) {
+                throw "Can't find a OWSContext parser for version " + v;
+            }
+            this.parser = new format(this.options);
+        }
+        return this.parser;
+    },
+
+    /**
+     * Method: toContext
+     * Create a context object free from layer given a map or a
+     * context object.
+     *
+     * Parameters:
+     * obj - {<OpenLayers.Map> | Object} The map or context.
+     *
+     * Returns:
+     * {Object} A context object.
+     */
+    toContext: function(obj) {
+        var context = {};
+        if(obj.CLASS_NAME == "OpenLayers.Map") {
+            context.bounds = obj.getExtent();
+            context.maxExtent = obj.maxExtent;
+            context.projection = obj.projection;
+            context.size = obj.getSize();
+            context.layers = obj.layers;
+        }
+        return context;
+    },
+
+    CLASS_NAME: "OpenLayers.Format.OWSContext" 
+
+});