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| <h2 title="Class DataSchemaLoader" class="title">Class DataSchemaLoader</h2> |
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| <pre>public class <span class="strong">DataSchemaLoader</span> |
| extends java.lang.Object</pre> |
| <div class="block">Class to load any data schemas specified in the properties file, 'data.schemas' |
| <p> |
| Schemas should be specified as follows: |
| |
| <pre> |
| <code><schema> |
| <schemaName> name of the schema </schemaName> |
| <element> |
| <name> element name; note that element names are case sensitive </name> |
| <type> class name or type name (if Java primitive type) of the element </type> |
| <isArray> whether or not the schema element is an array within the data. |
| Set to true by including this tag with no text or the string "true" (comparison is case-insensitive). |
| Omitting this tag or using any other text indicates this element is not an array.</isArray> |
| <partitioner> optional - Partitioner class for the element; defaults to primitive java type partitioner </partitioner> |
| </element> |
| </schema> |
| </code> |
| </pre> |
| |
| Primitive types must be one of the following: "byte", "short", "int", "long", "float", "double", "char", "string" |
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| <td class="colOne"><code><strong><a href="../../../../../org/apache/pirk/schema/data/DataSchemaLoader.html#DataSchemaLoader()">DataSchemaLoader</a></strong>()</code> |
| <div class="block">Default constructor.</div> |
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| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/pirk/schema/data/DataSchemaLoader.html#initialize()">initialize</a></strong>()</code> |
| <div class="block">Initializes the static <a href="../../../../../org/apache/pirk/schema/data/DataSchemaRegistry.html" title="class in org.apache.pirk.schema.data"><code>DataSchemaRegistry</code></a> with a list of available data schema names.</div> |
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| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/pirk/schema/data/DataSchemaLoader.html#initialize(boolean,%20org.apache.hadoop.fs.FileSystem)">initialize</a></strong>(boolean hdfs, |
| org.apache.hadoop.fs.FileSystem fs)</code> |
| <div class="block">Initializes the static <a href="../../../../../org/apache/pirk/schema/data/DataSchemaRegistry.html" title="class in org.apache.pirk.schema.data"><code>DataSchemaRegistry</code></a> with a list of available data schema names.</div> |
| </td> |
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| <td class="colFirst"><code><a href="../../../../../org/apache/pirk/schema/data/DataSchema.html" title="class in org.apache.pirk.schema.data">DataSchema</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../../org/apache/pirk/schema/data/DataSchemaLoader.html#loadSchema(java.io.InputStream)">loadSchema</a></strong>(java.io.InputStream stream)</code> |
| <div class="block">Returns the data schema as defined in XML format on the given stream.</div> |
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| <h4>DataSchemaLoader</h4> |
| <pre>public DataSchemaLoader()</pre> |
| <div class="block">Default constructor.</div> |
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| <h4>initialize</h4> |
| <pre>public static void initialize() |
| throws java.lang.Exception</pre> |
| <div class="block">Initializes the static <a href="../../../../../org/apache/pirk/schema/data/DataSchemaRegistry.html" title="class in org.apache.pirk.schema.data"><code>DataSchemaRegistry</code></a> with a list of available data schema names.</div> |
| <dl><dt><span class="strong">Throws:</span></dt> |
| <dd><code>java.lang.Exception</code></dd></dl> |
| </li> |
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| <pre>public static void initialize(boolean hdfs, |
| org.apache.hadoop.fs.FileSystem fs) |
| throws java.lang.Exception</pre> |
| <div class="block">Initializes the static <a href="../../../../../org/apache/pirk/schema/data/DataSchemaRegistry.html" title="class in org.apache.pirk.schema.data"><code>DataSchemaRegistry</code></a> with a list of available data schema names.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>hdfs</code> - If true, specifies that the data schema is an hdfs file; if false, that it is a regular file.</dd><dd><code>fs</code> - Used only when <code>hdfs</code> is true; the <code>FileSystem</code> handle for the hdfs in which the data schema exists</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code>java.lang.Exception</code></dd></dl> |
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| <h4>loadSchema</h4> |
| <pre>public <a href="../../../../../org/apache/pirk/schema/data/DataSchema.html" title="class in org.apache.pirk.schema.data">DataSchema</a> loadSchema(java.io.InputStream stream) |
| throws java.io.IOException, |
| <a href="../../../../../org/apache/pirk/utils/PIRException.html" title="class in org.apache.pirk.utils">PIRException</a></pre> |
| <div class="block">Returns the data schema as defined in XML format on the given stream.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>stream</code> - The source of the XML data schema description.</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>The data schema.</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code>java.io.IOException</code> - A problem occurred reading from the given stream.</dd> |
| <dd><code><a href="../../../../../org/apache/pirk/utils/PIRException.html" title="class in org.apache.pirk.utils">PIRException</a></code> - The schema description is invalid.</dd></dl> |
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