org/apache/sis/storage/Resource.html - sis-site - Git at Google

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 <div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.sis.storage</a></div>
 <h1 title="Interface Resource" class="title">Interface Resource</h1>
 </div>
 <section class="class-description" id="class-description">
 <dl class="notes">
 <dt>All Known Subinterfaces:</dt>
 <dd><code><a href="Aggregate.html" title="interface in org.apache.sis.storage">Aggregate</a></code>, <code><a href="DataSet.html" title="interface in org.apache.sis.storage">DataSet</a></code>, <code><a href="FeatureSet.html" title="interface in org.apache.sis.storage">FeatureSet</a></code>, <code><a href="GridCoverageResource.html" title="interface in org.apache.sis.storage">GridCoverageResource</a></code>, <code><a href="tiling/TiledResource.html" title="interface in org.apache.sis.storage.tiling">TiledResource</a></code>, <code><a href="WritableAggregate.html" title="interface in org.apache.sis.storage">WritableAggregate</a></code>, <code><a href="WritableFeatureSet.html" title="interface in org.apache.sis.storage">WritableFeatureSet</a></code>, <code><a href="WritableGridCoverageResource.html" title="interface in org.apache.sis.storage">WritableGridCoverageResource</a></code>, <code><a href="tiling/WritableTiledResource.html" title="interface in org.apache.sis.storage.tiling">WritableTiledResource</a></code></dd>
 </dl>
 <dl class="notes">
 <dt>All Known Implementing Classes:</dt>
 <dd><code><a href="AbstractFeatureSet.html" title="class in org.apache.sis.storage">AbstractFeatureSet</a></code>, <code><a href="AbstractGridCoverageResource.html" title="class in org.apache.sis.storage">AbstractGridCoverageResource</a></code>, <code><a href="AbstractResource.html" title="class in org.apache.sis.storage">AbstractResource</a></code>, <code><a href="aggregate/ConcatenatedFeatureSet.html" title="class in org.apache.sis.storage.aggregate">ConcatenatedFeatureSet</a></code>, <code><a href="DataStore.html" title="class in org.apache.sis.storage">DataStore</a></code>, <code><a href="geotiff/GeoTiffStore.html" title="class in org.apache.sis.storage.geotiff">GeoTiffStore</a></code>, <code><a href="aggregate/JoinFeatureSet.html" title="class in org.apache.sis.storage.aggregate">JoinFeatureSet</a></code>, <code><a href="landsat/LandsatStore.html" title="class in org.apache.sis.storage.landsat">LandsatStore</a></code>, <code><a href="netcdf/NetcdfStore.html" title="class in org.apache.sis.storage.netcdf">NetcdfStore</a></code>, <code><a href="sql/SQLStore.html" title="class in org.apache.sis.storage.sql">SQLStore</a></code></dd>
 </dl>
 <hr>
 <div class="type-signature"><span class="modifiers">public interface </span><span class="element-name type-name-label">Resource</span></div>
 <div class="block">Provides access to geospatial data in a <code>DataStore</code>. The ISO 19115 specification defines resource as
  an <cite>“identifiable asset or means that fulfills a requirement”</cite>. For example, a resource can be a
  coverage of Sea Surface Temperature, or a coverage of water salinity, or the set of all buoys in a harbor,
  or an aggregation of all the above. A resource is not necessarily digital; it can be a paper document or an
  organization, in which case only metadata are provided. If the resource is digital, then <code>Resource</code>s
  should be instances of sub-types like <a href="Aggregate.html" title="interface in org.apache.sis.storage"><code>Aggregate</code></a> or <a href="FeatureSet.html" title="interface in org.apache.sis.storage"><code>FeatureSet</code></a>.

  <p><code>DataStore</code>s are themselves closeable resources.
  If the data store contains resources for many feature types or coverages, then the data store will be an
  instance of <a href="Aggregate.html" title="interface in org.apache.sis.storage"><code>Aggregate</code></a>. The <a href="Aggregate.html#components()">components</a> of an aggregate can be
  themselves other aggregates, thus forming a tree.</p>

  <div class="note"><b>Relationship with ISO 19115:</b>
  this type is closely related to the <code>DS_Resource</code> type defined by ISO 19115.
  The Apache SIS type differs from the ISO type by being more closely related to data extraction,
  as can be seen from the checked <a href="DataStoreException.html" title="class in org.apache.sis.storage"><code>DataStoreException</code></a> thrown by most methods.
  Convenience methods for frequently requested information – for example <a href="DataSet.html#getEnvelope()"><code>DataSet.getEnvelope()</code></a> – were added.
  The sub-types performing the actual data extraction – for example <a href="FeatureSet.html" title="interface in org.apache.sis.storage"><code>FeatureSet</code></a> – are specific to Apache SIS.
  </div></div>
 <dl class="notes">
 <dt>Since:</dt>
 <dd>0.8</dd>
 <dt>See Also:</dt>
 <dd>
 <ul class="see-list">
 <li><a href="Aggregate.html#components()"><code>Aggregate.components()</code></a></li>
 </ul>
 </dd>

 <p><font size="-1">Defined in the <code>sis-storage</code> module</font></p>
 </dl>
 </section>
 <section class="summary">
 <ul class="summary-list">
 <!-- ========== METHOD SUMMARY =========== -->
 <li>
 <section class="method-summary" id="method-summary">
 <h2>Method Summary</h2>
 <div id="method-summary-table">
 <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab3" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab3', 3)" class="table-tab">Abstract Methods</button></div>
 <div id="method-summary-table.tabpanel" role="tabpanel">
 <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0">
 <div class="table-header col-first">Modifier and Type</div>
 <div class="table-header col-second">Method</div>
 <div class="table-header col-last">Description</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>&lt;T extends <a href="event/StoreEvent.html" title="class in org.apache.sis.storage.event">StoreEvent</a>&gt;<br>void</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#addListener(java.lang.Class,org.apache.sis.storage.event.StoreListener)" class="member-name-link">addListener</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Class.html" title="class or interface in java.lang" class="external-link">Class</a>&lt;T&gt;&nbsp;eventType,
  <a href="event/StoreListener.html" title="interface in org.apache.sis.storage.event">StoreListener</a>&lt;? super T&gt;&nbsp;listener)</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
 <div class="block">Registers a listener to notify when the specified kind of event occurs in this resource or in children.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/Optional.html" title="class or interface in java.util" class="external-link">Optional</a>&lt;<a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/util/GenericName.html" title="class or interface in org.opengis.util" class="external-link">GenericName</a>&gt;</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getIdentifier()" class="member-name-link">getIdentifier</a>()</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
 <div class="block">Returns the resource persistent identifier.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/metadata/Metadata.html" title="class or interface in org.opengis.metadata" class="external-link">Metadata</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getMetadata()" class="member-name-link">getMetadata</a>()</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
 <div class="block">Returns information about this resource.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>&lt;T extends <a href="event/StoreEvent.html" title="class in org.apache.sis.storage.event">StoreEvent</a>&gt;<br>void</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#removeListener(java.lang.Class,org.apache.sis.storage.event.StoreListener)" class="member-name-link">removeListener</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Class.html" title="class or interface in java.lang" class="external-link">Class</a>&lt;T&gt;&nbsp;eventType,
  <a href="event/StoreListener.html" title="interface in org.apache.sis.storage.event">StoreListener</a>&lt;? super T&gt;&nbsp;listener)</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
 <div class="block">Unregisters a listener previously added to this resource for the given type of events.</div>
 </div>
 </div>
 </div>
 </div>
 </section>
 </li>
 </ul>
 </section>
 <section class="details">
 <ul class="details-list">
 <!-- ============ METHOD DETAIL ========== -->
 <li>
 <section class="method-details" id="method-detail">
 <h2>Method Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="getIdentifier()">
 <h3>getIdentifier</h3>
 <div class="member-signature"><span class="return-type"><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/Optional.html" title="class or interface in java.util" class="external-link">Optional</a>&lt;<a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/util/GenericName.html" title="class or interface in org.opengis.util" class="external-link">GenericName</a>&gt;</span>&nbsp;<span class="element-name">getIdentifier</span>()
                              throws <span class="exceptions"><a href="DataStoreException.html" title="class in org.apache.sis.storage">DataStoreException</a></span></div>
 <div class="block">Returns the resource persistent identifier.
  This identifier can be used to uniquely identify a resource in the containing <a href="DataStore.html" title="class in org.apache.sis.storage"><code>DataStore</code></a>.
  For this identifier to be reliable the following conditions must hold:

  <ul>
    <li>It shall be unique in the <a href="DataStore.html" title="class in org.apache.sis.storage"><code>DataStore</code></a> which contains it, if there is one.</li>
    <li>It's value shall not change after closing and reopening the <a href="DataStore.html" title="class in org.apache.sis.storage"><code>DataStore</code></a> on the same data.</li>
    <li>It should be consistent with the <code><a href="#getMetadata()">getMetadata()</a>/identificationInfo/citation/identifier</code> value.</li>
  </ul>

  If any of above conditions is not met, then this identifier should be absent.
  This case may happen when a resource is an intermediate result of an ongoing process
  or is a temporary resource generated on-the-fly, for example a sensor event.</div>
 <dl class="notes">
 <dt>Returns:</dt>
 <dd>a persistent identifier unique within the data store, or absent if this resource has no such identifier.</dd>
 <dt>Throws:</dt>
 <dd><code><a href="DataStoreException.html" title="class in org.apache.sis.storage">DataStoreException</a></code> - if an error occurred while fetching the identifier.</dd>
 <dt>Since:</dt>
 <dd>1.0</dd>
 <dt>See Also:</dt>
 <dd>
 <ul class="see-list">
 <li><a href="DataStore.html#getIdentifier()"><code>DataStore.getIdentifier()</code></a></li>
 <li><a href="DataStore.html#findResource(java.lang.String)"><code>DataStore.findResource(String)</code></a></li>
 </ul>
 </dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="getMetadata()">
 <h3>getMetadata</h3>
 <div class="member-signature"><span class="return-type"><a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/metadata/Metadata.html" title="class or interface in org.opengis.metadata" class="external-link">Metadata</a></span>&nbsp;<span class="element-name">getMetadata</span>()
               throws <span class="exceptions"><a href="DataStoreException.html" title="class in org.apache.sis.storage">DataStoreException</a></span></div>
 <div class="block">Returns information about this resource.
  If this resource is an <a href="Aggregate.html" title="interface in org.apache.sis.storage"><code>Aggregate</code></a>, then the metadata may enumerate characteristics
  (spatiotemporal extents, feature types, range dimensions, <i>etc.</i>) of all
  <a href="Aggregate.html#components()">components</a> in the aggregate, or summarize them (for example by omitting
  <a href="../metadata/iso/extent/DefaultExtent.html" title="class in org.apache.sis.metadata.iso.extent">extents</a> that are fully included in larger extents).
  If this resource is a <a href="DataSet.html" title="interface in org.apache.sis.storage"><code>DataSet</code></a>, then the metadata shall contain only the information that apply to that
  particular dataset, optionally with a reference to the parent metadata (see below).

  <p>Some relationships between metadata and resources are:</p>
  <ul class="verbose">
    <li><code>metadata</code> /
        <a href="../metadata/iso/DefaultMetadata.html#getParentMetadata()"><code>parentMetadata</code></a> /
        <a href="../metadata/iso/citation/DefaultCitation.html#getTitle()"><code>title</code></a>:<br>
        a human-readable caption for <a href="DataStore.html#getMetadata()"><code>DataStore.getMetadata()</code></a> (if not redundant with this metadata).</li>
    <li><code>metadata</code> /
        <a href="../metadata/iso/DefaultMetadata.html#getIdentificationInfo()"><code>identificationInfo</code></a> /
        <a href="../metadata/iso/identification/AbstractIdentification.html#getCitation()"><code>citation</code></a> /
        <a href="../metadata/iso/citation/DefaultCitation.html#getTitle()"><code>title</code></a>:<br>
        a human-readable designation for this resource.</li>
    <li><code>metadata</code> /
        <a href="../metadata/iso/DefaultMetadata.html#getIdentificationInfo()"><code>identificationInfo</code></a> /
        <a href="../metadata/iso/identification/AbstractIdentification.html#getAssociatedResources()"><code>associatedResource</code></a> /
        <a href="../metadata/iso/identification/DefaultAssociatedResource.html#getName()"><code>name</code></a> /
        <a href="../metadata/iso/citation/DefaultCitation.html#getTitle()"><code>title</code></a>:<br>
        a human-readable designation for parent, children or other related resources.
        May be omitted if too expensive to compute.</li>
    <li><code>metadata</code> /
        <a href="../metadata/iso/DefaultMetadata.html#getMetadataScopes()"><code>metadataScope</code></a> /
        <a href="../metadata/iso/DefaultMetadataScope.html#getResourceScope()"><code>resourceScope</code></a>:<br>
        <a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/metadata/maintenance/ScopeCode.html#DATASET" title="class or interface in org.opengis.metadata.maintenance" class="external-link"><code>ScopeCode.DATASET</code></a> if the resource is a <a href="DataSet.html" title="interface in org.apache.sis.storage"><code>DataSet</code></a>, or
        <a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/metadata/maintenance/ScopeCode.html#SERVICE" title="class or interface in org.opengis.metadata.maintenance" class="external-link"><code>ScopeCode.SERVICE</code></a> if the resource is a web service, or
        <a href="http://www.geoapi.org/3.0/javadoc/org.opengis.geoapi/org/opengis/metadata/maintenance/ScopeCode.html#SERIES" title="class or interface in org.opengis.metadata.maintenance" class="external-link"><code>ScopeCode.SERIES</code></a> or
        <code>ScopeCode.INITIATIVE</code>
        if the resource is an <a href="Aggregate.html" title="interface in org.apache.sis.storage"><code>Aggregate</code></a> other than a transfer aggregate.</li>
    <li><code>metadata</code> /
        <a href="../metadata/iso/DefaultMetadata.html#getContentInfo()"><code>contentInfo</code></a> /
        <a href="../metadata/iso/content/DefaultFeatureCatalogueDescription.html#getFeatureTypeInfo()"><code>featureType</code></a> /
        <a href="../metadata/iso/content/DefaultFeatureTypeInfo.html#getFeatureTypeName()"><code>featureTypeName</code></a>:<br>
        names of feature types included in this resource. Example: “bridge”, “road”, “river”. <i>etc.</i></li>
    <li><code>metadata</code> /
        <a href="../metadata/iso/DefaultMetadata.html#getContentInfo()"><code>contentInfo</code></a> /
        <a href="../metadata/iso/content/DefaultCoverageDescription.html#getAttributeGroups()"><code>attributeGroup</code></a> /
        <a href="../metadata/iso/content/DefaultAttributeGroup.html#getAttributes()"><code>attribute</code></a> /
        <a href="../metadata/iso/content/DefaultRangeDimension.html#getSequenceIdentifier()"><code>sequenceIdentifier</code></a>:<br>
        sample dimension names (or band numbers in simpler cases) of coverages or rasters included in this resource.</li>
  </ul>

  <h4>Metadata edition</h4>
  This method often returns an <a href="../metadata/ModifiableMetadata.State.html#FINAL">unmodifiable</a>
  metadata, for making possible to return efficiently a cached instance.
  If the caller wants to modify some metadata elements, it may be necessary to perform a
  <a href="../metadata/iso/DefaultMetadata.html#deepCopy(org.opengis.metadata.Metadata)">deep copy</a> first.</div>
 <dl class="notes">
 <dt>Returns:</dt>
 <dd>information about this resource. Should not be <code>null</code>.</dd>
 <dt>Throws:</dt>
 <dd><code><a href="DataStoreException.html" title="class in org.apache.sis.storage">DataStoreException</a></code> - if an error occurred while reading the metadata.</dd>
 <dt>See Also:</dt>
 <dd>
 <ul class="see-list-long">
 <li><a href="DataStore.html#getMetadata()"><code>DataStore.getMetadata()</code></a></li>
 <li><a href="../metadata/iso/DefaultMetadata.html#deepCopy(org.opengis.metadata.Metadata)"><code>DefaultMetadata.deepCopy(Metadata)</code></a></li>
 </ul>
 </dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="addListener(java.lang.Class,org.apache.sis.storage.event.StoreListener)">
 <h3>addListener</h3>
 <div class="member-signature"><span class="type-parameters">&lt;T extends <a href="event/StoreEvent.html" title="class in org.apache.sis.storage.event">StoreEvent</a>&gt;</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">addListener</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Class.html" title="class or interface in java.lang" class="external-link">Class</a>&lt;T&gt;&nbsp;eventType,
  <a href="event/StoreListener.html" title="interface in org.apache.sis.storage.event">StoreListener</a>&lt;? super T&gt;&nbsp;listener)</span></div>
 <div class="block">Registers a listener to notify when the specified kind of event occurs in this resource or in children.
  The resource will call the <a href="event/StoreListener.html#eventOccured(E)"><code>StoreListener.eventOccured(StoreEvent)</code></a> method when new events matching
  the <code>eventType</code> occur. An event may be a change in resource content or structure, or a warning that
  occurred during a read or write operation.

  <p>Registering a listener for a given <code>eventType</code> also register the listener for all event sub-types.
  The same listener can be registered many times, but its <a href="event/StoreListener.html#eventOccured(E)"><code>StoreListener.eventOccured(StoreEvent)</code></a>
  method will be invoked only once per event. This filtering applies even if the listener is registered
  on different resources in the same tree, for example a parent and its children.</p>

  <p>If this resource may produce events of the given type, then the given listener is kept by strong reference;
  it will not be garbage collected unless <a href="#removeListener(java.lang.Class,org.apache.sis.storage.event.StoreListener)">explicitly removed</a>
  or unless this <code>Resource</code> is itself garbage collected. However if the given type of events can never
  happen with this resource, then this method is not required to keep a reference to the given listener.</p>

  <h4>Warning events</h4>
  If <code>eventType</code> is assignable from <code><a href="event/WarningEvent.html" title="class in org.apache.sis.storage.event">WarningEvent</a>.class</code>,
  then registering that listener turns off logging of warning messages for this resource.
  This side-effect is applied on the assumption that the registered listener will handle
  warnings in its own way, for example by showing warnings in a widget.</div>
 <dl class="notes">
 <dt>Type Parameters:</dt>
 <dd><code>T</code> - compile-time value of the <code>eventType</code> argument.</dd>
 <dt>Parameters:</dt>
 <dd><code>eventType</code> - type of <a href="event/StoreEvent.html" title="class in org.apache.sis.storage.event"><code>StoreEvent</code></a>s to listen (cannot be <code>null</code>).</dd>
 <dd><code>listener</code> - listener to notify about events.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="removeListener(java.lang.Class,org.apache.sis.storage.event.StoreListener)">
 <h3>removeListener</h3>
 <div class="member-signature"><span class="type-parameters">&lt;T extends <a href="event/StoreEvent.html" title="class in org.apache.sis.storage.event">StoreEvent</a>&gt;</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">removeListener</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Class.html" title="class or interface in java.lang" class="external-link">Class</a>&lt;T&gt;&nbsp;eventType,
  <a href="event/StoreListener.html" title="interface in org.apache.sis.storage.event">StoreListener</a>&lt;? super T&gt;&nbsp;listener)</span></div>
 <div class="block">Unregisters a listener previously added to this resource for the given type of events.
  The <code>eventType</code> must be the exact same class than the one given to the <code>addListener(…)</code> method;
  this method does not remove listeners registered for subclasses and does not remove listeners registered in
  parent resources.

  <p>If the same listener has been registered many times for the same even type, then this method removes only
  the most recent registration. In other words if <code>addListener(type, ls)</code> has been invoked twice, then
  <code>removeListener(type, ls)</code> needs to be invoked twice in order to remove all instances of that listener.
  If the given listener is not found, then this method does nothing (no exception is thrown).</p>

  <h4>Warning events</h4>
  If <code>eventType</code> is <code><a href="event/WarningEvent.html" title="class in org.apache.sis.storage.event">WarningEvent</a>.class</code>
  and if, after this method invocation, there are no remaining listeners for warning events,
  then this <code>Resource</code> will send future warnings to the loggers.</div>
 <dl class="notes">
 <dt>Type Parameters:</dt>
 <dd><code>T</code> - compile-time value of the <code>eventType</code> argument.</dd>
 <dt>Parameters:</dt>
 <dd><code>eventType</code> - type of <a href="event/StoreEvent.html" title="class in org.apache.sis.storage.event"><code>StoreEvent</code></a>s which were listened (cannot be <code>null</code>).</dd>
 <dd><code>listener</code> - listener to stop notifying about events.</dd>
 </dl>
 </section>
 </li>
 </ul>
 </section>
 </li>
 </ul>
 </section>
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