Java Graph.match方法代码示例

import org.openrdf.model.Graph; //导入方法依赖的package包/类
private void updateMetadataGraph(INamedGraphWithMetaData graph, File metaGraphFile) throws AnzoIoException {
    INamedGraph metaGraph = null ;
    try {
        metaGraph = graph.getMetaDataGraph() ;
        Graph metaFile = loadGraph(metaGraphFile) ;
        URI newAcl = GraphUtil.getUniqueObjectURI(metaFile, graph.getNamedGraphUri(), uri(AnzoPredicates.USES_ACL)) ;
        AnzoFactory.createACL(newAcl, metaGraph) ;
        Iterator<Statement> acl = metaFile.match(newAcl, null, null) ;
        while (acl.hasNext()) {
            metaGraph.add(acl.next()) ;
        }
        metaGraph.add(graph.getNamedGraphUri(), uri(AnzoPredicates.USES_ACL), newAcl) ;
    } catch (GraphUtilException e) {
        throw new AnzoIoException("Unable to retrieve new ACL from meta graph file: " + metaGraphFile.getPath() + ".", e) ;
    } finally {
        if (metaGraph == null) {
            metaGraph.close() ;
        }
    }
}
 

import org.openrdf.model.Graph; //导入方法依赖的package包/类
/**
	 * Returns the object URI of the setting with the specified property.
	 * 
	 * @param config the configuration settings.
	 * @param subject the subject (sub context) of the configuration setting.
	 * @param property the configuration property.
	 * @return the URI value of the desired property setting or null.
	 * @throws SailConfigException if there is no (single) URI to return.
	 */
	protected URI getObjectURI(Graph config, Resource subject, URI property) throws RepositoryConfigException {
		Iterator<Statement> objects = config.match(subject, property, null);
		if (!objects.hasNext())
			return null;
//			throw new RepositoryConfigException("found no settings for property " + property);
		Statement st = objects.next();
		if (objects.hasNext())
			throw new RepositoryConfigException("found multiple settings for property " + property);
		Value object = st.getObject();
		if (object instanceof URI)
			return (URI) object;
		else
			throw new RepositoryConfigException("property value is not a URI: " + property + " " + object); 
	}
 

import org.openrdf.model.Graph; //导入方法依赖的package包/类
/**
 * Returns the literal value of the triple's object matching the predicate.
 * 
 * @param model the model of the configuration settings.
 * @param implNode the model representing a configuration setting.
 * @param predicate the predicate defining a configuration attribute.
 * @return the literal value of the object or null.
 * @throws SailConfigException if there is no literal to return.
 */
protected Literal getObjectLiteral(Graph model, Resource implNode, URI property) throws SailConfigException {
	Iterator<Statement> objects = model.match(implNode, property, null);
	if (!objects.hasNext())
		return null;
	Statement st = objects.next();
	if (objects.hasNext())
		throw new SailConfigException("found multiple object values for " + property);
	Value object = st.getObject();
	if (object instanceof Literal)
		return (Literal) object;
	else
		throw new SailConfigException("object value is not a Literal: " + property + " " + object); 
}
 

import org.openrdf.model.Graph; //导入方法依赖的package包/类
/**
	 * Returns the object resource of the triple matching the supplied predicate.
	 * 
	 * @param model the model of the configuration settings.
	 * @param implNode the model representing a configuration setting.
	 * @param predicate the predicate defining a configuration attribute.
	 * @return the resource representing the configuration attribute or null.
	 * @throws SailConfigException if there is no (single) resource to return.
	 */
	protected Resource getObjectResource(Graph model, Resource implNode, URI predicate) throws SailConfigException {
		Iterator<Statement> objects = model.match(implNode, predicate, null);
		if (!objects.hasNext())
			return null;
//			throw new SailConfigException("found no object value for " + predicate);
		Statement st = objects.next();
		if (objects.hasNext())
			throw new SailConfigException("found multiple object values for " + predicate);
		Value object = st.getObject();
		if (object instanceof Resource)
			return (Resource) object;
		else
			throw new SailConfigException("object value is not a Resource: " + predicate + " " + object); 
	}
 

import org.openrdf.model.Graph; //导入方法依赖的package包/类
/**
	 * Helper method to extract a configuration's sub setting.
	 * 
	 * @param model the configuration model
	 * @param implNode node representing a specific configuration context.
	 * @param option configuration option to look for
	 * @return set of found values for the configuration setting.
	 */
//	protected Set<Value> filter(Model model, Resource implNode, URI option) { // Sesame 3
	protected Set<Value> filter(Graph model, Resource implNode, URI option) { // Sesame 2
//		return model.filter(implNode, MEMBER, null).objects(); // Sesame 3
		// Sesame 2:
		Set<Value> values = new HashSet<Value>();
		Iterator<Statement> objects = model.match(implNode, option, null);
		while (objects.hasNext()) {
			values.add(objects.next().getObject());
		}
		return values;
	}