Java ResultIterator.hasNext方法代码示例

import com.buschmais.xo.api.ResultIterator; //导入方法依赖的package包/类
/**
    * This method adds a new content tree node or content tree part to the
    * database.
    * 
    * @param xoManager
    *            is the {@link XOManager} to use for graph access.
    * @param fileTree
    *            is the run tree to add.
    * @param analysisRunVertex
    *            is the run vertex to add the tree to.
    * @throws AnalysisStoreException
    *             is thrown in case of analysis store utilities.
    * @throws IOException
    *             is thrown in case of IO issues.
    */
   public void addContentTree(XOManager xoManager, AnalysisRunFileTree fileTree, AnalysisRunVertex analysisRunVertex)
    throws AnalysisStoreException, IOException {
ResultIterable<ContentTreeRootVertex> contentRootResult = xoManager.find(ContentTreeRootVertex.class,
	fileTree.getHashId().toString());
ResultIterator<ContentTreeRootVertex> contentRootIterator = contentRootResult.iterator();
if (contentRootIterator.hasNext()) {
    analysisRunVertex.setContentRoot(contentRootIterator.next());
    return;
}
ContentTreeRootVertex contentRoot = xoManager.create(ContentTreeRootVertex.class);
contentRoot.setHashId(fileTree.getHashId().toString());
analysisRunVertex.setContentRoot(contentRoot);
for (AnalysisRunFileTree child : fileTree.getChildren()) {
    if (child.isFile()) {
	addContentTreeFileVertex(xoManager, child, contentRoot);
    } else {
	addContentTreeDirectoryVertex(xoManager, child, contentRoot);
    }
}
   }
 

import com.buschmais.xo.api.ResultIterator; //导入方法依赖的package包/类
@Override
public T getSingleResult() {
    ResultIterator<T> iterator = iterator();
    if (!iterator.hasNext()) {
        throw new XOException("No result available.");
    }
    try {
        T singleResult = iterator.next();
        if (iterator.hasNext()) {
            throw new XOException("More than one result available.");
        }
        return singleResult;
    } finally {
        iterator.close();
    }
}
 

import com.buschmais.xo.api.ResultIterator; //导入方法依赖的package包/类
/**
    * This method looks a specific Analysis Project vertex up in the graph db.
    * 
    * @param xoManager
    *            is the {@link XOManager} to use for graph access.
    * @param projectId
    *            is the id of the project.
    * @return An {@link AnalysisProjectVertex} is returned.
    * @throws AnalysisStoreException
    *             is thrown in case of analysis store issues.
    */
   public static AnalysisProjectVertex findAnalysisProjectVertex(XOManager xoManager, String projectId)
    throws AnalysisStoreException {
ResultIterable<AnalysisProjectVertex> result = xoManager.find(AnalysisProjectVertex.class, projectId);
ResultIterator<AnalysisProjectVertex> iterator = result.iterator();
if (!iterator.hasNext()) {
    throw new AnalysisStoreException("Could not find a project with identifier '" + projectId + "'.");
}
AnalysisProjectVertex analysisProject = iterator.next();
if (iterator.hasNext()) {
    throw new AnalysisStoreException(
	    "Multiple projects with identifier '" + projectId + "' were found. Database is inconsistent.");
}
return analysisProject;
   }
 

import com.buschmais.xo.api.ResultIterator; //导入方法依赖的package包/类
@Override
public <D, T> ResultIterable<T> toResult(ResultIterator<D> iterator) {
    ResultIterator<T> resultIterator = new ResultIterator<T>() {

        @Override
        public boolean hasNext() {
            return iterator.hasNext();
        }

        @Override
        public T next() {
            Object datastoreValue = iterator.next();
            return fromDatastore(datastoreValue);
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException("Cannot remove instance.");
        }

        @Override
        public void close() {
            iterator.close();
        }
    };
    XOTransaction xoTransaction = sessionContext.getXOTransaction();
    final ResultIterator<T> transactionalIterator = xoTransaction != null ? new TransactionalResultIterator<>(resultIterator, xoTransaction)
            : resultIterator;
    return sessionContext.getInterceptorFactory().addInterceptor(new AbstractResultIterable<T>() {
        @Override
        public ResultIterator<T> iterator() {
            return transactionalIterator;
        }
    }, ResultIterable.class);
}