Tilman
119 lines
3.8 KiB
Java
119 lines
3.8 KiB
Java
/* Copyright (c) 2006 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package sample.gbase.cmdline;
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import com.google.api.gbase.client.AttributeHistogram;
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import com.google.api.gbase.client.GoogleBaseEntry;
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import com.google.api.gbase.client.GoogleBaseFeed;
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import com.google.api.gbase.client.GoogleBaseQuery;
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import com.google.api.gbase.client.MetadataEntryExtension;
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import com.google.api.gbase.client.AttributeHistogram.UniqueValue;
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import com.google.gdata.util.ServiceException;
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import java.io.IOException;
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import java.net.URL;
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/**
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* This class demonstrates how to retrieve Google Base metadata
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* using the client library of the Google Base data API.
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*
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* The tool implemented by this class will connect to Google Base,
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* run the request and display some results.
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*/
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public class MetadataExample extends Example {
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/**
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* Runs the example.
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*/
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public static void main(String[] args) throws IOException, ServiceException {
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String queryString = null;
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args = init(args, "Google-MetadataExample-1.0");
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// Process command-line arguments
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if (args.length == 1) {
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queryString = args[0];
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} else {
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System.err.println("Invalid argument count.");
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System.err.println("Expected one argument:");
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System.err.println(" query");
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System.exit(1);
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}
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queryMetadata(queryString);
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}
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/**
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* Retrieves and prints the list of the most used attributes used by
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* the items that match a query.
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*
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* @param queryString a Google Base Query Language query
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*/
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private static void queryMetadata(String queryString)
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throws IOException, ServiceException {
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// Create a query URL from the given arguments
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URL url = urlFactory.getAttributesFeedURL();
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GoogleBaseQuery query = new GoogleBaseQuery(url);
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query.setGoogleBaseQuery(queryString);
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// Display the URL generated by the API
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System.out.println("Sending request to: " + query.getUrl());
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try {
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GoogleBaseFeed feed = service.query(query);
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// Print the items
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printMetadataFeed(feed);
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} catch (ServiceException e) {
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printServiceException(e);
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}
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}
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/**
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* Prints each metadata item in the feed to the output.
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* Uses {@link #printMetadataEntry(GoogleBaseEntry)}.
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*
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* @param feed a Google Base data API metadata feed
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*/
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private static void printMetadataFeed(GoogleBaseFeed feed) {
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if (feed.getTotalResults() == 0) {
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System.out.println("No matches.");
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return;
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}
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for (GoogleBaseEntry entry : feed.getEntries()) {
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printMetadataEntry(entry);
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}
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}
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/**
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* Prints a few relevant attributes and the values of the attribute histogram
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* of a metadata GoogleBaseEntry item.
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*
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* @param entry a Google Base data API metadata entry
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*/
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private static void printMetadataEntry(GoogleBaseEntry entry) {
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MetadataEntryExtension metadata = entry.getGoogleBaseMetadata();
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AttributeHistogram attributeHistogram = metadata.getAttributeHistogram();
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System.out.println(attributeHistogram.getAttributeName() +
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" (" + attributeHistogram.getAttributeType().getName() + "): " +
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"valueCount=" + attributeHistogram.getTotalValueCount() + " - " +
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entry.getId());
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for (UniqueValue value : attributeHistogram.getValues()) {
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System.out.println(value.getValueAsString() +
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" count=" + value.getCount());
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}
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}
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}
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