Object Storage Service:MetaSearch (OSS SDK for Java 1.0)

import com.aliyun.oss.*;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.common.comm.SignVersion;
import com.aliyun.oss.model.MetaQueryMode;

public class OpenMetaQuery {
    public static void main(String[] args) throws com.aliyuncs.exceptions.ClientException {
        // In this example, the endpoint of the China (Hangzhou) region is used.
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // Specify the name of the bucket. Example: examplebucket.
        String bucketName = "examplebucket";
        // Obtain access credentials from environment variables. 
        // Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured.
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou.
        String region = "cn-hangzhou";

        // Create an OSSClient instance.
        //Call the shutdown method to release associated resources when the OSSClient instance is no longer used.
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);
        OSS ossClient = OSSClientBuilder.create()
                .endpoint(endpoint)
                .credentialsProvider(credentialsProvider)
                .clientConfiguration(clientBuilderConfiguration)
                .region(region)
                .build();

        try {
            // Enable the MetaSearch feature.
            ossClient.openMetaQuery(bucketName);
        } catch (OSSException oe) {
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Error Message: " + ce.getMessage());
        } finally {
            // Shut down the OSSClient instance.
            if(ossClient != null){
                ossClient.shutdown();
            }
        }
    }
}

import com.aliyun.oss.*;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.common.comm.SignVersion;
import com.aliyun.oss.model.GetMetaQueryStatusResult;

public class GetMetaQueryStatus {
    public static void main(String[] args) throws com.aliyuncs.exceptions.ClientException {
        // In this example, the endpoint of the China (Hangzhou) region is used.
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // Specify the name of the bucket. Example: examplebucket.
        String bucketName = "examplebucket";
        // Obtain access credentials from environment variables. 
        // Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured.
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou.
        String region = "cn-hangzhou";

        // Create an OSSClient instance.
        // Call the shutdown method to release associated resources when the OSSClient instance is no longer used.
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);
        OSS ossClient = OSSClientBuilder.create()
                .endpoint(endpoint)
                .credentialsProvider(credentialsProvider)
                .clientConfiguration(clientBuilderConfiguration)
                .region(region)
                .build();

        try {
            // Query information about the metadata index library of the bucket.
            GetMetaQueryStatusResult getResult = ossClient.getMetaQueryStatus(bucketName);
            // Query the scan type.
            System.out.println(getResult.getPhase());
            // Query the status of the metadata index library.
            System.out.println(getResult.getState());
            // Query the time when the metadata index library was created.
            System.out.println(getResult.getCreateTime());
            // Query the time when the metadata index library was last updated.
            System.out.println(getResult.getUpdateTime());
        } catch (OSSException oe) {
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Error Message: " + ce.getMessage());
        } finally {
            // Shut down the OSSClient instance.
            if(ossClient != null){
                ossClient.shutdown();
            }
        }
    }
}

import com.aliyun.oss.*;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.common.comm.SignVersion;
import com.aliyun.oss.model.*;
import java.util.ArrayList;
import java.util.List;

public class DoMetaQuery {
    public static void main(String[] args) throws Exception {
        // In this example, the endpoint of the China (Hangzhou) region is used.
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // Specify the name of the bucket. Example: examplebucket.
        String bucketName = "examplebucket";
        // Obtain access credentials from environment variables. 
        // Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured.
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou.
        String region = "cn-hangzhou";

        // Create an OSSClient instance.
        // Call the shutdown method to release associated resources when the OSSClient instance is no longer used.
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);
        OSS ossClient = OSSClientBuilder.create()
                .endpoint(endpoint)
                .credentialsProvider(credentialsProvider)
                .clientConfiguration(clientBuilderConfiguration)
                .region(region)
                .build();

        try {
            // Query objects that meet specific conditions and return objects based on specific fields and in the specified sorting order.
            int maxResults = 20;
            // Query objects that are smaller than 1,048,576 bytes in size, return up to 20 objects at a time, and sort the objects in ascending order.
            String query = "{\"Field\": \"Size\",\"Value\": \"1048576\",\"Operation\": \"lt\"}";
            String sort = "Size";
            DoMetaQueryRequest doMetaQueryRequest = new DoMetaQueryRequest(bucketName, maxResults, query, sort);
            Aggregation aggregationRequest = new Aggregation();
            Aggregations aggregations = new Aggregations();
            List<Aggregation> aggregationList = new ArrayList<Aggregation>();
            // Specify the name of the field that is used in the aggregate operation.
            aggregationRequest.setField("Size");
            // Specify the operator that is used in the aggregate operation. max indicates the maximum value.
            aggregationRequest.setOperation("max");
            aggregationList.add(aggregationRequest);
            aggregations.setAggregation(aggregationList);

            // Specify the aggregate operation.
            doMetaQueryRequest.setAggregations(aggregations);
            doMetaQueryRequest.setOrder(SortOrder.ASC);
            DoMetaQueryResult doMetaQueryResult = ossClient.doMetaQuery(doMetaQueryRequest);
            if(doMetaQueryResult.getFiles() != null){
                for(ObjectFile file : doMetaQueryResult.getFiles().getFile()){
                    System.out.println("Filename: " + file.getFilename());
                    // Query the ETag value that is used to identify the content of the object.
                    System.out.println("ETag: " + file.getETag());
                    // Query the access control list (ACL) of the object.
                    System.out.println("ObjectACL: " + file.getObjectACL());
                    // Query the type of the object.
                    System.out.println("OssObjectType: " + file.getOssObjectType());
                    // Query the storage class of the object.
                    System.out.println("OssStorageClass: " + file.getOssStorageClass());
                    // Query the number of tags of the object.
                    System.out.println("TaggingCount: " + file.getOssTaggingCount());
                    if(file.getOssTagging() != null){
                        for(Tagging tag : file.getOssTagging().getTagging()){
                            System.out.println("Key: " + tag.getKey());
                            System.out.println("Value: " + tag.getValue());
                        }
                    }
                    if(file.getOssUserMeta() != null){
                        for(UserMeta meta : file.getOssUserMeta().getUserMeta()){
                            System.out.println("Key: " + meta.getKey());
                            System.out.println("Value: " + meta.getValue());
                        }
                    }
                }
            } else if(doMetaQueryResult.getAggregations() != null){
                for(Aggregation aggre : doMetaQueryResult.getAggregations().getAggregation()){
                    // Query the field by which the aggregation is performed.
                    System.out.println("Field: " + aggre.getField());
                    // Query the aggregation operator.
                    System.out.println("Operation: " + aggre.getOperation());
                    // Query the result of the aggregate operation.
                    System.out.println("Value: " + aggre.getValue());
                    if(aggre.getGroups() != null && aggre.getGroups().getGroup().size() > 0){
                        // Query the value of the aggregation.
                        System.out.println("Groups value: " + aggre.getGroups().getGroup().get(0).getValue());
                        // Query the total number of the aggregations.
                        System.out.println("Groups count: " + aggre.getGroups().getGroup().get(0).getCount());
                    }
                }
            } else {
                System.out.println("NextToken: " + doMetaQueryResult.getNextToken());
            }
        } catch (OSSException oe) {
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Error Message: " + ce.getMessage());
        } finally {
            // Shut down the OSSClient instance.
            ossClient.shutdown();
        }
    }
}

import com.aliyun.oss.*;
import com.aliyun.oss.common.auth.*;
import com.aliyun.oss.common.comm.SignVersion;

public class CloseMetaQuery {
    public static void main(String[] args) throws Exception {
        // In this example, the endpoint of the China (Hangzhou) region is used.
        String endpoint = "https://oss-cn-hangzhou.aliyuncs.com";
        // Specify the name of the bucket. Example: examplebucket.
        String bucketName = "examplebucket";
        // Obtain access credentials from environment variables. 
        // Before you run the sample code, make sure that the OSS_ACCESS_KEY_ID and OSS_ACCESS_KEY_SECRET environment variables are configured.
        EnvironmentVariableCredentialsProvider credentialsProvider = CredentialsProviderFactory.newEnvironmentVariableCredentialsProvider();
        // Specify the region in which the bucket is located. For example, if the bucket is located in the China (Hangzhou) region, set the region to cn-hangzhou.
        String region = "cn-hangzhou";

        // Create an OSSClient instance.
        // Call the shutdown method to release associated resources when the OSSClient instance is no longer used.
        ClientBuilderConfiguration clientBuilderConfiguration = new ClientBuilderConfiguration();
        clientBuilderConfiguration.setSignatureVersion(SignVersion.V4);
        OSS ossClient = OSSClientBuilder.create()
                .endpoint(endpoint)
                .credentialsProvider(credentialsProvider)
                .clientConfiguration(clientBuilderConfiguration)
                .region(region)
                .build();

        try {
            // Disable the MetaSearch feature for the bucket.
            ossClient.closeMetaQuery(bucketName);
        } catch (OSSException oe) {
            System.out.println("Error Message:" + oe.getErrorMessage());
            System.out.println("Error Code:" + oe.getErrorCode());
            System.out.println("Request ID:" + oe.getRequestId());
            System.out.println("Host ID:" + oe.getHostId());
        } catch (ClientException ce) {
            System.out.println("Error Message: " + ce.getMessage());
        } finally {
            // Shut down the OSSClient instance.
            if(ossClient != null){
                ossClient.shutdown();
            }
        }
    }
}