org.wso2.carbon.dataservices.core.odata.ODataUtils.java Source code

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Here is the source code for org.wso2.carbon.dataservices.core.odata.ODataUtils.java

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/*
 * Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. licenses this file to you under the Apache License,
 * Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.wso2.carbon.dataservices.core.odata;

import org.apache.commons.codec.binary.Base64;
import org.wso2.carbon.dataservices.common.DBConstants;

import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.UUID;

/**
 * Utility class for OData.
 */
public class ODataUtils {

    /**
     * This method generates an unique ETag for each data row entry.
     *
     * @param tableName Name of the table
     * @param entry     Data row entry
     * @return E Tag
     */
    public static String generateETag(String configID, String tableName, ODataEntry entry) {
        StringBuilder uniqueString = new StringBuilder();
        uniqueString.append(configID).append(tableName);
        for (String columnName : entry.getNames()) {
            uniqueString.append(columnName).append(entry.getValue(columnName));
        }
        return UUID.nameUUIDFromBytes((uniqueString.toString()).getBytes()).toString();
    }

}