com.busimu.core.license.LicenseGenerator.java Source code

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Here is the source code for com.busimu.core.license.LicenseGenerator.java

Source

package com.busimu.core.license;

import java.util.HashSet;
import java.util.Set;

import org.springframework.beans.factory.annotation.Required;

import com.busimu.core.dao.UserMngDaoPolicy;
import com.busimu.core.model.License;

public class LicenseGenerator {

    private static LicenseGenerator instance;

    //   private Log log = LogFactory.getLog(LicenseGenerator.class);

    private UserMngDaoPolicy policy;

    public void init() {
        instance = this;
    }

    /**
      * @param policy the policy to set
      */
    @Required
    public void setUserMngDaoPolicy(UserMngDaoPolicy policy) {
        this.policy = policy;
    }

    public static LicenseGenerator getInstance() {
        return instance;
    }

    public StringBuffer getLicenses(int number, License.Type type) {
        Set<License> generatedLicenses = new HashSet<License>();
        StringBuffer licenses = new StringBuffer();
        int i = 0;
        while (i < number) {
            String licenseCode = generateLicenseCode();
            if (policy.isExistedLicense(licenseCode) || generatedLicenses.contains(licenseCode)) {
                continue;
            }
            generatedLicenses.add(new License(licenseCode, type));
            licenses.append(licenseCode);
            licenses.append("\r\n");
            i++;
        }
        policy.storeLicenses(generatedLicenses);
        return licenses;
    }

    private String generateLicenseCode() {
        String licenseCode = "";
        for (int i = 0; i < 16; i++) {
            int index = (int) (Math.random() * 62);
            if (index < 10) {
                licenseCode += (char) (index + '0');
            } else if (index < 36) {
                licenseCode += (char) (index + 'A' - 10);
            } else if (index < 62) {
                licenseCode += (char) (index + 'a' - 36);
            } else {
                throw new RuntimeException("Wrong Index " + index);
            }
            if (i % 4 == 3 && i != 15) {
                licenseCode += '-';
            }
        }
        return licenseCode;
    }
}