Composite key generator : java

maven dependencies

<dependency>
    <groupId>commons-lang</groupId>
    <artifactId>commons-lang</artifactId>
    <version>2.6</version>
</dependency>

CompositeKeyGenerator.java

package com.blogspot.na5cent.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.lang.StringUtils;

/**
 *
 * @author redcrow
 */
public class CompositeKeyGenerator {

    private static final String KEY_PATTERN = "\\{\\s*(.*?)\\s*\\}";
    private static final String KEY_SPLITOR = ":";

    public static String generateKey(String prefixName, String... keys) {
        return prefixName + "{" + StringUtils.join(keys, KEY_SPLITOR) + "}";
    }

    private static String selectKey(String text) {
        Pattern patternCompile = Pattern.compile(KEY_PATTERN);
        Matcher matcher = patternCompile.matcher(text);
        if (!matcher.find()) {
            return text;
        }

        return matcher.group(1);
    }

    public static String getKeyIndex(String key, int index) {
        return StringUtils.split(selectKey(key), KEY_SPLITOR)[index];
    }
}

CompositeKeyGeneratorTest.java

package com.blogspot.na5cent.util.test;

import org.junit.Test;
import static org.junit.Assert.*;
import com.blogspot.na5cent.util.CompositeKeyGenerator;

/**
 *
 * @author redcrow
 */
public class CompositeKeyGeneratorTest {

    @Test
    public void test() {
        String KEY = "PersonnelInfo{10666:1.2.3.4}";
        assertEquals(KEY, CompositeKeyGenerator.generateKey("PersonnelInfo", "10666", "1.2.3.4"));
        assertEquals("10666", CompositeKeyGenerator.getKeyIndex(KEY, 0));
        assertEquals("1.2.3.4", CompositeKeyGenerator.getKeyIndex(KEY, 1));
    }
}

Example to use
ServiceInfoPK.java

package com.blogspot.na5cent.model.pk;

import java.io.Serializable;
import java.util.Objects;
import javax.persistence.Column;
import javax.persistence.Embeddable;
import com.blogspot.na5cent.util.CompositeKeyGenerator;

/**
 *
 * @author redcrow
 */
@Embeddable
public class ServiceInfoPK implements Serializable {

    @Column(name = "hcode")
    private String hcode;
    @Column(name = "service_id")
    private String serviceId;

    public ServiceInfoPK() {
    }

    public ServiceInfoPK(String pk) {
        this.hcode = CompositeKeyGenerator.getKeyIndex(pk, 0);
        this.serviceId = CompositeKeyGenerator.getKeyIndex(pk, 1);
    }

    public ServiceInfoPK(String hcode, String serviceId) {
        this.hcode = hcode;
        this.serviceId = serviceId;
    }

    public String getHcode() {
        return hcode;
    }

    public void setHcode(String hcode) {
        this.hcode = hcode;
    }

    public String getServiceId() {
        return serviceId;
    }

    public void setServiceId(String serviceId) {
        this.serviceId = serviceId;
    }

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 41 * hash + Objects.hashCode(this.hcode);
        hash = 41 * hash + Objects.hashCode(this.serviceId);
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final ServiceInfoPK other = (ServiceInfoPK) obj;
        if (!Objects.equals(this.hcode, other.hcode)) {
            return false;
        }
        if (!Objects.equals(this.serviceId, other.serviceId)) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return CompositeKeyGenerator.generateKey("ServiceInfo", hcode, serviceId);
    }

}