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HstoreHelper.java
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HstoreHelper.java
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package net.backtothefront;
import org.springframework.util.StringUtils;
import java.util.HashMap;
import java.util.Map;
// courtesy of: http://backtothefront.net/2011/storing-sets-keyvalue-pairs-single-db-column-hibernate-postgresql-hstore-type/
public class HstoreHelper {
private static final String K_V_SEPARATOR = "=>";
public static String toString(Map<String, String> m) {
if (m.isEmpty()) {
return "";
}
StringBuilder sb = new StringBuilder();
int n = m.size();
for (String key : m.keySet()) {
sb.append("\"" + key + "\"" + K_V_SEPARATOR + "\"" + m.get(key) + "\"");
if (n > 1) {
sb.append(", ");
n--;
}
}
return sb.toString();
}
public static Map<String, String> toMap(String s) {
Map<String, String> m = new HashMap<String, String>();
if (! StringUtils.hasText(s)) {
return m;
}
String[] tokens = s.split(", ");
for (String token : tokens) {
String[] kv = token.split(K_V_SEPARATOR);
String k = kv[0];
k = k.trim().substring(1, k.length() - 1);
String v = kv[1];
v = v.trim().substring(1, v.length() - 1);
m.put(k, v);
}
return m;
}
}