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• oshdb-database-driver
• 1.2.3
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• Util.java

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org.heigit.ohsome.oshdb.helpers.db.Util Maven / Gradle / Ivy

package org.heigit.ohsome.oshdb.helpers.db;

import java.util.Optional;
import java.util.Properties;
import java.util.regex.Pattern;

class Util {

  private static final Pattern SUBSTITUTE = Pattern.compile("\\$\\{([^\\}]+)\\}");

  private Util() {}

  static Optional getInterpolated(Properties props, String key) {
    return Optional.ofNullable(props.getProperty(key)).map(value -> interpolate(props, value));
  }

  private static String interpolate(Properties props, String value) {
    var matcher = SUBSTITUTE.matcher(value);
    var sb = new StringBuffer();
    while (matcher.find()) {
      var sub = matcher.group(1);
      matcher.appendReplacement(sb, getInterpolated(props, sub).orElse("\\${" + sub + "}"));
    }
    matcher.appendTail(sb);
    return sb.toString();
  }
}