fixed potential StringIndexOutOfBoundsExceptions (#14000)

fixed compiler warnings

Signed-off-by: Michael Weger <weger.michael@gmx.net>

diff --git a/bundles/org.openhab.binding.airq/src/main/java/org/openhab/binding/airq/internal/AirqHandler.java b/bundles/org.openhab.binding.airq/src/main/java/org/openhab/binding/airq/internal/AirqHandler.java
index 6eca67a8524a7b882b05e1ccf08bc396bce99c4a..2ceccd6c99573601e5259e252090eda938211175 100644 (file)
--- a/bundles/org.openhab.binding.airq/src/main/java/org/openhab/binding/airq/internal/AirqHandler.java
+++ b/bundles/org.openhab.binding.airq/src/main/java/org/openhab/binding/airq/internal/AirqHandler.java
@@ -268,7 +268,7 @@ public class AirqHandler extends BaseThingHandler {
                     break;
                 case "logLevel":
                     String ll = command.toString();
-                    if (ll.equals("Error") || ll.equals("Warning") || ll.equals("Info")) {
+                    if ("Error".equals(ll) || "Warning".equals(ll) || "Info".equals(ll)) {
                         newobj.addProperty("logging", ll);
                         changeSettings(newobj);
                     } else {
@@ -288,7 +288,7 @@ public class AirqHandler extends BaseThingHandler {
                     break;
                 case "powerFreqSuppression":
                     String newFreq = command.toString();
-                    if (newFreq.equals("50Hz") || newFreq.equals("60Hz") || newFreq.equals("50Hz+60Hz")) {
+                    if ("50Hz".equals(newFreq) || "60Hz".equals(newFreq) || "50Hz+60Hz".equals(newFreq)) {
                         newobj.addProperty("Rejection", newFreq);
                         changeSettings(newobj);
                     } else {
@@ -710,7 +710,12 @@ public class AirqHandler extends BaseThingHandler {
                         for (JsonElement el : arr) {
                             str.append(el.getAsString() + ", ");
                         }
-                        updateState(channelName, new StringType(str.substring(0, str.length() - 2)));
+                        if (str.length() >= 2) {
+                            updateState(channelName, new StringType(str.substring(0, str.length() - 2)));
+                        } else {
+                            logger.trace("air-Q - airqHandler - processType(): cannot handle this as an array: {}",
+                                    jsonarr);
+                        }
                     } else {
                         logger.warn("air-Q - airqHandler - processType(): cannot handle this as an array: {}", jsonarr);
                     }
@@ -730,7 +735,13 @@ public class AirqHandler extends BaseThingHandler {
                             str = str + attributeName + ": offset=" + attributeValue.get("offset").getAsString() + " ["
                                     + timecalibString + "]";
                         }
-                        updateState(channelName, new StringType(str.substring(0, str.length() - 1)));
+                        if (!str.isEmpty()) {
+                            updateState(channelName, new StringType(str.substring(0, str.length() - 1)));
+                        } else {
+                            logger.trace(
+                                    "air-Q - airqHandler - processType(): Cannot extract calibration data from this string: {}",
+                                    dec.get(airqName).toString());
+                        }
                     } else {
                         logger.warn(
                                 "air-Q - airqHandler - processType(): Cannot extract calibration data from this string: {}",
@@ -749,9 +760,14 @@ public class AirqHandler extends BaseThingHandler {
                         for (JsonElement el : arr) {
                             arrstr = arrstr + el.getAsString() + ", ";
                         }
-                        logger.trace("air-Q - airqHandler - processType(): property array {} set to {}", channelName,
-                                arrstr.substring(0, arrstr.length() - 2));
-                        getThing().setProperty(channelName, arrstr.substring(0, arrstr.length() - 2));
+                        if (arrstr.length() >= 2) {
+                            logger.trace("air-Q - airqHandler - processType(): property array {} set to {}",
+                                    channelName, arrstr.substring(0, arrstr.length() - 2));
+                            getThing().setProperty(channelName, arrstr.substring(0, arrstr.length() - 2));
+                        } else {
+                            logger.trace("air-Q - airqHandler - processType(): cannot handle this as an array: {}",
+                                    proparr);
+                        }
                     } else {
                         logger.warn("air-Q - airqHandler - processType(): cannot handle this as an array: {}", proparr);
                     }