[#1] add client environment

add client cut
code cleanup
Signed-off-by: Ori Bruk <o.bruk@yadro.com>

client/src/main/java/info/FrostFS/sdk/tools/ClientSettings.java

@@ -0,0 +1,57 @@
+package info.FrostFS.sdk.tools;
+
+import io.grpc.ChannelCredentials;
+import org.apache.commons.lang3.StringUtils;
+
+public class ClientSettings {
+    private static final String ERROR_TEMPLATE = "%s is required parameter.";
+
+    public String key;
+    public String host;
+    public ChannelCredentials creds;
+
+    public ClientSettings(String key, String host) {
+        this.key = key;
+        this.host = host;
+    }
+
+    public ChannelCredentials getCreds() {
+        return creds;
+    }
+
+    public void setCreds(ChannelCredentials creds) {
+        this.creds = creds;
+    }
+
+    public String getHost() {
+        return host;
+    }
+
+    public void setHost(String host) {
+        this.host = host;
+    }
+
+    public String getKey() {
+        return key;
+    }
+
+    public void setKey(String key) {
+        this.key = key;
+    }
+
+    public void validate() {
+        StringBuilder errorMessage = new StringBuilder();
+
+        if (StringUtils.isEmpty(key)) {
+            errorMessage.append(String.format(ERROR_TEMPLATE, "Key")).append(System.lineSeparator());
+        }
+
+        if (StringUtils.isEmpty(host)) {
+            errorMessage.append(String.format(ERROR_TEMPLATE, "Host")).append(System.lineSeparator());
+        }
+
+        if (errorMessage.length() != 0) {
+            throw new IllegalArgumentException(errorMessage.toString());
+        }
+    }
+}