Add command line handler

Added a Handler for command line classes to share common strucutures.

Issue-ID: POLICY-3128
Change-Id: I662911c467faf5c39b8db018bb1a564fba7587a6
Signed-off-by: adheli.tavares <adheli.tavares@est.tech>

2 files changed, 183 insertions, 2 deletions

diff --git a/utils/src/test/java/org/onap/policy/common/utils/cmd/TestCommandLineArguments.java b/utils/src/test/java/org/onap/policy/common/utils/cmd/TestCommandLineArguments.java
new file mode 100644
index 00000000..1501e769
--- /dev/null
+++ b/utils/src/test/java/org/onap/policy/common/utils/cmd/TestCommandLineArguments.java
@@ -0,0 +1,181 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Nordix Foundation.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.utils.cmd;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatCode;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import org.apache.commons.cli.Option;
+import org.apache.commons.cli.Options;
+import org.junit.Test;
+
+public class TestCommandLineArguments {
+    private static final String FAKE_HELP_CLASS = "org.onap.policy.HelpClass";
+    private static final String FAKE_COMPONENT = "fake policy cpm";
+    private static final String TEST_CONFIG_FILE = "cmdFiles/configuration.json";
+    private static final String TEST_PROPERTY_FILE = "cmdFiles/property.json";
+    private static final String ERR_MSG_INVALID_ARGS = "invalid command line arguments specified";
+    private static final String ERR_MSG_POLICY_CONFIG_FILE =
+            "fake policy cpm configuration file was not specified as an argument";
+
+    CommandLineArgumentsHandler testCmd = new CommandLineArgumentsHandler(FAKE_HELP_CLASS, FAKE_COMPONENT);
+
+    @Test
+    public void testVersion() throws CommandLineException {
+        String[] version = {"-v"};
+        assertThat(testCmd.parse(version)).startsWith("ONAP Version test.");
+    }
+
+    @Test
+    public void testHelp() throws CommandLineException {
+        String[] help = {"-h"};
+        assertThat(testCmd.parse(help)).startsWith("usage: org.onap.policy.HelpClass [options...]");
+    }
+
+    @Test
+    public void testParse() throws CommandLineException {
+        String[] args = {"-c", TEST_CONFIG_FILE};
+        testCmd.parse(args);
+
+        assertTrue(testCmd.checkSetConfigurationFilePath());
+        assertThat(testCmd.getFullConfigurationFilePath()).contains(TEST_CONFIG_FILE);
+    }
+
+    @Test
+    public void testParse_ShouldThrowExceptionWithInvalidArguments() {
+        String[] invalidArgs = {"-a"};
+        assertThatThrownBy(() -> testCmd.parse(invalidArgs)).hasMessage(ERR_MSG_INVALID_ARGS)
+                .hasRootCauseMessage("Unrecognized option: -a");
+    }
+
+    @Test
+    public void testParse_ShouldThrowExceptionWithExtraArguments() {
+        String[] remainingArgs = {"-c", TEST_CONFIG_FILE, "extraArgs"};
+        String expectedErrorMsg =
+                "too many command line arguments specified: [-c, cmdFiles/configuration.json, extraArgs]";
+        assertThatThrownBy(() -> testCmd.parse(remainingArgs)).hasMessage(expectedErrorMsg);
+    }
+
+    @Test
+    public void testParse_ShouldThrowExceptionWhenFileNameNull() {
+        String[] nullArgs = {"-c", null};
+        assertThatThrownBy(() -> testCmd.parse(nullArgs)).hasMessage(ERR_MSG_INVALID_ARGS).hasRootCauseMessage(null);
+    }
+
+    @Test
+    public void testValidate() throws CommandLineException {
+        String[] validConfigArgs = {"-c", TEST_CONFIG_FILE};
+        testCmd.parse(validConfigArgs);
+        assertThatCode(() -> testCmd.validate()).doesNotThrowAnyException();
+    }
+
+    @Test
+    public void testValidate_ShouldThrowExceptionWhenConfigFileNotPresent() throws CommandLineException {
+        String[] versionArgs = {"-v"};
+        testCmd.parse(versionArgs);
+        assertValidate(versionArgs, ERR_MSG_POLICY_CONFIG_FILE);
+    }
+
+    @Test
+    public void testValidate_ShouldThrowExceptionWhenFileNameEmpty() {
+        String[] argsOnlyKeyNoValue = {"-c", ""};
+        assertValidate(argsOnlyKeyNoValue, ERR_MSG_POLICY_CONFIG_FILE);
+        assertFalse(testCmd.checkSetConfigurationFilePath());
+    }
+
+    @Test
+    public void testValidate_ShouldThrowExceptionWhenFileNameEmptySpace() {
+        String[] argsOnlyKeyNoValue = {"-c", " "};
+        assertValidate(argsOnlyKeyNoValue, ERR_MSG_POLICY_CONFIG_FILE);
+        assertFalse(testCmd.checkSetConfigurationFilePath());
+    }
+
+    @Test
+    public void testValidate_ShouldThrowExceptionWhenFileNameDoesNotExist() {
+        String[] fileNameNotExistentArgs = {"-c", "someFileName.json"};
+        assertValidate(fileNameNotExistentArgs,
+                "fake policy cpm configuration file \"someFileName.json\" does not exist");
+    }
+
+    @Test
+    public void testValidate_ShouldThrowExceptionWhenFileNameIsNotFile() {
+        String[] folderAsFileNameArgs = {"-c", "src/test/resources"};
+        assertValidate(folderAsFileNameArgs,
+                "fake policy cpm configuration file \"src/test/resources\" is not a normal file");
+    }
+
+    @Test
+    public void testAddExtraOptions() throws CommandLineException {
+        Option extra = Option.builder("p").longOpt("property-file")
+                .desc("the full path to the topic property file to use, the property file contains the "
+                        + FAKE_COMPONENT + " properties")
+                .hasArg().argName("PROP_FILE").required(false).type(String.class).build();
+
+        CommandLineArgumentsHandler testCmdExtraOpt =
+                new CommandLineArgumentsHandler(FAKE_HELP_CLASS, FAKE_COMPONENT, extra);
+
+        String[] args = {"-p", TEST_PROPERTY_FILE};
+        testCmdExtraOpt.parse(args);
+
+        assertTrue(testCmdExtraOpt.checkSetPropertyFilePath());
+        assertThat(testCmdExtraOpt.getFullPropertyFilePath()).contains(TEST_PROPERTY_FILE);
+
+        String[] argsNoProperty = {"-p", ""};
+        testCmdExtraOpt.parse(argsNoProperty);
+
+        assertFalse(testCmdExtraOpt.checkSetPropertyFilePath());
+    }
+
+    @Test
+    public void testNewOptions() throws CommandLineException {
+        Options newOptions = new Options();
+        newOptions.addOption(
+                Option.builder("a").longOpt("fake-option").desc("the fake property to check command line parse")
+                        .hasArg().argName("FAKE_OPT").required(false).type(String.class).build());
+
+        CommandLineArgumentsHandler testCmdExtraOpt =
+                new CommandLineArgumentsHandler(FAKE_HELP_CLASS, FAKE_COMPONENT, newOptions);
+
+        String[] args = {"-a", "aaaa"};
+        testCmdExtraOpt.parse(args);
+
+        assertTrue(testCmdExtraOpt.getCommandLine().hasOption("a"));
+
+        // should raise exception as -c is not present on options;
+        // default options should've been replaced by constructor parameter.
+        String[] argsError = {"-c", "aaaa.json"};
+        assertThatThrownBy(() -> testCmdExtraOpt.parse(argsError)).hasMessage(ERR_MSG_INVALID_ARGS)
+                .hasRootCauseMessage("Unrecognized option: -c");
+    }
+
+    private void assertValidate(String[] testArgs, String expectedErrorMsg) {
+        try {
+            testCmd.parse(testArgs);
+        } catch (CommandLineException e) {
+            fail(e.getMessage());
+        }
+        assertThatThrownBy(() -> testCmd.validate()).hasMessage(expectedErrorMsg);
+    }
+}
diff --git a/utils/src/test/java/org/onap/policy/common/utils/resources/ResourceUtilsTest.java b/utils/src/test/java/org/onap/policy/common/utils/resources/ResourceUtilsTest.java
index 2e122187..6a2fe1ad 100644
--- a/utils/src/test/java/org/onap/policy/common/utils/resources/ResourceUtilsTest.java
+++ b/utils/src/test/java/org/onap/policy/common/utils/resources/ResourceUtilsTest.java
@@ -2,7 +2,7 @@
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2018 Ericsson. All rights reserved.
  *  Modifications Copyright (C) 2019-2020 AT&T Intellectual Property. All rights reserved.
- *  Modifications Copyright (C) 2020 Nordix Foundation.
+ *  Modifications Copyright (C) 2020-2021 Nordix Foundation.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -264,7 +264,7 @@ public class ResourceUtilsTest {
 
         theString = ResourceUtils.getResourceAsString("");
 
-        assertEquals("logback-test.xml\nMETA-INF\norg\ntestdir\n", theString);
+        assertEquals("cmdFiles\nlogback-test.xml\nMETA-INF\norg\ntestdir\nversion.txt\n", theString);
 
     }