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authoradheli.tavares <adheli.tavares@est.tech>2021-04-09 11:51:05 +0100
committeradheli.tavares <adheli.tavares@est.tech>2021-04-13 13:38:54 +0100
commit1cb818e3cbd6154762f908be8698317fa10fbc49 (patch)
tree3d6b5e5d3d3071d13a29485a63f7c42b8b6edd6e /utils/src/main
parent04623fef95f2b164d79ad48de2ef3708d02eda80 (diff)
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>
Diffstat (limited to 'utils/src/main')
-rw-r--r--utils/src/main/java/org/onap/policy/common/utils/cmd/CommandLineArgumentsHandler.java273
-rw-r--r--utils/src/main/java/org/onap/policy/common/utils/cmd/CommandLineException.java54
2 files changed, 327 insertions, 0 deletions
diff --git a/utils/src/main/java/org/onap/policy/common/utils/cmd/CommandLineArgumentsHandler.java b/utils/src/main/java/org/onap/policy/common/utils/cmd/CommandLineArgumentsHandler.java
new file mode 100644
index 00000000..37a9047b
--- /dev/null
+++ b/utils/src/main/java/org/onap/policy/common/utils/cmd/CommandLineArgumentsHandler.java
@@ -0,0 +1,273 @@
+/*-
+ * ============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 java.io.PrintWriter;
+import java.io.StringWriter;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Arrays;
+import lombok.Getter;
+import lombok.Setter;
+import org.apache.commons.cli.CommandLine;
+import org.apache.commons.cli.DefaultParser;
+import org.apache.commons.cli.HelpFormatter;
+import org.apache.commons.cli.Option;
+import org.apache.commons.cli.Options;
+import org.apache.commons.cli.ParseException;
+import org.apache.commons.lang3.StringUtils;
+import org.onap.policy.common.utils.resources.ResourceUtils;
+
+/**
+ * Class for command line common processing.
+ *
+ * @author Adheli Tavares (adheli.tavares@est.tech)
+ *
+ */
+public class CommandLineArgumentsHandler {
+ private static final String FILE_MESSAGE_PREAMBLE = " file \"";
+ private static final int HELP_LINE_LENGTH = 120;
+
+ private final Options options;
+
+ private final String helpClassName;
+ private final String component;
+
+ @Getter
+ @Setter
+ private String configurationFilePath = null;
+
+ @Getter
+ @Setter
+ private String propertyFilePath = null;
+
+ @Getter
+ private CommandLine commandLine = null;
+
+ /**
+ * Construct the options with default values for the CLI editor.
+ */
+ protected CommandLineArgumentsHandler(String helpClassName, String component) {
+ this.helpClassName = helpClassName;
+ this.component = component;
+ //@formatter:off
+ options = new Options();
+ options.addOption(Option.builder("h")
+ .longOpt("help")
+ .desc("outputs the usage of this command")
+ .required(false)
+ .type(Boolean.class)
+ .build());
+ options.addOption(Option.builder("v")
+ .longOpt("version")
+ .desc("outputs the version of " + this.component)
+ .required(false)
+ .type(Boolean.class)
+ .build());
+ options.addOption(Option.builder("c")
+ .longOpt("config-file")
+ .desc(String.format("the full path to the configuration file to use, "
+ + "the configuration file must be a Json file containing the %s parameters", this.component))
+ .hasArg().argName("CONFIG_FILE")
+ .required(false)
+ .type(String.class)
+ .build());
+ //@formatter:on
+ }
+
+ /**
+ * Construct the options for the CLI editor with extra options.
+ */
+ public CommandLineArgumentsHandler(String helpClassName, String component, Option... customOptions) {
+ this(helpClassName, component);
+ if (customOptions != null && customOptions.length > 0) {
+ for (Option option : customOptions) {
+ options.addOption(option);
+ }
+ }
+ }
+
+ /**
+ * Construct the options with brand new options for the CLI editor.
+ */
+ public CommandLineArgumentsHandler(String helpClassName, String component, Options options) {
+ this.options = options;
+ this.helpClassName = helpClassName;
+ this.component = component;
+ }
+
+ /**
+ * Parse the command line options.
+ *
+ * @param args The command line arguments
+ * @return a string with a message for help and version, or null if there is no message
+ * @throws CommandLineException on command argument errors
+ */
+ public String parse(final String[] args) throws CommandLineException {
+ // Clear all our arguments
+ setConfigurationFilePath(null);
+ setPropertyFilePath(null);
+
+ try {
+ commandLine = new DefaultParser().parse(options, args);
+ } catch (final ParseException | NullPointerException e) {
+ throw new CommandLineException("invalid command line arguments specified", e);
+ }
+
+ // Arguments left over after Commons CLI does its stuff
+ final String[] remainingArgs = removeEmptyValues(commandLine.getArgs());
+
+ if (remainingArgs.length > 0) {
+ throw new CommandLineException("too many command line arguments specified: " + Arrays.toString(args));
+ }
+
+ if (commandLine.hasOption('h')) {
+ return help();
+ }
+
+ if (commandLine.hasOption('v')) {
+ return version();
+ }
+
+ if (commandLine.hasOption('c')) {
+ setConfigurationFilePath(commandLine.getOptionValue('c'));
+ }
+
+ if (commandLine.hasOption('p')) {
+ setPropertyFilePath(commandLine.getOptionValue('p'));
+ }
+
+ return null;
+ }
+
+ /**
+ * Validate the command line options.
+ *
+ * @throws CommandLineException on command argument validation errors
+ */
+ public void validate() throws CommandLineException {
+ validateReadableFile(this.component + " configuration", configurationFilePath);
+ }
+
+ /**
+ * Print version information for policy distribution.
+ *
+ * @return the version string
+ */
+ public String version() {
+ return ResourceUtils.getResourceAsString("version.txt");
+ }
+
+ /**
+ * Print help information for policy distribution.
+ *
+ * @return the help string
+ */
+ public String help() {
+ final HelpFormatter helpFormatter = new HelpFormatter();
+ final StringWriter stringWriter = new StringWriter();
+ final PrintWriter printWriter = new PrintWriter(stringWriter);
+ final String cmdLineSyntax = this.helpClassName + " [options...]";
+
+ helpFormatter.printHelp(printWriter, HELP_LINE_LENGTH, cmdLineSyntax, "options", options, 0, 0, "");
+
+ return stringWriter.toString();
+ }
+
+ /**
+ * Gets the full expanded configuration file path.
+ *
+ * @return the configuration file path
+ */
+ public String getFullConfigurationFilePath() {
+ return ResourceUtils.getFilePath4Resource(getConfigurationFilePath());
+ }
+
+ /**
+ * Check set configuration file path.
+ *
+ * @return true, if check set configuration file path
+ */
+ public boolean checkSetConfigurationFilePath() {
+ return StringUtils.isNotBlank(getConfigurationFilePath());
+ }
+
+ /**
+ * Gets the full expanded property file path.
+ *
+ * @return the property file path
+ */
+ public String getFullPropertyFilePath() {
+ return ResourceUtils.getFilePath4Resource(getPropertyFilePath());
+ }
+
+ /**
+ * Check set property file path.
+ *
+ * @return true, if check set property file path
+ */
+ public boolean checkSetPropertyFilePath() {
+ return StringUtils.isNotBlank(getPropertyFilePath());
+ }
+
+ /**
+ * Validate readable file.
+ *
+ * @param fileTag the file tag
+ * @param fileName the file name
+ * @throws CommandLineException on the file name passed as a parameter
+ */
+ protected void validateReadableFile(final String fileTag, final String fileName) throws CommandLineException {
+ if (StringUtils.isBlank(fileName)) {
+ throw new CommandLineException(fileTag + " file was not specified as an argument");
+ }
+
+ // The file name refers to a resource on the local file system
+ final URL fileUrl = ResourceUtils.getUrl4Resource(fileName);
+ if (fileUrl == null) {
+ throw new CommandLineException(fileTag + FILE_MESSAGE_PREAMBLE + fileName + "\" does not exist");
+ }
+
+ try {
+ Path path = Path.of(fileUrl.toURI());
+ if (!Files.isRegularFile(path)) {
+ throw new CommandLineException(fileTag + FILE_MESSAGE_PREAMBLE + fileName + "\" is not a normal file");
+ }
+ if (!Files.isReadable(path)) {
+ throw new CommandLineException(fileTag + FILE_MESSAGE_PREAMBLE + fileName + "\" is unreadable");
+ }
+ } catch (URISyntaxException e) {
+ throw new CommandLineException("Error parsing " + fileUrl.toString(), e);
+ }
+
+ }
+
+ /**
+ * Checks if args has any null or empty value after parsing.
+ *
+ * @param args remaining args from CLI parse.
+ */
+ private String[] removeEmptyValues(String[] args) {
+ return Arrays.stream(args).filter(StringUtils::isNotBlank).toArray(String[]::new);
+ }
+}
diff --git a/utils/src/main/java/org/onap/policy/common/utils/cmd/CommandLineException.java b/utils/src/main/java/org/onap/policy/common/utils/cmd/CommandLineException.java
new file mode 100644
index 00000000..95870f75
--- /dev/null
+++ b/utils/src/main/java/org/onap/policy/common/utils/cmd/CommandLineException.java
@@ -0,0 +1,54 @@
+/*-
+ * ============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;
+
+/**
+ * Exception used for CommandLineArguments class.
+ *
+ * @author Adheli Tavares (adheli.tavares@est.tech)
+ *
+ */
+public class CommandLineException extends Exception {
+
+ /**
+ * Generated serialVersionUID.
+ */
+ private static final long serialVersionUID = -1200607308084606425L;
+
+ /**
+ * Instantiates a new exception with a message.
+ *
+ * @param message the message
+ */
+ public CommandLineException(final String message) {
+ super(message);
+ }
+
+ /**
+ * Instantiates a new exception with a message and a caused by exception.
+ *
+ * @param message the message
+ * @param exp the exception that caused this exception to be thrown
+ */
+ public CommandLineException(final String message, final Exception exp) {
+ super(message, exp);
+ }
+}