Add rules engine framework and exit code validation

src/main/java/org/jboss/jws/diag/common/Severity.java

@@ -0,0 +1,7 @@
+package org.jboss.jws.diag.common;
+
+public enum Severity {
+    ERROR,
+    WARN,
+    INFO
+}

src/main/java/org/jboss/jws/diag/validate/Rule.java

@@ -0,0 +1,10 @@
+package org.jboss.jws.diag.validate;
+
+import org.jboss.jws.diag.validate.model.Finding;
+
+import java.util.List;
+
+public interface Rule {
+
+    List<Finding> evaluate(RuleContext context);
+}

src/main/java/org/jboss/jws/diag/validate/RuleContext.java

@@ -0,0 +1,15 @@
+package org.jboss.jws.diag.validate;
+
+import java.nio.file.Path;
+
+public final class RuleContext {
+    private final Path catalinaBase;
+
+    public RuleContext(Path catalinaBase) {
+        this.catalinaBase = catalinaBase;
+    }
+
+    public Path getCatalinaBase() {
+        return catalinaBase;
+    }
+}

src/main/java/org/jboss/jws/diag/validate/ValidateCommand.java

@@ -2,9 +2,14 @@
 
 import org.jboss.jws.diag.common.ExitCodes;
 import org.jboss.jws.diag.common.OutputFormatMixin;
+import org.jboss.jws.diag.common.Severity;
+import org.jboss.jws.diag.validate.model.Finding;
 import picocli.CommandLine.Command;
 import picocli.CommandLine.Mixin;
 
+import java.util.ArrayList;
+import java.util.List;
+
 @Command(name = "validate",
         description = "Run diagnostic rules against configuration and report findings (INFO/WARN/ERROR)",
         mixinStandardHelpOptions = true)
@@ -15,7 +20,23 @@ public class ValidateCommand implements Runnable {
 
     @Override
     public void run() {
-        System.out.println("jws-diag validate: not yet implemented");
-        System.exit(ExitCodes.OK);
+        List<Finding> findings = new ArrayList<>();
+
+        int exitCode = determineExitCode(findings);
+        System.exit(exitCode);
+    }
+
+    public int determineExitCode(List<Finding> findings) {
+        int highestCode = ExitCodes.OK;
+
+        for (Finding finding : findings) {
+            if (finding.getSeverity() == Severity.ERROR) {
+                highestCode = ExitCodes.ERRORS;
+            } else if (finding.getSeverity() == Severity.WARN && highestCode < ExitCodes.ERRORS) {
+                highestCode = ExitCodes.WARNINGS;
+            }
+        }
+
+        return highestCode;
     }
 }

src/main/java/org/jboss/jws/diag/validate/model/Finding.java

@@ -0,0 +1,109 @@
+package org.jboss.jws.diag.validate.model;
+
+import org.jboss.jws.diag.common.Severity;
+import com.fasterxml.jackson.annotation.JsonInclude;
+
+@JsonInclude(JsonInclude.Include.NON_NULL)
+public final class Finding {
+
+    private final String ruleId;
+    private final String category;
+    private final Severity severity;
+    private final String summary;
+    private final String detail;
+    private final String file;
+    private final String fix;
+
+    private Finding(Builder builder) {
+        this.ruleId = builder.ruleId;
+        this.category = builder.category;
+        this.severity = builder.severity;
+        this.summary = builder.summary;
+        this.detail = builder.detail;
+        this.file = builder.file;
+        this.fix = builder.fix;
+    }
+
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public static final class Builder {
+
+        private String ruleId;
+        private String category;
+        private Severity severity;
+        private String summary;
+        private String detail;
+        private String file;
+        private String fix;
+
+        public Builder ruleId(String ruleId) {
+            this.ruleId = ruleId;
+            return this;
+        }
+        public Builder category(String category) {
+            this.category = category;
+            return this;
+        }
+        public Builder severity(Severity severity) {
+            this.severity = severity;
+            return this;
+        }
+        public Builder summary(String summary) {
+            this.summary = summary;
+            return this;
+        }
+        public Builder detail(String detail) {
+            this.detail = detail;
+            return this;
+        }
+        public Builder file(String file) {
+            this.file = file;
+            return this;
+        }
+        public Builder fix(String fix) {
+            this.fix = fix;
+            return this;
+        }
+
+        public Finding build() {
+            return new Finding(this);
+        }
+    }
+
+    public String getRuleId() {
+        return ruleId;
+    }
+    public String getCategory() {
+        return category;
+    }
+    public Severity getSeverity() {
+        return severity;
+    }
+    public String getSummary() {
+        return summary;
+    }
+    public String getDetail() {
+        return detail;
+    }
+    public String getFile() {
+        return file;
+    }
+    public String getFix() {
+        return fix;
+    }
+
+    @Override
+    public String toString() {
+        return "Finding{" +
+                "ruleId='" + ruleId + '\'' +
+                ", category='" + category + '\'' +
+                ", severity='" + severity + '\'' +
+                ", summary='"  + summary  + '\'' +
+                ", detail='"   + detail   + '\'' +
+                ", file='"     + file     + '\'' +
+                ", fix='"      + fix      + '\'' +
+                '}';
+    }
+}