From e93ab02d1e52fbc09a1e077c63f232ec1154f93e Mon Sep 17 00:00:00 2001
From: "Matteo Franci a.k.a. Fugerit" <m@fugerit.org>
Date: Mon, 20 May 2024 16:23:47 +0200
Subject: [PATCH] LibHelper utility added

---
 CHANGELOG.md                                  |  4 ++
 .../org/fugerit/java/core/lang/LibHelper.java | 49 +++++++++++++++++++
 .../fugerit/java/core/lang/TestLibHelper.java | 26 ++++++++++
 .../core/lang/lib_helper/test_ll_fug1.txt     |  0
 .../core/lang/lib_helper/test_ll_fug2.txt     |  0
 5 files changed, 79 insertions(+)
 create mode 100644 fj-core/src/main/java/org/fugerit/java/core/lang/LibHelper.java
 create mode 100644 fj-core/src/test/java/test/org/fugerit/java/core/lang/TestLibHelper.java
 create mode 100644 fj-core/src/test/resources/core/lang/lib_helper/test_ll_fug1.txt
 create mode 100644 fj-core/src/test/resources/core/lang/lib_helper/test_ll_fug2.txt

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b743e403..458c45a9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- LibHelper utility
+
 ## [8.6.1] - 2024-05-14
 
 ### Added
diff --git a/fj-core/src/main/java/org/fugerit/java/core/lang/LibHelper.java b/fj-core/src/main/java/org/fugerit/java/core/lang/LibHelper.java
new file mode 100644
index 00000000..e8b698f5
--- /dev/null
+++ b/fj-core/src/main/java/org/fugerit/java/core/lang/LibHelper.java
@@ -0,0 +1,49 @@
+package org.fugerit.java.core.lang;
+
+import lombok.extern.slf4j.Slf4j;
+import org.fugerit.java.core.cfg.ConfigRuntimeException;
+
+import java.io.File;
+import java.io.FilenameFilter;
+
+@Slf4j
+public class LibHelper {
+
+    private LibHelper() {}
+
+    private static final String LLP = "java.library.path";
+
+    public static int ll(String name ) {
+        return ll( name, 1 );
+    }
+
+    public static int ll(String name, int checkCount ) {
+        return ll( name, (f, n) -> n.contains(name), checkCount );
+    }
+
+    public static int ll(String name, FilenameFilter ffn, int checkCount ) {
+        String libPath = System.getProperty( LLP );
+        log.info( "loading library path [{}]", libPath );
+        int count = 0;
+        if ( libPath != null ) {
+            String[] listPath = libPath.split(File.pathSeparator );
+            for ( int k=0; k<listPath.length; k++ ) {
+                File folder = new File( listPath[k] );
+                if ( folder.isDirectory() ) {
+                    count+=folder.list(ffn).length;
+                }
+            }
+        }
+        log.info( "name : {}, checkCount : {}, count : {} ", name, checkCount, count );
+        if ( count > checkCount ) {
+            throw new ConfigRuntimeException( String.format( "%s is too many library paths : %s", name, count ) );
+        } else if ( count > 1 ) {
+            log.info( "loading library [{}]", name );
+            System.loadLibrary( name );
+        } else {
+            log.info( "skip loading library [{}]", name );
+        }
+        return count;
+    }
+
+}
diff --git a/fj-core/src/test/java/test/org/fugerit/java/core/lang/TestLibHelper.java b/fj-core/src/test/java/test/org/fugerit/java/core/lang/TestLibHelper.java
new file mode 100644
index 00000000..56f501be
--- /dev/null
+++ b/fj-core/src/test/java/test/org/fugerit/java/core/lang/TestLibHelper.java
@@ -0,0 +1,26 @@
+package test.org.fugerit.java.core.lang;
+
+import org.fugerit.java.core.cfg.ConfigRuntimeException;
+import org.fugerit.java.core.lang.LibHelper;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.File;
+import java.io.IOException;
+
+public class TestLibHelper {
+
+    private static final String LLP = "java.library.path";
+
+    @Test
+    public void testCount0() throws IOException {
+        File libraryPath = new File( "src/test/resources/core/lang/lib_helper" );
+        String llPath = System.getProperty( LLP );
+        System.setProperty( LLP, llPath+File.pathSeparator+libraryPath.getCanonicalPath() );
+        int count1 = LibHelper.ll( "test_ll_fug1" );
+        Assert.assertEquals( 1, count1 );
+        Assert.assertThrows( ConfigRuntimeException.class, () -> LibHelper.ll( "test_ll_fug" ) );
+        Assert.assertEquals( 0, LibHelper.ll( "test_ll_not_found" ) );
+    }
+
+}
diff --git a/fj-core/src/test/resources/core/lang/lib_helper/test_ll_fug1.txt b/fj-core/src/test/resources/core/lang/lib_helper/test_ll_fug1.txt
new file mode 100644
index 00000000..e69de29b
diff --git a/fj-core/src/test/resources/core/lang/lib_helper/test_ll_fug2.txt b/fj-core/src/test/resources/core/lang/lib_helper/test_ll_fug2.txt
new file mode 100644
index 00000000..e69de29b