Move configuration format converter from log4j-1.2-api

.gitignore

@@ -13,14 +13,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-target/
+# IntelliJ IDEA
 .idea
 *.iml
 *.iws
-/out
-.flattened-pom.xml
-/.mvn/wrapper/maven-wrapper.jar
 # Eclipse
 .project
 .classpath
 .settings/
+# Generated by Maven
+.flattened-pom.xml
+dependency-reduced-pom.xml
+/.mvn/wrapper/maven-wrapper.jar
+target/

log4j-config-converter/pom.xml

@@ -0,0 +1,146 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Licensed to the Apache Software Foundation (ASF) under one or more
+  ~ contributor license agreements.  See the NOTICE file distributed with
+  ~ this work for additional information regarding copyright ownership.
+  ~ The ASF licenses this file to you 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.
+  -->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>org.apache.logging.log4j</groupId>
+    <artifactId>log4j-transform-parent</artifactId>
+    <version>${revision}</version>
+    <relativePath>../log4j-transform-parent</relativePath>
+  </parent>
+
+  <artifactId>log4j-config-converter</artifactId>
+  <name>Apache Log4j Configuration converter</name>
+  <description>Converts between multiple Log4j configuration formats.</description>
+
+  <properties>
+    <!-- Disabling `bnd-baseline-maven-plugin`, since we don't have a release yet to compare against. -->
+    <bnd.baseline.fail.on.missing>false</bnd.baseline.fail.on.missing>
+
+    <Main-Class>org.apache.logging.log4j.config.converter.Log4j1ConfigurationConverter</Main-Class>
+
+    <!-- Plugin versions -->
+    <maven-shade-plugin.version>3.4.1</maven-shade-plugin.version>
+
+    <!-- Dependencies -->
+    <log4j2.version>3.0.0-SNAPSHOT</log4j2.version>
+    <picocli.version>4.7.5</picocli.version>
+  </properties>
+
+  <dependencyManagement>
+    <dependencies>
+
+      <dependency>
+        <groupId>info.picocli</groupId>
+        <artifactId>picocli</artifactId>
+        <version>${picocli.version}</version>
+      </dependency>
+
+    </dependencies>
+  </dependencyManagement>
+
+  <dependencies>
+
+    <dependency>
+      <groupId>org.apache.logging.log4j</groupId>
+      <artifactId>log4j-api</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.apache.logging.log4j</groupId>
+      <artifactId>log4j-1.2-api</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.apache.logging.log4j</groupId>
+      <artifactId>log4j-core</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>info.picocli</groupId>
+      <artifactId>picocli</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.apache.logging.log4j</groupId>
+      <artifactId>log4j-api-test</artifactId>
+      <scope>test</scope>
+    </dependency>
+
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-api</artifactId>
+      <scope>test</scope>
+    </dependency>
+
+  </dependencies>
+
+  <build>
+
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <configuration>
+          <annotationProcessorPaths combine.children="append">
+            <path>
+              <groupId>info.picocli</groupId>
+              <artifactId>picocli-codegen</artifactId>
+              <version>${picocli.version}</version>
+            </path>
+          </annotationProcessorPaths>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-shade-plugin</artifactId>
+        <version>${maven-shade-plugin.version}</version>
+        <dependencies>
+          <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-transform-maven-shade-plugin-extensions</artifactId>
+            <version>${project.version}</version>
+          </dependency>
+        </dependencies>
+        <executions>
+          <execution>
+            <id>shade-jar-with-dependencies</id>
+            <goals>
+              <goal>shade</goal>
+            </goals>
+            <configuration>
+              <shadedArtifactAttached>true</shadedArtifactAttached>
+              <transformers>
+                <transformer implementation="org.apache.logging.log4j.maven.plugins.shade.transformer.Log4j2PluginCacheFileTransformer" />
+                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
+                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                  <manifestEntries>
+                    <Multi-Release>true</Multi-Release>
+                  </manifestEntries>
+                </transformer>
+              </transformers>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+
+  </build>
+
+</project>

log4j-config-converter/src/main/java/org/apache/logging/log4j/config/converter/InputStreamWrapper.java

@@ -0,0 +1,91 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to you 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.
+ */
+package org.apache.logging.log4j.config.converter;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+class InputStreamWrapper extends InputStream {
+
+    private final String description;
+    private final InputStream input;
+
+    public InputStreamWrapper(final InputStream input, final String description) {
+        this.input = input;
+        this.description = description;
+    }
+
+    @Override
+    public int available() throws IOException {
+        return input.available();
+    }
+
+    @Override
+    public void close() throws IOException {
+        input.close();
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        return input.equals(obj);
+    }
+
+    @Override
+    public int hashCode() {
+        return input.hashCode();
+    }
+
+    @Override
+    public synchronized void mark(final int readlimit) {
+        input.mark(readlimit);
+    }
+
+    @Override
+    public boolean markSupported() {
+        return input.markSupported();
+    }
+
+    @Override
+    public int read() throws IOException {
+        return input.read();
+    }
+
+    @Override
+    public int read(final byte[] b) throws IOException {
+        return input.read(b);
+    }
+
+    @Override
+    public int read(final byte[] b, final int off, final int len) throws IOException {
+        return input.read(b, off, len);
+    }
+
+    @Override
+    public synchronized void reset() throws IOException {
+        input.reset();
+    }
+
+    @Override
+    public long skip(final long n) throws IOException {
+        return input.skip(n);
+    }
+
+    @Override
+    public String toString() {
+        return getClass().getSimpleName() + " [description=" + description + ", input=" + input + "]";
+    }
+}