Github user martin-g commented on a diff in the pull request:
https://github.com/apache/wicket/pull/87#discussion_r24094502
--- Diff:
wicket-core/src/main/java/org/apache/wicket/resource/CompositeCssCompressor.java
---
@@ -0,0 +1,93 @@
+/*
+ * 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.wicket.resource;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.apache.wicket.css.ICssCompressor;
+
+/**
+ * Used to apply several {@link ICssCompressor} to the CSS compression.<br>
+ * <br>
+ * Usage:
+ *
+ * <pre>
+ * CompositeCssCompressor compositeCssCompressor = new
CompositeCssCompressor();
+ *
+ * compositeCssCompressor.getCompressors().add(new MyCssCompressor());
+ * compositeCssCompressor.getCompressors().add(new AnotherCssCompressor());
+ *
+ * this.getResourceSettings().setCssCompressor(compositeCssCompressor);
+ * </pre>
+ * The compressors can also be given as constructor arguments.
+ *
+ * @since 6.20.0
+ * @author Tobias Soloschenko
+ *
+ */
+public class CompositeCssCompressor implements ICssCompressor
+{
+
+ /* Compressors to compress the CSS content */
+ private List<ICssCompressor> compressors = new ArrayList<>();
+
+ /**
+ * Initializes an empty composite CSS compressor
+ */
+ public CompositeCssCompressor()
--- End diff --
This constructor can be removed. The second one covers the use case of
empty argument list.
Define the field as: `private final List<ICssCompressor> compressors;`
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