content: /*
   *  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.causeway.viewer.wicket.ui.util;
  
  import java.util.stream.Collectors;
  
  import org.apache.wicket.util.template.PackageTextTemplate;
  
  import org.apache.causeway.commons.io.TextUtils;
  
  /**
   * Introduced for optimization purposes.
   */
  public abstract class LicensedTextTemplate
  extends PackageTextTemplate {
  
      private static final long serialVersionUID = 1L;
  
      private final int skipLicenseLines;
  
      public LicensedTextTemplate(final Class<?> clazz, final String fileName, final int skipLicenseLines) {
          super(clazz, fileName);
          this.skipLicenseLines = skipLicenseLines;
      }
  
      // super class provides no way of accessing its memoized buffer; so we need to re-memoize here
      protected String scriptTemplate = null;
  
      @Override
      public String getString() {
          if(scriptTemplate==null) {
              var raw = super.getString();
  
              // strip first n comment lines
              this.scriptTemplate = TextUtils.streamLines(raw)
              .skip(skipLicenseLines)
              .collect(Collectors.joining(" "));
          }
          return scriptTemplate;
      }
  
  }
  