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
   *
   *      https://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.ivy.core.settings;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.ivy.core.IvyPatternHelper;
  import org.apache.ivy.util.Message;
  
  public class IvyVariableContainerImpl implements IvyVariableContainer {
  
      private Map<String, String> variables;
  
      private String envPrefix;
  
      public IvyVariableContainerImpl() {
          this.variables = new HashMap<>();
      }
  
      public IvyVariableContainerImpl(Map<String, String> variables) {
          this.variables = variables;
      }
  
      /*
       * (non-Javadoc)
       *
       * @see org.apache.ivy.core.settings.IvyVariableContainer#setVariable(java.lang.String,
       * java.lang.String, boolean)
       */
      public void setVariable(String varName, String value, boolean overwrite) {
          if (overwrite || !variables.containsKey(varName)) {
              Message.debug("setting '" + varName + "' to '" + value + "'");
              variables.put(varName, substitute(value));
          } else {
              Message.debug("'" + varName + "' already set: discarding '" + value + "'");
          }
      }
  
      public void setEnvironmentPrefix(String prefix) {
          if (prefix != null && !prefix.endsWith(".")) {
              this.envPrefix = prefix + ".";
          } else {
              this.envPrefix = prefix;
          }
      }
  
      protected String substitute(String value) {
          return IvyPatternHelper.substituteVariables(value, this);
      }
  
      protected Map<String, String> getVariables() {
          return variables;
      }
  
      protected String getEnvironmentPrefix() {
          return envPrefix;
      }
  
      /*
       * (non-Javadoc)
       *
       * @see org.apache.ivy.core.settings.IvyVariableContainer#getVariable(java.lang.String)
       */
      public String getVariable(String name) {
          String val = null;
          if (envPrefix != null && name.startsWith(envPrefix)) {
              val = System.getenv(name.substring(envPrefix.length()));
          } else {
              val = variables.get(name);
          }
  
          return val;
      }
  
      public Object clone() {
          IvyVariableContainerImpl clone;
          try {
              clone = (IvyVariableContainerImpl) super.clone();
          } catch (CloneNotSupportedException e) {
              throw new RuntimeException("unable to clone a " + this.getClass());
          }
          clone.variables = new HashMap<>(this.variables);
          return clone;
      }
  }
  