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.tools.ant.taskdefs.condition;
  
  import org.apache.tools.ant.BuildException;
  import org.apache.tools.ant.MagicNames;
  import org.apache.tools.ant.Project;
  import org.apache.tools.ant.Task;
  import org.apache.tools.ant.util.DeweyDecimal;
  
  /**
   * An Ant version condition.
   * @since Ant 1.7
   */
  public class AntVersion extends Task implements Condition {
  
      private String atLeast = null;
      private String exactly = null;
      private String propertyname = null;
  
      /**
       * Run as a task.
       * @throws BuildException if an error occurs.
       */
      @Override
      public void execute() throws BuildException {
          if (propertyname == null) {
              throw new BuildException("'property' must be set.");
          }
          if (atLeast != null || exactly != null) {
              // If condition values are set, evaluate the condition
              if (eval()) {
                  getProject().setNewProperty(propertyname, getVersion().toString());
              }
          } else {
              // Raw task
              getProject().setNewProperty(propertyname, getVersion().toString());
          }
      }
  
      /**
       * Evaluate the condition.
       * @return true if the condition is true.
       * @throws BuildException if an error occurs.
       */
      @Override
      public boolean eval() throws BuildException {
          validate();
          DeweyDecimal actual = getVersion();
          if (null != atLeast) {
              return actual.isGreaterThanOrEqual(new DeweyDecimal(atLeast));
          }
          if (null != exactly) {
              return actual.isEqual(new DeweyDecimal(exactly));
          }
          //default
          return false;
      }
  
      private void validate() throws BuildException {
          if (atLeast != null && exactly != null) {
              throw new BuildException("Only one of atleast or exactly may be set.");
          }
          if (null == atLeast && null == exactly) {
              throw new BuildException("One of atleast or exactly must be set.");
          }
          if (atLeast != null) {
              try {
                  // only created for side effect
                  new DeweyDecimal(atLeast); //NOSONAR
              } catch (NumberFormatException e) {
                  throw new BuildException(
                      "The 'atleast' attribute is not a Dewey Decimal eg 1.1.0 : %s",
                      atLeast);
              }
          } else {
              try {
                  // only created for side effect
                  new DeweyDecimal(exactly); //NOSONAR
              } catch (NumberFormatException e) {
                  throw new BuildException(
                      "The 'exactly' attribute is not a Dewey Decimal eg 1.1.0 : %s",
                      exactly);
              }
          }
      }
  
      private DeweyDecimal getVersion() {
          Project p = new Project();
          p.init();
          StringBuilder sb = new StringBuilder();
          boolean foundFirstDigit = false;
          for (char versionChar : p.getProperty(MagicNames.ANT_VERSION).toCharArray()) {
              if (Character.isDigit(versionChar)) {
                  sb.append(versionChar);
                  foundFirstDigit = true;
              }
              if (versionChar == '.' && foundFirstDigit) {
                  sb.append(versionChar);
              }
              if (Character.isLetter(versionChar) && foundFirstDigit) {
                  break;
              }
          }
          return new DeweyDecimal(sb.toString());
      }
  
      /**
       * Get the atleast attribute.
       * @return the atleast attribute.
       */
      public String getAtLeast() {
          return atLeast;
      }
  
      /**
       * Set the atleast attribute.
       * This is of the form major.minor.point.
       * For example 1.7.0.
       * @param atLeast the version to check against.
       */
      public void setAtLeast(String atLeast) {
          this.atLeast = atLeast;
      }
  
      /**
       * Get the exactly attribute.
       * @return the exactly attribute.
       */
      public String getExactly() {
          return exactly;
      }
  
      /**
       * Set the exactly attribute.
       * This is of the form major.minor.point.
       * For example 1.7.0.
       * @param exactly the version to check against.
       */
      public void setExactly(String exactly) {
          this.exactly = exactly;
      }
  
      /**
       * Get the name of the property to hold the ant version.
       * @return the name of the property.
       */
      public String getProperty() {
          return propertyname;
      }
  
      /**
       * Set the name of the property to hold the ant version.
       * @param propertyname the name of the property.
       */
      public void setProperty(String propertyname) {
          this.propertyname = propertyname;
      }
  
  }
  