/*
 *  This file is part of the Jikes RVM project (http://jikesrvm.org).
 *
 *  This file is licensed to You under the Eclipse Public License (EPL);
 *  You may not use this file except in compliance with the License. You
 *  may obtain a copy of the License at
 *
 *      http://www.opensource.org/licenses/eclipse-1.0.php
 *
 *  See the COPYRIGHT.txt file distributed with this work for information
 *  regarding copyright ownership.
 */
package org.jikesrvm.tools.ant;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.taskdefs.MacroDef;
import org.apache.tools.ant.taskdefs.MacroInstance;

/**
 * A looping construct for ant. The task will accept a list of space separated
 * values. The task will then iterate over inner macro with name passed in as a parameter.
 */
public class ForEachTask
    extends Task {
  private String list;
  private String property;
  private MacroDef macroDef;

  public void setProperty(final String property) { this.property = property; }

  public void setList(final String list) { this.list = list; }

  public MacroDef.NestedSequential createSequential() {
    macroDef = new MacroDef();
    macroDef.setProject(getProject());
    return macroDef.createSequential();
  }

  public void execute() {
    validate();

    final MacroDef.Attribute attribute = new MacroDef.Attribute();
    attribute.setName(property);
    macroDef.addConfiguredAttribute(attribute);

    final String[] values = list.split(" ");
    for (String value : values) {
      final MacroInstance i = new MacroInstance();
      i.setProject(getProject());
      i.setOwningTarget(getOwningTarget());
      i.setMacroDef(macroDef);
      i.setDynamicAttribute(property, value);
      i.execute();
    }
  }

  private void validate() {
    if (null == list) throw new BuildException("List not set.");
    if (null == macroDef) throw new BuildException("Must specify a sequential task to iterate over.");
    if (null == property) throw new BuildException("Property not set.");
  }
}