Initial addition into subversion with build script changes

git-svn-id: file:///home/sven/projects/JOGL/temp/ant-contrib/svn/ant-contrib-code/trunk/ant-contrib@5 32d7a393-a5a9-423c-abd3-5d954feb1f2f

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diff --git a/src/java/net/sf/antcontrib/logic/IfTask.java b/src/java/net/sf/antcontrib/logic/IfTask.java
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+/*
+ * Copyright (c) 2001-2004 Ant-Contrib project.  All rights reserved.
+ *
+ * Licensed 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 net.sf.antcontrib.logic;
+
+import java.util.Vector;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.taskdefs.Sequential;
+import org.apache.tools.ant.taskdefs.condition.Condition;
+import org.apache.tools.ant.taskdefs.condition.ConditionBase;
+
+/**
+ * Perform some tasks based on whether a given condition holds true or
+ * not.
+ *
+ * <p>This task is heavily based on the Condition framework that can
+ * be found in Ant 1.4 and later, therefore it cannot be used in
+ * conjunction with versions of Ant prior to 1.4.</p>
+ *
+ * <p>This task doesn't have any attributes, the condition to test is
+ * specified by a nested element - see the documentation of your
+ * <code>&lt;condition&gt;</code> task (see
+ * <a href="http://jakarta.apache.org/ant/manual/CoreTasks/condition.html">the
+ * online documentation</a> for example) for a complete list of nested
+ * elements.</p>
+ *
+ * <p>Just like the <code>&lt;condition&gt;</code> task, only a single
+ * condition can be specified - you combine them using
+ * <code>&lt;and&gt;</code> or <code>&lt;or&gt;</code> conditions.</p>
+ *
+ * <p>In addition to the condition, you can specify three different
+ * child elements, <code>&lt;elseif&gt;</code>, <code>&lt;then&gt;</code> and
+ * <code>&lt;else&gt;</code>.  All three subelements are optional.
+ *
+ * Both <code>&lt;then&gt;</code> and <code>&lt;else&gt;</code> must not be
+ * used more than once inside the if task.  Both are
+ * containers for Ant tasks, just like Ant's
+ * <code>&lt;parallel&gt;</code> and <code>&lt;sequential&gt;</code>
+ * tasks - in fact they are implemented using the same class as Ant's
+ * <code>&lt;sequential&gt;</code> task.</p>
+ *
+ *  The <code>&lt;elseif&gt;</code> behaves exactly like an <code>&lt;if&gt;</code>
+ * except that it cannot contain the <code>&lt;else&gt;</code> element
+ * inside of it.  You may specify as may of these as you like, and the
+ * order they are specified is the order they are evaluated in.  If the
+ * condition on the <code>&lt;if&gt;</code> is false, then the first
+ * <code>&lt;elseif&gt;</code> who's conditional evaluates to true
+ * will be executed.  The <code>&lt;else&gt;</code> will be executed
+ * only if the <code>&lt;if&gt;</code> and all <code>&lt;elseif&gt;</code>
+ * conditions are false.
+ *
+ * <p>Use the following task to define the <code>&lt;if&gt;</code>
+ * task before you use it the first time:</p>
+ *
+ * <pre><code>
+ *   &lt;taskdef name="if" classname="net.sf.antcontrib.logic.IfTask" /&gt;
+ * </code></pre>
+ *
+ * <h3>Crude Example</h3>
+ *
+ * <pre><code>
+ * &lt;if&gt;
+ *  &lt;equals arg1=&quot;${foo}&quot; arg2=&quot;bar&quot; /&gt;
+ *  &lt;then&gt;
+ *    &lt;echo message=&quot;The value of property foo is bar&quot; /&gt;
+ *  &lt;/then&gt;
+ *  &lt;else&gt;
+ *    &lt;echo message=&quot;The value of property foo is not bar&quot; /&gt;
+ *  &lt;/else&gt;
+ * &lt;/if&gt;
+ * </code>
+ *
+ * <code>
+ * &lt;if&gt;
+ *  &lt;equals arg1=&quot;${foo}&quot; arg2=&quot;bar&quot; /&gt;
+ *  &lt;then&gt;
+ *   &lt;echo message=&quot;The value of property foo is 'bar'&quot; /&gt;
+ *  &lt;/then&gt;
+ *
+ *  &lt;elseif&gt;
+ *   &lt;equals arg1=&quot;${foo}&quot; arg2=&quot;foo&quot; /&gt;
+ *   &lt;then&gt;
+ *    &lt;echo message=&quot;The value of property foo is 'foo'&quot; /&gt;
+ *   &lt;/then&gt;
+ *  &lt;/elseif&gt;
+ *
+ *  &lt;else&gt;
+ *   &lt;echo message=&quot;The value of property foo is not 'foo' or 'bar'&quot; /&gt;
+ *  &lt;/else&gt;
+ * &lt;/if&gt;
+ * </code></pre>
+ *
+ * @author <a href="mailto:[email protected]">Stefan Bodewig</a>
+ */
+public class IfTask extends ConditionBase {
+
+    public static final class ElseIf
+        extends ConditionBase
+    {
+        private Sequential thenTasks = null;
+
+        public void addThen(Sequential t)
+        {
+            if (thenTasks != null)
+            {
+                throw new BuildException("You must not nest more than one <then> into <elseif>");
+            }
+            thenTasks = t;
+        }
+
+        public boolean eval()
+            throws BuildException
+        {
+            if (countConditions() > 1) {
+                throw new BuildException("You must not nest more than one condition into <elseif>");
+            }
+            if (countConditions() < 1) {
+                throw new BuildException("You must nest a condition into <elseif>");
+            }
+            Condition c = (Condition) getConditions().nextElement();
+
+            return c.eval();
+        }
+
+        public void execute()
+            throws BuildException
+        {
+            if (thenTasks != null)
+            {
+                thenTasks.execute();
+            }
+        }
+    }
+
+    private Sequential thenTasks = null;
+    private Vector     elseIfTasks = new Vector();
+    private Sequential elseTasks = null;
+
+    /***
+     * A nested Else if task
+     */
+    public void addElseIf(ElseIf ei)
+    {
+        elseIfTasks.addElement(ei);
+    }
+
+    /**
+     * A nested &lt;then&gt; element - a container of tasks that will
+     * be run if the condition holds true.
+     *
+     * <p>Not required.</p>
+     */
+    public void addThen(Sequential t) {
+        if (thenTasks != null) {
+            throw new BuildException("You must not nest more than one <then> into <if>");
+        }
+        thenTasks = t;
+    }
+
+    /**
+     * A nested &lt;else&gt; element - a container of tasks that will
+     * be run if the condition doesn't hold true.
+     *
+     * <p>Not required.</p>
+     */
+    public void addElse(Sequential e) {
+        if (elseTasks != null) {
+            throw new BuildException("You must not nest more than one <else> into <if>");
+        }
+        elseTasks = e;
+    }
+
+    public void execute() throws BuildException {
+        if (countConditions() > 1) {
+            throw new BuildException("You must not nest more than one condition into <if>");
+        }
+        if (countConditions() < 1) {
+            throw new BuildException("You must nest a condition into <if>");
+        }
+        Condition c = (Condition) getConditions().nextElement();
+        if (c.eval()) {
+            if (thenTasks != null) {
+                thenTasks.execute();
+            }
+        }
+        else
+        {
+            boolean done = false;
+            int sz = elseIfTasks.size();
+            for (int i=0;i<sz && ! done;i++)
+            {
+
+                ElseIf ei = (ElseIf)(elseIfTasks.elementAt(i));
+                if (ei.eval())
+                {
+                    done = true;
+                    ei.execute();
+                }
+            }
+
+            if (!done && elseTasks != null)
+            {
+                elseTasks.execute();
+            }
+        }
+    }
+}