--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/text/Assert.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,199 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2008 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.jface.text.Assert;
+
+import dwt.dwthelper.utils;
+
+
+/**
+ * <code>Assert</code> is useful for for embedding runtime sanity checks
+ * in code. The static predicate methods all test a condition and throw some
+ * type of unchecked exception if the condition does not hold.
+ * <p>
+ * Assertion failure exceptions, like most runtime exceptions, are
+ * thrown when something is misbehaving. Assertion failures are invariably
+ * unspecified behavior; consequently, clients should never rely on
+ * these being thrown (or not thrown). <b>If you find yourself in the
+ * position where you need to catch an assertion failure, you have most
+ * certainly written your program incorrectly.</b>
+ * </p>
+ * <p>
+ * Note that an <code>assert</code> statement is slated to be added to the
+ * Java language in JDK 1.4, rending this class obsolete.
+ * </p>
+ * 
+ * @deprecated As of 3.3, replaced by {@link dwtx.core.runtime.Assert}
+ * @noinstantiate This class is not intended to be instantiated by clients.
+ */
+public final class Assert {
+
+        /**
+         * <code>AssertionFailedException</code> is a runtime exception thrown
+         * by some of the methods in <code>Assert</code>.
+         * <p>
+         * This class is not declared public to prevent some misuses; programs that catch
+         * or otherwise depend on assertion failures are susceptible to unexpected
+         * breakage when assertions in the code are added or removed.
+         * </p>
+         * <p>
+         * This class is not intended to be serialized.
+         * </p>
+         */
+        private static class AssertionFailedException : RuntimeException {
+
+            /**
+             * Serial version UID for this class.
+             * <p>
+             * Note: This class is not intended to be serialized.
+             * </p>
+             * @since 3.1
+             */
+            private static final long serialVersionUID= 3689918374733886002L;
+
+            /**
+             * Constructs a new exception.
+             */
+            public AssertionFailedException() {
+            }
+
+            /**
+             * Constructs a new exception with the given message.
+             *
+             * @param detail the detailed message
+             */
+            public AssertionFailedException(String detail) {
+                super(detail);
+            }
+        }
+
+    /* This class is not intended to be instantiated. */
+    private Assert() {
+    }
+
+    /**
+     * Asserts that an argument is legal. If the given bool is
+     * not <code>true</code>, an <code>IllegalArgumentException</code>
+     * is thrown.
+     *
+     * @param expression the outcome of the check
+     * @return <code>true</code> if the check passes (does not return
+     *    if the check fails)
+     * @exception IllegalArgumentException if the legality test failed
+     */
+    public static bool isLegal(bool expression) {
+        // succeed as quickly as possible
+        if (expression) {
+            return true;
+        }
+        return isLegal(expression, "");//$NON-NLS-1$
+    }
+
+    /**
+     * Asserts that an argument is legal. If the given bool is
+     * not <code>true</code>, an <code>IllegalArgumentException</code>
+     * is thrown.
+     * The given message is included in that exception, to aid debugging.
+     *
+     * @param expression the outcome of the check
+     * @param message the message to include in the exception
+     * @return <code>true</code> if the check passes (does not return
+     *    if the check fails)
+     * @exception IllegalArgumentException if the legality test failed
+     */
+    public static bool isLegal(bool expression, String message) {
+        if (!expression)
+            throw new IllegalArgumentException("assertion failed; " + message); //$NON-NLS-1$
+        return expression;
+    }
+
+    /**
+     * Asserts that the given object is not <code>null</code>. If this
+     * is not the case, some kind of unchecked exception is thrown.
+     * <p>
+     * As a general rule, parameters passed to API methods must not be
+     * <code>null</code> unless <b>explicitly</b> allowed in the method's
+     * specification. Similarly, results returned from API methods are never
+     * <code>null</code> unless <b>explicitly</b> allowed in the method's
+     * specification. Implementations are encouraged to make regular use of
+     * <code>Assert.isNotNull</code> to ensure that <code>null</code>
+     * parameters are detected as early as possible.
+     * </p>
+     *
+     * @param object the value to test
+     * @exception RuntimeException an unspecified unchecked exception if the object
+     *   is <code>null</code>
+     */
+    public static void isNotNull(Object object) {
+        // succeed as quickly as possible
+        if (object !is null) {
+            return;
+        }
+        isNotNull(object, "");//$NON-NLS-1$
+    }
+
+    /**
+     * Asserts that the given object is not <code>null</code>. If this
+     * is not the case, some kind of unchecked exception is thrown.
+     * The given message is included in that exception, to aid debugging.
+     * <p>
+     * As a general rule, parameters passed to API methods must not be
+     * <code>null</code> unless <b>explicitly</b> allowed in the method's
+     * specification. Similarly, results returned from API methods are never
+     * <code>null</code> unless <b>explicitly</b> allowed in the method's
+     * specification. Implementations are encouraged to make regular use of
+     * <code>Assert.isNotNull</code> to ensure that <code>null</code>
+     * parameters are detected as early as possible.
+     * </p>
+     *
+     * @param object the value to test
+     * @param message the message to include in the exception
+     * @exception RuntimeException an unspecified unchecked exception if the object
+     *   is <code>null</code>
+     */
+    public static void isNotNull(Object object, String message) {
+        if (object is null)
+            throw new AssertionFailedException("null argument;" + message);//$NON-NLS-1$
+    }
+
+    /**
+     * Asserts that the given bool is <code>true</code>. If this
+     * is not the case, some kind of unchecked exception is thrown.
+     *
+     * @param expression the outcome of the check
+     * @return <code>true</code> if the check passes (does not return
+     *    if the check fails)
+     */
+    public static bool isTrue(bool expression) {
+        // succeed as quickly as possible
+        if (expression) {
+            return true;
+        }
+        return isTrue(expression, "");//$NON-NLS-1$
+    }
+
+    /**
+     * Asserts that the given bool is <code>true</code>. If this
+     * is not the case, some kind of unchecked exception is thrown.
+     * The given message is included in that exception, to aid debugging.
+     *
+     * @param expression the outcome of the check
+     * @param message the message to include in the exception
+     * @return <code>true</code> if the check passes (does not return
+     *    if the check fails)
+     */
+    public static bool isTrue(bool expression, String message) {
+        if (!expression)
+            throw new AssertionFailedException("Assertion failed: "+message);//$NON-NLS-1$
+        return expression;
+    }
+}