From 6bc45fd509a55b0b003a4e004335ac2d3e91377d Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Tue, 1 Apr 2014 18:14:22 -0400
Subject: Add sangria-core module.

---
 .../com/tavianator/sangria/core/DelayedError.java  | 91 ++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 sangria-core/src/main/java/com/tavianator/sangria/core/DelayedError.java

(limited to 'sangria-core/src/main/java/com/tavianator/sangria/core/DelayedError.java')

diff --git a/sangria-core/src/main/java/com/tavianator/sangria/core/DelayedError.java b/sangria-core/src/main/java/com/tavianator/sangria/core/DelayedError.java
new file mode 100644
index 0000000..4fa9eab
--- /dev/null
+++ b/sangria-core/src/main/java/com/tavianator/sangria/core/DelayedError.java
@@ -0,0 +1,91 @@
+/*********************************************************************
+ * Sangria                                                           *
+ * Copyright (C) 2014 Tavian Barnes <tavianator@tavianator.com>      *
+ *                                                                   *
+ * This library is free software. It comes without any warranty, to  *
+ * the extent permitted by applicable law. You can redistribute it   *
+ * and/or modify it under the terms of the Do What The Fuck You Want *
+ * To Public License, Version 2, as published by Sam Hocevar. See    *
+ * the COPYING file or http://www.wtfpl.net/ for more details.       *
+ *********************************************************************/
+
+package com.tavianator.sangria.core;
+
+import javax.inject.Inject;
+
+import com.google.common.collect.ImmutableList;
+import com.google.inject.Binder;
+import com.google.inject.CreationException;
+import com.google.inject.Injector;
+import com.google.inject.spi.Message;
+
+/**
+ * Similar to {@link Binder#addError(String, Object...)}, but can be canceled later. Useful for enforcing correct usage
+ * of fluent APIs.
+ *
+ * @author Tavian Barnes (tavianator@tavianator.com)
+ * @version 1.0
+ * @since 1.0
+ */
+public class DelayedError {
+    private Throwable error;
+
+    /**
+     * Create a {@link DelayedError}.
+     *
+     * @param binder  The binder to attach the error to.
+     * @param message The format string for the message.
+     * @param args    Arguments that will be passed to the format string.
+     * @return A {@link DelayedError} token that can be canceled later.
+     * @see Binder#addError(String, Object...)
+     */
+    public static DelayedError create(Binder binder, String message, Object... args) {
+        return create(binder, new Message(PrettyTypes.format(message, args)));
+    }
+
+    /**
+     * Create a {@link DelayedError}.
+     *
+     * @param binder The binder to attach the error to.
+     * @param t      The {@link Throwable} that caused this potential error.
+     * @return A {@link DelayedError} token that can be canceled later.
+     * @see Binder#addError(Throwable)
+     */
+    public static DelayedError create(Binder binder, Throwable t) {
+        DelayedError error = new DelayedError(t);
+        binder.skipSources(DelayedError.class)
+                .requestInjection(error);
+        return error;
+    }
+
+    /**
+     * Create a {@link DelayedError}.
+     *
+     * @param binder  The binder to attach the error to.
+     * @param message The error message.
+     * @return A {@link DelayedError} token that can be canceled later.
+     * @see Binder#addError(Message)
+     */
+    public static DelayedError create(Binder binder, Message message) {
+        // Using CreationException allows Guice to extract the Message and format it nicely
+        return create(binder, new CreationException(ImmutableList.of(message)));
+    }
+
+    private DelayedError(Throwable error) {
+        this.error = error;
+    }
+
+    /**
+     * Cancel this error.
+     */
+    public void cancel() {
+        this.error = null;
+    }
+
+    @Inject
+    void inject(Injector injector) throws Throwable {
+        if (error != null) {
+            throw error;
+        }
+    }
+}
-- 
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