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authorTavian Barnes <tavianator@tavianator.com>2014-04-01 18:14:22 -0400
committerTavian Barnes <tavianator@tavianator.com>2014-04-01 18:23:46 -0400
commit6bc45fd509a55b0b003a4e004335ac2d3e91377d (patch)
treeffbc824eeb23ebac693ca7c2035b852b39212515 /sangria-core/src/main/java
downloadsangria-6bc45fd509a55b0b003a4e004335ac2d3e91377d.tar.xz
Add sangria-core module.
Diffstat (limited to 'sangria-core/src/main/java')
-rw-r--r--sangria-core/src/main/java/com/tavianator/sangria/core/DelayedError.java91
-rw-r--r--sangria-core/src/main/java/com/tavianator/sangria/core/PrettyTypes.java75
-rw-r--r--sangria-core/src/main/java/com/tavianator/sangria/core/UniqueAnnotations.java97
3 files changed, 263 insertions, 0 deletions
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;
+ }
+ }
+}
diff --git a/sangria-core/src/main/java/com/tavianator/sangria/core/PrettyTypes.java b/sangria-core/src/main/java/com/tavianator/sangria/core/PrettyTypes.java
new file mode 100644
index 0000000..12721a4
--- /dev/null
+++ b/sangria-core/src/main/java/com/tavianator/sangria/core/PrettyTypes.java
@@ -0,0 +1,75 @@
+/*********************************************************************
+ * 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 com.google.inject.Key;
+
+/**
+ * Utility class for pretty-printing messages containing types.
+ *
+ * @author Tavian Barnes (tavianator@tavianator.com)
+ * @version 1.0
+ * @since 1.0
+ */
+public class PrettyTypes {
+ private PrettyTypes() {
+ // Not for instantiating
+ }
+
+ /**
+ * Format a message.
+ *
+ * @param message The format string.
+ * @param args The format arguments, possibly containing {@link Class} or {@link Key} instances to be
+ * pretty-printed.
+ * @return A formatted message.
+ * @see String#format(String, Object...)
+ */
+ public static String format(String message, Object... args) {
+ // This is like Guice's internal Errors.format()
+ Object[] prettyArgs = new Object[args.length];
+ for (int i = 0; i < args.length; ++i) {
+ Object arg = args[i];
+ Object prettyArg;
+
+ if (arg instanceof Class) {
+ prettyArg = format((Class<?>)arg);
+ } else if (arg instanceof Key) {
+ prettyArg = format((Key<?>)arg);
+ } else {
+ prettyArg = arg;
+ }
+
+ prettyArgs[i] = prettyArg;
+ }
+
+ return String.format(message, prettyArgs);
+ }
+
+ private static String format(Class<?> type) {
+ return type.getCanonicalName();
+ }
+
+ private static String format(Key<?> key) {
+ StringBuilder builder = new StringBuilder(key.getTypeLiteral().toString());
+ if (key.getAnnotationType() != null) {
+ builder.append(" annotated with ");
+ if (key.getAnnotation() != null) {
+ builder.append(key.getAnnotation());
+ } else {
+ builder.append("@")
+ .append(format(key.getAnnotationType()));
+ }
+ }
+ return builder.toString();
+ }
+}
diff --git a/sangria-core/src/main/java/com/tavianator/sangria/core/UniqueAnnotations.java b/sangria-core/src/main/java/com/tavianator/sangria/core/UniqueAnnotations.java
new file mode 100644
index 0000000..bfdfe6b
--- /dev/null
+++ b/sangria-core/src/main/java/com/tavianator/sangria/core/UniqueAnnotations.java
@@ -0,0 +1,97 @@
+/*********************************************************************
+ * 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 java.lang.annotation.Annotation;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.util.concurrent.atomic.AtomicLong;
+import javax.inject.Qualifier;
+
+import com.google.common.annotations.VisibleForTesting;
+
+/**
+ * Re-implementation of Guice's internal UniqueAnnotations utility.
+ *
+ * @author Tavian Barnes (tavianator@tavianator.com)
+ * @version 1.0
+ * @since 1.0
+ */
+public class UniqueAnnotations {
+ private static final AtomicLong SEQUENCE = new AtomicLong();
+
+ private UniqueAnnotations() {
+ // Not for instantiating
+ }
+
+ @Retention(RetentionPolicy.RUNTIME)
+ @Qualifier
+ @VisibleForTesting
+ @interface UniqueAnnotation {
+ long value();
+ }
+
+ /**
+ * Actual implementation of {@link UniqueAnnotation}.
+ */
+ @SuppressWarnings("ClassExplicitlyAnnotation")
+ private static class UniqueAnnotationImpl implements UniqueAnnotation {
+ private final long value;
+
+ UniqueAnnotationImpl(long value) {
+ this.value = value;
+ }
+
+ @Override
+ public long value() {
+ return value;
+ }
+
+ public Class<? extends Annotation> annotationType() {
+ return UniqueAnnotation.class;
+ }
+
+ @Override
+ public String toString() {
+ return "@" + UniqueAnnotation.class.getName() + "(value=" + value + ")";
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ if (obj == this) {
+ return true;
+ } else if (!(obj instanceof UniqueAnnotation)) {
+ return false;
+ }
+
+ UniqueAnnotation other = (UniqueAnnotation)obj;
+ return value == other.value();
+ }
+
+ @Override
+ public int hashCode() {
+ return (127*"value".hashCode()) ^ Long.valueOf(value).hashCode();
+ }
+ }
+
+ /**
+ * @return An {@link Annotation} that will be unequal to every other annotation.
+ */
+ public static Annotation create() {
+ return create(SEQUENCE.getAndIncrement());
+ }
+
+ @VisibleForTesting
+ static Annotation create(long value) {
+ return new UniqueAnnotationImpl(value);
+ }
+}