Replace ConfigurationTransition with PatchTransition in a few places.

RELNOTES: None.
PiperOrigin-RevId: 194459347

src/main/java/com/google/devtools/build/lib/analysis/config/ComposingRuleTransitionFactory.java

diff --git a/src/main/java/com/google/devtools/build/lib/analysis/config/ComposingRuleTransitionFactory.java b/src/main/java/com/google/devtools/build/lib/analysis/config/ComposingRuleTransitionFactory.java
index e56f036..ca23d24 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/config/ComposingRuleTransitionFactory.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/config/ComposingRuleTransitionFactory.java
@@ -17,7 +17,6 @@
 
 import com.google.common.base.Preconditions;
 import com.google.devtools.build.lib.analysis.config.transitions.ComposingPatchTransition;
-import com.google.devtools.build.lib.analysis.config.transitions.ConfigurationTransition;
 import com.google.devtools.build.lib.analysis.config.transitions.NoTransition;
 import com.google.devtools.build.lib.analysis.config.transitions.PatchTransition;
 import com.google.devtools.build.lib.packages.Rule;
@@ -41,11 +40,9 @@
   }
 
   @Override
-  public ConfigurationTransition buildTransitionFor(Rule rule) {
-    PatchTransition transition1 =
-        (PatchTransition) Preconditions.checkNotNull(rtf1.buildTransitionFor(rule));
-    PatchTransition transition2 =
-        (PatchTransition) Preconditions.checkNotNull(rtf2.buildTransitionFor(rule));
+  public PatchTransition buildTransitionFor(Rule rule) {
+    PatchTransition transition1 = Preconditions.checkNotNull(rtf1.buildTransitionFor(rule));
+    PatchTransition transition2 = Preconditions.checkNotNull(rtf2.buildTransitionFor(rule));
 
     if (transition1 == NoTransition.INSTANCE) {
       return transition2;

src/main/java/com/google/devtools/build/lib/analysis/config/TransitionResolver.java

diff --git a/src/main/java/com/google/devtools/build/lib/analysis/config/TransitionResolver.java b/src/main/java/com/google/devtools/build/lib/analysis/config/TransitionResolver.java
index 0afc7f9..946f959 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/config/TransitionResolver.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/config/TransitionResolver.java
@@ -222,9 +222,8 @@
     }
     if (transitionFactory != null) {
       PatchTransition ruleClassTransition =
-          (PatchTransition)
-              Preconditions.checkNotNull(
-                  transitionFactory.buildTransitionFor(toTarget.getAssociatedRule()));
+          Preconditions.checkNotNull(
+              transitionFactory.buildTransitionFor(toTarget.getAssociatedRule()));
       if (currentTransition == NoTransition.INSTANCE) {
         return ruleClassTransition;
       } else if (ruleClassTransition != NoTransition.INSTANCE) {

src/main/java/com/google/devtools/build/lib/packages/RuleClass.java

diff --git a/src/main/java/com/google/devtools/build/lib/packages/RuleClass.java b/src/main/java/com/google/devtools/build/lib/packages/RuleClass.java
index 4795e61..d423ea2 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/RuleClass.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/RuleClass.java
@@ -31,6 +31,7 @@
 import com.google.common.collect.Lists;
 import com.google.common.collect.Ordering;
 import com.google.devtools.build.lib.analysis.config.transitions.ConfigurationTransition;
+import com.google.devtools.build.lib.analysis.config.transitions.PatchTransition;
 import com.google.devtools.build.lib.cmdline.Label;
 import com.google.devtools.build.lib.cmdline.LabelSyntaxException;
 import com.google.devtools.build.lib.cmdline.PackageIdentifier;
@@ -553,15 +554,15 @@
     @AutoCodec.VisibleForSerialization
     @AutoCodec
     static final class FixedTransitionFactory implements RuleTransitionFactory {
-      private final ConfigurationTransition transition;
+      private final PatchTransition transition;
 
       @AutoCodec.VisibleForSerialization
-      FixedTransitionFactory(ConfigurationTransition transition) {
+      FixedTransitionFactory(PatchTransition transition) {
         this.transition = transition;
       }
 
       @Override
-      public ConfigurationTransition buildTransitionFor(Rule rule) {
+      public PatchTransition buildTransitionFor(Rule rule) {
         return transition;
       }
     }
@@ -895,13 +896,10 @@
     /**
      * Applies the given transition to all incoming edges for this rule class.
      *
-     * <p>The given transition must be a PatchTransition.  We use the more general Transition
-     * here because PatchTransition is not available in this package.
-     *
      * <p>If you need the transition to depend on the rule it's being applied to, use
      * {@link #cfg(RuleTransitionFactory)}.
      */
-    public Builder cfg(ConfigurationTransition transition) {
+    public Builder cfg(PatchTransition transition) {
       Preconditions.checkState(type != RuleClassType.ABSTRACT,
           "Setting not inherited property (cfg) of abstract rule class '%s'", name);
       Preconditions.checkState(this.transitionFactory == null,

src/main/java/com/google/devtools/build/lib/packages/RuleTransitionFactory.java

diff --git a/src/main/java/com/google/devtools/build/lib/packages/RuleTransitionFactory.java b/src/main/java/com/google/devtools/build/lib/packages/RuleTransitionFactory.java
index 555ff97..e449253 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/RuleTransitionFactory.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/RuleTransitionFactory.java
@@ -14,7 +14,7 @@
 
 package com.google.devtools.build.lib.packages;
 
-import com.google.devtools.build.lib.analysis.config.transitions.ConfigurationTransition;
+import com.google.devtools.build.lib.analysis.config.transitions.PatchTransition;
 
 /**
  * Customizable transition which accepts the rule it will be executing on.
@@ -23,10 +23,8 @@
   /**
    * Generates a transition to be used when entering the given rule.
    *
-   * <p>This transition must be a PatchTransition, but that class is not accessible in this package.
-   *
    * <p>If this class determines that no transition should be performed, it should return
    * {@code NoTransition.INSTANCE}.
    */
-  ConfigurationTransition buildTransitionFor(Rule rule);
+  PatchTransition buildTransitionFor(Rule rule);
 }