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-rw-r--r--guava/src/com/google/common/reflect/TypeParameter.java67
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diff --git a/guava/src/com/google/common/reflect/TypeParameter.java b/guava/src/com/google/common/reflect/TypeParameter.java
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+/*
+ * Copyright (C) 2011 The Guava Authors
+ *
+ * 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 com.google.common.reflect;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import com.google.common.annotations.Beta;
+
+import java.lang.reflect.Type;
+import java.lang.reflect.TypeVariable;
+
+import javax.annotation.Nullable;
+
+/**
+ * Captures a free type variable that can be used in {@link TypeToken#where}.
+ * For example: <pre> {@code
+ *
+ * static <T> TypeToken<List<T>> listOf(Class<T> elementType) {
+ * return new TypeToken<List<T>>() {}
+ * .where(new TypeParameter<T>() {}, elementType);
+ * }
+ * }</pre>
+ *
+ * @author Ben Yu
+ * @since 12.0
+ */
+@Beta
+public abstract class TypeParameter<T> extends TypeCapture<T> {
+
+ final TypeVariable<?> typeVariable;
+
+ protected TypeParameter() {
+ Type type = capture();
+ checkArgument(type instanceof TypeVariable, "%s should be a type variable.", type);
+ this.typeVariable = (TypeVariable<?>) type;
+ }
+
+ @Override public final int hashCode() {
+ return typeVariable.hashCode();
+ }
+
+ @Override public final boolean equals(@Nullable Object o) {
+ if (o instanceof TypeParameter) {
+ TypeParameter<?> that = (TypeParameter<?>) o;
+ return typeVariable.equals(that.typeVariable);
+ }
+ return false;
+ }
+
+ @Override public String toString() {
+ return typeVariable.toString();
+ }
+}