extracted FileChunkKey

platform/util/src/com/intellij/util/io/FileChunkKey.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2000-2015 JetBrains s.r.o.
+ *
+ * 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.intellij.util.io;
+
+import com.intellij.util.containers.ShareableKey;
+import org.jetbrains.annotations.NotNull;
+
+class FileChunkKey<OwnerType> implements Comparable<FileChunkKey<OwnerType>>, ShareableKey {
+  private OwnerType owner;
+  private long offset;
+
+  public FileChunkKey(OwnerType owner, long offset) {
+    this.owner = owner;
+    this.offset = offset;
+  }
+
+  public int hashCode() {
+    return (int)(owner.hashCode() * 31 + offset);
+  }
+
+  public OwnerType getOwner() {
+    return owner;
+  }
+
+  public long getOffset() {
+    return offset;
+  }
+
+  public boolean equals(final Object obj) {
+    if (getClass() != obj.getClass()) return false;
+    FileChunkKey<OwnerType> k = (FileChunkKey<OwnerType>)obj;
+    return k.owner == owner && k.offset == offset;
+  }
+
+  public void setup(OwnerType owner, long offset) {
+    this.owner = owner;
+    this.offset = offset;
+  }
+
+  @Override
+  public int compareTo(@NotNull final FileChunkKey<OwnerType> o) {
+    if (owner != o.owner) {
+      return owner.hashCode() - o.owner.hashCode();
+    }
+    return offset == o.offset ? 0 : offset - o.offset < 0 ? -1 : 1;
+  }
+
+  @Override
+  public ShareableKey getStableCopy() {
+    return new FileChunkKey<OwnerType>(owner, offset);
+  }
+}

platform/util/src/com/intellij/util/io/PoolPageKey.java

@@ -19,45 +19,8 @@
  */
 package com.intellij.util.io;
 
-import org.jetbrains.annotations.NotNull;
-
-class PoolPageKey implements Comparable<PoolPageKey> {
-  private RandomAccessDataFile owner;
-  private long offset;
-
+class PoolPageKey extends FileChunkKey<RandomAccessDataFile> {
   public PoolPageKey(final RandomAccessDataFile owner, final long offset) {
-    this.owner = owner;
-    this.offset = offset;
-  }
-
-  public int hashCode() {
-    return (int)(owner.hashCode() * 31 + offset);
-  }
-
-  public RandomAccessDataFile getOwner() {
-    return owner;
-  }
-
-  public long getOffset() {
-    return offset;
-  }
-
-  @SuppressWarnings({"EqualsWhichDoesntCheckParameterClass"})
-  public boolean equals(final Object obj) {
-    PoolPageKey k = (PoolPageKey)obj;
-    return k.owner == owner && k.offset == offset;
-  }
-
-  public void setup(RandomAccessDataFile owner, long offset) {
-    this.owner = owner;
-    this.offset = offset;
-  }
-
-  @Override
-  public int compareTo(@NotNull final PoolPageKey o) {
-    if (owner != o.owner) {
-      return owner.hashCode() - o.owner.hashCode();
-    }
-    return offset == o.offset ? 0 : offset - o.offset < 0 ? -1 : 1;
+    super(owner, offset);
   }
 }