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introduce explaining variable refactoring. #170

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20 changes: 13 additions & 7 deletions io/src/main/java/org/apache/pdfbox/io/IOUtils.java
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,7 @@
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles.Lookup;

import java.lang.invoke.MethodType;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;
Expand Down Expand Up @@ -237,15 +238,20 @@ private static Consumer<ByteBuffer> unmapper()
*/
final MethodHandle cleanMethod = lookup.findVirtual(cleanerClass, "clean",
methodType(void.class));
final MethodHandle nonNullTest = lookup
.findStatic(Objects.class, "nonNull",
methodType(boolean.class, Object.class))
.asType(methodType(boolean.class, cleanerClass));

final MethodType objectType = methodType(boolean.class, Object.class);
final MethodType cleanerType = methodType(boolean.class, cleanerClass);
final MethodHandle nonNullMethodHandle = lookup
.findStatic(Objects.class, "nonNull", objectType);
final MethodHandle nonNullTest = nonNullMethodHandle.asType(cleanerType);

final MethodHandle noop = dropArguments(
constant(Void.class, null).asType(methodType(void.class)), 0, cleanerClass);
final MethodHandle unmapper = filterReturnValue(directBufferCleanerMethod,
guardWithTest(nonNullTest, cleanMethod, noop))
.asType(methodType(void.class, ByteBuffer.class));
final MethodType voidBufferType = methodType(void.class, ByteBuffer.class);
final MethodHandle guardMethodHandle = guardWithTest(nonNullTest, cleanMethod, noop);
final MethodHandle unmapper = filterReturnValue(directBufferCleanerMethod, guardMethodHandle)
.asType(voidBufferType);

return newBufferCleaner(directBufferClass, unmapper);
}
}
Expand Down