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Change ImmutableList.convert to return an empty list rather than null

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This commit is contained in:
Ben Gruver 2012-10-15 22:13:19 -07:00
parent a8d9abfc24
commit 22eede870f
1 changed files with 6 additions and 4 deletions
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10
util/src/main/java/org/jf/util/ImmutableListConverter.java
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@ -33,6 +33,7 @@ package org.jf.util;
import com.google.common.collect.ImmutableList; import com.google.common.collect.ImmutableList;
import javax.annotation.Nonnull;
import javax.annotation.Nullable; import javax.annotation.Nullable;
import java.util.Iterator; import java.util.Iterator;
import java.util.List; import java.util.List;
@ -48,14 +49,15 @@ public abstract class ImmutableListConverter<ImmutableItem, Item> {
* Converts a {@code List} of {@code Item}s to an {@code ImmutableList} of {@code ImmutableItem}s. * Converts a {@code List} of {@code Item}s to an {@code ImmutableList} of {@code ImmutableItem}s.
* *
* If the provided list is already an ImmutableList of ImmutableItems, then the list is not copied and is returned * If the provided list is already an ImmutableList of ImmutableItems, then the list is not copied and is returned
* as-is * as-is. If the list is null, an empty ImmutableList will be returned
* *
* @param list The list of items to convert * @param list The list of items to convert.
* @return An ImmutableList of ImmutableItem * @return An ImmutableList of ImmutableItem. If list is null, an empty list will be returned.
*/ */
@Nonnull
public ImmutableList<ImmutableItem> convert(@Nullable final List<? extends Item> list) { public ImmutableList<ImmutableItem> convert(@Nullable final List<? extends Item> list) {
if (list == null) { if (list == null) {
return null; return ImmutableList.of();
} }
boolean needsCopy = false; boolean needsCopy = false;