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Add AbstractListIterator and ImmutableListConverter classes to util module

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This commit is contained in:
Ben Gruver 2012-10-14 22:39:46 -07:00
parent f7ab3f9ade
commit cc15feab69
3 changed files with 184 additions and 0 deletions
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2
util/build.gradle
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@ -31,5 +31,7 @@
dependencies {
compile 'commons-cli:commons-cli:1.2'
compile 'com.google.code.findbugs:jsr305:1.3.9'
compile 'com.google.guava:guava:13.0.1'
testCompile 'junit:junit:4.6'
}

81
util/src/main/java/org/jf/util/AbstractListIterator.java Normal file
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@ -0,0 +1,81 @@
/*
* Copyright 2012, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.jf.util;
import java.util.ListIterator;
public abstract class AbstractListIterator<T> implements ListIterator<T> {
@Override
public boolean hasNext() {
throw new UnsupportedOperationException();
}
@Override
public T next() {
throw new UnsupportedOperationException();
}
@Override
public boolean hasPrevious() {
throw new UnsupportedOperationException();
}
@Override
public T previous() {
throw new UnsupportedOperationException();
}
@Override
public int nextIndex() {
throw new UnsupportedOperationException();
}
@Override
public int previousIndex() {
throw new UnsupportedOperationException();
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
@Override
public void set(T t) {
throw new UnsupportedOperationException();
}
@Override
public void add(T t) {
throw new UnsupportedOperationException();
}
}

101
util/src/main/java/org/jf/util/ImmutableListConverter.java Normal file
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@ -0,0 +1,101 @@
/*
* Copyright 2012, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.jf.util;
import com.google.common.collect.ImmutableList;
import javax.annotation.Nullable;
import java.util.Iterator;
import java.util.List;
/**
* This class converts a list of items to an immutable list of immutable items
*
* @param <ImmutableItem> The immutable version of the element
* @param <Item> The normal version of the element
*/
public abstract class ImmutableListConverter<ImmutableItem, Item> {
/**
* 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
* as-is
*
* @param list The list of items to convert
* @return An ImmutableList of ImmutableItem
*/
public ImmutableList<ImmutableItem> convert(@Nullable final List<? extends Item> list) {
if (list == null) {
return null;
}
boolean needsCopy = false;
if (list instanceof ImmutableList) {
for (Item element: list) {
if (isImmutable(element)) {
needsCopy = true;
break;
}
}
} else {
needsCopy = true;
}
if (!needsCopy) {
return (ImmutableList<ImmutableItem>)list;
}
return ImmutableList.copyOf(new Iterator<ImmutableItem>() {
protected int index = 0;
@Override
public boolean hasNext() {
return index < list.size();
}
@Override
public ImmutableItem next() {
ImmutableItem item = makeImmutable(list.get(index));
index++;
return item;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
});
}
protected abstract boolean isImmutable(Item item);
protected abstract ImmutableItem makeImmutable(Item item);
}