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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
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package org.scijava.util;
import java.util.Arrays;
import java.util.Collection;
import org.scijava.util.Types;
/**
* An extensible, generic array of {@code Object} elements. Note that this class
* is a {@link PrimitiveArray} but of course Objects are not primitives.
* However, this class still facilitates improved conversion of Object array
* types to collections, and thus remains useful (if not completely accurately
* congruent with its type hierarchy).
*
* This class still provides a convenient way to work around
* {@link Arrays#asList(Object...)} creating a list with a single element. It
* also contains improved performance implementations of many {@link Collection}
* methods.
*
*
* @author Mark Hiner
* @author Johannes Schindelin
* @author Curtis Rueden
*/
public class ObjectArray extends AbstractPrimitiveArray {
/** The backing array. */
private E[] array;
private Class objectClass;
/**
* Constructs an extensible array of objects, backed by a fixed-size array.
*/
public ObjectArray(Class arrayType) {
super(arrayType);
objectClass = arrayType;
}
/**
* Constructs an extensible array of objects, backed by a fixed-size array.
*
* @param size the initial size
*/
public ObjectArray(Class arrayType, final int size) {
super(arrayType, size);
objectClass = arrayType;
}
/**
* Constructs an extensible array of objects, backed by the given fixed-size
* array.
*
* @param array the array to wrap
*/
@SuppressWarnings("unchecked")
public ObjectArray(final E[] array) {
super((Class) array.getClass().getComponentType(), array);
objectClass = (Class) array.getClass().getComponentType();
}
// -- ObjectArray methods --
public void addValue(final E value) {
addValue(size(), value);
}
public boolean removeValue(final E value) {
final int index = indexOf(value);
if (index < 0) return false;
delete(index, 1);
return true;
}
public E getValue(final int index) {
checkBounds(index);
return array[index];
}
public E setValue(final int index, final E value) {
checkBounds(index);
final E oldValue = getValue(index);
array[index] = value;
return oldValue;
}
public void addValue(final int index, final E value) {
insert(index, 1);
array[index] = value;
}
// -- PrimitiveArray methods --
@Override
public E[] getArray() {
return array;
}
@Override
public void setArray(final E[] array) {
if (array.length < size()) {
throw new IllegalArgumentException("Array too small");
}
this.array = array;
}
// -- List methods --
@Override
public E get(final int index) {
return getValue(index);
}
@Override
public E set(final int index, final E element) {
return setValue(index, element == null ? defaultValue() : element);
}
@Override
public void add(final int index, final E element) {
addValue(index, element);
}
// NB: Overridden for performance.
@Override
public int indexOf(final Object o) {
if (!compatibleClass(o)) return -1;
for (int i = 0; i < size(); i++) {
if (array[i].equals(o)) return i;
}
return -1;
}
// NB: Overridden for performance.
@Override
public int lastIndexOf(final Object o) {
if (!compatibleClass(o)) return -1;
for (int i = size() - 1; i >= 0; i--) {
if (array[i].equals(o)) return i;
}
return -1;
}
// -- Collection methods --
// NB: Overridden for performance.
@Override
public boolean contains(final Object o) {
if (!compatibleClass(o)) return false;
return indexOf(o) >= 0;
}
// NB: Overridden for performance.
@Override
public boolean remove(final Object o) {
if (!compatibleClass(o)) return false;
final E value = Types.cast(o, objectClass);
return removeValue(value);
}
// NB: Overridden for performance.
@Override
public boolean containsAll(final Collection c) {
for (final Object o : c) {
if (!compatibleClass(o)) return false;
if (indexOf(o) < 0) return false;
}
return true;
}
// NB: Overridden for performance.
@Override
public boolean addAll(final int index, final Collection c) {
if (c.size() == 0) return false;
insert(index, c.size());
int i = index;
for (final E e : c) {
setValue(i++, e);
}
return true;
}
// NB: Overridden for performance.
@Override
public boolean removeAll(final Collection c) {
boolean changed = false;
for (final Object o : c) {
if (!compatibleClass(o)) continue;
final E value = Types.cast(o, objectClass);
final boolean result = removeValue(value);
if (result) changed = true;
}
return changed;
}
@Override
public E defaultValue() {
return null;
}
// -- Helper methods --
/**
* Returns true iff the given Object is non-null and its class matches the
* type of this array.
*/
private boolean compatibleClass(Object o) {
if (o != null && objectClass.isAssignableFrom(o.getClass())) return true;
return false;
}
}