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/*******************************************************************************
* Copyright (c) 2007, 2009 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.internal.model.value;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import org.eclipse.jpt.common.utility.internal.CollectionTools;
import org.eclipse.jpt.common.utility.internal.StringTools;
import org.eclipse.jpt.common.utility.internal.iterators.ReadOnlyCompositeListIterator;
import org.eclipse.jpt.common.utility.internal.iterators.ReadOnlyListIterator;
import org.eclipse.jpt.common.utility.model.event.ListAddEvent;
import org.eclipse.jpt.common.utility.model.event.ListChangeEvent;
import org.eclipse.jpt.common.utility.model.event.ListClearEvent;
import org.eclipse.jpt.common.utility.model.event.ListMoveEvent;
import org.eclipse.jpt.common.utility.model.event.ListRemoveEvent;
import org.eclipse.jpt.common.utility.model.event.ListReplaceEvent;
import org.eclipse.jpt.common.utility.model.value.ListValueModel;
/**
* This wrapper extends a {@link ListValueModel} (or {@link CollectionValueModel})
* with fixed collections of items on either end.
* <p>
* <strong>NB:</strong> Be careful using or wrapping this list value model, since the
* "extended" items may be unexpected by the client code or wrapper.
*/
public class ExtendedListValueModelWrapper<E>
extends ListValueModelWrapper<E>
implements ListValueModel<E>
{
/** the items "prepended" to the wrapped list */
protected List<E> prefix;
/** the items "appended" to the wrapped list */
protected List<E> suffix;
// ********** lots o' constructors **********
/**
* Extend the specified list with a prefix and suffix.
*/
public ExtendedListValueModelWrapper(List<? extends E> prefix, ListValueModel<? extends E> listHolder, List<? extends E> suffix) {
super(listHolder);
this.prefix = new ArrayList<E>(prefix);
this.suffix = new ArrayList<E>(suffix);
}
/**
* Extend the specified list with a prefix and suffix.
*/
public ExtendedListValueModelWrapper(E prefix, ListValueModel<? extends E> listHolder, E suffix) {
super(listHolder);
this.prefix = Collections.singletonList(prefix);
this.suffix = Collections.singletonList(suffix);
}
/**
* Extend the specified list with a prefix.
*/
public ExtendedListValueModelWrapper(List<? extends E> prefix, ListValueModel<? extends E> listHolder) {
super(listHolder);
this.prefix = new ArrayList<E>(prefix);
this.suffix = Collections.emptyList();
}
/**
* Extend the specified list with a prefix.
*/
public ExtendedListValueModelWrapper(E prefix, ListValueModel<? extends E> listHolder) {
super(listHolder);
this.prefix = Collections.singletonList(prefix);
this.suffix = Collections.emptyList();
}
/**
* Extend the specified list with a suffix.
*/
public ExtendedListValueModelWrapper(ListValueModel<? extends E> listHolder, List<? extends E> suffix) {
super(listHolder);
this.prefix = Collections.emptyList();
this.suffix = new ArrayList<E>(suffix);
}
/**
* Extend the specified list with a suffix.
*/
public ExtendedListValueModelWrapper(ListValueModel<? extends E> listHolder, E suffix) {
super(listHolder);
this.prefix = Collections.emptyList();
this.suffix = Collections.singletonList(suffix);
}
/**
* Extend the specified list with a prefix containing a single null item.
*/
public ExtendedListValueModelWrapper(ListValueModel<? extends E> listHolder) {
super(listHolder);
this.prefix = Collections.singletonList(null);
this.suffix = Collections.emptyList();
}
// ********** ListValueModel implementation **********
public Iterator<E> iterator() {
return this.listIterator();
}
public ListIterator<E> listIterator() {
return new ReadOnlyListIterator<E>(this.listIterator_());
}
@SuppressWarnings("unchecked")
protected ListIterator<E> listIterator_() {
return new ReadOnlyCompositeListIterator<E>(
this.prefix.listIterator(),
this.listHolder.listIterator(),
this.suffix.listIterator()
);
}
public E get(int index) {
int prefixSize = this.prefix.size();
if (index < prefixSize) {
return this.prefix.get(index);
} else if (index >= prefixSize + this.listHolder.size()) {
return this.suffix.get(index - (prefixSize + this.listHolder.size()));
} else {
return this.listHolder.get(index - prefixSize);
}
}
public int size() {
return this.prefix.size() + this.listHolder.size() + this.suffix.size();
}
public Object[] toArray() {
ArrayList<E> list = new ArrayList<E>(this.size());
list.addAll(this.prefix);
CollectionTools.addAll(list, this.listHolder.iterator());
list.addAll(this.suffix);
return list.toArray();
}
// ********** ListValueModelWrapper implementation/overrides **********
@Override
protected void itemsAdded(ListAddEvent event) {
this.fireItemsAdded(event.clone(this, LIST_VALUES, this.prefix.size()));
}
@Override
protected void itemsRemoved(ListRemoveEvent event) {
this.fireItemsRemoved(event.clone(this, LIST_VALUES, this.prefix.size()));
}
@Override
protected void itemsReplaced(ListReplaceEvent event) {
this.fireItemsReplaced(event.clone(this, LIST_VALUES, this.prefix.size()));
}
@Override
protected void itemsMoved(ListMoveEvent event) {
this.fireItemsMoved(event.clone(this, LIST_VALUES, this.prefix.size()));
}
@Override
protected void listCleared(ListClearEvent event) {
this.fireListChanged(LIST_VALUES, this.buildList()); // not "cleared"
}
@Override
protected void listChanged(ListChangeEvent event) {
this.fireListChanged(LIST_VALUES, this.buildList());
}
@Override
public void toString(StringBuilder sb) {
StringTools.append(sb, this);
}
// ********** miscellaneous **********
public void setPrefix(List<E> prefix) {
this.prefix = prefix;
this.fireListChanged(LIST_VALUES, this.buildList());
}
public void setSuffix(List<E> suffix) {
this.suffix = suffix;
this.fireListChanged(LIST_VALUES, this.buildList());
}
private List<E> buildList() {
return CollectionTools.list(this.listIterator_());
}
}
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