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org.xmlbeam.AutoList Maven / Gradle / Ivy
The coolest XML library for Java around. Define typesafe views (projections) to xml. Use XPath to read and write XML. Bind XML to Java collections. Requires at least Java6, supports Java8 features and has no further runtime dependencies.
/**
* Copyright 2016 Sven Ewald
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.xmlbeam;
import java.util.AbstractList;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xmlbeam.dom.DOMAccess;
import org.xmlbeam.evaluation.DefaultXPathEvaluator;
import org.xmlbeam.evaluation.InvocationContext;
import org.xmlbeam.intern.DOMChangeListener;
import org.xmlbeam.types.XBAutoList;
import org.xmlbeam.util.intern.DOMHelper;
/**
*
*/
class AutoList extends AbstractList implements XBAutoList, DOMChangeListener {
static class EmptyAutoList extends AbstractList implements XBAutoList {
@Override
public F get(final int index) {
throw new IndexOutOfBoundsException();
}
@Override
public int size() {
return 0;
}
}
@SuppressWarnings("rawtypes")
private static final XBAutoList EMPTY = new EmptyAutoList();
private final InvocationContext invocationContext;
private Element parent;
private final Node baseNode;
private final List content = new ArrayList();
private final DomChangeTracker domChangeTracker = new DomChangeTracker() {
@Override
void refresh(final boolean forWrite) throws XPathExpressionException {
final NodeList nodes = (NodeList) invocationContext.getxPathExpression().evaluate(baseNode, XPathConstants.NODESET);
if ((nodes.getLength() == 0) && forWrite) {
parent = invocationContext.getDuplexExpression().ensureParentExistence(baseNode);
} else {
parent = nodes.getLength() == 0 ? null : (Element) nodes.item(0).getParentNode();
}
content.clear();
for (int i = 0; i < nodes.getLength(); ++i) {
content.add(nodes.item(i));
}
}
};
/**
* @param baseNode
* @param invocationContext
*/
public AutoList(final Node baseNode, final InvocationContext invocationContext) {
this.invocationContext = invocationContext;
this.baseNode = baseNode;
this.invocationContext.getProjector().addDOMChangeListener(this);
}
@Override
public E get(final int index) {
if (index < 0) {
throw new IndexOutOfBoundsException();
}
domChangeTracker.refreshForReadIfNeeded();
if (index >= content.size()) {
throw new IndexOutOfBoundsException();
}
return DefaultXPathEvaluator.convertToComponentType(invocationContext, content.get(index), invocationContext.getTargetComponentType());
}
@Override
public int size() {
domChangeTracker.refreshForReadIfNeeded();
return content.size();
}
@Override
public E set(final int index, final E element) {
if (index < 0) {
throw new IndexOutOfBoundsException();
}
domChangeTracker.refreshForReadIfNeeded();
if (index >= content.size()) {
throw new IndexOutOfBoundsException();
}
Node oldNode = content.get(index);
E result = DefaultXPathEvaluator.convertToComponentType(invocationContext, oldNode, invocationContext.getTargetComponentType());
if (element instanceof Node) {
Node newNode = ((Node) element).cloneNode(true);
oldNode.getParentNode().replaceChild(oldNode, newNode);
content.set(index, newNode);
return result;
}
if (element instanceof DOMAccess) {
Node newNode = ((DOMAccess) element).getDOMBaseElement().cloneNode(true);
oldNode.getParentNode().replaceChild(oldNode, newNode);
content.set(index, newNode);
return result;
}
final String asString = invocationContext.getProjector().config().getStringRenderer().render(element.getClass(), element, invocationContext.getDuplexExpression().getExpressionFormatPattern());
oldNode.setTextContent(asString);
return result;
}
@Override
public boolean add(final E e) {
if (e == null) {
return false;
}
if (parent == null) {
domChangeTracker.domChanged();
}
domChangeTracker.refreshForWriteIfNeeded();
if (e instanceof Node) {
content.add(DOMHelper.appendClone(parent, (Node) e));
return true;
}
if (e instanceof DOMAccess) {
content.add(DOMHelper.appendClone(parent, ((DOMAccess) e).getDOMBaseElement()));
return true;
}
Node newElement = invocationContext.getDuplexExpression().createChildWithPredicate(parent);
final String asString = invocationContext.getProjector().config().getStringRenderer().render(e.getClass(), e, invocationContext.getDuplexExpression().getExpressionFormatPattern());
newElement.setTextContent(asString);
parent.appendChild(newElement);
content.add(newElement);
return true;
}
@Override
public void add(final int index, final E o) {
if (o == null) {
throw new IllegalArgumentException("Can not add null to a ProjectedList. I don't know how to render that.");
}
domChangeTracker.refreshForWriteIfNeeded();
if ((index < 0) || (index > content.size())) {
throw new IndexOutOfBoundsException();
}
if (index == content.size()) {
add(o);
return;
}
Node previousNode = content.get(index);
if (o instanceof Node) {
Node newValue = ((Node) o).cloneNode(true);
previousNode.getParentNode().insertBefore(newValue, previousNode);
content.add(index, newValue);
return;
}
if (o instanceof DOMAccess) {
Node newValue = ((DOMAccess) o).getDOMBaseElement().cloneNode(true);
previousNode.getParentNode().insertBefore(newValue, previousNode);
content.add(index, newValue);
return;
}
Node newElement = invocationContext.getDuplexExpression().createChildWithPredicate(parent);
final String asString = invocationContext.getProjector().config().getStringRenderer().render(o.getClass(), o, invocationContext.getDuplexExpression().getExpressionFormatPattern());
newElement.setTextContent(asString);
parent.insertBefore(newElement, previousNode);
content.add(index, newElement);
}
@Override
public E remove(final int index) {
E result = get(index);
Node remove = content.remove(index);
Node p = remove.getParentNode();
if (p != null) {
p.removeChild(remove);
DOMHelper.trim(p);
}
return result;
};
@Override
public boolean remove(Object o) {
if (o == null) {
return false;
}
domChangeTracker.refreshForReadIfNeeded(); // No creation of parent wanted
if (content.isEmpty()) {
return false;
}
if (o instanceof DOMAccess) {
o = ((DOMAccess) o).getDOMBaseElement();
}
if (o instanceof Node) {
for (Node contentNode : content) {
if (DOMHelper.nodesAreEqual(contentNode, ((Node) o))) {
o = contentNode;
break;
}
}
boolean changed = content.remove(o);
if (changed) {
Node p = ((Node) o).getParentNode();
if (p != null) {
p.removeChild((Node) o);
}
DOMHelper.trim(p);
}
return changed;
}
final String asString = invocationContext.getProjector().config().getStringRenderer().render(o.getClass(), o, invocationContext.getDuplexExpression().getExpressionFormatPattern());
if (asString == null) {
return false;
}
for (ListIterator i = content.listIterator(); i.hasNext();) {
Node item = i.next();
if (!asString.equals(item.getTextContent())) {
continue;
}
final Node parentNode = item.getParentNode();
assert parentNode != null : "How can child be in list without parent?";
parentNode.removeChild(item);
DOMHelper.trim(parentNode);
i.remove();
return true;
}
return false;
}
@Override
public int indexOf(final Object o) {
if (!(o instanceof Node)) {
return super.indexOf(o);
}
domChangeTracker.refreshForReadIfNeeded();
Node oNode = (Node) o;
ListIterator e = content.listIterator();
while (e.hasNext()) {
if (DOMHelper.nodesAreEqual(oNode, e.next())) {
return e.previousIndex();
}
}
return -1;
}
@Override
public void domChanged() {
domChangeTracker.domChanged();
}
/**
* @return parent node holding the data nodes
*/
public Node getNode() {
domChangeTracker.refreshForReadIfNeeded();
return this.parent;
}
/**
* @return empty instance
*/
@SuppressWarnings("unchecked")
public static XBAutoList emptyList() {
return EMPTY;
}
}
