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The Android Open Source Project
2009-03-03 18:28:45 -08:00
parent 076357b856
commit d83a98f4ce
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204
sax/java/android/sax/Element.java
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/*
* Copyright (C) 2007 The Android Open Source Project
*
* 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 android.sax;
import org.xml.sax.Locator;
import org.xml.sax.SAXParseException;
import java.util.ArrayList;
import android.util.Log;
/**
* An XML element. Provides access to child elements and hooks to listen
* for events related to this element.
*
* @see RootElement
*/
public class Element {
final String uri;
final String localName;
final int depth;
final Element parent;
Children children;
ArrayList<Element> requiredChilden;
boolean visited;
StartElementListener startElementListener;
EndElementListener endElementListener;
EndTextElementListener endTextElementListener;
Element(Element parent, String uri, String localName, int depth) {
this.parent = parent;
this.uri = uri;
this.localName = localName;
this.depth = depth;
}
/**
* Gets the child element with the given name. Uses an empty string as the
* namespace.
*/
public Element getChild(String localName) {
return getChild("", localName);
}
/**
* Gets the child element with the given name.
*/
public Element getChild(String uri, String localName) {
if (endTextElementListener != null) {
throw new IllegalStateException("This element already has an end"
+ " text element listener. It cannot have children.");
}
if (children == null) {
children = new Children();
}
return children.getOrCreate(this, uri, localName);
}
/**
* Gets the child element with the given name. Uses an empty string as the
* namespace. We will throw a {@link org.xml.sax.SAXException} at parsing
* time if the specified child is missing. This helps you ensure that your
* listeners are called.
*/
public Element requireChild(String localName) {
return requireChild("", localName);
}
/**
* Gets the child element with the given name. We will throw a
* {@link org.xml.sax.SAXException} at parsing time if the specified child
* is missing. This helps you ensure that your listeners are called.
*/
public Element requireChild(String uri, String localName) {
Element child = getChild(uri, localName);
if (requiredChilden == null) {
requiredChilden = new ArrayList<Element>();
requiredChilden.add(child);
} else {
if (!requiredChilden.contains(child)) {
requiredChilden.add(child);
}
}
return child;
}
/**
* Sets start and end element listeners at the same time.
*/
public void setElementListener(ElementListener elementListener) {
setStartElementListener(elementListener);
setEndElementListener(elementListener);
}
/**
* Sets start and end text element listeners at the same time.
*/
public void setTextElementListener(TextElementListener elementListener) {
setStartElementListener(elementListener);
setEndTextElementListener(elementListener);
}
/**
* Sets a listener for the start of this element.
*/
public void setStartElementListener(
StartElementListener startElementListener) {
if (this.startElementListener != null) {
throw new IllegalStateException(
"Start element listener has already been set.");
}
this.startElementListener = startElementListener;
}
/**
* Sets a listener for the end of this element.
*/
public void setEndElementListener(EndElementListener endElementListener) {
if (this.endElementListener != null) {
throw new IllegalStateException(
"End element listener has already been set.");
}
this.endElementListener = endElementListener;
}
/**
* Sets a listener for the end of this text element.
*/
public void setEndTextElementListener(
EndTextElementListener endTextElementListener) {
if (this.endTextElementListener != null) {
throw new IllegalStateException(
"End text element listener has already been set.");
}
if (children != null) {
throw new IllegalStateException("This element already has children."
+ " It cannot have an end text element listener.");
}
this.endTextElementListener = endTextElementListener;
}
@Override
public String toString() {
return toString(uri, localName);
}
static String toString(String uri, String localName) {
return "'" + (uri.equals("") ? localName : uri + ":" + localName) + "'";
}
/**
* Clears flags on required children.
*/
void resetRequiredChildren() {
ArrayList<Element> requiredChildren = this.requiredChilden;
if (requiredChildren != null) {
for (int i = requiredChildren.size() - 1; i >= 0; i--) {
requiredChildren.get(i).visited = false;
}
}
}
/**
* Throws an exception if a required child was not present.
*/
void checkRequiredChildren(Locator locator) throws SAXParseException {
ArrayList<Element> requiredChildren = this.requiredChilden;
if (requiredChildren != null) {
for (int i = requiredChildren.size() - 1; i >= 0; i--) {
Element child = requiredChildren.get(i);
if (!child.visited) {
throw new BadXmlException(
"Element named " + this + " is missing required"
+ " child element named "
+ child + ".", locator);
}
}
}
}
}