/**
* Copyright 2010 Google Inc.
*
* 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.waveprotocol.wave.model.document.parser;
import org.waveprotocol.wave.model.util.CollectionUtils;
import org.waveprotocol.wave.model.util.Preconditions;
import org.waveprotocol.wave.model.util.StringMap;
/**
* Item type compatible with XmlPullParser interface
*
*/
class Item {
final ItemType type;
final String name;
final StringMap<String> attrs;
final String data;
/**
* @param tagName
* @param attrList
* @return element start item
*/
public static Item elementStart(String tagName, StringMap<String> attrList) {
return new Item(ItemType.START_ELEMENT, tagName, attrList, null);
}
/**
* @param closingName
* @return element end item
*/
public static Item elementEnd(String closingName) {
return new Item(ItemType.END_ELEMENT, closingName, null, null);
}
/**
* @param name
* @param value
* @return processing instruction item
*/
public static Item processingInstruction(String name, String value) {
return new Item(ItemType.PROCESSING_INSTRUCTION, name, null, value);
}
/**
* @param text
* @return text item
*/
public static Item text(String text) {
return new Item(ItemType.TEXT, null, null, text);
}
/**
* @return an end element that corresponds to this start element.
*/
public Item startElementToEndElement() {
Preconditions.checkState(type == ItemType.START_ELEMENT,
"Can only convert start elements to end elements");
return new Item(ItemType.END_ELEMENT, name, null, null);
}
/**
* @param type
* @param name
* @param attrs
* @param data
*/
public Item(ItemType type, String name, StringMap<String> attrs, String data) {
this.type = type;
this.name = name;
this.attrs = attrs == null || attrs.isEmpty() ? null : CollectionUtils.copyStringMap(attrs);
this.data = data;
}
String getProcessingInstructionName() {
checkAtProcessingInstruction();
return name;
}
String getProcessingInstructionValue() {
checkAtProcessingInstruction();
return data;
}
String getTagName() {
checkAtElement();
return name;
}
String getText() {
checkAtText();
return data;
}
Item copy() {
Item copy = new Item(type, name, attrs, data);
return copy;
}
StringMap<String> getAttributes() {
checkAtElementStart();
if (attrs == null) {
return CollectionUtils.emptyMap();
}
return attrs;
}
private void checkAtProcessingInstruction() {
Preconditions.checkState(type == ItemType.PROCESSING_INSTRUCTION,
"Cursor not at processing instruction");
}
private void checkAtElement() {
Preconditions.checkState(type == ItemType.START_ELEMENT || type == ItemType.END_ELEMENT,
"Cursor not at element");
}
private void checkAtElementStart() {
Preconditions.checkState(type == ItemType.START_ELEMENT, "Cursor not at element start");
}
private void checkAtText() {
Preconditions.checkState(type == ItemType.TEXT, "Cursor not at text");
}
}