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XmlBlob.java
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/* Copyright (c) 2008 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 com.google.gdata.util;
import com.google.gdata.util.common.xml.XmlNamespace;
import com.google.gdata.util.common.xml.XmlWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
/**
* Arbitrary self-contained block of XML.
*
*
*/
public class XmlBlob {
/**
* Initial {@code xml:lang} value. This value is typically inherited through
* the XML tree. The blob itself may contain overrides.
* <p>
*
* See http://www.w3.org/TR/REC-xml/#sec-lang-tag for more information.
*/
protected String lang;
public String getLang() { return lang; }
public void setLang(String v) { lang = v; }
/**
* Initial {@code xml:base} value. This value is typically inherited through
* the XML tree. The blob itself may contain overrides.
* <p>
*
* See http://www.cafeconleche.org/books/xmljava/chapters/ch03s03.html for
* more information.
*/
protected String base;
public String getBase() { return base; }
public void setBase(String v) { base = v; }
/**
* Namespace declarations inherited when this blob was parsed but used
* within it.
*/
protected LinkedList<XmlNamespace> namespaces =
new LinkedList<XmlNamespace>();
public List<XmlNamespace> getNamespaces() {
return namespaces;
}
public boolean addNamespace(XmlNamespace namespace) {
return namespaces.add(namespace);
}
/**
* Contents of the blob. Depending on how the blob was parsed, it may contain
* top-level text() nodes mixed together with child elements.
*/
protected String blob;
public String getBlob() { return blob; }
public void setBlob(String v) { blob = v; }
/**
* Contains strings from {@code blob} for full-text indexing.
* Valid only when this blob comes from {@link XmlParser}.
*/
protected String fullText;
public String getFullText() { return fullText; }
public void setFullText(String v) { fullText = v; }
/** Generates an element opening tag containing an XML blob. */
public static void startElement(XmlWriter w,
XmlNamespace namespace,
String elementName,
XmlBlob xml,
Collection<XmlWriter.Attribute>
additionalAttrs,
Collection<XmlNamespace> additionalNs)
throws IOException {
Collection<XmlWriter.Attribute> attrs;
Collection<XmlNamespace> namespaces;
if (xml != null) {
String lang = xml.getLang();
String base = xml.getBase();
if (lang != null || base != null) {
attrs = new ArrayList<XmlWriter.Attribute>();
if (additionalAttrs != null) {
attrs.addAll(additionalAttrs);
}
if (lang != null) {
attrs.add(new XmlWriter.Attribute("xml:lang", lang));
}
if (base != null) {
attrs.add(new XmlWriter.Attribute("xml:base", base));
}
} else { assert lang == null && base == null;
attrs = additionalAttrs;
}
List<XmlNamespace> blobNamespaces = xml.getNamespaces();
int additionalNsSize = (additionalNs == null ? 0 : additionalNs.size());
if (blobNamespaces.size() == 0 && additionalNsSize == 0) {
namespaces = null;
} else {
namespaces = new ArrayList<XmlNamespace>(additionalNsSize +
blobNamespaces.size());
// Blob namespaces have to go first, because we depend on their aliases
// being preserved. If an additional namespace has a conflicting alias,
// we want the additional namespace to get an arbitrarily generated
// alias, not the blob's.
for (XmlNamespace blobNs : blobNamespaces) {
namespaces.add(new XmlNamespace(blobNs.getAlias(),
blobNs.getUri()));
}
if (additionalNs != null) {
namespaces.addAll(additionalNs);
}
}
} else { assert xml == null;
attrs = additionalAttrs;
namespaces = additionalNs;
}
w.startElement(namespace, elementName, attrs, namespaces);
}
/** Generates an element closing tag containing an XML blob. */
public static void endElement(XmlWriter w,
XmlNamespace namespace,
String elementName,
XmlBlob xml) throws IOException {
if (xml != null && xml.getBlob() != null) {
w.innerXml(xml.getBlob());
}
w.endElement(namespace, elementName);
}
}