com.amazonaws.util.XMLWriter Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of aws-java-sdk-core Show documentation
Show all versions of aws-java-sdk-core Show documentation
The AWS SDK for Java - Core module holds the classes that are used by the individual service clients to interact with Amazon Web Services. Users need to depend on aws-java-sdk artifact for accessing individual client classes.
/*
* Copyright 2011-2024 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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.amazonaws.util;
import java.io.IOException;
import java.io.Writer;
import java.nio.ByteBuffer;
import java.util.Date;
import java.util.Stack;
import com.amazonaws.SdkClientException;
/**
* Utility for creating easily creating XML documents, one element at a time.
*/
public class XMLWriter {
/** Standard XML prolog to add to the beginning of each XML document. */
private static final String PROLOG = "";
/** The writer to which the XML document created by this writer will be written. */
private final Writer writer;
/** Optional XML namespace attribute value to include in the root element. */
private final String xmlns;
private Stack elementStack = new Stack();
private boolean rootElement = true;
/**
* Creates a new XMLWriter, ready to write an XML document to the specified
* writer. The XML document will not specify an xmlns attribute.
*
* @param w
* The writer this XMLWriter will write to.
*/
public XMLWriter(Writer w) {
this(w, null);
}
/**
* Creates a new XMLWriter, ready to write an XML document to the specified
* writer. The root element in the XML document will specify an xmlns
* attribute with the specified namespace parameter.
*
* @param w
* The writer this XMLWriter will write to.
* @param xmlns
* The XML namespace to include in the xmlns attribute of the
* root element.
*/
public XMLWriter(Writer w, String xmlns) {
this.writer = w;
this.xmlns = xmlns;
append(PROLOG);
}
/**
* Starts a new element with the specified name at the current position in
* the in-progress XML document.
*
* @param element
* The name of the new element.
*
* @return This XMLWriter so that additional method calls can be chained
* together.
*/
public XMLWriter startElement(String element) {
append("<" + element);
if (rootElement && xmlns != null) {
append(" xmlns=\"" + xmlns + "\"");
rootElement = false;
}
append(">");
elementStack.push(element);
return this;
}
/**
* Closes the last opened element at the current position in the in-progress
* XML document.
*
* @return This XMLWriter so that additional method calls can be chained
* together.
*/
public XMLWriter endElement() {
String lastElement = elementStack.pop();
append("");
return this;
}
/**
* Adds the specified value as text to the current position of the in
* progress XML document.
*
* @param s
* The text to add to the XML document.
*
* @return This XMLWriter so that additional method calls can be chained
* together.
*/
public XMLWriter value(String s) {
append(escapeXMLEntities(s));
return this;
}
/**
* Adds the specified value as Base64 encoded text to the current position of the in
* progress XML document.
*
* @param b
* The binary data to add to the XML document.
*
* @return This XMLWriter so that additional method calls can be chained
* together.
*/
public XMLWriter value(ByteBuffer b) {
append(escapeXMLEntities(Base64.encodeAsString(BinaryUtils.copyBytesFrom(b))));
return this;
}
/**
* Adds the specified date as text to the current position of the
* in-progress XML document.
*
* @param date
* The date to add to the XML document.
*
* @return This XMLWriter so that additional method calls can be chained
* together.
*/
public XMLWriter value(Date date) {
append(escapeXMLEntities(StringUtils.fromDate(date)));
return this;
}
/**
* Adds the string representation of the specified object to the current
* position of the in progress XML document.
*
* @param obj
* The object to translate to a string and add to the XML
* document.
*
* @return This XMLWriter so that additional method calls can be chained
* together.
*/
public XMLWriter value(Object obj) {
append(escapeXMLEntities(obj.toString()));
return this;
}
private void append(String s) {
try {
writer.append(s);
} catch (IOException e) {
throw new SdkClientException("Unable to write XML document", e);
}
}
private String escapeXMLEntities(String s) {
/**
* Unescape any escaped characters.
*/
if (s.contains("&")) {
s = s.replace(""", "\"");
s = s.replace("'", "'");
s = s.replace("<", "<");
s = s.replace(">", ">");
// Ampersands should always be the last to unescape
s = s.replace("&", "&");
}
// Ampersands should always be the first to escape
s = s.replace("&", "&");
s = s.replace("\"", """);
s = s.replace("'", "'");
s = s.replace("<", "<");
s = s.replace(">", ">");
return s;
}
}