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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.xml.security.stax.impl.stax;

import org.apache.xml.security.stax.ext.stax.XMLSecCharacters;
import org.apache.xml.security.stax.ext.stax.XMLSecStartElement;

import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import java.io.IOException;
import java.io.Writer;

/**
 * @author $Author: giger $
 * @version $Revision: 1659901 $ $Date: 2015-02-15 09:11:24 +0000 (Sun, 15 Feb 2015) $
 */
public class XMLSecCharactersImpl extends XMLSecEventBaseImpl implements XMLSecCharacters {

    private String data;
    private char[] text;
    private final boolean isCData;
    private final boolean isIgnorableWhiteSpace;
    private final boolean isWhiteSpace;

    public XMLSecCharactersImpl(String data, boolean isCData, boolean isIgnorableWhiteSpace, boolean isWhiteSpace, XMLSecStartElement parentXmlSecStartElement) {
        this.data = data;
        this.isCData = isCData;
        this.isIgnorableWhiteSpace = isIgnorableWhiteSpace;
        this.isWhiteSpace = isWhiteSpace;
        setParentXMLSecStartElement(parentXmlSecStartElement);
    }

    public XMLSecCharactersImpl(char[] text, boolean isCData, boolean isIgnorableWhiteSpace, boolean isWhiteSpace, XMLSecStartElement parentXmlSecStartElement) {
        this.text = text;
        this.isCData = isCData;
        this.isIgnorableWhiteSpace = isIgnorableWhiteSpace;
        this.isWhiteSpace = isWhiteSpace;
        setParentXMLSecStartElement(parentXmlSecStartElement);
    }

    @Override
    public String getData() {
        if (data == null) {
            data = new String(text);
        }
        return data;
    }

    @Override
    public char[] getText() {
        if (text == null) {
            text = data.toCharArray();
        }
        return text;
    }

    @Override
    public boolean isWhiteSpace() {
        return isWhiteSpace;
    }

    @Override
    public boolean isCData() {
        return isCData;
    }

    @Override
    public boolean isIgnorableWhiteSpace() {
        return isIgnorableWhiteSpace;
    }

    @Override
    public int getEventType() {
        if (isCData) {
            return XMLStreamConstants.CDATA;
        }
        return XMLStreamConstants.CHARACTERS;
    }

    @Override
    public boolean isCharacters() {
        return true;
    }

    @Override
    public XMLSecCharacters asCharacters() {
        return this;
    }

    @Override
    public void writeAsEncodedUnicode(Writer writer) throws XMLStreamException {
        try {
            if (isCData) {
                writer.write("");
            } else {
                writeEncoded(writer, getText());
            }
        } catch (IOException e) {
            throw new XMLStreamException(e);
        }
    }

    private void writeEncoded(Writer writer, char[] text) throws IOException {
        final int length = text.length;

        int i = 0;
        int idx = 0;
        while (i < length) {
            char c = text[i];
            switch (c) {
                case '<':
                    writer.write(text, idx, i - idx);
                    writer.write("<");
                    idx = i + 1;
                    break;
                case '>':
                    writer.write(text, idx, i - idx);
                    writer.write(">");
                    idx = i + 1;
                    break;
                case '&':
                    writer.write(text, idx, i - idx);
                    writer.write("&");
                    idx = i + 1;
                    break;
            }
            i++;
        }
        writer.write(text, idx, length - idx);
    }
}