content: /*
   * Copyright 2010-2025 Hyland Software, Inc. and its affiliates.
   *
   * 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.activiti.bpmn.converter;
  
  import java.util.Stack;
  import javax.xml.stream.XMLStreamException;
  import javax.xml.stream.XMLStreamWriter;
  
  /**
  
   */
  public class IndentingXMLStreamWriter extends DelegatingXMLStreamWriter {
  
      private static final Object SEEN_NOTHING = new Object();
      private static final Object SEEN_ELEMENT = new Object();
      private static final Object SEEN_DATA = new Object();
  
      private Object state = SEEN_NOTHING;
      private Stack<Object> stateStack = new Stack<Object>();
  
      private String indentStep = "  ";
      private int depth = 0;
  
      public IndentingXMLStreamWriter(XMLStreamWriter writer) {
          super(writer);
      }
  
      /**
       * Return the current indent step.
       *
       * <p>
       * Return the current indent step: each start tag will be indented by this number of spaces times the number of ancestors that the element has.
       * </p>
       *
       * @return The number of spaces in each indentation step, or 0 or less for no indentation.
       * @see #setIndentStep(int)
       *
       * @deprecated Only return the length of the indent string.
       */
      @Deprecated
      public int getIndentStep() {
          return indentStep.length();
      }
  
      /**
       * Set the current indent step.
       *
       * @param indentStep
       *          The new indent step (0 or less for no indentation).
       * @see #getIndentStep()
       *
       * @deprecated Should use the version that takes string.
       */
      @Deprecated
      public void setIndentStep(int indentStep) {
          StringBuilder s = new StringBuilder();
          for (; indentStep > 0; indentStep--) s.append(' ');
          setIndentStep(s.toString());
      }
  
      public void setIndentStep(String s) {
          this.indentStep = s;
      }
  
      private void onStartElement() throws XMLStreamException {
          stateStack.push(SEEN_ELEMENT);
          state = SEEN_NOTHING;
          if (depth > 0) {
              super.writeCharacters("\n");
          }
          doIndent();
          depth++;
      }
  
      private void onEndElement() throws XMLStreamException {
          depth--;
          if (state == SEEN_ELEMENT) {
              super.writeCharacters("\n");
              doIndent();
          }
          state = stateStack.pop();
      }
  
      private void onEmptyElement() throws XMLStreamException {
          state = SEEN_ELEMENT;
          if (depth > 0) {
              super.writeCharacters("\n");
          }
          doIndent();
      }
  
      /**
       * Print indentation for the current level.
       *
       * @exception org.xml.sax.SAXException
       *              If there is an error writing the indentation characters, or if a filter further down the chain raises an exception.
       */
      private void doIndent() throws XMLStreamException {
          if (depth > 0) {
              for (int i = 0; i < depth; i++) super.writeCharacters(indentStep);
          }
      }
  
      public void writeStartDocument() throws XMLStreamException {
          super.writeStartDocument();
          super.writeCharacters("\n");
      }
  
      public void writeStartDocument(String version) throws XMLStreamException {
          super.writeStartDocument(version);
          super.writeCharacters("\n");
      }
  
      public void writeStartDocument(String encoding, String version) throws XMLStreamException {
          super.writeStartDocument(encoding, version);
          super.writeCharacters("\n");
      }
  
      public void writeStartElement(String localName) throws XMLStreamException {
          onStartElement();
          super.writeStartElement(localName);
      }
  
      public void writeStartElement(String namespaceURI, String localName) throws XMLStreamException {
          onStartElement();
          super.writeStartElement(namespaceURI, localName);
      }
  
      public void writeStartElement(String prefix, String localName, String namespaceURI) throws XMLStreamException {
          onStartElement();
          super.writeStartElement(prefix, localName, namespaceURI);
      }
  
      public void writeEmptyElement(String namespaceURI, String localName) throws XMLStreamException {
          onEmptyElement();
          super.writeEmptyElement(namespaceURI, localName);
      }
  
      public void writeEmptyElement(String prefix, String localName, String namespaceURI) throws XMLStreamException {
          onEmptyElement();
          super.writeEmptyElement(prefix, localName, namespaceURI);
      }
  
      public void writeEmptyElement(String localName) throws XMLStreamException {
          onEmptyElement();
          super.writeEmptyElement(localName);
      }
  
      public void writeEndElement() throws XMLStreamException {
          onEndElement();
          super.writeEndElement();
      }
  
      public void writeCharacters(String text) throws XMLStreamException {
          state = SEEN_DATA;
          super.writeCharacters(text);
      }
  
      public void writeCharacters(char[] text, int start, int len) throws XMLStreamException {
          state = SEEN_DATA;
          super.writeCharacters(text, start, len);
      }
  
      public void writeCData(String data) throws XMLStreamException {
          state = SEEN_DATA;
          super.writeCData(data);
      }
  }
  