SchemaAttributeHandler.java :  » IDE-Eclipse » pde » org » eclipse » pde » internal » core » schema » Java Open Source

/*******************************************************************************
 *  Copyright (c) 2006, 2008 IBM Corporation and others.
 *  All rights reserved. This program and the accompanying materials
 *  are made available under the terms of the Eclipse Public License v1.0
 *  which accompanies this distribution, and is available at
 *  http://www.eclipse.org/legal/epl-v10.html
 * 
 *  Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.pde.internal.core.schema;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

/**
 * AttributeDescriptionHandler
 * 
 */
public class SchemaAttributeHandler extends BaseSchemaHandler {

  private String fElementName;

  private String fAttributeName;

  private String fTargetElementName;

  private String fTargetAttributeName;

  private StringBuffer fDescription;

  private final static String[] DESC_NESTED_ELEM = {"documentation", //$NON-NLS-1$
      "annotation", "attribute", "complexType", "element"}; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$

  private final static String NAME_ATTR = "name"; //$NON-NLS-1$  

  /**
   * 
   */
  public SchemaAttributeHandler(String targetElementName, String targetAttributeName) {
    super();
    setTargetElementName(targetElementName);
    setTargetAttributeName(targetAttributeName);
  }

  public void setTargetElementName(String targetElementName) {
    fTargetElementName = targetElementName;
  }

  public void setTargetAttributeName(String targetAttributeName) {
    fTargetAttributeName = targetAttributeName;
  }

  protected void reset() {
    super.reset();
    fDescription = new StringBuffer();
    fElementName = null;
    fAttributeName = null;
  }

  public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
    super.startElement(uri, localName, qName, attributes);
    if (qName.compareTo(DESC_NESTED_ELEM[4]) == 0) {
      // Element
      // Remember the last element that had a name attribute
      // Element references are ignored
      if ((attributes != null) && (attributes.getValue(NAME_ATTR) != null)) {
        fElementName = attributes.getValue(NAME_ATTR);
      }
    } else if (qName.compareTo(DESC_NESTED_ELEM[2]) == 0) {
      // Attribute
      // Remember the last attribute
      if (attributes != null) {
        fAttributeName = attributes.getValue(NAME_ATTR);
      }
    }
  }

  public void characters(char[] ch, int start, int length) throws SAXException {

    if (onTarget()) {
      for (int i = 0; i < length; i++) {
        fDescription.append(ch[start + i]);
      }
    }
  }

  protected boolean onTarget() {
    if (fElementList.size() >= DESC_NESTED_ELEM.length) {
      for (int i = 0; i < DESC_NESTED_ELEM.length; i++) {
        String currentElement = (String) fElementList.get(i);
        if (currentElement.compareTo(DESC_NESTED_ELEM[i]) != 0) {
          return false;
        }
      }
      if ((fElementName == null) || (fElementName.compareTo(fTargetElementName) != 0)) {
        return false;
      }
      if ((fAttributeName == null) || (fAttributeName.compareTo(fTargetAttributeName) != 0)) {
        return false;
      }
      return true;
    }
    return false;
  }

  public String getDescription() {
    return fDescription.toString();
  }

}