functiontable.java

java1.6众多例子参考

/*
 * Copyright 1999-2005 The Apache Software Foundation.
 *
 * 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.
 */
/*
 * $Id: FunctionTable.java,v 1.3 2005/09/28 13:49:34 pvedula Exp $
 */
package com.sun.org.apache.xpath.internal.compiler;

import com.sun.org.apache.xpath.internal.Expression;
import com.sun.org.apache.xpath.internal.functions.Function;
import java.util.HashMap;
import javax.xml.transform.TransformerException;

/**
 * The function table for XPath.
 */
public class FunctionTable
{

  /** The 'current()' id. */
  public static final int FUNC_CURRENT = 0;

  /** The 'last()' id. */
  public static final int FUNC_LAST = 1;

  /** The 'position()' id. */
  public static final int FUNC_POSITION = 2;

  /** The 'count()' id. */
  public static final int FUNC_COUNT = 3;

  /** The 'id()' id. */
  public static final int FUNC_ID = 4;

  /** The 'key()' id (XSLT). */
  public static final int FUNC_KEY = 5;

  /** The 'local-name()' id. */
  public static final int FUNC_LOCAL_PART = 7;

  /** The 'namespace-uri()' id. */
  public static final int FUNC_NAMESPACE = 8;

  /** The 'name()' id. */
  public static final int FUNC_QNAME = 9;

  /** The 'generate-id()' id. */
  public static final int FUNC_GENERATE_ID = 10;

  /** The 'not()' id. */
  public static final int FUNC_NOT = 11;

  /** The 'true()' id. */
  public static final int FUNC_TRUE = 12;

  /** The 'false()' id. */
  public static final int FUNC_FALSE = 13;

  /** The 'boolean()' id. */
  public static final int FUNC_BOOLEAN = 14;

  /** The 'number()' id. */
  public static final int FUNC_NUMBER = 15;

  /** The 'floor()' id. */
  public static final int FUNC_FLOOR = 16;

  /** The 'ceiling()' id. */
  public static final int FUNC_CEILING = 17;

  /** The 'round()' id. */
  public static final int FUNC_ROUND = 18;

  /** The 'sum()' id. */
  public static final int FUNC_SUM = 19;

  /** The 'string()' id. */
  public static final int FUNC_STRING = 20;

  /** The 'starts-with()' id. */
  public static final int FUNC_STARTS_WITH = 21;

  /** The 'contains()' id. */
  public static final int FUNC_CONTAINS = 22;

  /** The 'substring-before()' id. */
  public static final int FUNC_SUBSTRING_BEFORE = 23;

  /** The 'substring-after()' id. */
  public static final int FUNC_SUBSTRING_AFTER = 24;

  /** The 'normalize-space()' id. */
  public static final int FUNC_NORMALIZE_SPACE = 25;

  /** The 'translate()' id. */
  public static final int FUNC_TRANSLATE = 26;

  /** The 'concat()' id. */
  public static final int FUNC_CONCAT = 27;

  /** The 'substring()' id. */
  public static final int FUNC_SUBSTRING = 29;

  /** The 'string-length()' id. */
  public static final int FUNC_STRING_LENGTH = 30;

  /** The 'system-property()' id. */
  public static final int FUNC_SYSTEM_PROPERTY = 31;

  /** The 'lang()' id. */
  public static final int FUNC_LANG = 32;

  /** The 'function-available()' id (XSLT). */
  public static final int FUNC_EXT_FUNCTION_AVAILABLE = 33;

  /** The 'element-available()' id (XSLT). */
  public static final int FUNC_EXT_ELEM_AVAILABLE = 34;

  /** The 'unparsed-entity-uri()' id (XSLT). */
  public static final int FUNC_UNPARSED_ENTITY_URI = 36;

  // Proprietary

  /** The 'document-location()' id (Proprietary). */
  public static final int FUNC_DOCLOCATION = 35;

  /**
   * The function table.
   */
  private static Class m_functions[];

  /** Table of function name to function ID associations. */
  private static HashMap m_functionID = new HashMap();
    
  /**
   * The function table contains customized functions
   */
  private Class m_functions_customer[] = new Class[NUM_ALLOWABLE_ADDINS];

  /**
   * Table of function name to function ID associations for customized functions
   */
  private HashMap m_functionID_customer = new HashMap();
  
  /**
   * Number of built in functions.  Be sure to update this as
   * built-in functions are added.
   */
  private static final int NUM_BUILT_IN_FUNCS = 37;

  /**
   * Number of built-in functions that may be added.
   */
  private static final int NUM_ALLOWABLE_ADDINS = 30;

  /**
   * The index to the next free function index.
   */
  private int m_funcNextFreeIndex = NUM_BUILT_IN_FUNCS;
  
  static
  {
    m_functions = new Class[NUM_BUILT_IN_FUNCS];
    m_functions[FUNC_CURRENT] = com.sun.org.apache.xpath.internal.functions.FuncCurrent.class;
    m_functions[FUNC_LAST] = com.sun.org.apache.xpath.internal.functions.FuncLast.class;
    m_functions[FUNC_POSITION] = com.sun.org.apache.xpath.internal.functions.FuncPosition.class;
    m_functions[FUNC_COUNT] = com.sun.org.apache.xpath.internal.functions.FuncCount.class;
    m_functions[FUNC_ID] = com.sun.org.apache.xpath.internal.functions.FuncId.class;
    // J2SE does not support Xalan interpretive
    // m_functions[FUNC_KEY] =
    //   com.sun.org.apache.xalan.internal.templates.FuncKey.class;
    m_functions[FUNC_LOCAL_PART] = 
      com.sun.org.apache.xpath.internal.functions.FuncLocalPart.class;
    m_functions[FUNC_NAMESPACE] = 
      com.sun.org.apache.xpath.internal.functions.FuncNamespace.class;
    m_functions[FUNC_QNAME] = com.sun.org.apache.xpath.internal.functions.FuncQname.class;
    m_functions[FUNC_GENERATE_ID] = 
      com.sun.org.apache.xpath.internal.functions.FuncGenerateId.class;
    m_functions[FUNC_NOT] = com.sun.org.apache.xpath.internal.functions.FuncNot.class;
    m_functions[FUNC_TRUE] = com.sun.org.apache.xpath.internal.functions.FuncTrue.class;
    m_functions[FUNC_FALSE] = com.sun.org.apache.xpath.internal.functions.FuncFalse.class;
    m_functions[FUNC_BOOLEAN] = com.sun.org.apache.xpath.internal.functions.FuncBoolean.class;
    m_functions[FUNC_LANG] = com.sun.org.apache.xpath.internal.functions.FuncLang.class;
    m_functions[FUNC_NUMBER] = com.sun.org.apache.xpath.internal.functions.FuncNumber.class;
    m_functions[FUNC_FLOOR] = com.sun.org.apache.xpath.internal.functions.FuncFloor.class;
    m_functions[FUNC_CEILING] = com.sun.org.apache.xpath.internal.functions.FuncCeiling.class;
    m_functions[FUNC_ROUND] = com.sun.org.apache.xpath.internal.functions.FuncRound.class;
    m_functions[FUNC_SUM] = com.sun.org.apache.xpath.internal.functions.FuncSum.class;
    m_functions[FUNC_STRING] = com.sun.org.apache.xpath.internal.functions.FuncString.class;
    m_functions[FUNC_STARTS_WITH] = 
      com.sun.org.apache.xpath.internal.functions.FuncStartsWith.class;
    m_functions[FUNC_CONTAINS] = com.sun.org.apache.xpath.internal.functions.FuncContains.class;