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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.
*/
/*
* $Id: FunctionTable.java 468655 2006-10-28 07:12:06Z minchau $
*/
package org.apache.xpath.compiler;
import org.apache.xpath.Expression;
import org.apache.xpath.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] = org.apache.xpath.functions.FuncCurrent.class;
m_functions[FUNC_LAST] = org.apache.xpath.functions.FuncLast.class;
m_functions[FUNC_POSITION] = org.apache.xpath.functions.FuncPosition.class;
m_functions[FUNC_COUNT] = org.apache.xpath.functions.FuncCount.class;
m_functions[FUNC_ID] = org.apache.xpath.functions.FuncId.class;
m_functions[FUNC_KEY] =
org.apache.xalan.templates.FuncKey.class;
m_functions[FUNC_LOCAL_PART] =
org.apache.xpath.functions.FuncLocalPart.class;
m_functions[FUNC_NAMESPACE] =
org.apache.xpath.functions.FuncNamespace.class;
m_functions[FUNC_QNAME] = org.apache.xpath.functions.FuncQname.class;
m_functions[FUNC_GENERATE_ID] =
org.apache.xpath.functions.FuncGenerateId.class;
m_functions[FUNC_NOT] = org.apache.xpath.functions.FuncNot.class;
m_functions[FUNC_TRUE] = org.apache.xpath.functions.FuncTrue.class;
m_functions[FUNC_FALSE] = org.apache.xpath.functions.FuncFalse.class;
m_functions[FUNC_BOOLEAN] = org.apache.xpath.functions.FuncBoolean.class;
m_functions[FUNC_LANG] = org.apache.xpath.functions.FuncLang.class;
m_functions[FUNC_NUMBER] = org.apache.xpath.functions.FuncNumber.class;
m_functions[FUNC_FLOOR] = org.apache.xpath.functions.FuncFloor.class;
m_functions[FUNC_CEILING] = org.apache.xpath.functions.FuncCeiling.class;
m_functions[FUNC_ROUND] = org.apache.xpath.functions.FuncRound.class;
m_functions[FUNC_SUM] = org.apache.xpath.functions.FuncSum.class;
m_functions[FUNC_STRING] = org.apache.xpath.functions.FuncString.class;
m_functions[FUNC_STARTS_WITH] =
org.apache.xpath.functions.FuncStartsWith.class;
m_functions[FUNC_CONTAINS] = org.apache.xpath.functions.FuncContains.class;
m_functions[FUNC_SUBSTRING_BEFORE] =
org.apache.xpath.functions.FuncSubstringBefore.class;
m_functions[FUNC_SUBSTRING_AFTER] =
org.apache.xpath.functions.FuncSubstringAfter.class;
m_functions[FUNC_NORMALIZE_SPACE] =
org.apache.xpath.functions.FuncNormalizeSpace.class;
m_functions[FUNC_TRANSLATE] =
org.apache.xpath.functions.FuncTranslate.class;
m_functions[FUNC_CONCAT] = org.apache.xpath.functions.FuncConcat.class;
m_functions[FUNC_SYSTEM_PROPERTY] =
org.apache.xpath.functions.FuncSystemProperty.class;
m_functions[FUNC_EXT_FUNCTION_AVAILABLE] =
org.apache.xpath.functions.FuncExtFunctionAvailable.class;
m_functions[FUNC_EXT_ELEM_AVAILABLE] =
org.apache.xpath.functions.FuncExtElementAvailable.class;
m_functions[FUNC_SUBSTRING] =
org.apache.xpath.functions.FuncSubstring.class;
m_functions[FUNC_STRING_LENGTH] =
org.apache.xpath.functions.FuncStringLength.class;
m_functions[FUNC_DOCLOCATION] =
org.apache.xpath.functions.FuncDoclocation.class;
m_functions[FUNC_UNPARSED_ENTITY_URI] =
org.apache.xpath.functions.FuncUnparsedEntityURI.class;
}
static{
m_functionID.put(Keywords.FUNC_CURRENT_STRING,
new Integer(FunctionTable.FUNC_CURRENT));
m_functionID.put(Keywords.FUNC_LAST_STRING,
new Integer(FunctionTable.FUNC_LAST));
m_functionID.put(Keywords.FUNC_POSITION_STRING,
new Integer(FunctionTable.FUNC_POSITION));
m_functionID.put(Keywords.FUNC_COUNT_STRING,
new Integer(FunctionTable.FUNC_COUNT));
m_functionID.put(Keywords.FUNC_ID_STRING,
new Integer(FunctionTable.FUNC_ID));
m_functionID.put(Keywords.FUNC_KEY_STRING,
new Integer(FunctionTable.FUNC_KEY));
m_functionID.put(Keywords.FUNC_LOCAL_PART_STRING,
new Integer(FunctionTable.FUNC_LOCAL_PART));
m_functionID.put(Keywords.FUNC_NAMESPACE_STRING,
new Integer(FunctionTable.FUNC_NAMESPACE));
m_functionID.put(Keywords.FUNC_NAME_STRING,
new Integer(FunctionTable.FUNC_QNAME));
m_functionID.put(Keywords.FUNC_GENERATE_ID_STRING,
new Integer(FunctionTable.FUNC_GENERATE_ID));
m_functionID.put(Keywords.FUNC_NOT_STRING,
new Integer(FunctionTable.FUNC_NOT));
m_functionID.put(Keywords.FUNC_TRUE_STRING,
new Integer(FunctionTable.FUNC_TRUE));
m_functionID.put(Keywords.FUNC_FALSE_STRING,
new Integer(FunctionTable.FUNC_FALSE));
m_functionID.put(Keywords.FUNC_BOOLEAN_STRING,
new Integer(FunctionTable.FUNC_BOOLEAN));
m_functionID.put(Keywords.FUNC_LANG_STRING,
new Integer(FunctionTable.FUNC_LANG));
m_functionID.put(Keywords.FUNC_NUMBER_STRING,
new Integer(FunctionTable.FUNC_NUMBER));
m_functionID.put(Keywords.FUNC_FLOOR_STRING,
new Integer(FunctionTable.FUNC_FLOOR));
m_functionID.put(Keywords.FUNC_CEILING_STRING,
new Integer(FunctionTable.FUNC_CEILING));
m_functionID.put(Keywords.FUNC_ROUND_STRING,
new Integer(FunctionTable.FUNC_ROUND));
m_functionID.put(Keywords.FUNC_SUM_STRING,
new Integer(FunctionTable.FUNC_SUM));
m_functionID.put(Keywords.FUNC_STRING_STRING,
new Integer(FunctionTable.FUNC_STRING));
m_functionID.put(Keywords.FUNC_STARTS_WITH_STRING,
new Integer(FunctionTable.FUNC_STARTS_WITH));
m_functionID.put(Keywords.FUNC_CONTAINS_STRING,
new Integer(FunctionTable.FUNC_CONTAINS));
m_functionID.put(Keywords.FUNC_SUBSTRING_BEFORE_STRING,
new Integer(FunctionTable.FUNC_SUBSTRING_BEFORE));
m_functionID.put(Keywords.FUNC_SUBSTRING_AFTER_STRING,
new Integer(FunctionTable.FUNC_SUBSTRING_AFTER));
m_functionID.put(Keywords.FUNC_NORMALIZE_SPACE_STRING,
new Integer(FunctionTable.FUNC_NORMALIZE_SPACE));
m_functionID.put(Keywords.FUNC_TRANSLATE_STRING,
new Integer(FunctionTable.FUNC_TRANSLATE));
m_functionID.put(Keywords.FUNC_CONCAT_STRING,
new Integer(FunctionTable.FUNC_CONCAT));
m_functionID.put(Keywords.FUNC_SYSTEM_PROPERTY_STRING,
new Integer(FunctionTable.FUNC_SYSTEM_PROPERTY));
m_functionID.put(Keywords.FUNC_EXT_FUNCTION_AVAILABLE_STRING,
new Integer(FunctionTable.FUNC_EXT_FUNCTION_AVAILABLE));
m_functionID.put(Keywords.FUNC_EXT_ELEM_AVAILABLE_STRING,
new Integer(FunctionTable.FUNC_EXT_ELEM_AVAILABLE));
m_functionID.put(Keywords.FUNC_SUBSTRING_STRING,
new Integer(FunctionTable.FUNC_SUBSTRING));
m_functionID.put(Keywords.FUNC_STRING_LENGTH_STRING,
new Integer(FunctionTable.FUNC_STRING_LENGTH));
m_functionID.put(Keywords.FUNC_UNPARSED_ENTITY_URI_STRING,
new Integer(FunctionTable.FUNC_UNPARSED_ENTITY_URI));
m_functionID.put(Keywords.FUNC_DOCLOCATION_STRING,
new Integer(FunctionTable.FUNC_DOCLOCATION));
}
public FunctionTable(){
}
/**
* Return the name of the a function in the static table. Needed to avoid
* making the table publicly available.
*/
String getFunctionName(int funcID) {
if (funcID < NUM_BUILT_IN_FUNCS) return m_functions[funcID].getName();
else return m_functions_customer[funcID - NUM_BUILT_IN_FUNCS].getName();
}
/**
* Obtain a new Function object from a function ID.
*
* @param which The function ID, which may correspond to one of the FUNC_XXX
* values found in {@link org.apache.xpath.compiler.FunctionTable}, but may
* be a value installed by an external module.
*
* @return a a new Function instance.
*
* @throws javax.xml.transform.TransformerException if ClassNotFoundException,
* IllegalAccessException, or InstantiationException is thrown.
*/
Function getFunction(int which)
throws javax.xml.transform.TransformerException
{
try{
if (which < NUM_BUILT_IN_FUNCS)
return (Function) m_functions[which].newInstance();
else
return (Function) m_functions_customer[
which-NUM_BUILT_IN_FUNCS].newInstance();
}catch (IllegalAccessException ex){
throw new TransformerException(ex.getMessage());
}catch (InstantiationException ex){
throw new TransformerException(ex.getMessage());
}
}
/**
* Obtain a function ID from a given function name
* @param key the function name in a java.lang.String format.
* @return a function ID, which may correspond to one of the FUNC_XXX values
* found in {@link org.apache.xpath.compiler.FunctionTable}, but may be a
* value installed by an external module.
*/
Object getFunctionID(String key){
Object id = m_functionID_customer.get(key);
if (null == id) id = m_functionID.get(key);
return id;
}
/**
* Install a built-in function.
* @param name The unqualified name of the function, must not be null
* @param func A Implementation of an XPath Function object.
* @return the position of the function in the internal index.
*/
public int installFunction(String name, Class func)
{
int funcIndex;
Object funcIndexObj = getFunctionID(name);
if (null != funcIndexObj)
{
funcIndex = ((Integer) funcIndexObj).intValue();
if (funcIndex < NUM_BUILT_IN_FUNCS){
funcIndex = m_funcNextFreeIndex++;
m_functionID_customer.put(name, new Integer(funcIndex));
}
m_functions_customer[funcIndex - NUM_BUILT_IN_FUNCS] = func;
}
else
{
funcIndex = m_funcNextFreeIndex++;
m_functions_customer[funcIndex-NUM_BUILT_IN_FUNCS] = func;
m_functionID_customer.put(name,
new Integer(funcIndex));
}
return funcIndex;
}
/**
* Tell if a built-in, non-namespaced function is available.
*
* @param methName The local name of the function.
*
* @return True if the function can be executed.
*/
public boolean functionAvailable(String methName)
{
Object tblEntry = m_functionID.get(methName);
if (null != tblEntry) return true;
else{
tblEntry = m_functionID_customer.get(methName);
return (null != tblEntry)? true : false;
}
}
}
