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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: XStringForChars.java 468655 2006-10-28 07:12:06Z minchau $
*/
package org.apache.xpath.objects;
import org.apache.xalan.res.XSLMessages;
import org.apache.xml.utils.FastStringBuffer;
import org.apache.xpath.res.XPATHErrorResources;
/**
* This class will wrap a FastStringBuffer and allow for
*/
public class XStringForChars extends XString
{
static final long serialVersionUID = -2235248887220850467L;
/** The start position in the fsb. */
int m_start;
/** The length of the string. */
int m_length;
protected String m_strCache = null;
/**
* Construct a XNodeSet object.
*
* @param val FastStringBuffer object this will wrap, must be non-null.
* @param start The start position in the array.
* @param length The number of characters to read from the array.
*/
public XStringForChars(char[] val, int start, int length)
{
super(val);
m_start = start;
m_length = length;
if(null == val)
throw new IllegalArgumentException(
XSLMessages.createXPATHMessage(XPATHErrorResources.ER_FASTSTRINGBUFFER_CANNOT_BE_NULL, null)); //"The FastStringBuffer argument can not be null!!");
}
/**
* Construct a XNodeSet object.
*
* @param val String object this will wrap.
*/
private XStringForChars(String val)
{
super(val);
throw new IllegalArgumentException(
XSLMessages.createXPATHMessage(XPATHErrorResources.ER_XSTRINGFORCHARS_CANNOT_TAKE_STRING, null)); //"XStringForChars can not take a string for an argument!");
}
/**
* Cast result object to a string.
*
* @return The string this wraps or the empty string if null
*/
public FastStringBuffer fsb()
{
throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_FSB_NOT_SUPPORTED_XSTRINGFORCHARS, null)); //"fsb() not supported for XStringForChars!");
}
/**
* Cast result object to a string.
*
* @return The string this wraps or the empty string if null
*/
public void appendToFsb(org.apache.xml.utils.FastStringBuffer fsb)
{
fsb.append((char[])m_obj, m_start, m_length);
}
/**
* Tell if this object contains a java String object.
*
* @return true if this XMLString can return a string without creating one.
*/
public boolean hasString()
{
return (null != m_strCache);
}
/**
* Cast result object to a string.
*
* @return The string this wraps or the empty string if null
*/
public String str()
{
if(null == m_strCache)
m_strCache = new String((char[])m_obj, m_start, m_length);
return m_strCache;
}
/**
* Since this object is incomplete without the length and the offset, we
* have to convert to a string when this function is called.
*
* @return The java String representation of this object.
*/
public Object object()
{
return str();
}
/**
* Directly call the
* characters method on the passed ContentHandler for the
* string-value. Multiple calls to the
* ContentHandler's characters methods may well occur for a single call to
* this method.
*
* @param ch A non-null reference to a ContentHandler.
*
* @throws org.xml.sax.SAXException
*/
public void dispatchCharactersEvents(org.xml.sax.ContentHandler ch)
throws org.xml.sax.SAXException
{
ch.characters((char[])m_obj, m_start, m_length);
}
/**
* Directly call the
* comment method on the passed LexicalHandler for the
* string-value.
*
* @param lh A non-null reference to a LexicalHandler.
*
* @throws org.xml.sax.SAXException
*/
public void dispatchAsComment(org.xml.sax.ext.LexicalHandler lh)
throws org.xml.sax.SAXException
{
lh.comment((char[])m_obj, m_start, m_length);
}
/**
* Returns the length of this string.
*
* @return the length of the sequence of characters represented by this
* object.
*/
public int length()
{
return m_length;
}
/**
* Returns the character at the specified index. An index ranges
* from 0 to length() - 1. The first character
* of the sequence is at index 0, the next at index
* 1, and so on, as for array indexing.
*
* @param index the index of the character.
* @return the character at the specified index of this string.
* The first character is at index 0.
* @exception IndexOutOfBoundsException if the index
* argument is negative or not less than the length of this
* string.
*/
public char charAt(int index)
{
return ((char[])m_obj)[index+m_start];
}
/**
* Copies characters from this string into the destination character
* array.
*
* @param srcBegin index of the first character in the string
* to copy.
* @param srcEnd index after the last character in the string
* to copy.
* @param dst the destination array.
* @param dstBegin the start offset in the destination array.
* @exception IndexOutOfBoundsException If any of the following
* is true:
*
srcBegin is negative.
*
srcBegin is greater than srcEnd
*
srcEnd is greater than the length of this
* string
*
dstBegin is negative
*
dstBegin+(srcEnd-srcBegin) is larger than
* dst.length
* @exception NullPointerException if dst is null
*/
public void getChars(int srcBegin, int srcEnd, char dst[], int dstBegin)
{
System.arraycopy((char[])m_obj, m_start+srcBegin, dst, dstBegin, srcEnd);
}
}
