org.apache.myfaces.shared_tomahawk.renderkit.html.util.UnicodeEncoder Maven / Gradle / Ivy

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JSF components and utilities that can be used with any JSF implementation. This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build changes to take advantage of JSF2.1 features. A JSF2.1 implementation is required to use this version of the Tomahawk library.
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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.
 */
package org.apache.myfaces.shared_tomahawk.renderkit.html.util;

import java.io.IOException;
import java.io.Writer;

/**
 * Converts characters outside of latin-1 set in a string to numeric character references.
 * 
 */
public abstract class UnicodeEncoder
{
    /**
     * Encodes the given string, so that it can be used within a html page.
     * @param string the string to convert
     */
    public static String encode (String string)
    {
        if (string == null)
        {
            return "";
        }

        StringBuilder sb = null;
        char c;
        for (int i = 0; i < string.length (); ++i)
        {
            c = string.charAt(i);
            if (((int)c) >= 0x80)
            {
                if( sb == null )
                {
                    sb = new StringBuilder( string.length()+4 );
                    sb.append( string.substring(0,i) );
                }
                //encode all non basic latin characters
                sb.append("&#");
                sb.append((int)c);
                sb.append(";");
            }
            else if( sb != null )
            {
                sb.append(c);
            }
        }

        return sb != null ? sb.toString() : string;
    }
    
    public static void encode (Writer writer, String string) throws IOException
    {
        if (string == null)
        {
            return;
        }

        int start = 0;
        char c;
        for (int i = 0; i < string.length (); ++i)
        {
            c = string.charAt(i);
            if (((int)c) >= 0x80)
            {
                if (start < i)
                {
                    writer.write(string, start, i-start);
                }
                start = i+1;
                //encode all non basic latin characters
                writer.write("&#");
                writer.write(Integer.toString((int)c));
                writer.write(";");
            }
        }

        if (start == 0)
        {
            writer.write(string);
        }
        else if (start < string.length())
        {
            writer.write(string,start,string.length()-start);
        }
    }

    public static void encode (Writer writer, char[] cbuf, int off, int len) throws IOException
    {
        if (cbuf == null)
        {
            return;
        }

        int start = off;
        char c;
        for (int i = off; i < off+len; ++i)
        {
            c = cbuf[i];
            if (((int)c) >= 0x80)
            {
                if (start < i)
                {
                    writer.write(cbuf, start, i-start);
                }
                start = i+1;
                //encode all non basic latin characters
                writer.write("&#");
                writer.write(Integer.toString((int)c));
                writer.write(";");
            }
        }

        if (start == off)
        {
            writer.write(cbuf, off, len);
        }
        else if (start < off+len)
        {
            writer.write(cbuf,start,off+len-start);
        }
    }
    
    public static void encode (Writer writer, String cbuf, int off, int len) throws IOException
    {
        if (cbuf == null)
        {
            return;
        }

        int start = off;
        char c;
        for (int i = off; i < off+len; ++i)
        {
            c = cbuf.charAt(i);
            if (((int)c) >= 0x80)
            {
                if (start < i)
                {
                    writer.write(cbuf, start, i-start);
                }
                start = i+1;
                //encode all non basic latin characters
                writer.write("&#");
                writer.write(Integer.toString((int)c));
                writer.write(";");
            }
        }

        if (start == off)
        {
            writer.write(cbuf, off, len);
        }
        else if (start < off+len)
        {
            writer.write(cbuf,start,off+len-start);
        }
    }
}