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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
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 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 * file and include the License file at LICENSE.txt.
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 * Modifications:
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package com.sun.codemodel.util;

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

/**
 * {@link Writer} that escapes non US-ASCII characters into
 * Java Unicode escape \\uXXXX.
 * 
 * This process is necessary if the method names or field names
 * contain non US-ASCII characters.
 * 
 * @author
 * 	Kohsuke Kawaguchi ([email protected])
 */
public class UnicodeEscapeWriter extends FilterWriter {
    
    public UnicodeEscapeWriter( Writer next ) {
        super(next);
    }

    public final void write(int ch) throws IOException {
        if(!requireEscaping(ch))  out.write(ch);
        else {
            // need to escape
            out.write("\\u");
            String s = Integer.toHexString(ch);
            for( int i=s.length(); i<4; i++ )
                out.write('0');
            out.write(s);
        }
    }

    /**
     * Can be overrided. Return true if the character
     * needs to be escaped. 
     */
    protected boolean requireEscaping(int ch) {
        if(ch>=128)     return true;
        
        // control characters
        if( ch<0x20 && " \t\r\n".indexOf(ch)==-1 )  return true;
        
        return false;
    }
    
    public final void write(char[] buf, int off, int len) throws IOException {
        for( int i=0; i