/**
 * Copyright 2008-2009 DRIVER PROJECT (ICM UW)
 * Original author: Marek Horst
 *
 * 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: Utils.java 5239 2008-03-17 09:00:00Z icmdriver $

package org.z3950.zing.cql;


/**
 * Utility functions for the org.z3950.zing.cql package.
 * Not intended for use outside this package.
 *
 * @version	$Id: Utils.java 5239 2008-03-17 09:00:00Z icmdriver $
 */
class Utils {
    static String indent(int level) {
	String x = "";
	while (level-- > 0) {
	    x += "  ";
	}
	return x;
    }

    // XML Quote --
    //	s/&/&/g;
    //	s/</&lt;/g;
    //	s/>/&gt;/g;
    // This is hideously inefficient, but I just don't see a better
    // way using the standard JAVA library.
    //
    static String xq(String str) {
	str = replaceString(str, "&", "&amp;");
	str = replaceString(str, "<", "&lt;");
	str = replaceString(str, ">", "&gt;");
	return str;
    }

    // I can't _believe_ I have to write this by hand in 2002 ...
    static String replaceString(String str, String from, String to) {
	StringBuffer sb = new StringBuffer();
	int ix;			// index of next `from'
	int offset = 0;		// index of previous `from' + length(from)

	while ((ix = str.indexOf(from, offset)) != -1) {
	    sb.append(str.substring(offset, ix));
	    sb.append(to);
	    offset = ix + from.length();
	}

	// End of string: append last bit and we're done
	sb.append(str.substring(offset));
	return sb.toString();
    }
}