ContextReplace.java

/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.util;

import com.liferay.portal.kernel.util.StringUtil;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * @author Brian Wing Shun Chan
 */
public class ContextReplace implements Cloneable {

	public ContextReplace() {
		this(null);
	}

	public ContextReplace(Map<String, String> context) {
		if (context != null) {
			_context.putAll(context);

			_updateArrays();
		}
	}

	public void addValue(String key, String value) {
		if ((key != null) && (value != null)) {
			_context.put(key, value);

			_updateArrays();
		}
	}

	@Override
	public Object clone() {
		return new ContextReplace(_context);
	}

	public String replace(String text) {
		if (text == null) {
			return null;
		}

		if (_keys.length == 0) {
			return text;
		}

		return StringUtil.replace(text, _keys, _values);
	}

	private void _updateArrays() {
		List<String> keys = new ArrayList<>();
		List<String> values = new ArrayList<>();

		for (Map.Entry<String, String> entry : _context.entrySet()) {
			String entryKey = entry.getKey();
			String entryValue = entry.getValue();

			keys.add("${" + entryKey + "}");
			values.add(entryValue);
		}

		_keys = keys.toArray(new String[keys.size()]);
		_values = values.toArray(new String[values.size()]);
	}

	private final Map<String, String> _context = new LinkedHashMap<>();
	private String[] _keys = new String[0];
	private String[] _values = new String[0];

}