net.java.ao.schema.OrderedProperties Maven / Gradle / Ivy

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/*
 * Copyright 2007 Daniel Spiewak
 * 
 * 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.
 */
package net.java.ao.schema;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * TODO	convert this to use {@link LinkedHashMap}
 *
 * @author Daniel Spiewak
 */
class OrderedProperties extends HashMap implements Iterable {
    private static final long serialVersionUID = 2L;
    private final List keyList;

    private OrderedProperties() {
        keyList = new LinkedList();
    }

    static OrderedProperties load(String resource) {
        final OrderedProperties p = new OrderedProperties();
        final InputStream is = OrderedProperties.class.getResourceAsStream(resource);
        try {
            p.load(is);
        } catch (IOException e) {
            throw new IllegalStateException(e);
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                // ignored
            }
        }
        return p;
    }

    private void load(InputStream inStream) throws IOException {
        load(new InputStreamReader(inStream));
    }

    private void load(Reader reader) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(reader);
        Pattern pattern = Pattern.compile("([^#].+)=([^#\\r\\n]+)");

        String line;
        while ((line = bufferedReader.readLine()) != null) {
            Matcher matcher = pattern.matcher(line);
            if (matcher.find()) {
                keyList.add(matcher.group(1).trim());
                put(matcher.group(1).trim(), matcher.group(2).trim());
            }
        }
    }

    public Iterator iterator() {
        return keyList.iterator();
    }
}