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Java example source code file (Properties.java)

This example Java source code file (Properties.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

entity, iterable, iterator, list, override, properties, propertiesiterator, property, propertymatcher, propertyselector, regex, regexppropertymatcher, string, stringbuilder, stringpropertymatcher, util

The Properties.java Java example source code

/*
 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */
package com.sun.hotspot.igv.data;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


/**
 *
 * @author Thomas Wuerthinger
 */
public class Properties implements Serializable, Iterable<Property> {

    public static final long serialVersionUID = 1L;
    private String[] map = new String[4];

    public Properties() {
    }

    @Override
    public boolean equals(java.lang.Object o) {
        if (!(o instanceof Properties)) {
            return false;
        }

        Properties p = (Properties) o;

        for (Property prop : this) {
            String value = p.get(prop.getName());
            if (value == null || !value.equals(prop.getValue())) {
                return false;
            }
        }
        return true;
    }

    @Override
    public int hashCode() {
        int hash = 5;
        hash = 83 * hash + (this.map != null ? this.map.hashCode() : 0);
        return hash;
    }

    public Properties(String name, String value) {
        this();
        this.setProperty(name, value);
    }

    public Properties(String name, String value, String name1, String value1) {
        this(name, value);
        this.setProperty(name1, value1);
    }

    public Properties(String name, String value, String name1, String value1, String name2, String value2) {
        this(name, value, name1, value1);
        this.setProperty(name2, value2);
    }

    public Properties(Properties p) {
        map = new String[p.map.length];
        System.arraycopy(map, 0, p.map, 0, p.map.length);
    }

    public static class Entity implements Provider {

        private Properties properties;

        public Entity() {
            properties = new Properties();
        }

        public Entity(Properties.Entity object) {
            properties = new Properties(object.getProperties());
        }

        public Properties getProperties() {
            return properties;
        }
    }

    private String getProperty(String key) {
        for (int i = 0; i < map.length; i += 2)
            if (map[i] != null && map[i].equals(key)) {
                return map[i + 1];
            }
        return null;
    }

    public interface PropertyMatcher {

        String getName();

        boolean match(String value);
    }

    public static class InvertPropertyMatcher implements PropertyMatcher {

        private PropertyMatcher matcher;

        public InvertPropertyMatcher(PropertyMatcher matcher) {
            this.matcher = matcher;
        }

        public String getName() {
            return matcher.getName();
        }

        public boolean match(String p) {
            return !matcher.match(p);
        }
    }

    public static class StringPropertyMatcher implements PropertyMatcher {

        private String name;
        private String value;

        public StringPropertyMatcher(String name, String value) {
            this.name = name;
            this.value = value;
        }

        public String getName() {
            return name;
        }

        public boolean match(String p) {
            return p.equals(value);
        }
    }

    public static class RegexpPropertyMatcher implements PropertyMatcher {

        private String name;
        private Pattern valuePattern;

        public RegexpPropertyMatcher(String name, String value) {
            this.name = name;
            valuePattern = Pattern.compile(value);
        }

        public String getName() {
            return name;
        }

        public boolean match(String p) {
            Matcher m = valuePattern.matcher(p);
            return m.matches();
        }
    }

    public Property selectSingle(PropertyMatcher matcher) {
        String value = null;
        for (int i = 0; i < map.length; i += 2) {
            if (map[i] != null && matcher.getName().equals(map[i]))  {
                value = map[i + 1];
                break;
            }
        }
        if (value != null && matcher.match(value)) {
            return new Property(matcher.getName(), value);
        } else {
            return null;
        }
    }

    public interface Provider {

        public Properties getProperties();
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("[");
        for (int i = 0; i < map.length; i += 2) {
            if (map[i + 1] != null) {
                String p = map[i + 1];
                sb.append(map[i] + " = " + map[i + 1] + "; ");
            }
        }
        return sb.append("]").toString();
    }

    public static class PropertySelector<T extends Properties.Provider> {

        private Collection<T> objects;

        public PropertySelector(Collection<T> objects) {
            this.objects = objects;
        }

        public T selectSingle(final String name, final String value) {
            return selectSingle(new StringPropertyMatcher(name, value));
        }

        public T selectSingle(PropertyMatcher matcher) {

            for (T t : objects) {
                Property p = t.getProperties().selectSingle(matcher);
                if (p != null) {
                    return t;
                }
            }

            return null;
        }

        public List<T> selectMultiple(final String name, final String value) {
            return selectMultiple(new StringPropertyMatcher(name, value));
        }

        public List<T> selectMultiple(PropertyMatcher matcher) {
            List<T> result = new ArrayList();
            for (T t : objects) {
                Property p = t.getProperties().selectSingle(matcher);
                if (p != null) {
                    result.add(t);
                }
            }
            return result;
        }
    }

    public String get(String key) {
        for (int i = 0; i < map.length; i += 2) {
            if (map[i] != null && map[i].equals(key)) {
                return map[i + 1];
            }
        }
        return null;
    }

    public void setProperty(String name, String value) {
        for (int i = 0; i < map.length; i += 2) {
            if (map[i] != null && map[i].equals(name)) {
                String p = map[i + 1];
                if (value == null) {
                    // remove this property
                    map[i] = null;
                    map[i + 1] = null;
                } else {
                    map[i + 1] = value;
                }
                return;
            }
        }
        if (value == null) {
            return;
        }
        for (int i = 0; i < map.length; i += 2) {
            if (map[i] == null) {
                map[i] = name;
                map[i + 1] = value;
                return;
            }
        }
        String[] newMap = new String[map.length + 4];
        System.arraycopy(map, 0, newMap, 0, map.length);
        newMap[map.length] = name;
        newMap[map.length + 1] = value;
        map = newMap;
    }

    public  Iterator<Property> getProperties() {
        return iterator();
    }

    public void add(Properties properties) {
        for (Property p : properties) {
            add(p);
        }
    }

    public void add(Property property) {
        assert property.getName() != null;
        assert property.getValue() != null;
        setProperty(property.getName(), property.getValue());
    }
    class PropertiesIterator implements Iterator<Property>, Iterable {
        public Iterator<Property> iterator() {
                return this;
        }

        int index;

        public boolean hasNext() {
            while (index < map.length && map[index + 1] == null)
                index += 2;
            return index < map.length;
        }

        public Property next() {
            if (index < map.length) {
                index += 2;
                return new Property(map[index - 2], map[index - 1]);
            }
            return null;
        }

        public void remove() {
            throw new UnsupportedOperationException("Not supported yet.");
        }

    }
    public Iterator<Property> iterator() {
        return new PropertiesIterator();
    }
}

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