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Library providing immutable/persistent collection classes for Java. While collections are immutable they provide methods for adding and removing values by creating new modified copies of themselves. Each copy shares almost all of its structure with other copies to minimize memory consumption.

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//
// Burton Computer Corporation
// http://www.burton-computer.com
//
// Copyright (c) 2013, Burton Computer Corporation
// All rights reserved.
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package org.javimmutable.collections.common;

import org.javimmutable.collections.Cursor;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.cursors.TransformCursor;

import java.util.Map;

public abstract class AbstractJImmutableMap
        implements JImmutableMap
{
    @Override
    public Cursor keysCursor()
    {
        return TransformCursor.ofKeys(cursor());
    }

    @Override
    public Cursor valuesCursor()
    {
        return TransformCursor.ofValues(cursor());
    }

    @Override
    public int hashCode()
    {
        return getMap().hashCode();
    }

    @Override
    public boolean equals(Object o)
    {
        if (o == this) {
            return true;
        } else if (o instanceof JImmutableMap) {
            return getMap().equals(((JImmutableMap)o).getMap());
        } else {
            return (o instanceof Map) && getMap().equals(o);
        }
    }

    @Override
    public String toString()
    {
        StringBuilder sb = new StringBuilder();
        sb.append("[");
        for (Cursor> cursor = cursor().next(); cursor.hasValue(); cursor = cursor.next()) {
            if (sb.length() > 1) {
                sb.append(",");
            }
            JImmutableMap.Entry entry = cursor.getValue();
            sb.append("(");
            sb.append(entry.getKey());
            sb.append(" -> ");
            sb.append(entry.getValue());
            sb.append(")");
        }
        sb.append("]");
        return sb.toString();
    }
}