/*
 * Copyright (C) 2005, 2007 db4objects Inc.  http://www.db4o.com
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     db4objects - Initial API and implementation
 *     Matt Carter - Improved primitive conversion support (bug 197679)
 */
package org.eclipse.core.internal.databinding.conversion;

import org.eclipse.core.databinding.conversion.IConverter;

/**
 * StringToCharacterConverter.
 */
public class StringToCharacterConverter implements IConverter {

    private final boolean primitiveTarget;

    /**
     * 
     * @param primitiveTarget
     */
    public StringToCharacterConverter(boolean primitiveTarget) {
        this.primitiveTarget = primitiveTarget;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.jface.binding.converter.IConverter#convert(java.lang.Object)
     */
    public Object convert(Object source) {
        if (source != null && !(source instanceof String))
            throw new IllegalArgumentException(
                    "String2Character: Expected type String, got type [" + source.getClass().getName() + "]"); //$NON-NLS-1$ //$NON-NLS-2$

        String s = (String) source;
        if (source == null || s.equals("")) { //$NON-NLS-1$
            if (primitiveTarget)
                throw new IllegalArgumentException(
                        "String2Character: cannot convert null/empty string to character primitive"); //$NON-NLS-1$
            return null;
        }
        Character result;

        if (s.length() > 1)
            throw new IllegalArgumentException(
                    "String2Character: string too long: " + s); //$NON-NLS-1$

        try {
            result = new Character(s.charAt(0));
        } catch (Exception e) {
            throw new IllegalArgumentException(
                    "String2Character: " + e.getMessage() + ": " + s); //$NON-NLS-1$ //$NON-NLS-2$
        }

        return result;
    }

    public Object getFromType() {
        return String.class;
    }

    public Object getToType() {
        return primitiveTarget ? Character.TYPE : Character.class;
    }

    /**
     * @param primitive
     * @return converter
     */
    public static StringToCharacterConverter toCharacter(boolean primitive) {
        return new StringToCharacterConverter(primitive);
    }

}