AbstractSaxableStorage.java

/*****************************************************************************
 * Copyright (c) 2006-2013, Cloudsmith Inc.
 * The code, documentation and other materials contained herein have been
 * licensed under the Eclipse Public License - v 1.0 by the copyright holder
 * listed above, as the Initial Contributor under such license. The text of
 * such license is available at www.eclipse.org.
 *****************************************************************************/
package org.eclipse.buckminster.core.metadata;

import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Locale;
import java.util.UUID;

import org.eclipse.buckminster.core.Messages;
import org.eclipse.buckminster.runtime.BuckminsterException;
import org.eclipse.buckminster.sax.UUIDKeyed;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.osgi.util.NLS;

/**
 * @author Thomas Hallgren
 */
abstract class AbstractSaxableStorage<T extends UUIDKeyed> implements ISaxableStorage<T> {
	private final Class<T> clazz;

	private HashMap<String, Method> getters;

	AbstractSaxableStorage(Class<T> clazz) {
		this.clazz = clazz;
	}

	@SuppressWarnings("unchecked")
	T[] createArray(int length) {
		return (T[]) Array.newInstance(clazz, length);
	}

	Class<T> getElementClass() {
		return clazz;
	}

	synchronized Method getGetter(String keyName) throws CoreException {
		String key = keyName.toLowerCase(Locale.ENGLISH);
		if (getters == null)
			getters = new HashMap<String, Method>();
		else {
			Method getter = getters.get(key);
			if (getter != null)
				return getter;
		}

		Class<UUID> retType = UUID.class;
		for (Method method : clazz.getMethods()) {
			// The method has to be a non static, public method that
			// returns an UUID and takes no arguments.
			//
			int mod = method.getModifiers();
			if (Modifier.isPublic(mod) && !Modifier.isStatic(mod) && method.getReturnType().equals(retType) && method.getParameterTypes().length == 0) {
				String name = method.getName().toLowerCase(Locale.ENGLISH);
				if (name.length() > 3 && name.startsWith("get")) //$NON-NLS-1$
				{
					name = name.substring(3);
					if (name.equals(key)) {
						getters.put(key, method);
						return method;
					}
				}
			}
		}
		throw BuckminsterException.fromMessage(NLS.bind(Messages.No_such_foreign_key_0, keyName));
	}
}