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/**
 * Copyright 2011-2018 Fraunhofer-Gesellschaft zur Förderung der angewandten Wissenschaften e.V.
 *
 * 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 org.ogema.resourcemanager.impl.model.simple;

import org.ogema.core.model.schedule.AbsoluteSchedule;
import org.ogema.core.model.simple.StringResource;
import org.ogema.core.resourcemanager.AccessMode;
import org.ogema.core.resourcemanager.ResourceAccessException;
import org.ogema.core.resourcemanager.VirtualResourceException;
import org.ogema.resourcemanager.impl.ApplicationResourceManager;
import org.ogema.resourcemanager.virtual.VirtualTreeElement;
import org.ogema.resourcetree.SimpleResourceData;

/**
 * 
 * @author jlapp
 */
public class DefaultStringResource extends SingleValueResourceBase implements StringResource {

	public DefaultStringResource(VirtualTreeElement el, String path, ApplicationResourceManager resMan) {
		super(el, path, resMan);
		if (el.getData().getString() == null)
			el.getData().setString("");
	}

	@Override
	public String getValue() {
		checkReadPermission();
		return getEl().getData().getString();
	}

	@Override
	public boolean setValue(String value) {
		resMan.lockRead();
		try {
			final VirtualTreeElement el = getElInternal();
			if (el.isVirtual() || getAccessModeInternal() == AccessMode.READ_ONLY) {
				return false;
			}
			checkWritePermission();
			final SimpleResourceData data = el.getData();
			boolean changed = !value.equals(data.getString());
			data.setString(value);
			handleResourceUpdateInternal(changed);
		} finally {
			resMan.unlockRead();
		}
		return true;
	}

	@Override
	public AbsoluteSchedule forecast() {
		return getSubResource("forecast", AbsoluteSchedule.class);
	}

	@Override
	public AbsoluteSchedule program() {
		return getSubResource("program", AbsoluteSchedule.class);
	}
	
	@Override
	public String getAndSet(final String value) throws VirtualResourceException, SecurityException, ResourceAccessException {
		if (!exists())
			throw new VirtualResourceException("Resource " + path + " is virtual, cannot set value");
		checkWriteAccess();
		resMan.lockWrite(); 
		try {
			final String val = getValue();
			setValue(value);
			return val;
		} finally {
			resMan.unlockWrite();
		}
	}

}