plugins/org.eclipse.viatra2.core2/src/org/eclipse/viatra2/buffers/GetBuffer.java

/*******************************************************************************
 * Copyright (c) 2004-2008 Andras Schmidt, Andras Balogh, Istvan Rath and Daniel Varro
 * 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:
 *    Andras Schmidt, Andras Balogh, Istvan Rath - initial API and implementation
 *******************************************************************************/

package org.eclipse.viatra2.buffers;

import java.io.IOException;
import java.net.URISyntaxException;

import org.eclipse.viatra2.core.IModelSpace;
import org.eclipse.viatra2.errors.VPMRuntimeException;
import org.eclipse.viatra2.natives.ASMNativeFunction;
import org.eclipse.viatra2.natives.NativeFunctionParameter;
import org.eclipse.viatra2.natives.VIATRANativeFunction;

@VIATRANativeFunction(name = "getBuffer", 
		remark = "If the buffer does not exist yet, it will be created. Existing files will be appended to.", 
		returns = { NativeFunctionParameter.ParameterType.NATIVE }, 
		params = { 
		@NativeFunctionParameter(
				description = "Uniquely identifies an output buffer. Currently supported schemes are: core://<<id>>, file://<<workspace-relative path>>, os://<<absolute path>>.", 
				name = "bufferURI", type = { NativeFunctionParameter.ParameterType.STRING}
		),
		@NativeFunctionParameter(
				description = "OPTIONALLY indicates whether a file:// or os:// buffer should be created by truncating the original file or append to",
				name = "append", type = {NativeFunctionParameter.ParameterType.BOOLEAN}
		)
		}
)
public class GetBuffer implements ASMNativeFunction {

	public Object evaluate(IModelSpace msp, Object[] params)
			throws VPMRuntimeException {
		try {
			if (params.length>1 && params[1] instanceof Boolean)
			{
				return BufferStore.getBuffer(msp, params[0].toString(), (Boolean)params[1]);
			}
			else if (params.length==1) {
				return BufferStore.getBuffer(msp, params[0].toString());
			}
		} catch (URISyntaxException e) {
			throw new VPMRuntimeException("Invalid URI syntax", e);
		} catch (IOException e) {
			throw new VPMRuntimeException("I/O error", e);
		}
		return null;
	}

	public String getDescription() {
		return "Creates/retrieves a new output buffer";
	}

	public String getID() {
		return this.getClass().getCanonicalName();
	}

	public String getName() {
		return "getBuffer"; // VTCL
	}

}