org.eclipse.scada.vi.ui.draw2d.loader.StaticSymbolLoader.java Source code

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Here is the source code for org.eclipse.scada.vi.ui.draw2d.loader.StaticSymbolLoader.java

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/*******************************************************************************
 * Copyright (c) 2011, 2014 TH4 SYSTEMS GmbH and others.
 * 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:
 *     TH4 SYSTEMS GmbH - initial API and implementation
 *     Jens Reimann - additional work
 *     IBH SYSTEMS GmbH - improve implementation
 *******************************************************************************/
package org.eclipse.scada.vi.ui.draw2d.loader;

import java.net.URL;
import java.nio.charset.Charset;

import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.scada.vi.model.Symbol;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.io.Resources;

public class StaticSymbolLoader implements SymbolLoader {
    private final static Logger logger = LoggerFactory.getLogger(StaticSymbolLoader.class);

    private final Symbol symbol;

    public StaticSymbolLoader(final Symbol symbol) {
        this.symbol = symbol;
    }

    @Override
    public String getSourceName() {
        final Resource r = this.symbol.eResource();
        if (r != null && r.getURI() == null) {
            return r.getURI().toString();
        } else {
            return "<unknown>";
        }
    }

    @Override
    public Symbol loadSymbol() {
        return this.symbol;
    }

    @Override
    public String resolveUri(final String uri) {
        final Resource r = this.symbol.eResource();
        if (r == null) {
            return uri;
        }

        final URI u = r.getURI();
        if (u == null) {
            return uri;
        }

        logger.debug("Resolve - base: {}, uri: {}", u, uri);

        return URI.createURI(uri).resolve(u).toString();
    }

    @Override
    public String loadStringResource(final String url) throws Exception {
        final String target = resolveUri(url);
        logger.debug("Loading resource from: {}", target); //$NON-NLS-1$
        return Resources.toString(new URL(target), Charset.forName("UTF-8")); //$NON-NLS-1$
    }

}