CropPictureConverter.java

/*
 * (C) Copyright 2006-2007 Nuxeo SA (http://nuxeo.com/) and others.
 *
 * 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.
 *
 * Contributors:
 *     Nuxeo - initial API and implementation
 *
 */
package org.nuxeo.ecm.platform.picture.convert;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.nuxeo.ecm.core.api.Blob;
import org.nuxeo.ecm.core.api.blobholder.BlobHolder;
import org.nuxeo.ecm.core.convert.api.ConversionException;
import org.nuxeo.ecm.core.convert.cache.SimpleCachableBlobHolder;
import org.nuxeo.ecm.core.convert.extension.Converter;
import org.nuxeo.ecm.core.convert.extension.ConverterDescriptor;
import org.nuxeo.ecm.platform.picture.api.ImagingConvertConstants;
import org.nuxeo.ecm.platform.picture.api.ImagingService;
import org.nuxeo.runtime.api.Framework;

/**
 * @author <a href="mailto:ldoguin@nuxeo.com">Laurent Doguin</a>
 */
public class CropPictureConverter implements Converter {

    private static final Log log = LogFactory.getLog(CropPictureConverter.class);

    @Override
    public BlobHolder convert(BlobHolder blobHolder, Map<String, Serializable> parameters) throws ConversionException {
        ImagingService service = Framework.getService(ImagingService.class);
        List<Blob> sources = blobHolder.getBlobs();
        List<Blob> results = new ArrayList<Blob>(sources.size());
        Serializable h = parameters.get(ImagingConvertConstants.OPTION_RESIZE_HEIGHT);
        int height = ConverterUtils.getInteger(h);
        Serializable w = parameters.get(ImagingConvertConstants.OPTION_RESIZE_WIDTH);
        int width = ConverterUtils.getInteger(w);
        Serializable xValue = parameters.get(ImagingConvertConstants.OPTION_CROP_X);
        int x = ConverterUtils.getInteger(xValue);
        Serializable yValue = parameters.get(ImagingConvertConstants.OPTION_CROP_Y);
        int y = ConverterUtils.getInteger(yValue);
        for (Blob source : sources) {
            if (source != null) {
                Blob result = service.crop(source, x, y, width, height);
                if (result != null) {
                    results.add(result);
                }
            }
        }
        return new SimpleCachableBlobHolder(results);
    }

    @Override
    public void init(ConverterDescriptor descriptor) {
    }

}