com.textocat.textokit.commons.cpe.XmiFileListReader.java Source code

Introduction

Here is the source code for com.textocat.textokit.commons.cpe.XmiFileListReader.java

Source

/*
 *    Copyright 2015 Textocat
 *
 *    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 com.textocat.textokit.commons.cpe;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.uima.UimaContext;
import org.apache.uima.fit.descriptor.ConfigurationParameter;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;

import java.io.File;
import java.io.IOException;
import java.util.List;

/**
 * @author Rinat Gareev
 */
public class XmiFileListReader extends XmiCollectionReaderBase {

    public static final String PARAM_LIST_FILE = "listFile";
    public static final String PARAM_BASE_DIR = "baseDir";
    private static final Predicate<String> notBlankString = new Predicate<String>() {
        @Override
        public boolean apply(String arg) {
            return !StringUtils.isBlank(arg);
        }
    };
    @ConfigurationParameter(name = PARAM_BASE_DIR, mandatory = true)
    private String baseDirPath;
    @ConfigurationParameter(name = PARAM_LIST_FILE, mandatory = true)
    private File listFile;
    // derived
    private Resource baseDir;
    private final Function<String, Resource> relativeFileResourceFunc = new Function<String, Resource>() {
        @Override
        public Resource apply(String relPath) {
            try {
                return baseDir.createRelative(relPath);
            } catch (IOException e) {
                // should never happen
                throw new IllegalStateException(e);
            }
        }
    };
    private List<Resource> resources;

    @Override
    protected Iterable<Resource> getResources(UimaContext ctx) throws IOException {
        String baseDirPath = this.baseDirPath;
        baseDirPath = FilenameUtils.normalize(baseDirPath);
        // ensure that baseDirPath ends with slash for proper relative path handling
        if (!baseDirPath.endsWith(File.separator)) {
            baseDirPath += File.separator;
        }
        baseDir = new FileSystemResource(baseDirPath);
        if (!baseDir.exists()) {
            throw new IllegalStateException(String.format("Directory %s does not exist", baseDir));
        }
        List<String> lines = FileUtils.readLines(listFile, "utf-8");
        resources = Lists.transform(Lists.newArrayList(Iterables.filter(lines, notBlankString)),
                relativeFileResourceFunc);
        return resources;
    }

    @Override
    protected Integer getResourcesNumber() {
        return resources.size();
    }
}