org.codehaus.plexus.compiler.util.scan.StaleSourceScanner Maven / Gradle / Ivy

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package org.codehaus.plexus.compiler.util.scan;

/*
 * Copyright 2001-2005 The Apache Software Foundation.
 *
 * 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.
 */

import java.io.File;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.codehaus.plexus.compiler.util.scan.mapping.SourceMapping;

/**
 * @author jdcasey
 */
public class StaleSourceScanner extends AbstractSourceInclusionScanner {
    private final long lastUpdatedWithinMsecs;

    private final Set sourceIncludes;

    private final Set sourceExcludes;

    // ----------------------------------------------------------------------
    //
    // ----------------------------------------------------------------------

    public StaleSourceScanner() {
        this(0, Collections.singleton("**/*"), Collections.emptySet());
    }

    public StaleSourceScanner(long lastUpdatedWithinMsecs) {
        this(lastUpdatedWithinMsecs, Collections.singleton("**/*"), Collections.emptySet());
    }

    public StaleSourceScanner(long lastUpdatedWithinMsecs, Set sourceIncludes, Set sourceExcludes) {
        this.lastUpdatedWithinMsecs = lastUpdatedWithinMsecs;

        this.sourceIncludes = sourceIncludes;

        this.sourceExcludes = sourceExcludes;
    }

    // ----------------------------------------------------------------------
    // SourceInclusionScanner Implementation
    // ----------------------------------------------------------------------

    public Set getIncludedSources(File sourceDir, File targetDir) throws InclusionScanException {
        List srcMappings = getSourceMappings();

        if (srcMappings.isEmpty()) {
            return Collections.emptySet();
        }

        String[] potentialIncludes = scanForSources(sourceDir, sourceIncludes, sourceExcludes);

        Set matchingSources = new HashSet<>();

        for (String path : potentialIncludes) {
            File sourceFile = new File(sourceDir, path);

            staleSourceFileTesting:
            for (SourceMapping mapping : srcMappings) {
                Set targetFiles = mapping.getTargetFiles(targetDir, path);

                // never include files that don't have corresponding target mappings.
                // the targets don't have to exist on the filesystem, but the
                // mappers must tell us to look for them.
                for (File targetFile : targetFiles) {
                    if (!targetFile.exists()
                            || (targetFile.lastModified() + lastUpdatedWithinMsecs < sourceFile.lastModified())) {
                        matchingSources.add(sourceFile);
                        break staleSourceFileTesting;
                    }
                }
            }
        }

        return matchingSources;
    }
}