org.apache.maven.shared.io.scan.StaleResourceScanner Maven / Gradle / Ivy

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API for I/O support like logging, download or file scanning.
There is a newer version: 3.0.0
package org.apache.maven.shared.io.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 org.apache.maven.shared.io.scan.mapping.SourceMapping;

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

/**
 * @author jdcasey
 * @version $Id: StaleResourceScanner.java 357432 2005-12-18 04:53:37Z jdcasey $
 */
public class StaleResourceScanner
    extends AbstractResourceInclusionScanner
{
    private final long lastUpdatedWithinMsecs;

    private final Set sourceIncludes;

    private final Set sourceExcludes;

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

    public StaleResourceScanner()
    {
        this( 0, Collections.singleton( "**/*" ), Collections.EMPTY_SET );
    }

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

    public StaleResourceScanner( 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.EMPTY_SET;
        }

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

        Set matchingSources = new HashSet();

        for ( int i = 0; i < potentialIncludes.length; i++ )
        {
            String path = potentialIncludes[i];

            File sourceFile = new File( sourceDir, path );

            staleSourceFileTesting: for ( Iterator patternIt = srcMappings.iterator(); patternIt.hasNext(); )
            {
                SourceMapping mapping = (SourceMapping) patternIt.next();

                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 ( Iterator targetIt = targetFiles.iterator(); targetIt.hasNext(); )
                {
                    File targetFile = (File) targetIt.next();

                    if ( !targetFile.exists()
                        || ( targetFile.lastModified() + lastUpdatedWithinMsecs < sourceFile.lastModified() ) )
                    {
                        matchingSources.add( sourceFile );
                        break staleSourceFileTesting;
                    }
                }
            }
        }

        return matchingSources;
    }
}