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JDK 1.6
  javax.tools. StandardLocation View Javadoc
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/*
 * @(#)StandardLocation.java	1.2 06/06/25
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.tools;

import javax.tools.JavaFileManager.Location;

import java.io.File;
import java.util.*;
import java.util.concurrent.*;

/**
 * Standard locations of file objects.
 *
 * @author Peter von der Ahé
 * @since 1.6
 */
public enum StandardLocation implements Location {

    /**
     * Location of new class files.
     */
    CLASS_OUTPUT,

    /**
     * Location of new source files.
     */
    SOURCE_OUTPUT,

    /**
     * Location to search for user class files.
     */
    CLASS_PATH,

    /**
     * Location to search for existing source files.
     */
    SOURCE_PATH,

    /**
     * Location to search for annotation processors.
     */
    ANNOTATION_PROCESSOR_PATH,

    /**
     * Location to search for platform classes.  Sometimes called
     * the boot class path.
     */
    PLATFORM_CLASS_PATH;

    /**
     * Gets a location object with the given name.  The following
     * property must hold: {@code locationFor(x) ==
     * locationFor(y)} if and only if {@code x.equals(y)}.
     * The returned location will be an output location if and only if
     * name ends with {@code "_OUTPUT"}.
     *
     * @param name a name
     * @return a location
     */
    public static Location locationFor(final String name) {
        if (locations.isEmpty()) {
            // can't use valueOf which throws IllegalArgumentException
            for (Location location : values())
                locations.putIfAbsent(location.getName(), location);
        }
        locations.putIfAbsent(name.toString(/* null-check */), new Location() {
                public String getName() { return name; }
                public boolean isOutputLocation() { return name.endsWith("_OUTPUT"); }
            });
        return locations.get(name);
    }
    //where
        private static ConcurrentMap<String,Location> locations
            = new ConcurrentHashMap<String,Location>();

    public String getName() { return name(); }

    public boolean isOutputLocation() {
        return this == CLASS_OUTPUT || this == SOURCE_OUTPUT;
    }
}

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