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Diffstat (limited to 'israfil-foundation-container/src/main/java/net/israfil/foundation/container/util/CyclicalReferenceDetectionUtil.java')
| -rw-r--r-- | israfil-foundation-container/src/main/java/net/israfil/foundation/container/util/CyclicalReferenceDetectionUtil.java | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/israfil-foundation-container/src/main/java/net/israfil/foundation/container/util/CyclicalReferenceDetectionUtil.java b/israfil-foundation-container/src/main/java/net/israfil/foundation/container/util/CyclicalReferenceDetectionUtil.java new file mode 100644 index 0000000..eb9f25c --- /dev/null +++ b/israfil-foundation-container/src/main/java/net/israfil/foundation/container/util/CyclicalReferenceDetectionUtil.java @@ -0,0 +1,62 @@ +/* + * Copyright (c) 2008 Israfil Consulting Services Corporation + * Copyright (c) 2008 Christian Edward Gruber + * All Rights Reserved + * + * This software is licensed under the Berkeley Standard Distribution license, + * (BSD license), as defined below: + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * 3. Neither the name of Israfil Consulting Services nor the names of its contributors + * may be used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, + * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY + * OF SUCH DAMAGE. + * + * $Id: Copyright.java 618 2008-04-14 14:03:03Z christianedwardgruber $ + */ +package net.israfil.foundation.container.util; + +import java.util.Map; + +import net.israfil.foundation.container.AutoWiringAdapter; +import net.israfil.foundation.container.error.CyclicalDependencyError; + +/** + * A utility class that provides convenience methods for circular + * reference detection. + * + * @author <a href="mailto:cgruber@israfil.net">Christian Edward Gruber </a> + */ +public class CyclicalReferenceDetectionUtil { + public static void detectCircularDependencies(Map registry, NonDuplicateStack nds, AutoWiringAdapter componentAdapter) { + Object[] deps = componentAdapter.dependencies(); + for (int i = 0; i < deps.length; i++) { + if (registry.containsKey(deps[i])) { + try { + nds.push(deps[i]); + } catch (IllegalArgumentException e) { + throw new CyclicalDependencyError("Item " + deps[i] + " is involved in a cyclic dependency. The full path is: " + nds); + } + detectCircularDependencies(registry, nds, (AutoWiringAdapter)registry.get(deps[i])); + nds.pop(); + } + } + } +} |