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/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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 org.apache.ivy.core.cache;

import java.io.File;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.ivy.core.RelativeUrlResolver;
import org.apache.ivy.core.module.id.ModuleId;
import org.apache.ivy.core.module.id.ModuleRevisionId;
import org.apache.ivy.core.module.status.StatusManager;
import org.apache.ivy.plugins.conflict.ConflictManager;
import org.apache.ivy.plugins.matcher.PatternMatcher;
import org.apache.ivy.plugins.namespace.Namespace;
import org.apache.ivy.plugins.parser.ParserSettings;
import org.apache.ivy.plugins.resolver.DependencyResolver;
import org.apache.ivy.util.Message;

/**
 * Keep traces of the usage of a ParserSettings in order to check afterwards that the relevant
 * settings didn't changed.
 * 

* A ParserSettingsMonitor provide a ParserSettings that must be used in place of the orignal one. *

*

* The current implementation consider that a settings changed iff one of the used variable has * changed. *

*/ class ParserSettingsMonitor { private ParserSettings delegatedSettings; private final Map/* */substitutes; public ParserSettingsMonitor(ParserSettings settings) { this.delegatedSettings = settings; this.substitutes = new HashMap(); } /** * @return The parser settings that must be used in place of the orignal settings The returned * object delegates all the call to the original settings. */ public ParserSettings getMonitoredSettings() { return monitoredSettings; } /** * Free the ressource used during the monitoring, keeping only the info required to evaluate * hasChanged. */ public void endMonitoring() { monitoredSettings = null; delegatedSettings = null; } /** * Check if the newSettings is compatible with the original settings that has been monitored. * Only the info that was actually used is compared. */ public boolean hasChanged(ParserSettings newSettings) { for (Iterator it = substitutes.entrySet().iterator(); it.hasNext();) { Map.Entry entry = (Entry) it.next(); String key = (String) entry.getKey(); Object oldValue = entry.getValue(); String newValue = newSettings.substitute(key); if (!oldValue.equals(newValue)) { Message.debug("settings variable has changed for : " + entry.getKey()); return true; } } return false; } private ParserSettings monitoredSettings = new ParserSettings() { public ConflictManager getConflictManager(String name) { return delegatedSettings.getConflictManager(name); } public PatternMatcher getMatcher(String matcherName) { return delegatedSettings.getMatcher(matcherName); } public Namespace getNamespace(String namespace) { return delegatedSettings.getNamespace(namespace); } public RelativeUrlResolver getRelativeUrlResolver() { return delegatedSettings.getRelativeUrlResolver(); } public ResolutionCacheManager getResolutionCacheManager() { return delegatedSettings.getResolutionCacheManager(); } public DependencyResolver getResolver(ModuleRevisionId mRevId) { return delegatedSettings.getResolver(mRevId); } public StatusManager getStatusManager() { return delegatedSettings.getStatusManager(); } public File resolveFile(String filename) { return delegatedSettings.resolveFile(filename); } public String getDefaultBranch(ModuleId moduleId) { return delegatedSettings.getDefaultBranch(moduleId); } public Namespace getContextNamespace() { return delegatedSettings.getContextNamespace(); } public Map substitute(Map strings) { Map substituted = new LinkedHashMap(); for (Iterator it = strings.entrySet().iterator(); it.hasNext();) { Map.Entry entry = (Map.Entry) it.next(); substituted.put(entry.getKey(), substitute((String) entry.getValue())); } return substituted; } public String substitute(String value) { String r = delegatedSettings.substitute(value); if (value != null && value != r) { substitutes.put(value, r); } return r; } }; }




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