java.security.Provider Maven / Gradle / Ivy

/*
 *  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 java.security;

import java.io.IOException;
import java.io.InputStream;
import java.io.NotActiveException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import org.apache.harmony.security.fortress.Services;

/**
 * {@code Provider} is the abstract superclass for all security providers in the
 * Java security infrastructure.
 */
public abstract class Provider extends Properties {
    private static final long serialVersionUID = -4298000515446427739L;

    private String name;

    private double version;

    // String representation of the provider version number.
    private transient String versionString;

    private String info;

    //The provider preference order number.
    // Equals -1 for non registered provider.
    private transient int providerNumber = -1;

    // Contains "Service.Algorithm" and Provider.Service classes added using
    // putService()
    private transient LinkedHashMap serviceTable;

    // Contains "Service.Alias" and Provider.Service classes added using
    // putService()
    private transient LinkedHashMap aliasTable;

    // Contains "Service.Algorithm" and Provider.Service classes added using
    // put()
    private transient LinkedHashMap propertyServiceTable;

    // Contains "Service.Alias" and Provider.Service classes added using put()
    private transient LinkedHashMap propertyAliasTable;

    // The properties changed via put()
    private transient LinkedHashMap changedProperties;

    // For getService(String type, String algorithm) optimization:
    // previous result
    private transient Provider.Service returnedService;
    // previous parameters
    private transient String lastAlgorithm;
    // last name
    private transient String lastServiceName;

    // For getServices() optimization:
    private transient Set lastServicesSet;

    // For getService(String type) optimization:
    private transient String lastType;
    // last Service found by type
    private transient Provider.Service lastServicesByType;

    /**
     * Constructs a new instance of {@code Provider} with its name, version and
     * description.
     *
     * @param name
     *            the name of the provider.
     * @param version
     *            the version of the provider.
     * @param info
     *            a description of the provider.
     */
    protected Provider(String name, double version, String info) {
        this.name = name;
        this.version = version;
        this.info = info;
        versionString = String.valueOf(version);
        putProviderInfo();
    }

    /**
     * Returns the name of this provider.
     *
     * @return the name of this provider.
     */
    public String getName() {
        return name;
    }

    /**
     * Returns the version number for the services being provided.
     *
     * @return the version number for the services being provided.
     */
    public double getVersion() {
        return version;
    }

    /**
     * Returns a description of the services being provided.
     *
     * @return a description of the services being provided.
     */
    public String getInfo() {
        return info;
    }

    /**
     * Returns a string containing a concise, human-readable description of
     * this {@code Provider} including its name and its version.
     *
     * @return a printable representation for this {@code Provider}.
     */
    @Override
    public String toString() {
        return name + " version " + version;
    }

    /**
     * Clears all properties used to look up services implemented by this
     * {@code Provider}.
     */
    @Override
    public synchronized void clear() {
        super.clear();
        if (serviceTable != null) {
            serviceTable.clear();
        }
        if (propertyServiceTable != null) {
            propertyServiceTable.clear();
        }
        if (aliasTable != null) {
            aliasTable.clear();
        }
        if (propertyAliasTable != null) {
            propertyAliasTable.clear();
        }
        changedProperties = null;
        putProviderInfo();
        if (providerNumber != -1) {
            // if registered then refresh Services
            Services.setNeedRefresh();
        }
        servicesChanged();
    }

    @Override
    public synchronized void load(InputStream inStream) throws IOException {
        Properties tmp = new Properties();
        tmp.load(inStream);
        myPutAll(tmp);
    }

    /**
     * Copies all from the provided map to this {@code Provider}.
     * @param t
     *            the mappings to copy to this provider.
     */
    @Override
    public synchronized void putAll(Map t) {
        myPutAll(t);
    }

    private void myPutAll(Map t) {
        if (changedProperties == null) {
            changedProperties = new LinkedHashMap();
        }
        Iterator> it = t.entrySet().iterator();
        Object key;
        Object value;
        while (it.hasNext()) {
            Map.Entry entry = it.next();
            key = entry.getKey();
            if (key instanceof String && ((String) key).startsWith("Provider.")) {
                // Provider service type is reserved
                continue;
            }
            value = entry.getValue();
            super.put(key, value);
            if (changedProperties.remove(key) == null) {
                removeFromPropertyServiceTable(key);
            }
            changedProperties.put(key, value);
        }
        if (providerNumber != -1) {
            // if registered then refresh Services
            Services.setNeedRefresh();
        }
    }

    @Override
    public synchronized Set> entrySet() {
        return Collections.unmodifiableSet(super.entrySet());
    }

    @Override
    public Set