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Java example source code file (FeaturePropertyBase.java)

This example Java source code file (FeaturePropertyBase.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

apiproperty, default, enum, featurepropertybase, fsp, jaxpdotproperties, numberformatexception, object, state, string, systemproperty

The FeaturePropertyBase.java Java example source code

/*
 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.org.apache.xalan.internal.utils;

import com.sun.org.apache.xalan.internal.XalanConstants;

/**
 * This is the base class for features and properties
 *
 */
public abstract class FeaturePropertyBase {

    /**
     * States of the settings of a property, in the order: default value, value
     * set by FEATURE_SECURE_PROCESSING, jaxp.properties file, jaxp system
     * properties, and jaxp api properties
     */
    public static enum State {
        //this order reflects the overriding order
        DEFAULT, FSP, JAXPDOTPROPERTIES, SYSTEMPROPERTY, APIPROPERTY
    }


    /**
     * Values of the properties as defined in enum Properties
     */
    String[] values = null;
    /**
     * States of the settings for each property in Properties above
     */
    State[] states = {State.DEFAULT, State.DEFAULT};


    /**
     * Set the value for a specific property.
     *
     * @param property the property
     * @param state the state of the property
     * @param value the value of the property
     */
    public void setValue(Enum property, State state, String value) {
        //only update if it shall override
        if (state.compareTo(states[property.ordinal()]) >= 0) {
            values[property.ordinal()] = value;
            states[property.ordinal()] = state;
        }
    }

    /**
     * Set the value of a property by its index
     * @param index the index of the property
     * @param state the state of the property
     * @param value the value of the property
     */
    public void setValue(int index, State state, String value) {
        //only update if it shall override
        if (state.compareTo(states[index]) >= 0) {
            values[index] = value;
            states[index] = state;
        }
    }

     /**
     * Set value by property name and state
     * @param propertyName property name
     * @param state the state of the property
     * @param value the value of the property
     * @return true if the property is managed by the security property manager;
     *         false if otherwise.
     */
    public boolean setValue(String propertyName, State state, Object value) {
        int index = getIndex(propertyName);
        if (index > -1) {
            setValue(index, state, (String)value);
            return true;
        }
        return false;
    }

     /**
     * Set value by property name and state
     * @param propertyName property name
     * @param state the state of the property
     * @param value the value of the property
     * @return true if the property is managed by the security property manager;
     *         false if otherwise.
     */
    public boolean setValue(String propertyName, State state, boolean value) {
        int index = getIndex(propertyName);
        if (index > -1) {
            if (value) {
                setValue(index, state, XalanConstants.FEATURE_TRUE);
            } else {
                setValue(index, state, XalanConstants.FEATURE_FALSE);
            }
            return true;
        }
        return false;
    }

    /**
     * Return the value of the specified property
     *
     * @param property the property
     * @return the value of the property
     */
    public String getValue(Enum property) {
        return values[property.ordinal()];
    }

    /**
     * Return the value of the specified property
     *
     * @param property the property
     * @return the value of the property
     */
    public String getValue(String property) {
        int index = getIndex(property);
        if (index > -1) {
            return getValueByIndex(index);
        }
        return null;
    }

    /**
     * Return the value of the specified property.
     *
     * @param propertyName the property name
     * @return the value of the property as a string. If a property is managed
     * by this manager, its value shall not be null.
     */
    public String getValueAsString(String propertyName) {
        int index = getIndex(propertyName);
        if (index > -1) {
            return getValueByIndex(index);
        }

        return null;
    }

    /**
     * Return the value of a property by its ordinal
     * @param index the index of a property
     * @return value of a property
     */
    public String getValueByIndex(int index) {
        return values[index];
    }

    /**
     * Get the index by property name
     * @param propertyName property name
     * @return the index of the property if found; return -1 if not
     */
    public abstract int getIndex(String propertyName);

    public <E extends Enum int getIndex(Class property, String propertyName) {
        for (Enum<E> enumItem : property.getEnumConstants()) {
            if (enumItem.toString().equals(propertyName)) {
                //internally, ordinal is used as index
                return enumItem.ordinal();
            }
        }
        return -1;
    };


    /**
     * Read from system properties, or those in jaxp.properties
     *
     * @param property the property
     * @param systemProperty the name of the system property
     */
    void getSystemProperty(Enum property, String systemProperty) {
        try {
            String value = SecuritySupport.getSystemProperty(systemProperty);
            if (value != null) {
                values[property.ordinal()] = value;
                states[property.ordinal()] = State.SYSTEMPROPERTY;
                return;
            }

            value = SecuritySupport.readJAXPProperty(systemProperty);
            if (value != null) {
                values[property.ordinal()] = value;
                states[property.ordinal()] = State.JAXPDOTPROPERTIES;
            }
        } catch (NumberFormatException e) {
            //invalid setting ignored
        }
    }
}

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