runtimeconfigurable.java

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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.tools.ant;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Iterator;

import org.apache.tools.ant.util.CollectionUtils;
import org.xml.sax.AttributeList;
import org.xml.sax.helpers.AttributeListImpl;

/**
 * Wrapper class that holds the attributes of an element, its children, and
 * any text within it. It then takes care of configuring that element at
 * runtime.
 *
 */
public class RuntimeConfigurable implements Serializable {

    /** Empty Hashtable. */
    private static final Hashtable EMPTY_HASHTABLE = new Hashtable(0);

    /** Name of the element to configure. */
    private String elementTag = null;

    /** List of child element wrappers. */
    private List/*<RuntimeConfigurable>*/ children = null;

    /** The element to configure. It is only used during
     * maybeConfigure.
     */
    private transient Object wrappedObject = null;

    /** the creator used to make the wrapped object */
    private transient IntrospectionHelper.Creator creator;

    /**
     * XML attributes for the element.
     * @deprecated since 1.6.x
     */
    private transient AttributeList attributes;

    /** Attribute names and values. While the XML spec doesn't require
     *  preserving the order ( AFAIK ), some ant tests do rely on the
     *  exact order. The following code is copied from AttributeImpl.
     *  We could also just use SAX2 Attributes and convert to SAX1 ( DOM
     *  attribute Nodes can also be stored in SAX2 Attributes )
     *  XXX under JDK 1.4 you can just use a LinkedHashMap for this purpose -jglick
     * The only exception to this order is the treatment of
     * refid. A number of datatypes check if refid is set
     * when other attributes are set. This check will not
     * work if the build script has the other attribute before
     * the "refid" attribute, so now (ANT 1.7) the refid
     * attribute will be processed first.
     */
    private List/*<String>*/ attributeNames = null;

    /** Map of attribute names to values */
    private Map/*<String,String>*/ attributeMap = null;

    /** Text appearing within the element. */
    private StringBuffer characters = null;

    /** Indicates if the wrapped object has been configured */
    private boolean proxyConfigured = false;

    /** the polymorphic type */
    private String polyType = null;

    /** the "id" of this Element if it has one */
    private String id = null;

    /**
     * Sole constructor creating a wrapper for the specified object.
     *
     * @param proxy The element to configure. Must not be <code>null</code>.
     * @param elementTag The tag name generating this element.
     */
    public RuntimeConfigurable(Object proxy, String elementTag) {
        setProxy(proxy);
        setElementTag(elementTag);
        // Most likely an UnknownElement
        if (proxy instanceof Task) {
            ((Task) proxy).setRuntimeConfigurableWrapper(this);
        }
    }

    /**
     * Sets the element to configure.
     *
     * @param proxy The element to configure. Must not be <code>null</code>.
     */
    public synchronized void setProxy(Object proxy) {
        wrappedObject = proxy;
        proxyConfigured = false;
    }

    /**
     * Sets the creator of the element to be configured
     * used to store the element in the parent.
     *
     * @param creator the creator object.
     */
    synchronized void setCreator(IntrospectionHelper.Creator creator) {
        this.creator = creator;
    }

    /**
     * Get the object for which this RuntimeConfigurable holds the configuration
     * information.
     *
     * @return the object whose configure is held by this instance.
     */
    public synchronized Object getProxy() {
        return wrappedObject;
    }

    /**
     * Returns the id for this element.
     * @return the id.
     */
    public synchronized String getId() {
        return id;
    }

    /**
     * Get the polymorphic type for this element.
     * @return the ant component type name, null if not set.
     */
    public synchronized String getPolyType() {
        return polyType;
    }

    /**
     * Set the polymorphic type for this element.
     * @param polyType the ant component type name, null if not set.
     */
    public synchronized void setPolyType(String polyType) {
        this.polyType = polyType;
    }

    /**
     * Sets the attributes for the wrapped element.
     *
     * @deprecated since 1.6.x.
     * @param attributes List of attributes defined in the XML for this
     *                   element. May be <code>null</code>.
     */
    public synchronized void setAttributes(AttributeList attributes) {
        this.attributes = new AttributeListImpl(attributes);
        for (int i = 0; i < attributes.getLength(); i++) {
            setAttribute(attributes.getName(i), attributes.getValue(i));
        }
    }

    /**
     * Set an attribute to a given value.
     *
     * @param name the name of the attribute.
     * @param value the attribute's value.
     */
    public synchronized void setAttribute(String name, String value) {
        if (name.equalsIgnoreCase(ProjectHelper.ANT_TYPE)) {
            this.polyType = value;
        } else {
            if (attributeNames == null) {
                attributeNames = new ArrayList();
                attributeMap = new HashMap();
            }
            if (name.toLowerCase(Locale.US).equals("refid")) {
                attributeNames.add(0, name);
            } else {
                attributeNames.add(name);
            }
            attributeMap.put(name, value);
            if (name.equals("id")) {
                this.id = value;
            }
        }
    }

    /**
     * Delete an attribute.  Not for the faint of heart.
     * @param name the name of the attribute to be removed.
     */
    public synchronized void removeAttribute(String name) {
        attributeNames.remove(name);
        attributeMap.remove(name);
    }

    /**
     * Return the attribute map.
     *
     * @return Attribute name to attribute value map.
     * @since Ant 1.6
     */
    public synchronized Hashtable getAttributeMap() {
        return (attributeMap == null)
            ? EMPTY_HASHTABLE : new Hashtable(attributeMap);
    }

    /**
     * Returns the list of attributes for the wrapped element.
     *
     * @deprecated Deprecated since Ant 1.6 in favor of {@link #getAttributeMap}.
     * @return An AttributeList representing the attributes defined in the
     *         XML for this element. May be <code>null</code>.
     */
    public synchronized AttributeList getAttributes() {
        return attributes;
    }

    /**
     * Adds a child element to the wrapped element.