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 * 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

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package com.sun.tools.internal.xjc.model;

import java.util.ArrayList;

import java.util.Collection;

import com.sun.tools.internal.xjc.Plugin;

/**

 * Represents the list of {@link CPluginCustomization}s attached to a JAXB model component.

 *

 * <p>

 * When {@link Plugin}s register the customization namespace URIs through {@link Plugin#getCustomizationURIs()},

 * XJC will treat those URIs just like XJC's own extension "http://java.sun.com/xml/ns/xjc" and make them

 * available as DOM nodes through {@link CPluginCustomization}. A {@link Plugin} can then access

 * this information to change its behavior.

 *

 * @author Kohsuke Kawaguchi

 */

public final class CCustomizations extends ArrayList<CPluginCustomization> {

    /**

     * All {@link CCustomizations} used by a {@link Model} form a single linked list

     * so that we can look for unacknowledged customizations later.

     *

     * @see CPluginCustomization#markAsAcknowledged()

     * @see #setParent(Model,CCustomizable)

     */

    /*package*/ CCustomizations next;

    /**

     * The owner model component that carries these customizations.

     */

    private CCustomizable owner;

    public CCustomizations() {

    }

    public CCustomizations(Collection<? extends CPluginCustomization> cPluginCustomizations) {

        super(cPluginCustomizations);

    }

    /*package*/ void setParent(Model model,CCustomizable owner) {

        if(this.owner!=null)     return;

//        // loop check

//        for( CCustomizations c = model.customizations; c!=null; c=c.next )

//            assert c!=this;

        this.next = model.customizations;

        model.customizations = this;

        assert owner!=null;

        this.owner = owner;

    }

    /**

     * Gets the model component that carries this customization.

     *

     * @return never null.

     */

    public CCustomizable getOwner() {

        assert owner!=null;

        return owner;

    }

    /**

     * Finds the first {@link CPluginCustomization} that belongs to the given namespace URI.

     * @return null if not found

     */

    public CPluginCustomization find( String nsUri ) {

        for (CPluginCustomization p : this) {

            if(fixNull(p.element.getNamespaceURI()).equals(nsUri))

                return p;

        }

        return null;

    }

    /**

     * Finds the first {@link CPluginCustomization} that belongs to the given namespace URI and the local name.

     * @return null if not found

     */

    public CPluginCustomization find( String nsUri, String localName ) {

        for (CPluginCustomization p : this) {

            if(fixNull(p.element.getNamespaceURI()).equals(nsUri)

            && fixNull(p.element.getLocalName()).equals(localName))

                return p;

        }

        return null;

    }

    private String fixNull(String s) {

        if(s==null) return "";

        else        return s;

    }

    /**

     * Convenient singleton instance that represents an empty {@link CCustomizations}.

     */

    public static final CCustomizations EMPTY = new CCustomizations();

    /**

     * Merges two {@link CCustomizations} objects into one.

     */

    public static CCustomizations merge(CCustomizations lhs, CCustomizations rhs) {

        if(lhs==null || lhs.isEmpty())   return rhs;

        if(rhs==null || rhs.isEmpty())   return lhs;

        CCustomizations r = new CCustomizations(lhs);

        r.addAll(rhs);

        return r;

    }

    public boolean equals(Object o) {

        return this==o;

    }

    public int hashCode() {

        return System.identityHashCode(this);

    }

}