/*

 * Copyright (c) 1997, 2012, 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

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 */

package com.sun.xml.internal.xsom;

import org.relaxng.datatype.ValidationContext;

/**

 * String with in-scope namespace binding information.

 *

 * <p>

 * In a general case, text (PCDATA/attributes) that appear in XML schema

 * cannot be correctly interpreted unless you also have in-scope namespace

 * binding (a case in point is QName.) Therefore, it's convenient to

 * handle the lexical representation and the in-scope namespace binding

 * in a pair.

 *

 * @author Kohsuke Kawaguchi

 */

public final class XmlString {

    /**

     * Textual value. AKA lexical representation.

     */

    public final String value;

    /**

     * Used to resole in-scope namespace bindings.

     */

    public final ValidationContext context;

    /**

     * Creates a new {@link XmlString} from a lexical representation and in-scope namespaces.

     */

    public XmlString(String value, ValidationContext context) {

        this.value = value;

        this.context = context;

        if(context==null)

            throw new IllegalArgumentException();

    }

    /**

     * Creates a new {@link XmlString} with empty in-scope namespace bindings.

     */

    public XmlString(String value) {

        this(value,NULL_CONTEXT);

    }

    /**

     * Resolves a namespace prefix to the corresponding namespace URI.

     *

     * This method is used for resolving prefixes in the {@link #value}

     * (such as when {@link #value} represents a QName type.)

     *

     * <p>

     * If the prefix is "" (empty string), the method

     * returns the default namespace URI.

     *

     * <p>

     * If the prefix is "xml", then the method returns

     * "http://www.w3.org/XML/1998/namespace",

     * as defined in the XML Namespaces Recommendation.

     *

     * @return

     *          namespace URI of this prefix.

     *          If the specified prefix is not declared,

     *          the implementation returns null.

     */

    public final String resolvePrefix(String prefix) {

        return context.resolveNamespacePrefix(prefix);

    }

    public String toString() {

        return value;

    }

    private static final ValidationContext NULL_CONTEXT = new ValidationContext() {

        public String resolveNamespacePrefix(String s) {

            if(s.length()==0)   return "";

            if(s.equals("xml")) return "http://www.w3.org/XML/1998/namespace";

            return null;

        }

        public String getBaseUri() {

            return null;

        }

        public boolean isUnparsedEntity(String s) {

            return false;

        }

        public boolean isNotation(String s) {

            return false;

        }

    };

}