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Apache CXF example source code file (NamespacePrefixAccumulator.java)

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

Java - Apache CXF tags/keywords

hashmap, hashset, map, map, namespaceprefixaccumulator, namespaceprefixaccumulator, prefix, runtimeexception, schemacollection, set, string, string, stringbuilder, stringbuilder, util

The Apache CXF NamespacePrefixAccumulator.java source code

/**
 * 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.cxf.javascript;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import javax.xml.namespace.QName;

import org.apache.cxf.common.xmlschema.SchemaCollection;
import org.apache.ws.commons.schema.XmlSchemaAttribute;

public class NamespacePrefixAccumulator {
    private StringBuilder attributes;
    private Set<String> prefixes;
    private Map<String, String> fallbackNamespacePrefixMap;
    private int nsCounter;
    private SchemaCollection schemaCollection;

    public NamespacePrefixAccumulator(SchemaCollection schemaCollection) {
        attributes = new StringBuilder();
        prefixes = new HashSet<String>();
        fallbackNamespacePrefixMap = new HashMap<String, String>();
        nsCounter = 0;
        this.schemaCollection = schemaCollection;
    }
    
    public void collect(String prefix, String uri) {
        if (!("".equals(uri)) && !prefixes.contains(prefix)) {
            attributes.append("xmlns:" + prefix + "='" + uri + "' ");
            prefixes.add(prefix);
        }
    }
    
    public String getAttributes() {
        return attributes.toString();
    }
    
    private String getPrefix(String namespaceURI) {
        if ("".equals(namespaceURI)) {
            throw new RuntimeException("Prefix requested for default namespace.");
        }
        String schemaPrefix = schemaCollection.getNamespaceContext().getPrefix(namespaceURI);
        // there could also be a namespace context on an individual schema info.
        // perhaps SchemaCollection should be enforcing some discipline there.
        if (schemaPrefix == null || "tns".equals(schemaPrefix)) {
            schemaPrefix = fallbackNamespacePrefixMap.get(namespaceURI);
            if (schemaPrefix == null) {
                schemaPrefix = "jns" + nsCounter;
                nsCounter++;
                fallbackNamespacePrefixMap.put(namespaceURI, schemaPrefix);
            }
        }
        return schemaPrefix;
    }
    
    /**
     * This function obtains a name, perhaps namespace-qualified, for an element.
     * @param elementQName the element.
     * @param qualified whether to qualify.
     * @return
     */
    public String xmlElementString(QName elementQName, boolean qualified) {
        if (qualified) {
            // What if there were a prefix in the element's qname? This is not apparently 
            // something that happens in this environment.
            String prefix = getPrefix(elementQName.getNamespaceURI());
            collect(prefix, elementQName.getNamespaceURI());
            return prefix + ":" + elementQName.getLocalPart();
        }
        return elementQName.getLocalPart(); // use the non-qualified name.
    }
    
    /**
     * Obtain a suitable name for use in Javascript for an attribute. This function
     * is purely a tribute to the awful modularity of XmlSchema.
     * @param attribute
     * @param qualified
     * @return
     */
    public String xmlAttributeString(XmlSchemaAttribute attribute, boolean qualified) {
        if (qualified) {
            // What if there were a prefix in the element's qname? This is not apparently 
            // something that happens in this environment.
            String prefix = getPrefix(attribute.getQName().getNamespaceURI());
            collect(prefix, attribute.getQName().getNamespaceURI());
            return prefix + ":" + attribute.getName();
        }
        return attribute.getName(); // use the non-qualified name.
    }
    
    public String xmlElementString(QName name) { // used with part concrete names
        if ("".equals(name.getNamespaceURI())) {
            return name.getLocalPart();
        }

        String prefix = getPrefix(name.getNamespaceURI());
        collect(prefix, name.getNamespaceURI());
        return prefix + ":" + name.getLocalPart();
    }
}

Other Apache CXF examples (source code examples)

Here is a short list of links related to this Apache CXF NamespacePrefixAccumulator.java source code file:

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