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Groovy: A powerful, dynamic language for the JVM
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/*
 * Copyright 2003-2007 the original author or authors.
 *
 * Licensed 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 groovy.xml;

import groovy.util.BuilderSupport;
import groovy.util.NodeBuilder;
import org.codehaus.groovy.runtime.InvokerHelper;

import java.util.HashMap;
import java.util.Map;

/**
 * A helper class for creating namespaced GroovyMarkup
 * 
 * @author James Strachan
 * @author Paul King
 * @author Denver Dino
 */
public class NamespaceBuilderSupport extends BuilderSupport {
    private boolean autoPrefix;
    private Map nsMap = new HashMap();
    private BuilderSupport builder;

    public NamespaceBuilderSupport(BuilderSupport builder) {
        super(builder);
        this.builder = builder;
    }

    public NamespaceBuilderSupport(BuilderSupport builder, String uri) {
        this(builder, uri, "");
    }

    public NamespaceBuilderSupport(BuilderSupport builder, String uri, String prefix) {
        this(builder, uri, prefix, true);
    }

    public NamespaceBuilderSupport(BuilderSupport builder, String uri, String prefix, boolean autoPrefix) {
        this(builder);
        nsMap.put(prefix, uri);
        this.autoPrefix = autoPrefix;
    }

    public NamespaceBuilderSupport(BuilderSupport builder, Map nsMap) {
        this(builder);
        this.nsMap = nsMap;
    }

    public NamespaceBuilderSupport namespace(String namespaceURI) {
        nsMap.put("", namespaceURI);
        return this;
    }

    public NamespaceBuilderSupport namespace(String namespaceURI, String prefix) {
        nsMap.put(prefix, namespaceURI);
        return this;
    }

    public NamespaceBuilderSupport declareNamespace(Map nsMap) {
        this.nsMap = nsMap;
        return this;
    }

    @Override
    protected Object getCurrent() {
        // TODO a better way to do this?
        if (builder instanceof NodeBuilder)
            return InvokerHelper.invokeMethod(builder, "getCurrent", null);
        else
            return super.getCurrent();
    }

    @Override
    protected void setCurrent(Object current) {
        // TODO a better way to do this?
        if (builder instanceof NodeBuilder)
            InvokerHelper.invokeMethod(builder, "setCurrent", current);
        else
            super.setCurrent(current);
    }

    @Override
    protected void setParent(Object parent, Object child) {
    }

    @Override
    protected Object getName(String methodName) {
        String prefix = autoPrefix ? nsMap.keySet().iterator().next() : "";
        String localPart = methodName;
        int idx = methodName.indexOf(':');
        if (idx > 0 ) {
            prefix = methodName.substring(0, idx);
            localPart = methodName.substring(idx + 1);
        }
        String namespaceURI = nsMap.get(prefix);
        if (namespaceURI == null) {
            namespaceURI = "";
            prefix = "";
        }
        return new QName(namespaceURI, localPart, prefix);
    }

    @Override
    protected Object createNode(Object name) {
        return name;
    }

    @Override
    protected Object createNode(Object name, Object value) {
        return name;
    }

    @Override
    protected Object createNode(Object name, Map attributes) {
        return name;
    }

    @Override
    protected Object createNode(Object name, Map attributes, Object value) {
        return name;
    }
}