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Groovy example source code file (BaseMarkupBuilder.java)

This example Groovy source code file (BaseMarkupBuilder.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 - Groovy tags/keywords

basemarkupbuilder, closure, closure, document, groovyinterceptable, groovyobjectsupport, hashmap, map, map, object, object, outputsink, string, string, util

The Groovy BaseMarkupBuilder.java source code

/*
 * 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.streamingmarkupsupport;

import groovy.lang.Closure;
import groovy.lang.GroovyInterceptable;
import groovy.lang.GroovyObjectSupport;

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

public class BaseMarkupBuilder extends Builder {
    public BaseMarkupBuilder(final Map namespaceMethodMap) {
        super(namespaceMethodMap);
    }

    public Object bind(final Closure root) {
        return new Document(root, this.namespaceMethodMap);
    }

    private static class Document extends Built implements GroovyInterceptable {
        private Object out;
        private final Map pendingNamespaces = new HashMap();
        private final Map namespaces = new HashMap();
        private final Map specialProperties = new HashMap();
        private String prefix = "";

        {

            namespaces.put("xml", "http://www.w3.org/XML/1998/namespace");             // built in namespace
            namespaces.put("mkp", "http://www.codehaus.org/Groovy/markup/keywords");   // pseudo namespace for markup keywords

            specialProperties.put("out", new OutputSink("out") {
                public Object leftShift(final Object value) {
                    return leftShift("yield", value);
                }
            });
            specialProperties.put("unescaped", new OutputSink("unescaped") {
                public Object leftShift(final Object value) {
                    return leftShift("yieldUnescaped", value);
                }
            });
            specialProperties.put("namespaces", new OutputSink("namespaces") {
                public Object leftShift(final Object value) {
                    return leftShift("declareNamespace", value);
                }
            });
            specialProperties.put("pi", new OutputSink("pi") {
                public Object leftShift(final Object value) {
                    return leftShift("pi", value);
                }
            });
            specialProperties.put("comment", new OutputSink("comment") {
                public Object leftShift(final Object value) {
                    return leftShift("comment", value);
                }
            });
        }

        private abstract class OutputSink extends GroovyObjectSupport {
            private final String name;

            public OutputSink(final String name) {
                this.name = name;
            }

            public Object invokeMethod(final String name, final Object args) {
                Document.this.prefix = this.name;
                return Document.this.invokeMethod(name, args);
            }

            public abstract Object leftShift(Object item);

            protected Object leftShift(final String command, final Object value) {
                Document.this.getProperty("mkp");
                Document.this.invokeMethod(command, new Object[]{value});
                return this;
            }
        }

        public Document(final Closure root, final Map namespaceMethodMap) {
            super(root, namespaceMethodMap);
        }

        /* (non-Javadoc)
           * @see groovy.lang.GroovyObject#invokeMethod(java.lang.String, java.lang.Object)
           */
        public Object invokeMethod(final String name, final Object args) {
            final Object[] arguments = (Object[]) args;
            Map attrs = Collections.EMPTY_MAP;
            Object body = null;

            //
            // Sort the parameters out
            //
            for (int i = 0; i != arguments.length; i++) {
                final Object arg = arguments[i];

                if (arg instanceof Map) {
                    attrs = (Map) arg;
                } else if (arg instanceof Closure) {
                    final Closure c = ((Closure) arg);

                    c.setDelegate(this);
                    body = c.asWritable();
                } else {
                    body = arg;
                }
            }

            //
            // call the closure corresponding to the tag
            //
            final Object uri;

            if (this.pendingNamespaces.containsKey(this.prefix)) {
                uri = this.pendingNamespaces.get(this.prefix);
            } else if (this.namespaces.containsKey(this.prefix)) {
                uri = this.namespaces.get(this.prefix);
            } else {
                uri = ":";
            }

            final Object[] info = (Object[]) this.namespaceSpecificTags.get(uri);
            final Map tagMap = (Map) info[2];
            final Closure defaultTagClosure = (Closure) info[0];

            final String prefix = this.prefix;
            this.prefix = "";

            if (tagMap.containsKey(name)) {
                return ((Closure) tagMap.get(name)).call(new Object[]{this, this.pendingNamespaces, this.namespaces, this.namespaceSpecificTags, prefix, attrs, body, this.out});
            } else {
                return defaultTagClosure.call(new Object[]{name, this, this.pendingNamespaces, this.namespaces, this.namespaceSpecificTags, prefix, attrs, body, this.out});
            }
        }

        /* (non-Javadoc)
         * @see groovy.lang.GroovyObject#getProperty(java.lang.String)
         */
        public Object getProperty(final String property) {
            final Object special = this.specialProperties.get(property);

            if (special == null) {
                this.prefix = property;
                return this;
            } else {
                return special;
            }
        }

        /* (non-Javadoc)
         * @see groovy.lang.GroovyObject#setProperty(java.lang.String, java.lang.Object)
         */
        public void setProperty(String property, Object newValue) {
            if ("trigger".equals(property)) {
                this.out = newValue;
                this.root.call(this);
            } else {
                super.setProperty(property, newValue);
            }
        }
    }
}

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