jsonxmlstreamwriter.java

来自「resetful样式的ws样例,一种面向资源的webservices服务」· Java 代码 · 共 442 行 · 第 1/2 页

/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://jersey.dev.java.net/CDDL+GPL.html
 * or jersey/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at jersey/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package com.sun.jersey.impl.json.writer;

import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.namespace.NamespaceContext;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;

/**
 *
 * @author japod
 */
public class JsonXmlStreamWriter implements XMLStreamWriter {


    private static class WriterAdapter {

        Writer writer;
        boolean isEmpty = true;

        WriterAdapter() {
        }

        WriterAdapter(Writer w) {
            writer = w;
        }

        void write(String s) throws IOException {
            assert null != writer;
            writer.write(s);
            isEmpty = false;
        }

        String getContent() {
            return null;
        }
        }

    private static final class StringWriterAdapter extends WriterAdapter {

        StringWriterAdapter() {
            writer = new StringWriter();
        }

        @Override
        String getContent() {
            return writer.toString();
        }
    }

    private static final class DummyWriterAdapter extends WriterAdapter {

        DummyWriterAdapter() {
        }

        @Override
        void write(String s) throws IOException {
        }

        @Override
        String getContent() {
            return null;
        }
    }

    private static final class ProcessingState {

        String lastName;
        String currentName;
        WriterAdapter lastElementWriter;
        Boolean lastWasPrimitive;
        boolean lastIsArray;
        boolean hasNoElements = true;
        boolean hasAttributes = false;
        WriterAdapter writer;

        ProcessingState() {
            writer = new StringWriterAdapter();
        }

        ProcessingState(WriterAdapter w) {
            writer = w;
        }

        @Override
        public String toString() {
            return "PS(" + currentName 
                    + "|" + ((writer != null) ? writer.getContent() : null) 
                    + "|" + lastName 
                    + "|" + ((lastElementWriter != null) ? lastElementWriter.getContent() : null) 
                    + ")";
        }
    }
    
    Writer mainWriter;
    boolean stripRoot;
    List<ProcessingState> processingStack;
    int depth;
    
    final Collection<String> arrayElementNames = new LinkedList<String>();
    final Collection<String> nonStringElementNames = new LinkedList<String>();

    public JsonXmlStreamWriter(Writer writer) {
        this(writer, false, null, null);
    }

    public JsonXmlStreamWriter(Writer writer, boolean stripRoot) {
        this(writer, stripRoot, null, null);
    }
    
    public JsonXmlStreamWriter(Writer writer, boolean stripRoot, Collection<String> arrays, Collection<String> nonStrings) {
        this.mainWriter = writer;
        this.stripRoot = stripRoot;
        if (null != arrays) {
            this.arrayElementNames.addAll(arrays);
        }
        if (null != nonStrings) {
            this.nonStringElementNames.addAll(nonStrings);
        }
    }

    public void close() throws XMLStreamException {
        throw new UnsupportedOperationException("Not supported yet.");
    }

    public void flush() throws XMLStreamException {
        try {
            mainWriter.flush();
        } catch (IOException ex) {
            Logger.getLogger(JsonXmlStreamWriter.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    public void writeEndDocument() throws XMLStreamException {
        try {
            if (null != processingStack.get(depth).lastElementWriter) {
                processingStack.get(depth).writer.write(processingStack.get(depth).lastElementWriter.getContent());
            }
            if ((null == processingStack.get(depth).lastWasPrimitive) || !processingStack.get(depth).lastWasPrimitive) {
                processingStack.get(depth).writer.write("}");
            }
            processingStack.remove(depth);
            depth--;
        } catch (IOException ex) {
            Logger.getLogger(JsonXmlStreamWriter.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    public void writeEndElement() throws XMLStreamException {
        try {
            if (null != processingStack.get(depth).lastElementWriter) {
                if (processingStack.get(depth).lastIsArray) {
                    processingStack.get(depth).writer.write(",");
                    processingStack.get(depth).writer.write(processingStack.get(depth).lastElementWriter.getContent());
                    processingStack.get(depth).writer.write("]");
                } else {
                    if (isArrayElement(processingStack.get(depth).lastName)) { // one elem array
                        processingStack.get(depth).writer.write("[");
                        processingStack.get(depth).lastIsArray = true;
                        processingStack.get(depth).writer.write(processingStack.get(depth).lastElementWriter.getContent());
                        processingStack.get(depth).writer.write("]");
                    } else {
                        processingStack.get(depth).writer.write(processingStack.get(depth).lastElementWriter.getContent());
                    }
                }
            }
            if (processingStack.get (depth).writer.isEmpty) {
                processingStack.get (depth).writer.write ("null");
            } else if ((null == processingStack.get(depth).lastWasPrimitive) || !processingStack.get(depth).lastWasPrimitive) {
                processingStack.get(depth).writer.write("}");
            }
            processingStack.get(depth - 1).lastName = processingStack.get(depth - 1).currentName;
            processingStack.get(depth - 1).lastWasPrimitive = false;
            processingStack.get(depth - 1).lastElementWriter = processingStack.get(depth).writer;
            processingStack.remove(depth);
            depth--;
        } catch (IOException ex) {
            Logger.getLogger(JsonXmlStreamWriter.class.getName()).log(Level.SEVERE, null, ex);