Android XmlPullParser Read readValueXml(XmlPullParser parser, String[] name)

Description

Read a flattened object from an XmlPullParser.

License

Apache License

Parameter

Parameter	Description
parser	The XmlPullParser from which to read the object.
name	An array of one string, used to return the name attribute of the value's tag.

Return

Object The newly generated value object.

Declaration

public static final Object readValueXml(XmlPullParser parser,
        String[] name) throws XmlPullParserException,
        java.io.IOException 

Method Source Code

//package com.java2s;
/*/* w  w  w .j  av a2  s  .c  o  m*/
 * Copyright (C) 2006 The Android Open Source Project
 *
 * 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.
 */

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import java.util.ArrayList;
import java.util.HashMap;

public class Main {
    /**
     * Read a flattened object from an XmlPullParser.  The XML data could
     * previously have been written with writeMapXml(), writeListXml(), or
     * writeValueXml().  The XmlPullParser must be positioned <em>at</em> the
     * tag that defines the value.
     * 
     * @param parser The XmlPullParser from which to read the object.
     * @param name An array of one string, used to return the name attribute
     *             of the value's tag.
     * 
     * @return Object The newly generated value object.
     * 
     * @see #readMapXml
     * @see #readListXml
     * @see #writeValueXml
     */
    public static final Object readValueXml(XmlPullParser parser,
            String[] name) throws XmlPullParserException,
            java.io.IOException {
        int eventType = parser.getEventType();
        do {
            if (eventType == XmlPullParser.START_TAG) {
                return readThisValueXml(parser, name);
            } else if (eventType == XmlPullParser.END_TAG) {
                throw new XmlPullParserException("Unexpected end tag at: "
                        + parser.getName());
            } else if (eventType == XmlPullParser.TEXT) {
                throw new XmlPullParserException("Unexpected text: "
                        + parser.getText());
            }
            eventType = parser.next();
        } while (eventType != XmlPullParser.END_DOCUMENT);

        throw new XmlPullParserException("Unexpected end of document");
    }

    private static final Object readThisValueXml(XmlPullParser parser,
            String[] name) throws XmlPullParserException,
            java.io.IOException {
        final String valueName = parser.getAttributeValue(null, "name");
        final String tagName = parser.getName();

        //System.out.println("Reading this value tag: " + tagName + ", name=" + valueName);

        Object res;

        if (tagName.equals("null")) {
            res = null;
        } else if (tagName.equals("string")) {
            String value = "";
            int eventType;
            while ((eventType = parser.next()) != XmlPullParser.END_DOCUMENT) {
                if (eventType == XmlPullParser.END_TAG) {
                    if (parser.getName().equals("string")) {
                        name[0] = valueName;
                        //System.out.println("Returning value for " + valueName + ": " + value);
                        return value;
                    }
                    throw new XmlPullParserException(
                            "Unexpected end tag in <string>: "
                                    + parser.getName());
                } else if (eventType == XmlPullParser.TEXT) {
                    value += parser.getText();
                } else if (eventType == XmlPullParser.START_TAG) {
                    throw new XmlPullParserException(
                            "Unexpected start tag in <string>: "
                                    + parser.getName());
                }
            }
            throw new XmlPullParserException(
                    "Unexpected end of document in <string>");
        } else if (tagName.equals("int")) {
            res = Integer.parseInt(parser.getAttributeValue(null, "value"));
        } else if (tagName.equals("long")) {
            res = Long.valueOf(parser.getAttributeValue(null, "value"));
        } else if (tagName.equals("float")) {
            res = new Float(parser.getAttributeValue(null, "value"));
        } else if (tagName.equals("double")) {
            res = new Double(parser.getAttributeValue(null, "value"));
        } else if (tagName.equals("boolean")) {
            res = Boolean.valueOf(parser.getAttributeValue(null, "value"));
        } else if (tagName.equals("int-array")) {
            parser.next();
            res = readThisIntArrayXml(parser, "int-array", name);
            name[0] = valueName;
            //System.out.println("Returning value for " + valueName + ": " + res);
            return res;
        } else if (tagName.equals("map")) {
            parser.next();
            res = readThisMapXml(parser, "map", name);
            name[0] = valueName;
            //System.out.println("Returning value for " + valueName + ": " + res);
            return res;
        } else if (tagName.equals("list")) {
            parser.next();
            res = readThisListXml(parser, "list", name);
            name[0] = valueName;
            //System.out.println("Returning value for " + valueName + ": " + res);
            return res;
        } else {
            throw new XmlPullParserException("Unknown tag: " + tagName);
        }

        // Skip through to end tag.
        int eventType;
        while ((eventType = parser.next()) != XmlPullParser.END_DOCUMENT) {
            if (eventType == XmlPullParser.END_TAG) {
                if (parser.getName().equals(tagName)) {
                    name[0] = valueName;
                    //System.out.println("Returning value for " + valueName + ": " + res);
                    return res;
                }
                throw new XmlPullParserException("Unexpected end tag in <"
                        + tagName + ">: " + parser.getName());
            } else if (eventType == XmlPullParser.TEXT) {
                throw new XmlPullParserException("Unexpected text in <"
                        + tagName + ">: " + parser.getName());
            } else if (eventType == XmlPullParser.START_TAG) {
                throw new XmlPullParserException(
                        "Unexpected start tag in <" + tagName + ">: "
                                + parser.getName());
            }
        }
        throw new XmlPullParserException("Unexpected end of document in <"
                + tagName + ">");
    }

    /**
     * Read an int[] object from an XmlPullParser.  The XML data could
     * previously have been generated by writeIntArrayXml().  The XmlPullParser
     * must be positioned <em>after</em> the tag that begins the list.
     * 
     * @param parser The XmlPullParser from which to read the list data.
     * @param endTag Name of the tag that will end the list, usually "list".
     * @param name An array of one string, used to return the name attribute
     *             of the list's tag.
     * 
     * @return Returns a newly generated int[].
     * 
     * @see #readListXml
     */
    public static final int[] readThisIntArrayXml(XmlPullParser parser,
            String endTag, String[] name) throws XmlPullParserException,
            java.io.IOException {

        int num;
        try {
            num = Integer.parseInt(parser.getAttributeValue(null, "num"));
        } catch (NullPointerException e) {
            throw new XmlPullParserException(
                    "Need num attribute in byte-array");
        } catch (NumberFormatException e) {
            throw new XmlPullParserException(
                    "Not a number in num attribute in byte-array");
        }

        int[] array = new int[num];
        int i = 0;

        int eventType = parser.getEventType();
        do {
            if (eventType == XmlPullParser.START_TAG) {
                if (parser.getName().equals("item")) {
                    try {
                        array[i] = Integer.parseInt(parser
                                .getAttributeValue(null, "value"));
                    } catch (NullPointerException e) {
                        throw new XmlPullParserException(
                                "Need value attribute in item");
                    } catch (NumberFormatException e) {
                        throw new XmlPullParserException(
                                "Not a number in value attribute in item");
                    }
                } else {
                    throw new XmlPullParserException(
                            "Expected item tag at: " + parser.getName());
                }
            } else if (eventType == XmlPullParser.END_TAG) {
                if (parser.getName().equals(endTag)) {
                    return array;
                } else if (parser.getName().equals("item")) {
                    i++;
                } else {
                    throw new XmlPullParserException("Expected " + endTag
                            + " end tag at: " + parser.getName());
                }
            }
            eventType = parser.next();
        } while (eventType != XmlPullParser.END_DOCUMENT);

        throw new XmlPullParserException("Document ended before " + endTag
                + " end tag");
    }

    /**
     * Read a HashMap object from an XmlPullParser.  The XML data could
     * previously have been generated by writeMapXml().  The XmlPullParser
     * must be positioned <em>after</em> the tag that begins the map.
     * 
     * @param parser The XmlPullParser from which to read the map data.
     * @param endTag Name of the tag that will end the map, usually "map".
     * @param name An array of one string, used to return the name attribute
     *             of the map's tag.
     * 
     * @return HashMap The newly generated map.
     * 
     * @see #readMapXml
     */
    public static final HashMap<String, ?> readThisMapXml(
            XmlPullParser parser, String endTag, String[] name)
            throws XmlPullParserException, java.io.IOException {
        HashMap<String, Object> map = new HashMap<String, Object>();

        int eventType = parser.getEventType();
        do {
            if (eventType == XmlPullParser.START_TAG) {
                Object val = readThisValueXml(parser, name);
                if (name[0] != null) {
                    //System.out.println("Adding to map: " + name + " -> " + val);
                    map.put(name[0], val);
                } else {
                    throw new XmlPullParserException(
                            "Map value without name attribute: "
                                    + parser.getName());
                }
            } else if (eventType == XmlPullParser.END_TAG) {
                if (parser.getName().equals(endTag)) {
                    return map;
                }
                throw new XmlPullParserException("Expected " + endTag
                        + " end tag at: " + parser.getName());
            }
            eventType = parser.next();
        } while (eventType != XmlPullParser.END_DOCUMENT);

        throw new XmlPullParserException("Document ended before " + endTag
                + " end tag");
    }

    /**
     * Read an ArrayList object from an XmlPullParser.  The XML data could
     * previously have been generated by writeListXml().  The XmlPullParser
     * must be positioned <em>after</em> the tag that begins the list.
     * 
     * @param parser The XmlPullParser from which to read the list data.
     * @param endTag Name of the tag that will end the list, usually "list".
     * @param name An array of one string, used to return the name attribute
     *             of the list's tag.
     * 
     * @return HashMap The newly generated list.
     * 
     * @see #readListXml
     */
    public static final ArrayList<?> readThisListXml(XmlPullParser parser,
            String endTag, String[] name) throws XmlPullParserException,
            java.io.IOException {
        ArrayList<Object> list = new ArrayList<Object>();

        int eventType = parser.getEventType();
        do {
            if (eventType == XmlPullParser.START_TAG) {
                Object val = readThisValueXml(parser, name);
                list.add(val);
                //System.out.println("Adding to list: " + val);
            } else if (eventType == XmlPullParser.END_TAG) {
                if (parser.getName().equals(endTag)) {
                    return list;
                }
                throw new XmlPullParserException("Expected " + endTag
                        + " end tag at: " + parser.getName());
            }
            eventType = parser.next();
        } while (eventType != XmlPullParser.END_DOCUMENT);

        throw new XmlPullParserException("Document ended before " + endTag
                + " end tag");
    }
}

Related

1. readThisValueXml(XmlPullParser parser, String[] name)
2. readThisValueXml(XmlPullParser parser, String[] name)
3. readThisValueXml(XmlPullParser parser, String[] name)
4. readThisValueXml(XmlPullParser parser, String[] name)
5. readUriAttribute(XmlPullParser in, String name)
6. readValueXml(XmlPullParser parser, String[] name)
7. readValueXml(XmlPullParser parser, String[] name)
8. readValueXml(XmlPullParser parser, String[] name)
9. readValueXml(XmlPullParser parser, String[] name)