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/hippo/src/main/webapp/ext/src/data/DataReader.js

http://hdbc.googlecode.com/
JavaScript | 160 lines | 76 code | 8 blank | 76 comment | 20 complexity | 865c37e9cc88a999d65a299cfd4c33d1 MD5 | raw file
  1/*!
  2 * Ext JS Library 3.0.0
  3 * Copyright(c) 2006-2009 Ext JS, LLC
  4 * licensing@extjs.com
  5 * http://www.extjs.com/license
  6 */
  7/**
  8 * @class Ext.data.DataReader
  9 * Abstract base class for reading structured data from a data source and converting
 10 * it into an object containing {@link Ext.data.Record} objects and metadata for use
 11 * by an {@link Ext.data.Store}.  This class is intended to be extended and should not
 12 * be created directly. For existing implementations, see {@link Ext.data.ArrayReader},
 13 * {@link Ext.data.JsonReader} and {@link Ext.data.XmlReader}.
 14 * @constructor Create a new DataReader
 15 * @param {Object} meta Metadata configuration options (implementation-specific).
 16 * @param {Array/Object} recordType
 17 * <p>Either an Array of {@link Ext.data.Field Field} definition objects (which
 18 * will be passed to {@link Ext.data.Record#create}, or a {@link Ext.data.Record Record}
 19 * constructor created using {@link Ext.data.Record#create}.</p>
 20 */
 21Ext.data.DataReader = function(meta, recordType){
 22    /**
 23     * This DataReader's configured metadata as passed to the constructor.
 24     * @type Mixed
 25     * @property meta
 26     */
 27    this.meta = meta;
 28    /**
 29     * @cfg {Array/Object} fields
 30     * <p>Either an Array of {@link Ext.data.Field Field} definition objects (which
 31     * will be passed to {@link Ext.data.Record#create}, or a {@link Ext.data.Record Record}
 32     * constructor created from {@link Ext.data.Record#create}.</p>
 33     */
 34    this.recordType = Ext.isArray(recordType) ?
 35        Ext.data.Record.create(recordType) : recordType;
 36};
 37
 38Ext.data.DataReader.prototype = {
 39
 40    /**
 41     * Abstract method, overridden in {@link Ext.data.JsonReader}
 42     */
 43    buildExtractors : Ext.emptyFn,
 44
 45    /**
 46     * Used for un-phantoming a record after a successful database insert.  Sets the records pk along with new data from server.
 47     * You <b>must</b> return at least the database pk using the idProperty defined in your DataReader configuration.  The incoming
 48     * data from server will be merged with the data in the local record.
 49     * In addition, you <b>must</b> return record-data from the server in the same order received.
 50     * Will perform a commit as well, un-marking dirty-fields.  Store's "update" event will be suppressed.
 51     * @param {Record/Record[]} record The phantom record to be realized.
 52     * @param {Object/Object[]} data The new record data to apply.  Must include the primary-key from database defined in idProperty field.
 53     */
 54    realize: function(rs, data){
 55        if (Ext.isArray(rs)) {
 56            for (var i = rs.length - 1; i >= 0; i--) {
 57                // recurse
 58                if (Ext.isArray(data)) {
 59                    this.realize(rs.splice(i,1).shift(), data.splice(i,1).shift());
 60                }
 61                else {
 62                    // weird...rs is an array but data isn't??  recurse but just send in the whole invalid data object.
 63                    // the else clause below will detect !this.isData and throw exception.
 64                    this.realize(rs.splice(i,1).shift(), data);
 65                }
 66            }
 67        }
 68        else {
 69            // If rs is NOT an array but data IS, see if data contains just 1 record.  If so extract it and carry on.
 70            if (Ext.isArray(data) && data.length == 1) {
 71                data = data.shift();
 72            }
 73            if (!this.isData(data)) {
 74                // TODO: Let exception-handler choose to commit or not rather than blindly rs.commit() here.
 75                //rs.commit();
 76                throw new Ext.data.DataReader.Error('realize', rs);
 77            }
 78            this.buildExtractors();
 79            var values = this.extractValues(data, rs.fields.items, rs.fields.items.length);
 80            rs.phantom = false; // <-- That's what it's all about
 81            rs._phid = rs.id;  // <-- copy phantom-id -> _phid, so we can remap in Store#onCreateRecords
 82            rs.id = data[this.meta.idProperty];
 83            rs.data = values;
 84            rs.commit();
 85        }
 86    },
 87
 88    /**
 89     * Used for updating a non-phantom or "real" record's data with fresh data from server after remote-save.
 90     * You <b>must</b> return a complete new record from the server.  If you don't, your local record's missing fields
 91     * will be populated with the default values specified in your Ext.data.Record.create specification.  Without a defaultValue,
 92     * local fields will be populated with empty string "".  So return your entire record's data after both remote create and update.
 93     * In addition, you <b>must</b> return record-data from the server in the same order received.
 94     * Will perform a commit as well, un-marking dirty-fields.  Store's "update" event will be suppressed as the record receives
 95     * a fresh new data-hash.
 96     * @param {Record/Record[]} rs
 97     * @param {Object/Object[]} data
 98     */
 99    update : function(rs, data) {
100        if (Ext.isArray(rs)) {
101            for (var i=rs.length-1; i >= 0; i--) {
102                if (Ext.isArray(data)) {
103                    this.update(rs.splice(i,1).shift(), data.splice(i,1).shift());
104                }
105                else {
106                    // weird...rs is an array but data isn't??  recurse but just send in the whole data object.
107                    // the else clause below will detect !this.isData and throw exception.
108                    this.update(rs.splice(i,1).shift(), data);
109                }
110            }
111        }
112        else {
113                     // If rs is NOT an array but data IS, see if data contains just 1 record.  If so extract it and carry on.
114            if (Ext.isArray(data) && data.length == 1) {
115                data = data.shift();
116            }
117            if (!this.isData(data)) {
118                // TODO: create custom Exception class to return record in thrown exception.  Allow exception-handler the choice
119                // to commit or not rather than blindly rs.commit() here.
120                rs.commit();
121                throw new Ext.data.DataReader.Error('update', rs);
122            }
123            this.buildExtractors();
124            rs.data = this.extractValues(Ext.apply(rs.data, data), rs.fields.items, rs.fields.items.length);
125            rs.commit();
126        }
127    },
128
129    /**
130     * Returns true if the supplied data-hash <b>looks</b> and quacks like data.  Checks to see if it has a key
131     * corresponding to idProperty defined in your DataReader config containing non-empty pk.
132     * @param {Object} data
133     * @return {Boolean}
134     */
135    isData : function(data) {
136        return (data && Ext.isObject(data) && !Ext.isEmpty(data[this.meta.idProperty])) ? true : false;
137    }
138};
139
140/**
141 * @class Ext.data.DataReader.Error
142 * @extends Ext.Error
143 * General error class for Ext.data.DataReader
144 */
145Ext.data.DataReader.Error = Ext.extend(Ext.Error, {
146    constructor : function(message, arg) {
147        this.arg = arg;
148        Ext.Error.call(this, message);
149    },
150    name: 'Ext.data.DataReader'
151});
152Ext.apply(Ext.data.DataReader.Error.prototype, {
153    lang : {
154        'update': "#update received invalid data from server.  Please see docs for DataReader#update and review your DataReader configuration.",
155        'realize': "#realize was called with invalid remote-data.  Please see the docs for DataReader#realize and review your DataReader configuration.",
156        'invalid-response': "#readResponse received an invalid response from the server."
157    }
158});
159
160