/**
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* 加载WMS,拼接FILTER,LAYERS参数等
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*/
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import MapConfig from '../../conf/MapConfig'
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function WfsHelper () {
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this.filters = []
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this.typeNames = []
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this.url = MapConfig.BLUEMAP_HOST + '/server/ogcserver/PipeLine/wfs'
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this.params = {
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REQUEST: 'getfeature',
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OUTPUTFORMAT: 'JSON',
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maxFeatures: 20000,
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version: '1.0.0'
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}
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this.addTypeName = (typeName) => {
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this.typeNames.push(typeName)
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}
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this.addEquals = (property, literal) => {
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var filter = '<PropertyIsEqualTo><PropertyName>' + property + '</PropertyName><Literal>' + literal + '</Literal></PropertyIsEqualTo>'
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this.filters.push(filter)
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}
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this.addLike = (property, literal) => {
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var filter = '<PropertyIsLike><PropertyName>' + property + '</PropertyName><Literal>*' + literal + '*</Literal></PropertyIsLike>'
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this.filters.push(filter)
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}
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/**
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* 得到filter参数值
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* @returns {string|null}
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*/
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this.getFilterParams = () => {
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var head = '<Filter xmlns="http://www.opengis.net/ogc">'
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var end = '</Filter>'
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var filter = ''
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if (this.filters.length > 0) {
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for (var i = 0; i < this.filters.length; i++) {
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filter += this.filters[i]
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}
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// 当条件数 > 1时，需要用and标签包裹
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if (this.filters.length > 1) {
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return ('FILTER=' + head + '<And>' + filter + '</And>' + end)
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}
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return ('FILTER=' + head + filter + end)
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}
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return null
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}
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this.getUrlParams = () => {
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var params = ''
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for (var p in this.params) {
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params += (p + '=' + this.params[p] + '&')
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}
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// 拼接typename参数
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params += 'typename=' + this.typeNames.join(',')
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// 拼接filter参数
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var filterParam = this.getFilterParams()
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if (filterParam) {
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params += '&' + filterParam
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}
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return encodeURI(params)
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}
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this.getUrl = () => {
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var url = this.url
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if (url.indexOf('?') > 0) {
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url += '&'
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} else {
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url += '?'
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}
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return url + this.getUrlParams()
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}
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}
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export default WfsHelper
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