src/app/reporting/detail/queryParams/input/input.component.ts

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 {Component, forwardRef, Input, OnDestroy, OnInit} from '@angular/core';
import {Type} from '../../../../services/reporting/domain/type.model';
import {
  AbstractControl,
  ControlValueAccessor,
  FormControl,
  NG_VALIDATORS,
  NG_VALUE_ACCESSOR,
  ValidationErrors,
  Validator,
  Validators
} from '@angular/forms';
import {Subscription} from 'rxjs/Subscription';
import {AbstractControlValueAccessor} from '../abstract-value-accessor';
import {Operator} from '../../../../services/reporting/domain/query-parameter.model';
import {createPlaceholder} from '../query-params.helper';

const OperatorPrefixMap = {
  'EQUALS': 'equals',
  'LIKE': 'contains',
  'GREATER': 'is greater than',
  'LESSER': 'is lesser than'
};

export const REPORTING_EQUALS_PARAM_CONTROL_VALUE_ACCESSOR: any = {
  provide: NG_VALUE_ACCESSOR,
  useExisting: forwardRef(() => ReportingInputParamComponent),
  multi: true,
};

export const REPORTING_INPUT_PARAM_VALIDATOR: any = {
  provide: NG_VALIDATORS,
  useExisting: forwardRef(() => ReportingInputParamComponent),
  multi: true,
};

@Component({
  providers: [ REPORTING_EQUALS_PARAM_CONTROL_VALUE_ACCESSOR, REPORTING_INPUT_PARAM_VALIDATOR ],
  templateUrl: './input.component.html'
})
export class ReportingInputParamComponent extends AbstractControlValueAccessor
  implements ControlValueAccessor, Validator, OnInit, OnDestroy {

  private changeSubscription: Subscription;

  formControl: FormControl;

  @Input() label: string;

  @Input() required: boolean;

  @Input() type: Type;

  @Input() operator: Operator;

  constructor() {
    super();
  }

  ngOnInit(): void {
    this.formControl = new FormControl([], this.required ? [Validators.required] : []);

    this.changeSubscription = this.formControl.valueChanges
      .subscribe(value => this.value = value);
  }

  ngOnDestroy(): void {
    this.changeSubscription.unsubscribe();
  }

  validate(c: AbstractControl): ValidationErrors {
    return this.formControl.errors;
  }

  get placeholder(): string {
    return createPlaceholder(this.label, this.required);
  }

  get prefix(): string {
    return OperatorPrefixMap[this.operator];
  }
}