com.appglu.impl.CrudTemplate.java Source code

Introduction

Here is the source code for com.appglu.impl.CrudTemplate.java

Source

/*******************************************************************************
 * Copyright 2013 AppGlu, Inc.
 * 
 * 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.
 ******************************************************************************/
package com.appglu.impl;

import java.util.ArrayList;

import org.springframework.web.client.RestClientException;
import org.springframework.web.client.RestOperations;

import com.appglu.AppGluHttpNotFoundException;
import com.appglu.AppGluRestClientException;
import com.appglu.CrudOperations;
import com.appglu.ReadAllFilterArguments;
import com.appglu.Row;
import com.appglu.Rows;
import com.appglu.impl.json.RowBody;

public final class CrudTemplate implements CrudOperations {

    static final String CRUD_TABLE_URL = "/v1/tables/{table}";

    static final String CRUD_ENTITY_URL = "/v1/tables/{table}/{id}";

    private final RestOperations restOperations;

    public CrudTemplate(RestOperations restOperations) {
        this.restOperations = restOperations;
    }

    /**
     * {@inheritDoc}
     */
    public Object create(String tableName, Row row) throws AppGluRestClientException {
        try {
            RowBody primaryKey = this.restOperations.postForObject(CRUD_TABLE_URL, new RowBody(row), RowBody.class,
                    tableName);
            return this.extractPrimaryKeyValue(primaryKey.getRow());
        } catch (RestClientException e) {
            throw new AppGluRestClientException(e.getMessage(), e);
        }
    }

    private Object extractPrimaryKeyValue(Row primaryKey) {
        ArrayList<String> keySet = new ArrayList<String>(primaryKey.keySet());

        if (keySet.isEmpty()) {
            return null;
        }

        return primaryKey.get(keySet.get(0));
    }

    /**
     * {@inheritDoc}
     */
    public Row read(String tableName, Object id) throws AppGluRestClientException {
        return this.read(tableName, id, false);
    }

    /**
     * {@inheritDoc}
     */
    public Row read(String tableName, Object id, boolean expandRelationships) throws AppGluRestClientException {
        try {
            String url = CRUD_ENTITY_URL + ("?expand_relationships=" + expandRelationships);
            RowBody rowBody = this.restOperations.getForObject(url, RowBody.class, tableName, id);
            return rowBody.getRow();
        } catch (AppGluHttpNotFoundException e) {
            return null;
        } catch (RestClientException e) {
            throw new AppGluRestClientException(e.getMessage(), e);
        }
    }

    /**
     * {@inheritDoc}
     */
    public Rows readAll(String tableName) throws AppGluRestClientException {
        return this.readAll(tableName, false);
    }

    /**
     * {@inheritDoc}
     */
    public Rows readAll(String tableName, boolean expandRelationships) throws AppGluRestClientException {
        return this.readAll(tableName, expandRelationships, new ReadAllFilterArguments());
    }

    /**
     * {@inheritDoc}
     */
    public Rows readAll(String tableName, boolean expandRelationships, ReadAllFilterArguments arguments)
            throws AppGluRestClientException {
        try {
            String readAllUrl = this.buildReadAllUrl(expandRelationships, arguments);
            return this.restOperations.getForObject(readAllUrl, Rows.class, tableName);
        } catch (RestClientException e) {
            throw new AppGluRestClientException(e.getMessage(), e);
        }
    }

    private String buildReadAllUrl(boolean expandRelationships, ReadAllFilterArguments arguments) {
        StringBuilder url = new StringBuilder();

        url.append(CRUD_TABLE_URL);

        url.append("?");
        if (arguments.hasLimit()) {
            url.append("limit=" + arguments.getLimit());
            url.append("&");
        }
        if (arguments.hasOffset()) {
            url.append("offset=" + arguments.getOffset());
            url.append("&");
        }
        if (arguments.hasFilterColumn()) {
            url.append("filter_column=" + arguments.getFilterColumn());
            url.append("&");
        }
        if (arguments.hasFilterQuery()) {
            url.append("filter_query=" + arguments.getFilterQuery());
            url.append("&");
        }
        if (arguments.hasSortColumn()) {
            url.append("sort_column=" + arguments.getSortColumn());
            url.append("&");
        }
        if (arguments.hasSortDirection()) {
            url.append("sort_direction=" + arguments.getSortDirection());
            url.append("&");
        }
        url.append("expand_relationships=" + expandRelationships);

        return url.toString();
    }

    /**
     * {@inheritDoc}
     */
    public boolean update(String tableName, Object id, Row row) throws AppGluRestClientException {
        try {
            this.restOperations.put(CRUD_ENTITY_URL, new RowBody(row), tableName, id);
            return true;
        } catch (AppGluHttpNotFoundException e) {
            return false;
        } catch (RestClientException e) {
            throw new AppGluRestClientException(e.getMessage(), e);
        }
    }

    /**
     * {@inheritDoc}
     */
    public boolean delete(String tableName, Object id) throws AppGluRestClientException {
        try {
            this.restOperations.delete(CRUD_ENTITY_URL, tableName, id);
            return true;
        } catch (AppGluHttpNotFoundException e) {
            return false;
        } catch (RestClientException e) {
            throw new AppGluRestClientException(e.getMessage(), e);
        }
    }

}