implemented pagination and sorting for loans api

mifosng-provider/src/main/java/org/mifosplatform/portfolio/loanaccount/api/LoansApiResource.java

@@ -39,6 +39,7 @@ import org.mifosplatform.infrastructure.core.exception.UnrecognizedQueryParamExc
 import org.mifosplatform.infrastructure.core.serialization.ApiRequestJsonSerializationSettings;
 import org.mifosplatform.infrastructure.core.serialization.DefaultToApiJsonSerializer;
 import org.mifosplatform.infrastructure.core.serialization.FromJsonHelper;
+import org.mifosplatform.infrastructure.core.service.Page;
 import org.mifosplatform.infrastructure.security.service.PlatformSecurityContext;
 import org.mifosplatform.organisation.staff.data.BulkTransferLoanOfficerData;
 import org.mifosplatform.organisation.staff.data.StaffData;
@@ -357,6 +358,20 @@ public class LoansApiResource {
         return this.toApiJsonSerializer.serialize(settings, loanAccount, LOAN_DATA_PARAMETERS);
     }
 
+    @GET
+    @Consumes({ MediaType.APPLICATION_JSON })
+    @Produces({ MediaType.APPLICATION_JSON })
+    public String retrieveAll(@QueryParam("sqlSearch") final String sqlSearch, @QueryParam("externalId") final String externalId,
+            @QueryParam("underHierarchy") final String hierarchy, @QueryParam("offset") final Integer offset,
+            @QueryParam("limit") final Integer limit, @QueryParam("orderBy") final String orderBy,
+            @QueryParam("sortOrder") final String sortOrder) {
+
+        context.authenticatedUser().validateHasReadPermission(resourceNameForPermissions);
+        final Page<LoanAccountData> loanBasicDetails = this.loanReadPlatformService.retrieveAll(sqlSearch, externalId, offset, limit,
+                orderBy, sortOrder);
+        return this.toApiJsonSerializer.serialize(loanBasicDetails);
+    }
+    
     @POST
     @Consumes({ MediaType.APPLICATION_JSON })
     @Produces({ MediaType.APPLICATION_JSON })

mifosng-provider/src/main/java/org/mifosplatform/portfolio/loanaccount/service/LoanReadPlatformService.java

@@ -7,6 +7,7 @@ package org.mifosplatform.portfolio.loanaccount.service;
 
 import java.util.Collection;
 
+import org.mifosplatform.infrastructure.core.service.Page;
 import org.mifosplatform.portfolio.calendar.data.CalendarData;
 import org.mifosplatform.portfolio.loanaccount.data.LoanAccountData;
 import org.mifosplatform.portfolio.loanaccount.data.LoanTransactionData;
@@ -46,4 +47,6 @@ public interface LoanReadPlatformService {
     LoanAccountData retrieveGroupAndMembersDetailsTemplate(Long groupId);
 
     Collection<CalendarData> retrieveCalendars(Long groupId);
+
+    Page<LoanAccountData> retrieveAll(String sqlSearch, String externalId, Integer offset, Integer limit, String orderBy, String sortOrder);
 }

mifosng-provider/src/main/java/org/mifosplatform/portfolio/loanaccount/service/LoanReadPlatformServiceImpl.java

@@ -9,9 +9,11 @@ import java.math.BigDecimal;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
 
+import org.apache.commons.lang.StringUtils;
 import org.joda.time.Days;
 import org.joda.time.LocalDate;
 import org.mifosplatform.infrastructure.codes.data.CodeValueData;
@@ -19,6 +21,8 @@ import org.mifosplatform.infrastructure.codes.service.CodeValueReadPlatformServi
 import org.mifosplatform.infrastructure.core.data.EnumOptionData;
 import org.mifosplatform.infrastructure.core.domain.JdbcSupport;
 import org.mifosplatform.infrastructure.core.service.DateUtils;
+import org.mifosplatform.infrastructure.core.service.Page;
+import org.mifosplatform.infrastructure.core.service.PaginationHelper;
 import org.mifosplatform.infrastructure.core.service.TenantAwareRoutingDataSource;
 import org.mifosplatform.infrastructure.security.service.PlatformSecurityContext;
 import org.mifosplatform.organisation.monetary.data.CurrencyData;
@@ -87,6 +91,8 @@ public class LoanReadPlatformServiceImpl implements LoanReadPlatformService {
     private final CodeValueReadPlatformService codeValueReadPlatformService;
     private final CalendarReadPlatformService calendarReadPlatformService;
 
+    private final PaginationHelper<LoanAccountData> paginationHelper = new PaginationHelper<LoanAccountData>();
+    private final LoanMapper loaanLoanMapper = new LoanMapper();
 
     @Autowired
     public LoanReadPlatformServiceImpl(final PlatformSecurityContext context, final LoanRepository loanRepository,
@@ -165,6 +171,56 @@ public class LoanReadPlatformServiceImpl implements LoanReadPlatformService {
         }
     }
 
+    @Override
+    public Page<LoanAccountData> retrieveAll(final String sqlSearch, final String externalId, final Integer offset, final Integer limit,
+            final String orderBy, final String sortOrder) {
+
+        StringBuilder sqlBuilder = new StringBuilder(200);
+        sqlBuilder.append("select SQL_CALC_FOUND_ROWS ");
+        sqlBuilder.append(loaanLoanMapper.loanSchema());
+
+        final Object[] objectArray = new Object[1];
+        int arrayPos = 0;
+
+        String sqlQueryCriteria = sqlSearch;
+        if (StringUtils.isNotBlank(sqlQueryCriteria)) {
+            sqlQueryCriteria = sqlQueryCriteria.replaceAll("accountNo", "l.account_no");
+            sqlBuilder.append(" where (").append(sqlQueryCriteria).append(")");
+        }
+
+        if (StringUtils.isNotBlank(externalId)) {
+            sqlBuilder.append(" and l.external_id = ?");
+            objectArray[arrayPos] = externalId;
+            arrayPos = arrayPos + 1;
+        }
+
+        if (StringUtils.isNotBlank(orderBy)) {
+            sqlBuilder.append(" order by ").append(orderBy);
+            if (StringUtils.isNotBlank(sortOrder)) {
+                sqlBuilder.append(' ').append(sortOrder);
+            }
+        }
+
+        if (limit != null && limit > 0) {
+            Integer maxLimitAllowed = 200;
+            if (limit < maxLimitAllowed) {
+                maxLimitAllowed = limit;
+            }
+            sqlBuilder.append(" limit ").append(maxLimitAllowed);
+            if (offset != null) {
+                sqlBuilder.append(" offset ").append(offset);
+            }
+        } else if (limit != null && limit == -1) {
+            ;
+        } else
+            sqlBuilder.append(" limit ").append(200);
+
+        final Object[] finalObjectArray = Arrays.copyOf(objectArray, arrayPos);
+        final String sqlCountRows = "SELECT FOUND_ROWS()";
+        return this.paginationHelper.fetchPage(this.jdbcTemplate, sqlCountRows, sqlBuilder.toString(), finalObjectArray,
+                this.loaanLoanMapper);
+    }
+    
     @Override
     public LoanAccountData retrieveTemplateWithClientAndProductDetails(final Long clientId, final Long productId) {