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/*
* Copyright 2013-2014 Richard M. Hightower
* 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.
*
* __________ _____ __ .__
* \______ \ ____ ____ ____ /\ / \ _____ | | _|__| ____ ____
* | | _// _ \ / _ \ / \ \/ / \ / \\__ \ | |/ / |/ \ / ___\
* | | ( <_> | <_> ) | \ /\ / Y \/ __ \| <| | | \/ /_/ >
* |______ /\____/ \____/|___| / \/ \____|__ (____ /__|_ \__|___| /\___ /
* \/ \/ \/ \/ \/ \//_____/
* ____. ___________ _____ ______________.___.
* | |____ ___ _______ \_ _____/ / _ \ / _____/\__ | |
* | \__ \\ \/ /\__ \ | __)_ / /_\ \ \_____ \ / | |
* /\__| |/ __ \\ / / __ \_ | \/ | \/ \ \____ |
* \________(____ /\_/ (____ / /_______ /\____|__ /_______ / / ______|
* \/ \/ \/ \/ \/ \/
*/
package org.boon.criteria;
import org.boon.core.Function;
import org.boon.core.reflection.BeanUtils;
import org.boon.core.reflection.fields.FieldAccess;
import org.boon.template.Template;
import java.util.*;
import static org.boon.Lists.list;
import static org.boon.Boon.joinBy;
public abstract class Selector {
/**
* Performs collections from the results.
* @param selectors list of selectors
* @param results results we are selecting from
* @return map of selected items per row
*/
public static void collectFrom(List selectors, Collection results) {
if (results.size() == 0) {
return;
}
Map fields = BeanUtils.getFieldsFromObject(results.iterator().next());
collectFrom(selectors, results, fields);
}
/**
* Performs collections from the results.
* @param selectors list of selectors
* @param results results we are selecting from
* @param fields fields
* @return map of selected items per row
*/
public static void collectFrom(List selectors, Collection results, Map fields) {
for ( Selector s : selectors ) {
s.handleStart( results );
}
int index = 0;
for ( Object item : results ) {
for ( Selector s : selectors ) {
s.handleRow( index, null, item, fields );
}
index++;
}
for ( Selector s : selectors ) {
s.handleComplete( null );
}
}
/**
* Performs the actual selection from the results.
* @param selectors list of selectors
* @param results results we are selecting from
* @param - List of items
* @return map of selected items per row
*/
public static
- List
> selectFrom(List selectors, Collection- results) {
if (results.size() == 0) {
return Collections.EMPTY_LIST;
}
Map
fields = BeanUtils.getFieldsFromObject(results.iterator().next());
return selectFrom(selectors, results, fields);
}
/**
* Performs the actual selection from the results.
* @param selectors list of selectors
* @param results results we are selecting from
* @param fields fields
* @param - List of items
* @return map of selected items per row
*/
public static
- List
> selectFrom(List selectors, Collection- results, Map
fields) {
List> rows = new ArrayList<>( results.size() );
for ( Selector s : selectors ) {
s.handleStart( results );
}
int index = 0;
for ( ITEM item : results ) {
Map row = new LinkedHashMap<>();
for ( Selector s : selectors ) {
s.handleRow( index, row, item, fields );
}
index++;
rows.add( row );
}
for ( Selector s : selectors ) {
s.handleComplete( rows );
}
return rows;
}
/** Create a list of selectors.
*
* @param selects array of selectors
* @return
*/
public static List selects( Selector... selects ) {
return list( selects );
}
protected String name;
protected String alias;
protected final boolean path;
/**
* Is this a property path?
* @param prop property
* @return true or false
*/
private static boolean isPropPath(String prop) {
return BeanUtils.isPropPath(prop);
}
/**
* Default constructor.
*/
public Selector() {
path = false;
}
/**
*
* @param nameOrPath name of property path
*
* @param alias alias of property path
*/
public Selector( String nameOrPath, String alias ) {
name = nameOrPath;
this.alias = alias == null ? nameOrPath : alias;
path = isPropPath(name);
}
/**
*
* @param nameOrPath name of property path
*
*/
public Selector( String nameOrPath ) {
name = nameOrPath;
alias = name;
path = isPropPath(name);
}
public String getName() {
return name;
}
protected void getPropertyValueAndPutIntoRow(Map row, Object item, Map fields) {
if (!path && fields!=null) {
row.put( this.alias, fields.get( this.name ).getValue( item ) );
} else {
row.put( this.alias, BeanUtils.atIndex(item, name) );
}
}
protected Object getPropertyValue(Object item, Map fields) {
if (!path && fields!=null ) {
return fields.get( this.name ).getValue( item );
} else {
return BeanUtils.atIndex(item, name);
}
}
/**
* Allows you to select a property or property path.
* @param propName name of property or property path
* @return returns a Selector
*/
public static Selector select( final String propName ) {
return new Selector( propName, propName ) {
@Override
public void handleRow( int index, Map row,
Object item, Map fields ) {
getPropertyValueAndPutIntoRow(row, item, fields);
}
@Override
public void handleStart( Collection results ) {
}
@Override
public void handleComplete( List> rows ) {
}
};
}
/**
* Selects but allows having a different alias for the output.
* @param propName name of property or property path to select
* @param alias name that the value will be selected as.
* @return selector
*/
public static Selector selectAs( final String propName, final String alias ) {
return new Selector( propName, alias ) {
@Override
public void handleRow( int index, Map row,
Object item, Map fields ) {
getPropertyValueAndPutIntoRow(row, item, fields);
}
@Override
public void handleStart( Collection results ) {
}
@Override
public void handleComplete( List> rows ) {
}
};
}
/**
* Selects but allows having a different alias for the output.
* @param propName name of property or property path to select
* @param alias name that the value will be selected as.
* @param transform Function that allows you to convert from an object into another object
* @return selector
* */
public static Selector selectAs( final String propName, final String alias,
final Function transform) {
return new Selector( propName, alias ) {
@Override
public void handleRow( int index, Map row,
Object item, Map fields ) {
if (!path && fields!=null) {
row.put( this.name, transform.apply(fields.get( this.name ).getValue( item )) );
} else {
row.put( alias, transform.apply(BeanUtils.atIndex( item, propName )) );
}
}
@Override
public void handleStart( Collection results ) {
}
@Override
public void handleComplete( List> rows ) {
}
};
}
/**
* Selects but allows having a different alias for the output.
\ * @param alias name that the value will be selected as.
* @param transform Function that allows you to convert from an object into another object
* @return selector
* */
public static Selector selectAsTemplate( final String alias,
final String template,
final Template transform) {
return new Selector( alias, alias ) {
@Override
public void handleRow( int index, Map row,
Object item, Map fields ) {
if (!path && fields!=null) {
row.put( this.name, transform.replace(template, item) );
} else {
row.put( alias, transform.replace(template, item) );
}
}
@Override
public void handleStart( Collection results ) {
}
@Override
public void handleComplete( List> rows ) {
}
};
}
public static Selector toStr( final String name ) {
return new Selector( name + ".toString()", null ) {
@Override
public void handleRow( int index, Map row, Object item, Map fields ) {
Object selected = fields.get( this.name ).getValue( item );
row.put( this.name, selected == null ? "" : selected.toString() );
}
@Override
public void handleStart( Collection results ) {
}
@Override
public void handleComplete( List> rows ) {
}
};
}
public static Selector toStr() {
return new Selector( "toString()", null ) {
@Override
public void handleRow( int index, Map row, Object item, Map fields ) {
row.put( this.name, item.toString() );
}
@Override
public void handleStart( Collection results ) {
}
@Override
public void handleComplete( List> rows ) {
}
};
}
@Deprecated
public static Selector select( final String... ppath ) {
return new Selector( joinBy( '.', ppath ), null ) {
int index = 0;
@Override
public void handleRow( int rowNum, Map row,
Object item, Map fields ) {
Object o = BeanUtils.getPropByPath( item, ppath );
row.put( this.name, o );
}
@Override
public void handleStart( Collection results ) {
}
@Override
public void handleComplete( List> rows ) {
}
};
}
@Deprecated
public static Selector toStr( final String... ppath ) {
return new Selector( joinBy( '.', ppath ) + ".toString()", null ) {
int index = 0;
@Override
public void handleRow( int rowNum, Map row,
Object item, Map fields ) {
Object o = BeanUtils.getPropByPath( item, ppath );
row.put( this.name, o == null ? "" : o.toString() );
}
@Override
public void handleStart( Collection results ) {
}
@Override
public void handleComplete( List> rows ) {
}
};
}
@Deprecated
public static Selector selectPropPath( final String... ppath ) {
return new Selector( joinBy( '.', ppath ), null ) {
@Override
public void handleRow( int rowNum, Map row,
Object item, Map fields ) {
Object o = BeanUtils.getPropByPath( item, ppath );
row.put( this.name, o );
}
@Override
public void handleStart( Collection results ) {
}
@Override
public void handleComplete( List> rows ) {
}
};
}
/**
* Just grabs the index of the result set.
* @return
*/
public static Selector rowId() {
return new Selector( "rowId", null ) {
@Override
public void handleRow( int index, Map row, Object item, Map fields ) {
row.put( name, index );
}
@Override
public void handleStart( Collection results ) {
}
@Override
public void handleComplete( List> rows ) {
}
};
}
public abstract void handleRow( int index, Map row,
Object item,
Map fields );
public abstract void handleStart( Collection results );
public abstract void handleComplete( List> rows );
public String getAlias() {
return alias;
}
}