/*
* Copyright 2013 Bazaarvoice, 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.bazaarvoice.jolt.chainr;
import com.bazaarvoice.jolt.Chainr;
import com.bazaarvoice.jolt.JoltTransform;
import com.bazaarvoice.jolt.chainr.instantiator.ChainrInstantiator;
import com.bazaarvoice.jolt.chainr.instantiator.DefaultChainrInstantiator;
import com.bazaarvoice.jolt.chainr.spec.ChainrEntry;
import com.bazaarvoice.jolt.chainr.spec.ChainrSpec;
import java.util.ArrayList;
import java.util.List;
public class ChainrBuilder {
protected ChainrSpec chainrSpec;
protected ChainrInstantiator chainrInstantiator = new DefaultChainrInstantiator();
/**
* Initialize a Chainr to run a list of Transforms.
* This is the constructor most "production" usages of Chainr should use.
*
* @param chainrSpecObj List of transforms to run
*/
public ChainrBuilder( Object chainrSpecObj ) {
this.chainrSpec = new ChainrSpec( chainrSpecObj );
}
/**
* Set a ChainrInstantiator to use when instantiating Transform Objects.
* If one is not set, defaults to DefaultChainrInstantiator;
*
* @param loader ChainrInstantiator to use load Transforms
*/
public ChainrBuilder loader( ChainrInstantiator loader ) {
if ( loader == null ) {
throw new IllegalArgumentException( "ChainrBuilder requires a non-null loader." );
}
this.chainrInstantiator = loader;
return this;
}
public Chainr build() {
List<JoltTransform> transforms = new ArrayList<JoltTransform>( chainrSpec.getChainrEntries().size() );
for ( ChainrEntry entry : chainrSpec.getChainrEntries() ) {
JoltTransform transform = chainrInstantiator.hydrateTransform( entry );
transforms.add( transform );
}
return new Chainr( transforms );
}
}