JVector.java

/**
 * 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.
 */

package org.commoncrawl.rpc.compiler;

import java.io.IOException;

import org.commoncrawl.rpc.compiler.JCompType.CCompType;
import org.commoncrawl.rpc.compiler.JCompType.CppCompType;

/**
 */
public class JVector extends JCompType {
  
  static private int level = 0;
  
  static private String getId(String id) { return id+getLevel(); }
  
  static private String getLevel() { return Integer.toString(level); }
  
  static private void incrLevel() { level++; }
  
  static private void decrLevel() { level--; }
  
  private JType type;
  
  class JavaVector extends JavaCompType {
    
    private JType.JavaType element;
    
    JavaVector(JType.JavaType t) {
      super("java.util.ArrayList<"+t.getWrapperType()+">",
            "Vector", "java.util.ArrayList<"+t.getWrapperType()+">");
      element = t;
    }
    
    @Override
    boolean isIntrinsicType() {
      return false;
    }
    
    @Override
    void genReadMethod(CodeBuffer cb, String fname, String tag, boolean decl) {
      if (decl) {
        cb.append(getType()+" "+fname+";\n");
      }
      cb.append("{\n");
      incrLevel();
      cb.append("int "+getId("itemCount")+" = decoder.readInt(input);\n");
      cb.append(fname+"=new "+getType()+"();\n");
      cb.append("for (int "+getId("i") + "=0;"+getId("i")+"<"+getId("itemCount")+";++"+getId("i")+") {\n");
      element.genReadMethod(cb, getId("e"), getId("e"), true);
      cb.append(fname+".add("+getId("e")+");\n");
      cb.append("}\n");
      decrLevel();
      cb.append("}\n");
    }
    
    @Override
    void genSkipMethod(CodeBuffer cb) {
      cb.append("{\n");
      incrLevel();
      cb.append("int "+getId("itemCount")+" = decoder.readInt(input);\n");
      cb.append("for (int "+getId("i") + "=0;"+getId("i")+"<"+getId("itemCount")+";++"+getId("i")+") {\n");
      element.genSkipMethod(cb);
      cb.append("}\n");
      decrLevel();
      cb.append("}\n");
    }     
    
    @Override
    void genWriteMethod(CodeBuffer cb, String fname, String tag) {
      cb.append("{\n");
      incrLevel();

      cb.append("int "+getId("len")+" = "+fname+".size();\n");
      cb.append("encoder.writeInt(output,"+getId("len")+");\n");
      cb.append("for(int "+getId("vidx")+" = 0; "+getId("vidx")+"<"+getId("len")+"; "+getId("vidx")+"++) {\n");
      cb.append(element.getType()+" "+getId("e")+" = "+fname+".get("+getId("vidx")+");\n");
      element.genWriteMethod(cb, getId("e"), getId("e"));
      cb.append("}\n");
      cb.append("}\n");
      decrLevel();
    }
    
    @Override
    void genJSON(CodeBuffer cb, String fname) throws IOException {
      cb.append("writer.name(\""+fname+"\").beginArray();\n");
      cb.append("for(int "+getId("vidx")+" = 0; "+getId("vidx")+"<"+fname+".size();"+getId("vidx")+"++) {\n");
      cb.append("writer.value(");
      if (element.isIntrinsicType())
        cb.append(fname+".get("+getId("vidx")+"));\n");
      else 
        cb.append(fname+".get("+getId("vidx")+").toString());\n");
      cb.append("}\n");
      cb.append("writer.endArray();\n");
    }
    
    
    @Override
    void genClearMethod(CodeBuffer cb, String fname) { 
  	  	//TODO: IS THIS THE MOST EFFICIENT WAY TO CLEAR A STRING 
    	cb.append(fname+".clear();\n");
    }
    
    @Override
    void genClone(CodeBuffer cb,String type, String targetField, String sourceField) {
    	genMergeOrClone(true, cb, type, targetField, sourceField);
    }
    
    @Override
    void genMerge(CodeBuffer cb,String type, String targetField, String sourceField) {
    	genMergeOrClone(false, cb, type, targetField, sourceField);
    }

    private final void genMergeOrClone(boolean isClone,CodeBuffer cb,String type, String targetField, String sourceField) {
    	
    	cb.append("//Deep Copy Vector\n");
    	
    	if (isClone) { 
    		cb.append(targetField+" = new "+"java.util.ArrayList<"+ element.getWrapperType() + ">();\n");
    	}

    	cb.append("int "+getId("len")+" = "+sourceField+".size();\n");

    	cb.append("for(int "+getId("vidx")+" = 0; "+getId("vidx")+"<"+getId("len")+"; "+getId("vidx")+"++) {\n");
    	// get the next entry ... 
    	cb.append(element.getType()+" "+getId("src")+" = "+sourceField+".get("+getId("vidx")+");\n");
    	// declare copied value 
    	cb.append(element.getType()+" "+getId("tgt")+";\n");

    	// and clone the new element ...
    	element.genClone(cb,element.getType(), getId("tgt"), getId("src"));

    	// and add the new entry to new vector ...  
    	cb.append(targetField + ".add("+getId("tgt")+");\n");
    	cb.append("}\n");
    }
    
    void genValidFieldCheck(CodeBuffer cb,String fieldName) { 
      cb.append("if ("+fieldName+".size() != 0)");
    }
    
    /** does this type have an idependent dirty state  - ignores validFields bit**/
    boolean hasDirtyState() { 
      return true;
    }
    
    void genDirtyCheck(CodeBuffer cb,String fieldName) { 
      cb.append("if (!isDirty){\n");
      cb.append("isDirty="+fieldName+".size() !=0;\n");
      cb.append("}\n");
    }    
    
  }
  
  /** Creates a new instance of JVector */
  public JVector(JType t) {
    type = t;
    setJavaType(new JavaVector(t.getJavaType()));
    setCppType(new CppCompType(" ::std::vector<"+t.getCppType().getType()+">"));
    setCType(new CCompType());
  }
  
  String getSignature() {
    return "[" + type.getSignature() + "]";
  }
}