org.ajax4jsf.ajax.repeat.SequenceDataModel Maven / Gradle / Ivy

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Ajax4jsf is an open source extension to the JavaServer Faces standard that adds AJAX capability to JSF applications without requiring the writing of any JavaScript.
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/**
 * 
 */
package org.ajax4jsf.ajax.repeat;

import java.io.IOException;

import javax.faces.context.FacesContext;
import javax.faces.model.DataModel;

/**
 * @author shura
 *
 */
public class SequenceDataModel extends ExtendedDataModel {
	
	DataModel wrapped;

	/**
	 * @param wrapped
	 */
	public SequenceDataModel(DataModel wrapped) {
		super();
		this.wrapped = wrapped;
	}

	/* (non-Javadoc)
	 * @see org.ajax4jsf.ajax.repeat.ExtendedDataModel#dataIterator(org.ajax4jsf.ajax.repeat.Range)
	 */
/*	public Iterator dataIterator(Range range) {
		final SequenceRange seqRange = (SequenceRange) range;
		int rows = seqRange.getRows();
		int rowCount = wrapped.getRowCount();
		final int firstRow = seqRange.getFirstRow();
		if(rows > 0){
			rows += firstRow;
			if(rowCount >=0){
				rows = Math.min(rows, rowCount);
			}
		} else if(rowCount >=0 ){
			rows = rowCount;
		} 
		final int maxRow = rows;
		return new Iterator(){
			
			int rowIndex = firstRow;

			public boolean hasNext() {
				// TODO Auto-generated method stub
				return maxRow < 0 || rowIndex < maxRow;
			}

			public Object next() {
				// TODO Auto-generated method stub
				return new Integer(rowIndex++);
			}

			public void remove() {
				throw new IllegalStateException();				
			}
			
		};
	}
*/	
	public void walk(FacesContext context, DataVisitor visitor, Range range, Object argument) throws IOException {
		final SequenceRange seqRange = (SequenceRange) range;
		int rows = seqRange.getRows();
		int rowCount = wrapped.getRowCount();
		int currentRow = seqRange.getFirstRow();
		if(rows > 0){
			rows += currentRow;
			if(rowCount >=0){
				rows = Math.min(rows, rowCount);
			}
		} else if(rowCount >=0 ){
			rows = rowCount;
		} else {
			rows = -1;
		}
		while (rows < 0 || currentRow < rows) {
			wrapped.setRowIndex(currentRow);
			if(wrapped.isRowAvailable()){
				visitor.process(context, new Integer(currentRow), argument);
			} else {
				break;
			}
			currentRow++;
		}
		
	}

	/* (non-Javadoc)
	 * @see org.ajax4jsf.ajax.repeat.ExtendedDataModel#getRowKey()
	 */
	public Object getRowKey() {
		int index = wrapped.getRowIndex();
		if(index<0){
			return null;
		}
		return new Integer(index);
	}

	/* (non-Javadoc)
	 * @see org.ajax4jsf.ajax.repeat.ExtendedDataModel#getSerializableModel(org.ajax4jsf.ajax.repeat.Range)
	 */
	public ExtendedDataModel getSerializableModel(Range range) {
		// By default data not serializable
		return null;
	}

	/* (non-Javadoc)
	 * @see org.ajax4jsf.ajax.repeat.ExtendedDataModel#setRowKey(java.lang.Object)
	 */
	public void setRowKey(Object key) {
		if(null == key){
			wrapped.setRowIndex(-1);
		} else {
			Integer index = (Integer) key;
			wrapped.setRowIndex(index.intValue());
		}
	}

	/* (non-Javadoc)
	 * @see javax.faces.model.DataModel#getRowCount()
	 */
	public int getRowCount() {
		// TODO Auto-generated method stub
		return wrapped.getRowCount();
	}

	/* (non-Javadoc)
	 * @see javax.faces.model.DataModel#getRowData()
	 */
	public Object getRowData() {
		// TODO Auto-generated method stub
		return wrapped.getRowData();
	}

	/* (non-Javadoc)
	 * @see javax.faces.model.DataModel#getRowIndex()
	 */
	public int getRowIndex() {
		// TODO Auto-generated method stub
		return wrapped.getRowIndex();
	}

	/* (non-Javadoc)
	 * @see javax.faces.model.DataModel#getWrappedData()
	 */
	public Object getWrappedData() {
		// TODO Auto-generated method stub
		return wrapped.getWrappedData();
	}

	/* (non-Javadoc)
	 * @see javax.faces.model.DataModel#isRowAvailable()
	 */
	public boolean isRowAvailable() {
		// TODO Auto-generated method stub
		return wrapped.isRowAvailable();
	}

	/* (non-Javadoc)
	 * @see javax.faces.model.DataModel#setRowIndex(int)
	 */
	public void setRowIndex(int rowIndex) {
		wrapped.setRowIndex(rowIndex);
	}

	/* (non-Javadoc)
	 * @see javax.faces.model.DataModel#setWrappedData(java.lang.Object)
	 */
	public void setWrappedData(Object data) {
		wrapped.setWrappedData(data);
	}

}