SimpleCriterion.java

/*******************************************************************************
 * Copyright (c) 2008 Marcelo Mayworm. All rights reserved. This
 * program and the accompanying materials are made available under the terms of
 * the Eclipse Public License v1.0 which accompanies this distribution, and is
 * available at http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors: 	Marcelo Mayworm - initial API and implementation
 *
 ******************************************************************************/
package org.eclipse.ecf.presence.search;

/**
 * 
 * Base class implementation of {@link ICriterion} for simple comparisons. Subclasses may be created as
 * appropriate.
 * @since 2.0
 */
public class SimpleCriterion implements ICriterion {

	protected final String field;
	protected final String value;
	protected final String operator;
	protected final boolean ignoreCase;

	/**
	 * Constructor for a instance of {@link ICriterion}
	 * @param field Name of the field
	 * @param value Value that match the search
	 * @param operator Operator opportune for the search 
	 * @param ignoreCase Consider case or not
	 */
	public SimpleCriterion(String field, String value, String operator, boolean ignoreCase) {
		this.field = field;
		this.value = value;
		this.operator = operator;
		this.ignoreCase = ignoreCase;
	}

	/**
	 * Constructor for a instance of {@link ICriterion}. This is 
	 * ignore case
	 * @param field Name of the field
	 * @param value Value that match the search
	 * @param operator Operator opportune for the search 
	 */
	public SimpleCriterion(String field, String value, String operator) {
		this.field = field;
		this.value = value;
		this.operator = operator;
		this.ignoreCase = false;
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ecf.presence.search.ICriterion#toExpression()
	 */
	public String toExpression() {
		return field + ' ' + operator + ' ' + value;
	}

	public String toString() {
		StringBuffer sb = new StringBuffer("SimpleCriterion["); //$NON-NLS-1$
		sb.append("field=").append(field).append(";"); //$NON-NLS-1$ //$NON-NLS-2$
		sb.append("value=").append(value).append(";"); //$NON-NLS-1$ //$NON-NLS-2$
		sb.append("operator=").append(operator).append(";"); //$NON-NLS-1$ //$NON-NLS-2$
		sb.append("ignoreCase=").append(ignoreCase).append("]"); //$NON-NLS-1$ //$NON-NLS-2$
		return sb.toString();
	}

	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (o instanceof String) {
			return o.equals(field);
		}
		return false;
	}

	public int hashCode() {
		return (field != null ? field.hashCode() : 0);
	}
}