//------------------------------------------------------------------------------
// Copyright (c) 2005, 2007 IBM Corporation and others.
// 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:
// IBM Corporation - initial implementation
//------------------------------------------------------------------------------
package org.eclipse.epf.diagram.wpdd.providers;

import java.text.MessageFormat;
import java.text.ParsePosition;

import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.emf.ecore.EDataType;
import org.eclipse.emf.ecore.EEnum;
import org.eclipse.emf.ecore.EEnumLiteral;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.gmf.runtime.common.core.command.ICommand;
import org.eclipse.gmf.runtime.common.core.command.UnexecutableCommand;
import org.eclipse.gmf.runtime.common.ui.services.parser.IParser;
import org.eclipse.gmf.runtime.common.ui.services.parser.IParserEditStatus;
import org.eclipse.gmf.runtime.common.ui.services.parser.ParserEditStatus;
import org.eclipse.gmf.runtime.emf.type.core.commands.SetValueCommand;
import org.eclipse.gmf.runtime.emf.type.core.requests.SetRequest;
import org.eclipse.jface.text.contentassist.IContentAssistProcessor;
import org.eclipse.epf.diagram.wpdd.part.WPDDiagramEditorPlugin;

/**
 * @generated
 */
public abstract class DiagramAbstractParser implements IParser {

	/**
	 * @generated
	 */
	private String viewPattern;

	/**
	 * @generated
	 */
	private MessageFormat viewProcessor;

	/**
	 * @generated
	 */
	private String editPattern;

	/**
	 * @generated
	 */
	private MessageFormat editProcessor;

	/**
	 * @generated
	 */
	public String getViewPattern() {
		return viewPattern;
	}

	/**
	 * @generated
	 */
	protected MessageFormat getViewProcessor() {
		return viewProcessor;
	}

	/**
	 * @generated
	 */
	public void setViewPattern(String viewPattern) {
		this.viewPattern = viewPattern;
		viewProcessor = createViewProcessor(viewPattern);
	}

	/**
	 * @generated
	 */
	protected MessageFormat createViewProcessor(String viewPattern) {
		return new MessageFormat(viewPattern);
	}

	/**
	 * @generated
	 */
	public String getEditPattern() {
		return editPattern;
	}

	/**
	 * @generated
	 */
	protected MessageFormat getEditProcessor() {
		return editProcessor;
	}

	/**
	 * @generated
	 */
	public void setEditPattern(String editPattern) {
		this.editPattern = editPattern;
		editProcessor = createEditProcessor(editPattern);
	}

	/**
	 * @generated
	 */
	protected MessageFormat createEditProcessor(String editPattern) {
		return new MessageFormat(editPattern);
	}

	/**
	 * @generated
	 */
	public String getPrintString(IAdaptable adapter, int flags) {
		return getStringByPattern(adapter, flags, getViewPattern(),
				getViewProcessor());
	}

	/**
	 * @generated
	 */
	public String getEditString(IAdaptable adapter, int flags) {
		return getStringByPattern(adapter, flags, getEditPattern(),
				getEditProcessor());
	}

	/**
	 * @generated
	 */
	protected abstract String getStringByPattern(IAdaptable adapter, int flags,
			String pattern, MessageFormat processor);

	/**
	 * @generated
	 */
	public IParserEditStatus isValidEditString(IAdaptable element,
			String editString) {
		ParsePosition pos = new ParsePosition(0);
		Object[] values = getEditProcessor().parse(editString, pos);
		if (values == null) {
			return new ParserEditStatus(WPDDiagramEditorPlugin.ID,
					IParserEditStatus.UNEDITABLE, "Invalid input at "
							+ pos.getErrorIndex());
		}
		return validateNewValues(values);
	}

	/**
	 * @generated
	 */
	protected IParserEditStatus validateNewValues(Object[] values) {
		return ParserEditStatus.EDITABLE_STATUS;
	}

	/**
	 * @generated
	 */
	public ICommand getParseCommand(IAdaptable adapter, String newString,
			int flags) {
		Object[] values = getEditProcessor().parse(newString,
				new ParsePosition(0));
		if (values == null
				|| validateNewValues(values).getCode() != IParserEditStatus.EDITABLE) {
			return UnexecutableCommand.INSTANCE;
		}
		return getParseCommand(adapter, values);
	}

	/**
	 * @generated
	 */
	protected abstract ICommand getParseCommand(IAdaptable adapter,
			Object[] values);

	/**
	 * @generated
	 */
	public IContentAssistProcessor getCompletionProcessor(IAdaptable element) {
		return null;
	}

	/**
	 * @generated
	 */
	protected ICommand getModificationCommand(EObject element,
			EStructuralFeature feature, Object value) {
		value = getValidNewValue(feature, value);
		if (value instanceof InvalidValue) {
			return UnexecutableCommand.INSTANCE;
		}
		SetRequest request = new SetRequest(element, feature, value);
		return new SetValueCommand(request);
	}

	/**
	 * @generated
	 */
	protected Object getValidValue(EStructuralFeature feature, Object value) {
		EClassifier type = feature.getEType();
		if (type instanceof EDataType) {
			Class iClass = type.getInstanceClass();
			if (String.class.equals(iClass)) {
				if (value == null) {
					value = ""; //$NON-NLS-1$
				}
			}
		}
		return value;
	}

	/**
	 * @generated
	 */
	protected Object getValidNewValue(EStructuralFeature feature, Object value) {
		EClassifier type = feature.getEType();
		if (type instanceof EDataType) {
			Class iClass = type.getInstanceClass();
			if (Boolean.TYPE.equals(iClass)) {
				if (value instanceof Boolean) {
					// ok
				} else if (value instanceof String) {
					value = Boolean.valueOf((String) value);
				} else {
					value = new InvalidValue(
							"Value of type Boolean is expected");
				}
			} else if (Character.TYPE.equals(iClass)) {
				if (value instanceof Character) {
					// ok
				} else if (value instanceof String) {
					String s = (String) value;
					if (s.length() == 0) {
						value = null;
					} else {
						value = new Character(s.charAt(0));
					}
				} else {
					value = new InvalidValue(
							"Value of type Character is expected");
				}
			} else if (Byte.TYPE.equals(iClass)) {
				if (value instanceof Byte) {
					// ok
				} else if (value instanceof Number) {
					value = new Byte(((Number) value).byteValue());
				} else if (value instanceof String) {
					String s = (String) value;
					if (s.length() == 0) {
						value = null;
					} else {
						try {
							value = Byte.valueOf(s);
						} catch (NumberFormatException nfe) {
							value = new InvalidValue(
									"String value does not convert to Byte value");
						}
					}
				} else {
					value = new InvalidValue("Value of type Byte is expected");
				}
			} else if (Short.TYPE.equals(iClass)) {
				if (value instanceof Short) {
					// ok
				} else if (value instanceof Number) {
					value = new Short(((Number) value).shortValue());
				} else if (value instanceof String) {
					String s = (String) value;
					if (s.length() == 0) {
						value = null;
					} else {
						try {
							value = Short.valueOf(s);
						} catch (NumberFormatException nfe) {
							value = new InvalidValue(
									"String value does not convert to Short value");
						}
					}
				} else {
					value = new InvalidValue("Value of type Short is expected");
				}
			} else if (Integer.TYPE.equals(iClass)) {
				if (value instanceof Integer) {
					// ok
				} else if (value instanceof Number) {
					value = new Integer(((Number) value).intValue());
				} else if (value instanceof String) {
					String s = (String) value;
					if (s.length() == 0) {
						value = null;
					} else {
						try {
							value = Integer.valueOf(s);
						} catch (NumberFormatException nfe) {
							value = new InvalidValue(
									"String value does not convert to Integer value");
						}
					}
				} else {
					value = new InvalidValue(
							"Value of type Integer is expected");
				}
			} else if (Long.TYPE.equals(iClass)) {
				if (value instanceof Long) {
					// ok
				} else if (value instanceof Number) {
					value = new Long(((Number) value).longValue());
				} else if (value instanceof String) {
					String s = (String) value;
					if (s.length() == 0) {
						value = null;
					} else {
						try {
							value = Long.valueOf(s);
						} catch (NumberFormatException nfe) {
							value = new InvalidValue(
									"String value does not convert to Long value");
						}
					}
				} else {
					value = new InvalidValue("Value of type Long is expected");
				}
			} else if (Float.TYPE.equals(iClass)) {
				if (value instanceof Float) {
					// ok
				} else if (value instanceof Number) {
					value = new Float(((Number) value).floatValue());
				} else if (value instanceof String) {
					String s = (String) value;
					if (s.length() == 0) {
						value = null;
					} else {
						try {
							value = Float.valueOf(s);
						} catch (NumberFormatException nfe) {
							value = new InvalidValue(
									"String value does not convert to Float value");
						}
					}
				} else {
					value = new InvalidValue("Value of type Float is expected");
				}
			} else if (Double.TYPE.equals(iClass)) {
				if (value instanceof Double) {
					// ok
				} else if (value instanceof Number) {
					value = new Double(((Number) value).doubleValue());
				} else if (value instanceof String) {
					String s = (String) value;
					if (s.length() == 0) {
						value = null;
					} else {
						try {
							value = Double.valueOf(s);
						} catch (NumberFormatException nfe) {
							value = new InvalidValue(
									"String value does not convert to Double value");
						}
					}
				} else {
					value = new InvalidValue("Value of type Double is expected");
				}
			} else if (type instanceof EEnum) {
				if (value instanceof String) {
					EEnumLiteral literal = ((EEnum) type)
							.getEEnumLiteralByLiteral((String) value);
					if (literal == null) {
						value = new InvalidValue("Unknown literal: " + value);
					} else {
						value = literal.getInstance();
					}
				} else {
					value = new InvalidValue("Value of type String is expected");
				}
			}
		}
		return value;
	}

	/**
	 * @generated
	 */
	protected class InvalidValue {

		private String description;

		public InvalidValue(String description) {
			this.description = description;
		}

		public String toString() {
			return description;
		}
	}
}