/*******************************************************************************
 * Copyright (c) 2000, 2006 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 API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.debug.core.breakpoints;


import java.util.Map;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRunnable;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jdt.debug.core.IJavaMethodEntryBreakpoint;
import org.eclipse.jdt.internal.debug.core.model.JDIDebugTarget;
import com.sun.jdi.ClassType;
import com.sun.jdi.Location;
import com.sun.jdi.Method;
import com.sun.jdi.ReferenceType;
import com.sun.jdi.request.BreakpointRequest;
import com.sun.jdi.request.EventRequest;

/**
 * A line breakpoint at the first executable location in a specific method.
 */

public class JavaMethodEntryBreakpoint extends JavaLineBreakpoint implements IJavaMethodEntryBreakpoint {
	
	protected static final String JAVA_METHOD_ENTRY_BREAKPOINT = "org.eclipse.jdt.debug.javaMethodEntryBreakpointMarker"; //$NON-NLS-1$
	
	/**
	 * Breakpoint attribute storing the name of the method
	 * in which a breakpoint is contained.
	 * (value <code>"org.eclipse.jdt.debug.core.methodName"</code>). This attribute is a <code>String</code>.
	 */
	private static final String METHOD_NAME = "org.eclipse.jdt.debug.core.methodName"; //$NON-NLS-1$	
	
	/**
	 * Breakpoint attribute storing the signature of the method
	 * in which a breakpoint is contained.
	 * (value <code>"org.eclipse.jdt.debug.core.methodSignature"</code>). This attribute is a <code>String</code>.
	 */
	private static final String METHOD_SIGNATURE = "org.eclipse.jdt.debug.core.methodSignature"; //$NON-NLS-1$	
				
	/**
	 * Cache of method name attribute
	 */
	private String fMethodName = null;
	
	/**
	 * Cache of method signature attribute
	 */
	private String fMethodSignature = null;
		
	/**
	 * Constructs a new unconfigured method breakpoint
	 */
	public JavaMethodEntryBreakpoint() {
	}
	
	public JavaMethodEntryBreakpoint(final IResource resource, final String typeName, final String methodName, final String methodSignature, final int lineNumber, final int charStart, final int charEnd, final int hitCount, final boolean register, final Map attributes) throws CoreException {
		IWorkspaceRunnable wr= new IWorkspaceRunnable() {
			public void run(IProgressMonitor monitor) throws CoreException {
				// create the marker
				setMarker(resource.createMarker(JAVA_METHOD_ENTRY_BREAKPOINT));
				
				// add attributes
				addLineBreakpointAttributes(attributes, getModelIdentifier(), true, lineNumber, charStart, charEnd);
				addMethodNameAndSignature(attributes, methodName, methodSignature);
				addTypeNameAndHitCount(attributes, typeName, hitCount);
				//set attributes
				attributes.put(SUSPEND_POLICY, new Integer(getDefaultSuspendPolicy()));
				ensureMarker().setAttributes(attributes);
				
				register(register);
			}

		};
		run(getMarkerRule(resource), wr);
	}
		
	/**
	 * Adds the method name and signature attributes to the
	 * given attribute map, and intializes the local cache
	 * of method name and signature.
	 */
	private void addMethodNameAndSignature(Map attributes, String methodName, String methodSignature) {
		if (methodName != null) {		
			attributes.put(METHOD_NAME, methodName);
		}
		if (methodSignature != null) {
			attributes.put(METHOD_SIGNATURE, methodSignature);
		}
		fMethodName= methodName;
		fMethodSignature= methodSignature;
	}
				
	/**
	 * @see IJavaMethodEntryBreakpoint#getMethodName()		
	 */
	public String getMethodName() {
		return fMethodName;
	}
	
	/**
	 * @see IJavaMethodEntryBreakpoint#getMethodSignature()		
	 */
	public String getMethodSignature() {
		return fMethodSignature;
	}		
				
	/**
	 * Initialize cache of attributes
	 * 
	 * @see IBreakpoint#setMarker(IMarker)
	 */
	public void setMarker(IMarker marker) throws CoreException {
		super.setMarker(marker);
		fMethodName = marker.getAttribute(METHOD_NAME, null);
		fMethodSignature = marker.getAttribute(METHOD_SIGNATURE, null);		
	}	
	
	/**
	 * @see IJavaLineBreakpoint#supportsCondition()
	 */
	public boolean supportsCondition() {
		return false;
	}
		
	/**
	 * @see JavaBreakpoint#newRequests(JDIDebugTarget, ReferenceType)
	 */
	protected EventRequest[] newRequests(JDIDebugTarget target, ReferenceType type) throws CoreException {
		try {
			if (type instanceof ClassType) {
				ClassType clazz = (ClassType)type;
				Method method = clazz.concreteMethodByName(getMethodName(), getMethodSignature());
				if (method == null) {
					return null;
				}
				Location location = method.location();
				if (location == null || location.codeIndex() == -1) {
					return null;
				}
				BreakpointRequest req = type.virtualMachine().eventRequestManager().createBreakpointRequest(location);
				configureRequest(req, target);
				return new EventRequest[]{req};
			}
			return null;
		} catch (RuntimeException e) {
            target.internalError(e);
			return null;
		}
	}
}