Method.java

/*
 * Copyright (c) 2009-2012 Panxiaobo
 * 
 * Licensed 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 com.googlecode.dex2jar;

import java.util.Arrays;

/**
 * represent a method_id_item in dex file format
 * 
 * @author <a href="mailto:pxb1988@gmail.com">Panxiaobo</a>
 * @version $Rev$
 */
public class Method {
    /**
     * descriptor of the method, this will build after {@link #getDesc()}.
     */
    private String desc;
    /**
     * name of the method.
     */
    private String name;
    /**
     * owner class of the method, in TypeDescriptor format.
     */
    private String owner;
    /**
     * parameter types of the method, in TypeDescriptor format.
     */
    private String[] parameterTypes;

    /**
     * return type of the method, in TypeDescriptor format.
     */
    private String returnType;

    public Method(String owner, String name, String[] parameterTypes, String returnType) {
        this.owner = owner;
        this.name = name;
        this.parameterTypes = parameterTypes;
        this.returnType = returnType;
    }

    public String getDesc() {
        if (desc == null) {
            StringBuilder ps = new StringBuilder("(");
            if (parameterTypes != null) {
                for (String t : parameterTypes) {
                    ps.append(t);
                }
            }
            ps.append(")").append(returnType);
            desc = ps.toString();
        }
        return desc;
    }

    /**
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * @return the owner
     */
    public String getOwner() {
        return owner;
    }

    /**
     * @return the parameterTypes
     */
    public String[] getParameterTypes() {
        return parameterTypes;
    }

    public String getReturnType() {
        return returnType;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        result = prime * result + ((owner == null) ? 0 : owner.hashCode());
        result = prime * result + Arrays.hashCode(parameterTypes);
        result = prime * result + ((returnType == null) ? 0 : returnType.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        Method other = (Method) obj;
        if (name == null) {
            if (other.name != null) {
                return false;
            }
        } else if (!name.equals(other.name)) {
            return false;
        }
        if (owner == null) {
            if (other.owner != null) {
                return false;
            }
        } else if (!owner.equals(other.owner)) {
            return false;
        }
        if (!Arrays.equals(parameterTypes, other.parameterTypes)) {
            return false;
        }
        if (returnType == null) {
            if (other.returnType != null) {
                return false;
            }
        } else if (!returnType.equals(other.returnType)) {
            return false;
        }
        return true;
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        return this.getOwner() + "." + this.getName() + this.getDesc();
    }
}